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Monti, Diego. "Analisi del funzionamento dei dispositivi di isolamento sismico e applicazione progettuale ad un edificio in cemento armato." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8105/.
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La tesi ha l'obiettivo di studiare la tecnica di controllo passivo dell'isolamento sismico, comprenderne il funzionamento e applicarla ad un caso di studio (nello specifico un fabbricato ad uso civile abitazione costituito da 7 piani fuori terra) svolgendo le verifiche previste dal D.M. 14/01/08 e dalla Circolare 02/02/2009-
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Togninelli, Gianluca. "Isolamento alla base di un edificio residenziale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1678/.
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L’isolamento alla base è una tecnica grazie alla quale una struttura è protetta dagli effetti di danneggiamento dei terremoti grazie all’istallazione alla base della struttura di elementi flessibili che aumentano il periodo fondamentale della struttura fino ad un valore sufficientemente lontano dal periodo dominante del sisma atteso, oppure grazie ad elementi scorrevoli che entrano in funzione quando i carichi laterali superano un livello predefinito. In questo modo, le deformazioni indotte da un sisma si ritroveranno principalmente al livello di questi elementi flessibili o scorrevoli e la struttura si muoverà essenzialmente come un corpo rigido.
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Griffiths, David John. "Developmemt of High Speed High Dynamic Range Videography." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74990.
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High speed video has been a significant tool for unraveling the quantitative and qualitative assessment of phenomena that is too fast to readily observe. It was first used in 1852 by William Henry Fox Talbot to settle a dispute with reference to the synchronous position of a horse's hooves while galloping. Since that time private industry, government, and enthusiasts have been measuring dynamic scenarios with high speed video. One challenge that faces the high speed video community is the dynamic range of the sensors. The dynamic range of the sensor is constrained to the bit depth of the analog to digital converter, the deep well capacity of the sensor site, and baseline noise. A typical high speed camera can span a 60 dB dynamic range, 1000:1, natively. More recently the dynamic range has been extended to about 80 dB utilizing different pixel acquisition methods.
In this dissertation a method to extend the dynamic range will be presented and demonstrated to extend the dynamic range of a high speed camera system to over 170 dB, about 31,000,000:1. The proposed formation methodology is adaptable to any camera combination, and almost any needed dynamic range. The dramatic increase in the dynamic range is made possible through an adaptation of the current high dynamic range image formation methodologies. Due to the high cost of a high speed camera, a minimum number of cameras are desired to form a high dynamic range high speed video system. With a reduced number of cameras spanning a significant range, the errors on the formation process compound significantly relative to a normal high dynamic range image. The increase in uncertainty is created from the lack of relevant correlated information for final image formation, necessitating the development of a new formation methodology.
In the proceeding text the problem statement and background information will be reviewed in depth. The development of a new weighting function, stochastic image formation process, tone map methodology, and optimized multi camera design will be presented. The proposed methodologies' effectiveness will be compared to current methods throughout the text and a final demonstration will be presented.Ph. D.
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Burgisser, Alain. "HDR." Habilitation à diriger des recherches, Université d'Orléans, 2009. http://tel.archives-ouvertes.fr/tel-00447580.
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La Volcanologie moderne utilise des approches expérimentales, de terrain et théoriques pour mieux comprendre des phénomènes volcaniques critiques. Ces différents angles sont nécessaires en raison de l'extrême variation des échelles impliquées : des bulles de gaz de moins d'un millimètre libérant le gaz générant des panaches explosifs de plusieurs kilomètres de haut. La physique multiphasée, qui a pour objet d'étude l'écoulement de mixtures réactives de fluide et de particules, a permis des avancées dans l'unification de ces échelles. En combinant des lois à petite échelle, comme la croissance d'une bulle, des propriétés nouvelles émergent des simulations numériques, comme la ségrégation des bulles dans un conduit volcanique. De telles propriétés émergentes sont souvent valides à de grandes échelles et peuvent parfois être testées dans les systèmes naturels. La physique multiphasée reste cependant très jeune: les expérimentalistes qui déterminent les lois constitutives des systèmes les plus simples, les modélisateurs qui assemblent ces lois dans des modèles numériques complexes aux propriétés émergentes et les volcanologues de terrain qui mesures ces propriétés n'ont pas toujours le langage commun permettant de confronter leurs découvertes. Mes travaux ont eu pour but de trouver ce langage commun afin de faciliter l'intégration de nos connaissances sur les volcans. Cette intégration, renforcée dans le futur, pourrait ouvrir la possibilité d'unification de ces sous domaines. Allons-nous vers une unification de la Volcanologie ?
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Kremer, Laurent. "HDR." Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2007. http://tel.archives-ouvertes.fr/tel-00259336.
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Fernlund, Fredrik, and Markus Koskinen. "HDR in production." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95329.
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HDR (High Dynamic Range) är en teknik som gör det möjligt att fånga in ett större dynamiskt omfång en vad en vanlig bild skulle klara av. Användningsområdena för sådana HDR-bilder är många men företag inom mspel- och film- och visualiseringsindustrin använder ofta bilderna för virtuell ljussättning, däribland Syndicate Entertainment. Det är ett filmproduktionsbolag beläget i Stockholm där examensarbetet delvis är utfört. Idén bakom examensarbetet är att den komplicerade och långsamma processen att skapa HDR-bilderna bör kunna effektiviseras. En utförd enkätundersökning ligger tillsammans med litteraturstudier och kontakt med handledare på företaget och skolan som grund för en framtagen arbetsgång. Arbetsgången är den kedja av processer som krävs för att skapa en HDR-bild och vidare en ljusmapp. Denna arbetsgång granskas kritiskt där förslag på förbättringar redovisas. Förutom granskningen har en demonstrationsapplikation utvecklats. Det finns två syften med denna applikation. Syftena är dels att tillgodose företagets önskemål om att erhålla en applikation som går att använda i praktiken, dels för att realisera och testa några av de framtagna effektiviseringsteorierna.
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Vančura, Jan. "Tone-mapping HDR obrazů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2010. http://www.nusl.cz/ntk/nusl-237159.
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This thesis concerns with the introduction to the problematics of images with high dynamic range (HDR) and possibilities of HDR images compression options for display on devices with a low dynamic range (LDR). In the introduction is described historical evolution of recording of reality. It is focusing towards point of view of physics, human visual perception and digital recording. There are described the ways of generating and holding of HDR images. The thesis is corncerned to the techniques of HDR compression, it means the tone-mapping. The different techniques of tone-mapping are explained and specific aproach is targeted to the gradient domain high dynamic range compresion.
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Bonnard, Jennifer. "Génération d'images 3D HDR." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS014/document.
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L’imagerie HDR et l’imagerie 3D sont deux domaines dont l’évolution simultanée mais indépendante n’a cessé de croître ces dernières années. D’une part, l’imagerie HDR (High Dynamic Range) permet d’étendre la gamme dynamique de couleur des images conventionnelles dites LDR (Low Dynamic Range). D’autre part, l’imagerie 3D propose une immersion dans le film projeté avec cette impression de faire partie de la scène tournée. Depuis peu, ces deux domaines sont conjugués pour proposer des images ou vidéos 3D HDR mais peu de solutions viables existent et aucune n’est accessible au grand public. Dans ce travail de thèse, nous proposons une méthode de génération d’images 3D HDR pour une visualisation sur écrans autostéréoscopiques en adaptant une caméra multi-points de vue à l’acquisition d’expositions multiples. Pour cela, des filtres à densité neutre sont fixés sur les objectifs de la caméra. Ensuite, un appareillement des pixels homologues permet l’agrégation des pixels représentant le même point dans la scène acquise. Finalement, l’attribution d’une valeur de radiance est calculée pour chaque pixel du jeud’images considéré par moyenne pondérée des valeurs LDR des pixels homologues. Une étape supplémentaire est nécessaire car certains pixels ont une radiance erronée. Nous proposons une méthode basée surla couleur des pixels voisins puis deux méthodes basées sur la correction de la disparité des pixels dontla radiance est erronée. La première est basée sur la disparité des pixels du voisinage et la seconde sur la disparité calculée indépendamment sur chaque composante couleur. Ce pipeline permet la générationd’une image HDR par point de vue. Un algorithme de tone-mapping est ensuite appliqué à chacune d’elles afin qu’elles puissent être composées avec les filtres correspondants à l’écran autostéréoscopique considéré pour permettre la visualisation de l’image 3D HDRHDR imaging and 3D imaging are two areas in which the simultaneous but separate development has been growing in recent years. On the one hand, HDR (High Dynamic Range) imaging allows to extend the dynamic range of traditionnal images called LDR (Low Dynamic Range). On the other hand, 3Dimaging offers immersion in the shown film with the feeling to be part of the acquired scene. Recently, these two areas have been combined to provide 3D HDR images or videos but few viable solutions existand none of them is available to the public. In this thesis, we propose a method to generate 3D HDR images for autostereoscopic displays by adapting a multi-viewpoints camera to several exposures acquisition.To do that, neutral density filters are fixed on the objectives of the camera. Then, pixel matchingis applied to aggregate pixels that represent the same point in the acquired scene. Finally, radiance is calculated for each pixel of the set of images by using a weighted average of LDR values. An additiona lstep is necessary because some pixels have wrong radiance. We proposed a method based on the color of adjacent pixels and two methods based on the correction of the disparity of those pixels. The first method is based on the disparity of pixels of the neighborhood and the second method on the disparity independently calculated on each color channel. This pipeline allows the generation of 3D HDR image son each viewpoint. A tone-mapping algorithm is then applied on each of these images. Their composition with filters corresponding to the autostereoscopic screen used allows the visualization of the generated 3DHDR image
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Orndorff, Tim, Amit Puri, Mike Smiley, and John Connell. "Application of a High Data Rate Modem (HDRM)." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606209.
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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, CaliforniaA traditional Receiver, Modulator, Bit Synchronizer, Frame Synchronizer and Front-End Processor (FEP) with local RAID storage from numerous satellite ground station equipment providers is typically used to satisfy current needs in mission ground stations. The development of Software Defined Radios (SDRs) with reprogrammable personalities has led to the consolidation of these processing elements, and will become the standard for years to follow. CVG-Avtec Systems, Inc. has been a pioneer in the SDR industry, integrating several ground station functions into a one system solution. Its High Data Rate Modem (HDRM) architecture replaces racks of previous generation equipment, providing greater functionality in a smaller footprint. The Field Programmable Gate Array (FPGA) based HDRM is a one system solution that inputs Intermediate Frequency (IF) data and outputs packetized data over IP for data distribution. These new architectures are capitalizing on the revolution in electronics and networking technologies. This paper will discuss the architecture of the HDRM and how it optimizes ground station data processing in a high-rate environment.
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Holm, Åsa. "Mathematical Optimization of HDR Brachytherapy." Doctoral thesis, Linköpings universitet, Optimeringslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-99795.
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One out of eight deaths throughout the world is due to cancer. Developing new treatments and improving existing treatments is hence of major importance. In this thesis we have studied how mathematical optimization can be used to improve an existing treatment method: high-dose-rate (HDR) brachytherapy. HDR brachytherapy is a radiation modality used to treat tumours of for example the cervix, prostate, breasts, and skin. In HDR brachytherapy catheters are implanted into or close to the tumour volume. A radioactive source is moved through the catheters, and by adjusting where the catheters are placed, called catheter positioning, and how the source is moved through the catheters, called the dwelling time pattern, the dose distribution can be controlled. By constructing an individualized catheter positioning and dwelling time pattern, called dose plan, based on each patient's anatomy, it is possible to improve the treatment result. Mathematical optimization has during the last decade been used to aid in creating individualized dose plans. The dominating optimization model for this purpose is a linear penalty model. This model only considers the dwelling time pattern within already implanted catheters, and minimizes a weighted deviation from dose intervals prescribed by a physician. In this thesis we show that the distribution of the basic variables in the linear penalty model implies that only dwelling time patterns that have certain characteristics can be optimal. These characteristics cause troublesome inhomogeneities in the plans, and although various measures for mitigating these are already available, it is of fundamental interest to understand their cause. We have also shown that the relationship between the objective function of the linear penalty model and the measures commonly used for evaluating the quality of the dose distribution is weak. This implies that even if the model is solved to optimality there is no guarantee that the generated plan is optimal with respect to clinically relevant objectives, or even near-optimal. We have therefore constructed a new model for optimizing the dwelling time pattern. This model approximates the quality measures by the concept conditional value-at-risk, and we show that the relationship between our new model and the quality measures is strong. Furthermore, the new model generates dwelling time patterns that yield high-quality dose distributions. Combining optimization of the dwelling time pattern with optimization of the catheter positioning yields a problem for which it is rarely possible to find a proven optimal solution within a reasonable time frame. We have therefore developed a variable neighbourhood search heuristic that outperforms a state-of-the-art optimization software (CPLEX). We have also developed a tailored branch-and-bound algorithm that is better at improving the dual bound than a general branch-and-bound algorithm. This is a step towards the development of a method that can find proven optimal solutions to the combined problem within a reasonable time frame.
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Ferretti, Davide. "Immagini HDR: Principi e applicazioni." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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Questa tesi presenta il mondo delle immagini HDR, soffermandosi sulla descrizione dei principi su cui si basa la loro formazione via hardware e sulla loro generazione tramite software, fino ad arrivare a descrivere alcuni formati di file che permettono il salvataggio ed una serie di applicazioni che ne richiedono l’utilizzo in situazioni pratiche
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Musil, Martin. "HDR obrazy a jejich zpracování." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236195.
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HDR images have much wider range of luminance values, than photographs created and displayed in a standard 24-bit format. There are several ways to create images with high dynamic range, but this diploma thesis focuses just on one of them, and it is the method of composing out of series of standard photographs. The goal of the first part of the text consists of studying, understanding and eventually writing down the basic terms and knowledge in the subject of image composition and other processes, necessary to create HDR photographs. Next the procedure of creating images with high dynamic range, processing and converting them into viewable form, is described. The following chapter contains the design of the application, which creates this kind of photographs, and which is smoothly changing into its actual implementation afterwards. The process of experimenting and its results are presented and discussed firstly in their own chapter and secondly in the attachment. The conclusion contains the summary of the work and the options of possible expansion.
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Nejezchleb, Ivan. "Tone-mapping pro HDR obrazy." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2009. http://www.nusl.cz/ntk/nusl-236674.
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This thesis focuses on the high dynamic range (HDR) imaging problematic. It describes process of capturing and storage of HDR images in brief. Main part of thesis deals with techniques of how to display HDR images on common visual display devices, which are not able to represent them directly. This process is called tone-mapping. It is firstly described in general and than the text focuses on several techniques of tone-mapping, mainly on tone-mapping using bilateral filtering.
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Müllerová, Věra. "Kompenzace obrazových artefaktů v HDR obrazu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-264942.
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Tato diplomová práce se zabývá syntézou HDR obrazu (High Dynamic Range Imaging). HDRI technologie se stala v posledních letech velice populární. Běžný a nejvíce používaný způsob vytvoření HDR obrazu je spojení více snímků stejné scény pořízených pomocí různých expozičních časů. Tato technika funguje správně pouze v případě, že se jedná o statickou scénu. Pokud je však ve scéně nějaký pohyb ve chvíli, kdy se pořizují snímky dané scény, výsledný HDR obraz obsahuje artefakty zvané jako duchy. V této práci jsou prezentovány základní informace o HDRI se zaměřením na metody odstraňující artefakty z HDR obrazů. Práce shrnuje již existující metody a dvě z nich - tzv. bitmap movement detection a histogram based ghost detection - představuje jako vhodné pro použití v real-time skládání HDR obrazu a pro implementaci na FPGA (Field-Programmable Gate Array) architektuře. Tyto metody jsou v práci implementovány v programovacím jazyce C++ jako prototypy. Navíc je zde navržena modifikace metody založené na výpočtu histogramu pro jednodušší a efektivnější implementaci na FPGA architektuře.
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Kolkman-Deurloo, Inger Karine Kirsten. "Intraoperative HDR brachytherapy: present and future." [S.l.] : Rotterdam : [The Author] ; Erasmus University [Host], 2007. http://hdl.handle.net/1765/8621.
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Leonce, Andrew. "HDR video enhancement, processing and coding." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19639.
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Advances in digital camera technology have led to the development of image sensors that are capable of capturing High Dynamic Range (HDR) images. Although this has enabled the capture of greater depths of colour and illumination, there remain problems with regards to transmitting and displaying the HDR image data. Current consumer level displays are designed to only show images with a depth of 8-bits per pixel per channel. Typical HDR images can be 10-bits per pixel per channel and upwards, leading to the first problem, how to display HDR images on Standard Dynamic Range (SDR) displays. This is linked to a further problem, that of transmitting the HDR data to the SDR devices, due to the fact that most state-of-the-art image and video coding standards deal with only SDR data. Further, as with most technologies of this kind, current HDR displays are extremely expensive. Furthermore, media broadcast organisations have invested significant sums of money into their current architecture and are unwilling to completely change their systems at further cost.
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Martinů, Lukáš. "Skládání HDR obrazu pro pohyblivou scénu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234925.
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Master's thesis is focused on capturing of low dynamic range images using common devices such as camera and its multiple exposure. The main part of thesis is dedicated to composing these images to HDR image, inclusive sequence of images of static scenes, but also dynamic ones. Next part describes tone mapping used for display HDR image on LDR monitors. Moreover, there is given design and implementation of application solving problems mentioned earlier. In the end, the implemented application is evaluated and the possible continuation of this work is stated.
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Svatý, Lukáš. "HDR video "plugin" pro Adobe Premier." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-264960.
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Cílem práce je vytvoření podpory pro editovaní videa v HDR formátu. Pro editaci videa je zvolen program Adobe Premiere Pro a na dosažení požadovaného výsledku je vytvořen plugin do zmiňovaného softwaru, který poskytuje požadovanou funkcionalitu. V práci jsou vysvětleny principy vytváření, zobrazení a ukládáni obsahu z rozšíreným dynamickým rozsahem. Zároveň jsou vysvětleny principy vytváření pluginů pro Adobe Premiere Pro za pomoci SDK verze CS6. V praktické části této práce jsou vysvětleny detaily implementace, problémy, které byly řešené, a popis samotného pluginu. Návrh pluginů je vytvořen tak, aby byla možná další práce na tomto softwaru, přidaní další funkcionality a pro umožnění využití tohoto díla na rozvoji obsahu s rozšíreným dynamickým rozsahem.
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Staněk, Jiří. "Metody temporálního tone-mappingu HDR videa." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-403155.
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The diploma thesis provides the theoretical background needed to understand the complex topic of high dynamic range, and deals with the implementation of an innovative method for temporal video tone-mapping. At first, high dynamic range image acquisition, storage and processing are described. Afterwards, a general introduction to tone-mapping, description of undesirable image artifacts and an overview of existing state-of-the-art algorithms are presented. The part which follows focuses on the implementation of the chosen method and proposes several additional enhancements of the initially selected algorithm. Based on the information provided, an application with an intuitive graphical interface, which can be used for temporal HDR video tone-mapping, has been created. Finally, the the achieved results are demonstrated and visually compared with existing methods for temporal video tone-mapping.
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Larsson, Kristian, and Michael Larsson. "HDR och Tone mapping i automatiserade tullsystem." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Data- och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21715.
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This report is about how HDR (HighDynamicRange) can be created and used in combination with Tone mapping. This work has been carried out together with Kapsch TrafficCom AB in Jönköping. The objective of this project is to: Evaluate and investigate the effects given to pictures by HDR and tone mapping. Evaluate if the technology may lead to improvements in Kapsch’s systems. To construct a program which is able to handle some form of tone mapping or HDR-algorithm. These questions will be answered in this report: What kind of effects has HDR and tone mapping-algorithms on pictures? Can the HDR-technology give better data in Kapsch’s systems? The research method used in this report is called action research. This means the authors has investigated the technology by reading different documentations and by testing different algorithms to see what kind of result they give. The report describes some of the tests made to see if the technology is appropriate in Kapsch’s system.There is two smaller reports made by the authors which documenting some of the work.The first report describes the work with different settings for a camera to create pictures with HDR-quality. The second report describes the differences between tone mapping-algorithms and different file format. Both reports are included as appendices to this report.In the program created by the authors some larger library’s with standard functions for opening of JPEG-pictures was used. The chosen library’s was MFC and GDI+. The program is developed for a windows environment and handles functions like sharpening with unsharp mask, colour space conversion and tone mapping.
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Björk, Sebastian. "HDR and its influence on visual components." Thesis, Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70525.
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The purpose of this thesis was to analyse and compare HDR to SDR in relation to the visual components which exists in a picture. The questions asked how big of an impact HDR would have on the visual components in a picture. HDR simulated images of the same scene was analysed based on the visual component to compare in what ways they would be altered. The definition of a visual component is based on Bruce Blocks book The Visual Story. The result of the analysis exposed that HDR alters the current visual components and its sub components. Another conclusion was that the method used has it flaws and would need more research, the complication being the hardware needed to properly view HDR content.Syftet med detta examensarbete var att analysera och jämföra HDR mot SDR i relation till de visuella komponenter som finns i en bild. Frågan som ställdes var hur stor inverkan HDR har på bildens visuella komponenter. HDR-simulerade bilder från samma miljö analyserades baserat på de visuella komponenter för att se hur de ändrades. Defintionen av vad som räknas som en visuell komponent kommer från Bruce Blocks bok The Visual Story. Resultatet av analysen var att HDR förändrar de nuvarande komponenterna och underkomponenter. En till slutsats var att metoden har sina svagheter och skulle behöva studeras mer ingående, svårigheterna är att ett specifikt hårdvarustöd krävs för att kunna visa HDR korrekt.
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Ouallet, Anne. "- Parcours, HDR, vol. 1, août 2012 - Encadrements et mobilisations dans les villes africaines du patrimoine : l'exemple du religieux, HDR, vol. 2, août 2012 - Recueil de publications, HDR, vol. 3, août 2012." Habilitation à diriger des recherches, Aix-Marseille Université, 2013. http://tel.archives-ouvertes.fr/tel-00927081.
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Volume 2 : Encadrements et mobilisations dans les villes africaines du patrimoine : l'exemple du religieux Ce volume principal de l'HDR commence par la présentation des contextes conceptuels et du cadre méthodologique d'une recherche qui s'effectue sur les terrains africains de villes à fort potentiel patrimonial et à forte identité religieuse. Il réinterroge les cadres de l'action publique entendue dans une acception large et les bases des fonctionnements sociaux et spatiaux en observant les logiques et les recompositions autour du religieux. Il montre comment au Mali l'islam devient progressivement un encadrement englobant. Les analyses sont essentiellement réalisées à partir de terrains maliens et secondairement d'exemples éthiopiens. Le travail s'inscrit dans une démarche de géographie sociale mettant en avant les différents encadrements et les mobilisations autour de ce religieux.
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Ma, Mung Emmanuel. "Autonomie, migrations et altérité. HDR de géographie, 1999." Habilitation à diriger des recherches, Université de Poitiers, 1999. http://tel.archives-ouvertes.fr/tel-00337679.
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La 1ère partie cherche à définir un sens et un point de vue de l'autonomie à partir de la relecture de mes propres travaux. L'autonomie s'exprime dans la pratique par un savoir-faire comme capacité de distinction et de différenciation du sujet et de constitution d'un monde propre, et par un pouvoir-faire comme capacité d'affirmation et d'initiative du sujet et de transformation de ce monde. L'autonomie se manifeste dans différentes situations que la 2ème partie décline, depuis la société des hautes steppes tunisiennes aux migrants maghrébins ou d'origine chinoise et aux diasporas, et depuis la résistance à l'Etat et la conservation de soi à l'auto-organisation et l'affirmation de collectifs. L'autonomie comme définition de soi (du sujet, individuel ou collectif) s'élabore dans une relation à l'altérité sociale (autrui) et matérielle, relation dont l'inscription spatiale est difficile à problématiser. La 3ème partie est un essai sur l'espace géographique conçu comme médiation entre l'espace phénoménologique et l'espace cosmique à travers une poétique de l'image et selon des procédures qui en permettent la refiguration. Les nominations ordinaires de l'espace que sont les déictiques « ici », « là-bas » et « ailleurs » traduisent sur le plan de l'expérience personnelle des extases de l'espace. L'espace géographique en tant que représentation est-il organisé au travers d'un langage « non verbal » ? On en vient ensuite à l'idée selon laquelle il n'y a pas de réel préexistant mais une création mutuelle, une co-construction du sujet et de l'objet qui s'exprime dans le sens que le sujet humain, en tant qu'être vivant organisant sa reproduction, donne à l'espace géographique, à la terre humaine : un réceptacle prédisposé à l'accueillir.
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Levén, Lina. "Integrating HDR with a Real-Time Graphics Engine." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97124.
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This report covers the work on integrating HDR rendering in the existing Digital Arts graphics engine and in this case the HDR rendering will come to use mainly in architectural visualization. The basics of the HDR concept is covered and the use of HDR in real-time applications is motivated and the pros and cons of different image formats are considered. The necessity of a suitable tone mapping operator is taken into account and the tone mapping operator used is the one described in the paper Perceptual Effects in Real Time Tone Mapping by Krawczyk et al and the implementation of it is considered.
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Jedlička, Jan. "Uživatelské rozhraní systému pro práci s HDR obrazem." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-449172.
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The goal of this thesis is to improve graphical user interface of Tone Mapping Studio(TMS) program. This program is being developed on the Faculty of Information Technology(FIT), Brno University of Technology (BUT) by doc. Ing. Martin Čadík, PhD. The current program is using framework Qt3 , which is old and not compatible with modern libraries. This program has to be rewritten to support current version Qt5. I will analyze other programs in the area of working with High Dynamic Range (HDR) images and video. Changes for improving the interface will be proposed and UX tests will be done. Second part will consist of comparing plug-ins for converting images to grayscale that already exists in TMS.
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Svoboda, Pavel. "Návrh těsnění HDR HCČ 317 v JE Paks." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228604.
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This diploma work is engaged in replacement of gasket main dividing plane of reactor coolant pumps in nuclear power plant Paks. Of the newly suggested gasket is kammprofile gasket with expanded graphite layer. This work contain suggestion and calculation of new sealing a knot and calculation existing sealing the knot. Results are confrontacion and sequentially is discussed influence on main dividing plane HCČ 317 by use the new and the existing gasket. In this work is contained description brief of legislation. This legislation must keep by design components dedicated for nuclear equipment. Next this work contain view of the most important sealing knots used in primary system of Nuclear Power Plant type VVER 440.
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Nosko, Svetozár. "Akcelerace HDR tone-mappingu na platformě Xilinx Zynq." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255329.
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This diploma thesis focuses on the High-level synthesis (HLS). The first part deals with theoretical details and methods that are used in HLS tools. This is followed by a description of the synthesis tool Vivado HLS which will be used for implementation of an application. In the second part is briefly introduced high dynamic range images (HDR) and tone mapping. The third part is dedicated to design and implementation of the aplication which implements tone mapping methods in HDR images. This methods are implemented in Vivado HLS and language C++. This application is based on platform Xilinx Zynq and it uses multiexposure camera for capturing HDR images. Images are transmitted to FPGA for tone mapping processing.
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Mir, Junaid. "High dynamic range (HDR) video compression and distribution." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/844853/.
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The continuous challenge of capturing and representing the high fidelity representation of the real-world scene on display devices to invoke true-to-life visual sensations has been the driving force behind the development of High Dynamic Range (HDR) imaging technologies. HDR imaging technologies enables the capture, storage and display of the light levels and colours inherent in the original capture of content. By doing so, it enables the HDR video to provide the sensation and quality which is closer to the seamless and immersive real-world appearance. However, existing conventional display devices being Low Dynamic Range (LDR) in nature and multimedia delivery technologies being designed and optimized for the 8-bit LDR video signal, does not support HDR video visualization and distribution, respectively. In this thesis, we explore how to exploit and utilize the existing multimedia delivery technologies for HDR video distribution keeping in view the need for backward-compatibility with already existing LDR displays. Unlike LDR video, HDR video utilizes higher bit-depth to faithfully preserve the luminance dynamic range encountered in the real-world scene and thus, cannot be distributed through current 8-bit video distribution infrastructure. Further, although HDR information can be utilized for rendering a closer to real-world LDR representation, this cannot be done by the LDR video player and display devices due to the incompatibility with HDR video. These challenges are addressed in our first contribution. We propose a two-layer scalable HDR video distribution method which is backward-compatible with the existing encoders and with ubiquitous LDR display devices. The base layer in the proposed method carries the LDR representation for LDR displays, generated from the HDR video. Whereas, the extension layer encodes the HDR information as a 8-bit video signal. An efficient mapping function is employed in the extension layer to improve the coding efficiency of the extension layer which in turn improves the HDR video quality in comparison to the other backward-compatible HDR video distribution methods. A review and performance evaluation of the state-of-the-art HDR video distribution methods is presented in our second contribution. This was done to categorize and critique the existing HDR video distribution methods in order to contribute to ongoing HDR video distribution standardization efforts which are presently impeded by the lack of comprehensive performance evaluation. 5 HDR video distribution methods, including ones in contention for being standardized as HDR video distribution method, were evaluated to present the performance assessment and behaviour of these methods for HDR video sequences having different characteristics. We showed that the performance of HDR video distribution methods is generally affected by the dynamic range and spatio-temporal characteristics of the HDR videos. Further, apart from identifying the most suitable distribution method for HDR video, we also highlighted the discrepancy in the prediction of HDR quality measured through the different HDR quality metrics employed. In our last contribution, we first presented the novel usage of the Perceptual Transfer Function (PTF) for improving and optimizing the compression performance of the state-of-the-art video compression standard; High Efficiency Video Coding (HEVC), for the HDR video compression. The PTF is utilized in the Rate-Distortion Optimization (RDO) process and results in an improved coding performance in terms of the Rate-Distortion efficiency for HDR video compression. We showed that using a PTF which is backward-compatible with the LDR transfer function can improve the HEVC compression efficiency which implies that HEVC needs to be optimized for the HDR video compression. Based on these observation, we further optimized the HEVC RateControl (RC) algorithm for the HDR video compression. A new λ-QP relationship is proposed which better estimates the relation between the HDR distortions and the bitrate utilized. As a result, intelligent bitrate allocation to the coding levels is achieved keeping in view the characteristics of the HDR content which results in an improved HDR quality at the same bitrate in comparison to the default RC algorithm for the HDR video.
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Nascimento, Daniela Neves do [UNESP]. "Avaliação do uso de imagens HDR no estudo de iluminação." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/89763.
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O conforto visual no ambiente de trabalho também é alvo de estudo da ergonomia, e com o auxílio da análise de imagens digitais – HDR (High Dynamic Range) é possível ter um estudo mais rápido e barato contribuindo assim para o bem estar dos trabalhadores, já que uma boa iluminação tornará o ambiente de trabalho mais produtivo e prazeroso. Tem-se por objetivo especificamente, estudar formas de caracterizar o ambiente em relação à possibilidade da ocorrência de ofuscamento a partir de imagens HDR e viabilizar o uso de câmeras fotográficas digitais de uso amador, com lentes padrão, no desenvolvimento de uma sistemática e da correspondente instrumentação para avaliar índices de ofuscamento empregando imagens HDR compostas a partir de fotos obtidas com tais câmeras
The visual comfort in the work environment also is white of study of the ergonomics, and with the aid of the analysis of digital images - HDR (High Dynamic Range) is possible to have a cheap study faster e thus constributing it welfare of the workers, science a good illumination will became the environment of more productive and pleasant work. It is had specifically for objective, to study forms to characterize the environment in relation a possibility da ofuscamento occurrence to leave of images HDR and to make possible the use of digital cameras of amoteur use, with leses standard, no development of a systematics and da corresponding instrumentation to evaluate ofuscamento indices being used composed images HDR to leave of photos gotten with such cameras
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Sun, Ning. "HDR image construction from multi-exposed stereo LDR images." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/40130.
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The vast majority of cameras in the market nowadays can only capture a limited dynamic
range of a scene. To generate high dynamic range (HDR) images, most existing methods use
multiple images obtained from a single low dynamic range (LDR) camera at consecutive instances. These methods can obtain good quality HDR images for still or slow motion scenes but not for scenes with fast motion.
In this thesis, we propose the use of two LDR cameras which have different exposures. To
generate an HDR image, the two differently exposed LDR images of the same scene are used. The two LDR images should be captured at the same instance, so as to deal with scenes with fast motion. The most challenging step in this approach is to obtain accurate estimates of the disparity maps of the scenes. This will allow us to correctly align the pixels from the two differently exposed pictures when forming the HDR images. Very few state-of-the-art stereo matching algorithms can deal with the problem of obtaining accurate estimates of the disparity map from two differently exposed images. This is because the input LDR images that are used to construct HDR images have large radiometric changes. In addition, the two input LDR images usually have saturations in different areas. To obtain accurate disparity maps, we present a novel algorithm that obtains an initial estimate of the disparity map. Then a refinement step is used to minimize the edge effect and interpolates the values in the saturated regions.
Compared to other state-of-the-art methods, our algorithm has a simpler set up with only two standard commercial LDR cameras. The offline processing of the LDR images has a simpler cost function, especially the cost function we use in the refinement step of the disparity map. This reduces the computational complexity and thus the processing time of the LDR images to form the HDR image. Moreover, the disparity map computed by our algorithm can tolerate greater radiometric changes and saturations. Therefore, the HDR images constructed by our algorithm are smoother and have fewer defects than those constructed by other methods.
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Toye, Warren, and michelletoye@optusnet com au. "HDR Brachytherapy: Improved Methods of Implementation and Quality Assurance." RMIT University. Applied Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080528.091630.
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This thesis describes experimental work performed (1998-2001) during the author's involvement with the Brachytherapy group at the Peter MacCallum Cancer Centre (PMCC), where he was employed by its Department of Physical Sciences and subsequent modeling and analytical studies. When PMCC added HDR brachytherapy to its radiation therapy practice, an existing operating suite was considered the ideal location for such procedures to be carried out. The integration of brachytherapy into the theatre environment was considered logical due to the relatively invasive nature of brachytherapy techniques and the availability of medical equipment. This thesis contains the detailed study of three key Research Questions involved in clinical aspects relating to quality assurance of an HDR brachytherapy practice. An investigative chapter is dedicated to the pursuit of each of the Research Questions. The first question asked
Is the novel approach to using modular shielding combined with time and distance constraints adequately optimized during HDR brachytherapy? In order to establish optimal clinical practices, this project evaluates the effectiveness of additional shielding added to the modular shielding system without modification of the previously determined time and distance constraints for PMCC staff, other patients, and member of the public. The DOSXYZnrc user code for the EGSnrc Monte Carlo radiation transport code has been used to model exposure pathways to strategic locations used for measurement in and around the operating theatre suite. Modeling allowed exposure pathways to various areas with the facility to be tested without the need to use real sources. The second Research Question asked
How well is dose anisotropy characterized in the near field range of the clinic's HDR 192Ir source? This study experimentally investigated the anisotropy of dose around a 192Ir HDR source in a water phantom using MOSFETs as relative dosimeters. In addition, modeling using the DOSRZnrc user code for the EGSnrc Monte Carlo radiation transport code was performed to provide a complete dose distribution consistent with the MOSFET measurements. Measurements performed for radial distances from 5 to 30 mm extend the range of measurements to 5 mm which has not been previously reported for this source construction. The third Research Question is aimed at the patient level. Is the dose delivered to in vivo dosimeters, located within critical anatomical structures near the prostate, within acceptable clinical tolerance for a large group of HDR prostate patients? An in vivo dosimetry technique employing TLDs to experimentally measure doses delivered to the urethra and rectum during HDR prostate brachytherapy was investigated. Urethral and rectal in vivo measurements for 56 patients have been performed in the initial fraction of four-fraction brachytherapy boost. In the absence of comparable in vivo data, the following local corrective action level was initially proposed: more than 50% of the prostatic urethra receiving a dose 10% beyond the urethral tolerance. The level for investigative action is considered from the analyses of dose differences between measured data and TPS calculation.
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Singnoo, Jakkarin. "A simplified HDR image processing pipeline for digital photography." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/41945/.
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High Dynamic Range (HDR) imaging has revolutionized the digital imaging. It allows capture, storage, manipulation, and display of full dynamic range of the captured scene. As a result, it has spawned whole new possibilities for digital photography, from photorealistic to hyper-real. With all these advantages, the technique is expected to replace the conventional 8-bit Low Dynamic Range (LDR) imaging in the future. However, HDR results in an even more complex imaging pipeline including new techniques for capturing, encoding, and displaying images. The goal of this thesis is to bridge the gap between conventional imaging pipeline to the HDR’s in as simple a way as possible. We make three contributions. First we show that a simple extension of gamma encoding suffices as a representation to store HDR images. Second, gamma as a control for image contrast can be ‘optimally’ tuned on a per image basis. Lastly, we show a general tone curve, with detail preservation, suffices to tone map an image (there is only a limited need for the expensive spatially varying tone mappers). All three of our contributions are evaluated psychophysically. Together they support our general thesis that an HDR workflow, similar to that already used in photography, might be used. This said, we believe the adoption of HDR into photography is, perhaps, less difficult than it is sometimes posed to be.
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Emami, Seyed Majid. "Communication through high delay spread X bandwidth (HDB) channels /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Amoush, Ahmad A. "Error Analysis of non-TLD HDR Brachytherapy Dosimetric Techniques." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307105202.
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Abebe, Mekides Assefa. "Perceptual content and tone adaptation for HDR display technologies." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2285/document.
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Les technologies de capture et d'affichage d'images ont fait un grand pas durant la dernière décennie en termes de capacités de reproduction de la couleur, de gamme de dynamique et de détails des scènes réelles. Les caméras et les écrans à large gamme de dynamique (HDR: high dynamic range) sont d'ores et déjà disponibles, offrant ainsi plus de flexibilité pour les créateurs de contenus afin de produire des scènes plus réalistes.Dans le même temps, à cause des limitations des appareils conventionnels, il existe un gap important en terme de reproduction de contenu et d'apparence colorée entre les deux technologies. Cela a accentué le besoin pour des algorithmes prenant en compte ces considérations et assurant aux créateurs de contenus une reproduction cross-média fidèle.Dans cette thèse, nous focalisons sur l'adaptation et la reproduction des contenus à gamme de dynamique standard sur des dispositifs HDR. Tout d'abord, les modèles d'apparence colorée ainsi que les opérateurs de mappage tonal inverse ont été étudiés subjectivement quant à leur fidélité couleur lors de l'expansion de contenus antérieurs. Par la suite, les attributs perceptuels de clarté, chroma et saturation ont été analysés pour des stimuli émissifs ayant des niveaux de luminance de plus hautes gammes et ce en menant une étude psychophysique basée sur la méthode de mise à l'échelle de partitions. Les résultats expérimentaux ont permis de mener à la définition d'un nouvel espace couleur HDR efficace et précis, optimisé pour les applications d'adaptation de la gamme de dynamique. Enfin, dans l'optique de récupérer les détails perdus lors de captures d'images standard et d'améliorer la qualité perçue du contenu antérieur avant d'être visualisé sur un dispositif HDR, deux approches de correction des zones surexposées ou ayant subi un écrêtage couleur ont été proposées. Les modèles et algorithmes proposés ont été évalués en comparaison avec une vérité terrain HDR, menant à la conclusion que les résultats obtenus sont plus proches des scènes réelles que les autres approches de la littératureCamera and display technologies have greatly advanced in their capacities of reproducing color, dynamic range and details of real scenes in recent years. New and powerful high dynamic range (HDR) camera and display technologies are currently available in the market and, recently, these new HDR technologies offer higher flexibility to content creators, allowing them to produce a more precise representation of real world scenes.At the same time, limitations of conventional camera and display technologies mean that there is a significant gap in terms of content and color appearance reproduction between new and existing technologies. These mismatches lead to an increased demand for appearance studies and algorithms which take such under consideration and help content creators to perform accurate cross-media reproductions.In this thesis we mainly considered the adaptation and reproduction of standard dynamic range content towards HDR displays. First, existing color appearance models and reverse tone mapping operators were subjectively studied for their color fidelity during dynamic range expansion of legacy contents. Then perceptual lightness, chroma and saturation attributes were analyzed for emissive stimuli with higher range of luminance levels using adapted psycho-visual experimental setups based on the partition scaling method. The experimental results lead to a new, more efficient and accurate HDR color space, specifically optimized for dynamic range adaptation applications. Finally, to recover lost details and enhance the visual quality of legacy content before visualizing on an HDR display, two methods for color-clipping and over-exposure correction were introduced. The models and algorithms presented, were evaluated relative to HDR ground truth content, showing that our results are closer to the real scene than can be achieved with previous methods
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Urbano, António Carlos Alves. "Visualização de imagens HDR em dispositivos com ecrã pequeno." Doctoral thesis, Universidade de Trás-os-Montes e Alto Douro, 2013. http://hdl.handle.net/10400.8/976.
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Tese de Doutoramento em Informática apresentada à Universidade de Trás-os-Montes e Alto Douro em 2013.Nas duas últimas décadas, assistimos ao desenvolvimento de um número crescente de técnicas, designadas por tone mapping operators (TMO), para reprodução de imagens com elevada gama dinâmica (high dynamic range – HDR) em ecrãs tradicionais. Apesar de recentemente terem surgido TMO que têm em conta a característica específica de cada dispositivo de visualização, nenhum desses algoritmos foi desenvolvido especificamente para dispositivos com ecrã pequeno (DEP). Assim, nesta tese foi realizado um estudo sobre a visualização de imagens HDR em DEP, tendo como propósito a proposta de soluções para a melhoria da sua visualização. Inicialmente foi realizada uma avaliação dos TMO atualmente existentes que mostrou que os DEP com tamanho limitado, resolução e profundidade de cor, exigem uma investigação específica para encontrar ou criar uma solução adequada. Esse estudo permitiu, também, identificar um conjunto de características dos TMO que precisam ser enfatizadas para obter imagens mapeadas com uma maior fidelidade nos DEP, especialmente o realce dos detalhes. Com base nesse estudo foi proposta uma solução para visualização de imagens HDR em DEP, que tem por base a construção de um TMO híbrido. O TMO proposto, tendo por base um qualquer TMO, tenta melhorar os detalhes das imagens mapeadas com o TMO original. Através da realização de experiências psicofísicas foi demonstrado que este novo TMO produz melhores resultados em DEP que os obtidos com o TMO original. Apesar de ter sido desenvolvido um protótipo em J2ME do novo TMO, a sua atual implementação ainda é pouco eficiente para a realização de testes diretamente em DEP. Em conclusão, com este trabalho é identificada a problemática da visualização de imagens HDR em DEP, sendo apontadas sugestões de como melhorar esse processo e fica ainda a proposta de um novo TMO.
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Singh, Anju Sonya Suzie [Verfasser]. "CT-gesteuerte Hochdosis-Brachytherapie (CT-HDRBT) von hilusnahen Lebermetastasen / Anju Sonya Suzie Singh." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2012. http://d-nb.info/102730799X/34.
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Eilertsen, Gabriel, Jonas Unger, Robert Wanat, and Rafal Mantiuk. "Survey and Evaluation of Tone Mapping Operators for HDR-video." Linköpings universitet, Medie- och Informationsteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-92672.
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This work presents a survey and a user evaluation of tone mapping operators (TMOs) for high dynamic range (HDR) video, i.e. TMOs that explicitly include a temporal model for processing of variations in the input HDR images in the time domain. The main motivations behind this work is that: robust tone mapping is one of the key aspects of HDR imaging [Reinhard et al. 2006]; recent developments in sensor and computing technologies have now made it possible to capture HDR-video, e.g. [Unger and Gustavson 2007; Tocci et al. 2011]; and, as shown by our survey, tone mapping for HDR video poses a set of completely new challenges compared to tone mapping for still HDR images. Furthermore, video tone mapping, though less studied, is highly important for a multitude of applications including gaming, cameras in mobile devices, adaptive display devices and movie post-processing. Our survey is meant to summarize the state-of-the-art in video tonemapping and, as exemplified in Figure 1 (right), analyze differences in their response to temporal variations. In contrast to other studies, we evaluate TMOs performance according to their actual intent, such as producing the image that best resembles the real world scene, that subjectively looks best to the viewer, or fulfills a certain artistic requirement. The unique strength of this work is that we use real high quality HDR video sequences, see Figure 1 (left), as opposed to synthetic images or footage generated from still HDR images.VPS
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Nascimento, Daniela Neves do. "Avaliação do uso de imagens HDR no estudo de iluminação /." Bauru : [s.n.], 2008. http://hdl.handle.net/11449/89763.
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Orientador: João Roberto Gomes de FariaBanca: Paulo Sérgio Sacarazzato
Banca: Luiz Gonzaga Campos Porto
Resumo: O conforto visual no ambiente de trabalho também é alvo de estudo da ergonomia, e com o auxílio da análise de imagens digitais - HDR (High Dynamic Range) é possível ter um estudo mais rápido e barato contribuindo assim para o bem estar dos trabalhadores, já que uma boa iluminação tornará o ambiente de trabalho mais produtivo e prazeroso. Tem-se por objetivo especificamente, estudar formas de caracterizar o ambiente em relação à possibilidade da ocorrência de ofuscamento a partir de imagens HDR e viabilizar o uso de câmeras fotográficas digitais de uso amador, com lentes padrão, no desenvolvimento de uma sistemática e da correspondente instrumentação para avaliar índices de ofuscamento empregando imagens HDR compostas a partir de fotos obtidas com tais câmeras
Abstract: The visual comfort in the work environment also is white of study of the ergonomics, and with the aid of the analysis of digital images - HDR (High Dynamic Range) is possible to have a cheap study faster e thus constributing it welfare of the workers, science a good illumination will became the environment of more productive and pleasant work. It is had specifically for objective, to study forms to characterize the environment in relation a possibility da ofuscamento occurrence to leave of images HDR and to make possible the use of digital cameras of amoteur use, with leses standard, no development of a systematics and da corresponding instrumentation to evaluate ofuscamento indices being used composed images HDR to leave of photos gotten with such cameras
Mestre
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Munhoz, Rafael Gomes. "Processamento de imagens HDR utilizando shaders gráficos em múltiplas plataformas." reponame:Repositório Institucional da UFABC, 2017.
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Orientador: Prof. Dr. André Guilherme Ribeiro BalanDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Ciência da Computação, 2017.
Uma cena real possui uma grande variação de contraste que, quando vista pelo olho humano, resulta em detalhes que sensores de câmeras digitais comuns não conseguem capturar. Isso ocorre devido às limitações dos dispositivos para obter e exibir diferentes valores de cor. Imagens HDR (High Dynamic Range), por sua vez, são representações que conseguem reproduzir essa amplitude de valores. Para gerar e exibir imagens HDR, diante das limitações dos dispositivos, é necessário trabalhar em um domínio de menor alcance, com imagens LDR (Low Dynamic Range). Os algoritmos que mapeiam os valores entre os domínios são chamadas de operadores de tone-mapping. Apenas a aplicação de tone-mapping não gera resultados de alta qualidade, sendo necessárias técnicas de redução de ruídos e decomposição de imagem para tal. Essas técnicas implicam um alto custo computacional e demandam muito tempo quando executados na CPU. Por outro lado, o processamento na GPU oferece um paralelismo natural, por viabilizar operações a serem aplicadas a todos os pixels, simultaneamente. Uma das maneiras de programar essas operações na GPU é através do uso de shaders gráficos, alterando a forma que os pixels da imagem são reproduzidos. Com o constante crescimento da utilização de dispositivos móveis, um tema recorrente é o desempenho e a viabilidade de aplicações de alta performance em tais dispositivos, que atualmente, na maioria dos casos, possuem em sua arquitetura uma GPU programável. Nesse trabalho, desenvolvemos shaders gráficos OpenGL para processar operações de tonemapping, bem como a decomposição multiescala de imagens utilizando filtros não lineares importantes e modernos, a fim de preservar a maioria dos detalhes das imagens. Isso gera resultados mais nítidos quando comparados com técnicas que aplicam os operadores de tone-mapping diretamente nas imagens. Por outro lado, o processamento em GPU representa uma enorme melhoria de velocidade em relação ao processamento da CPU. A aplicação que desenvolvemos é multiplataforma para que ele possa ser executado em desktops e dispositivos móveis. Utilizamos a aplicação para avaliar o desempenho de diferentes operadores de tone-mapping e diferentes filtros de imagem não lineares para executar a decomposição de imagens em vários níveis.
A typical scene may have a highly nonuniform illumination that common digital camera sensors are currently not able to deal with, as well as typical screen monitors. A High Dynamic Range image (HDR) is an image model capable to store much larger illumination range than regular models, what is more similar to our human system view. To generate and display HDR images, given the limitations of the devices (cameras and screen monitors), it is necessary to work in a domain with smaller range, called LDR images (Low Dynamic Range). The algorithms that map HDR images to LDR images are called tone-mapping operators. These algorithms, when operating on very high resolution HDR images, demand very high computational effort that CPU are also not currently capable to deal with. On the other hand, GPU offers a natural parallelism by enabling operations to be applied on thousands of pixels simultaneously. One way to program these operations on the GPU is through the use of graphics shaders, directly changing a graphical pipeline that reproduce pixels of the image, such as OpenGL pipeline. Nowadays, mobile devices are also highly available devices that can have powerful GPUs. Hence, an important research subject is to access the viability of using such devices on HDR image processing and tone-mapping. In this work, we develop OpenGL graphic shaders to process tone-mapping operation as well as image multiscale decomposition using important and modern nonlinear image filters, in order to preserve the most of the images details. This generates sharper results when compared to techniques that directly apply tone-mapping operators on the images. On the other hand, GPU processing represents a huge speed improvement over CPU processing. The application we develop is multiplatform so it can run on desktops and mobile devices. We used it to evaluate the performance of different tone-mapping operators and different nonlinear image filters to perform image multiscale decomposition.
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Fonseca, Gabriel Paiva. "Modelagem pelo método de Monte Carlo do paciente e das complexidades dos tratamentos braquiterápicos com alta taxa de dose." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-06012016-155103/.
Full textAbstract:
Tratamentos braquiterápicos são comumente realizados conforme o relatório da American Association of Physicists in Medicine (AAPM), Task Group report TG-43U1, o qual define o formalismo para cálculo de dose absorvida na água e não considera a composição dos materiais, densidades, dimensões do paciente e o efeito dos aplicadores. Estes efeitos podem ser significantes, conforme descrito pelo recente relatório da AAPM, Task Group report TG- 186, que define diretrizes para que sistemas de planejamento modernos, capazes de considerar as complexidades descritas acima, sejam implementados. Esta tese tem como objetivo contribuir para o aumento da exatidão dos planejamentos de tratamento braquiterápicos, seguindo as recomendações do TG-186 e indo além do mesmo. Um software foi desenvolvido para integrar planejamentos de tratamento e simulações pelo método de Monte Carlo (MC); modelos acurados, CAD-Mesh, foram utilizados para representar aplicadores braquiterápicos; Grandezas utilizadas para reportar dose absorvida, Dw,m (dose para água no meio) e Dm,m (dose para o meio no meio), foram calculadas para um tratamento de cabeça e pescoço, considerando a teoria para pequenas (SCT small cavity theory) e grandes cavidades (LCT large cavity theory); a componente da dose em razão do movimento da fonte foi avaliada para tratamentos de próstata e ginecológicos. Perfis de velocidade obtidos na literatura foram utilizados; medidas de velocidade de uma fonte braquiterapica foram realizadas com uma câmera de alta taxa de aquisição. Cálculos de dose obtidos usando MC (incluindo a composição e densidade dos tecidos, ar e o aplicador) mostram sobredoses de aproximadamente 5% dentro do volume alvo, em um tratamento ginecológico, quando comparados aos resultados obtidos com um meio homogêneo de água. Por sua vez, subdoses de aproximadamente 5% foram observadas ao considerar a composição dos tecidos e regiões com ar em um tratamento intersticial de braço. Um aplicador cilíndrico oco resultou na sobredose observada no caso ginecológico, ressaltando a necessidade de modelos acurados para representar os aplicadores. Os modelos CAD-Mesh utilizados incluem um aplicador Fletcher-Williamson, com blindagem, e um balão deformável para irradiação de mama. Os resultados obtidos com estes modelos são equivalentes aos obtidos com modelos geométricos convencionais. Este recurso pode ser conveniente para aplicadores complexos e/ou quando o projeto dos aplicadores for disponibilizado pelo fabricante. Cálculos de dose, com a composição real dos tecidos humanos, podem apresentar diferenças significativas em razão da grandeza adotada. Diferenças entre Dm,m e Dw,m (SCT ou LCT) chegam a 14% em razão da composição do osso. A metodologia adotada (SCT ou LCT) resulta em diferenças de até 28% para o osso e 36% para os dentes. A componente de dose de trânsito também pode levar a diferenças significativas, uma vez que baixas velocidades ou movimentos uniformemente acelerados foram descritos na literatura. Considerando a pior condição e sem incluir nenhuma correção no tempo de parada, a dose de trânsito pode chegar a 3% da dose prescrita para um caso ginecológico, com 4 cateteres, e até 11.1% da dose prescrita para um tratamento de próstata, com 16 cateteres. A dose de trânsito para a fonte avaliada (velocidade obtida experimentalmente) não é uniformemente distribuída e pode levar a sub ou sobredoses de até 1.4% das doses comumente prescritas (310 Gy). Os tópicos estudados são relevantes para tratamentos braquiterápicos e podem contribuir para o aumento de sua acurácia. Os efeitos estudados podem ser avaliados com o uso do software, associado a um código MC, desenvolvido.Brachytherapy treatments are commonly performed using the American Association of Physicists in Medicine (AAPM) Task Group report TG-43U1 absorbed dose to water formalism, which neglects human tissue densities, material compositions, body interfaces, body shape and dose perturbations from applicators. The significance of these effects has been described by the AAPM Task Group report TG-186 in published guidelines towards the implementation of Treatment Planning Systems (TPS) which can take into account the above mentioned complexities. This departure from the water kernel based dose calculation approach requires relevant scientific efforts in several fields. This thesis aims to improve brachytherapy treatment planning accuracy following TG-186 recommendations and going beyond it. A software has been developed to integrate clinical treatment plans with Monte Carlo (MC) simulations; high fidelity CAD-Mesh geometry was employed to improve brachytherapy applicators modelling; different dose report quantities, Dw,m (dose to water in medium) and Dm,m (dose to medium in medium), were obtained for a head and neck case using small cavity theory (SCT) and large cavity theory (LCT); the dose component due to the source moving within the patient was evaluated for gynecological and prostate clinical cases using speed profiles from the literature. Moreover, source speed measurements were performed using a high speed camera. Dose calculations using MC showed overdosing around 5% within the target volume for a gynecological case comparing results obtained including tissue, air and applicator effects against a homogeneous water phantom. On the other hand, the same comparison showed underdosing around 5% when including tissue and air composition for an interstitial arm case. A hollow cylinder applicator was responsible for the overdosing observed for the gynecological case highlighting the importance of accurate applicator modelling. The evaluated CAD-Mesh applicators models included a Fletcher- Williamson shielded applicator and a deformable balloon used for accelerated partial breast irradiation. Results obtained were equivalent to ones obtained with conventional constructive solid geometry and may be convenient for complex applicators and/or when manufacturer CAD models are available. Differences between Dm,m and Dw,m (SCT or LCT) are up to 14% for bone in a evaluated head and neck case. The approach (SCT or LCT) leads to differences up to 28% for bone and 36% for teeth. Differences can also be significant due to the source movement since some speed profiles from literature show low source speeds or uniform accelerated movements. Considering the worst case scenario and without include any dwell time correction, the transit dose can reach 3% of the prescribed dose in a gynecological case with 4 catheters and up to 11.1% when comparing the average prostate dose for a case with 16 catheters. The transit dose for a high speed (measured with a video camera) source is not uniformly distributed leading to over and underdosing, which is within 1.4% for commonly prescribed doses (310 Gy). The main subjects evaluated in this thesis are relevant for brachytherapy treatment planning and can improve treatment accuracy. Many of the issues described in here can be assessed with the software, coupled with a MC code, developed in this work.
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Golenia, Mascha Jasmin [Verfasser]. "Hepatisch metastasiertes Mammakarzinom : Perkutane Ablation mittels CT-gesteuerter Hochdosis-Brachytherapie (CT-HDRBT) / Mascha Golenia." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2013. http://d-nb.info/1035638940/34.
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Clark, Brian Sean. "Time lapse HDR: time lapse photography with high dynamic range images." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2408.
Full textAbstract:
In this thesis, I present an approach to a pipeline for time lapse photography using
conventional digital images converted to HDR (High Dynamic Range) images (rather
than conventional digital or film exposures). Using this method, it is possible to
capture a greater level of detail and a different look than one would get from a
conventional time lapse image sequence. With HDR images properly tone-mapped
for display on standard devices, information in shadows and hot spots is not lost, and
certain details are enhanced.
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Löw, Joakim, Anders Ynnerman, Per Larsson, and Jonas Unger. "HDR Light Probe Sequence Resampling for Realtime Incident Light Field Rendering." Linköpings universitet, Visuell informationsteknologi och applikationer, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18052.
Full textAbstract:
This paper presents a method for resampling a sequence of high dynamic range light probe images into a representation of Incident Light Field (ILF) illumination which enables realtime rendering. The light probe sequences are captured at varying positions in a real world environment using a high dynamic range video camera pointed at a mirror sphere. The sequences are then resampled to a set of radiance maps in a regular three dimensional grid before projection onto spherical harmonics. The capture locations and amount of samples in the original data make it inconvenient for direct use in rendering and resampling is necessary to produce an efficient data structure. Each light probe represents a large set of incident radiance samples from different directions around the capture location. Under the assumption that the spatial volume in which the capture was performed has no internal occlusion, the radiance samples are projected through the volume along their corresponding direction in order to build a new set of radiance maps at selected locations, in this case a three dimensional grid. The resampled data is projected onto a spherical harmonic basis to allow for realtime lighting of synthetic objects inside the incident light field.
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Hajisharif, Saghi. "Real-time image based lighting with streaming HDR-light probe sequences." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91324.
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This work presents a framework for shading of virtual objects using high dynamic range (HDR) light probe sequences in real-time. The method is based on using HDR environment map of the scene which is captured in an on-line process by HDR video camera as light probes [32]. In each frame of the HDR video, an optimized CUDA kernel is used to project incident lighting into spherical harmonics in real time. Transfer coefficients are calculated in an offline process. Using precomputed radiance transfer the radiance calculation reduces to a low order dot product between lighting and transfer coefficients. We exploit temporal coherence between frames to further smooth lighting variation over time. Our results show that the framework can achieve the effects of consistent illumination in real-time with flexibility to respond to dynamic changes in the real environment. We are using low-order spherical harmonics for representing both lighting and transfer functions to avoid aliasing.
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Aldelaijan, Saad. "Reference dosimetry of HDR Ir-192 brachytherapy source using radiochromic film." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95205.
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A protocol of establishing radiochromic film based reference dosimetry for high dose rate Ir-192 brachytherapy source was assessed and described. A comparison between calibration curves created in water and Solid Water are provided. Solid Water was shown to be a viable alternative to water in establishing calibration curve for Ir-192 radiation beam. A Monte Carlo correction factor was calculated to convert the dose to water into dose to Solid Water and the experimental methods that we performed agreed with the Monte Carlo results where the ratio (DSW/DW)Ir-192 was found to be 0.9808 ± 0.14% (1σ). EBT-2 GAFCHROMIC film model was also investigated for absorption properties and found to be a less sensitive than its predecessor (EBT-1) in terms of net change of absorbance, but that did not affect the dosimetric value that this film possesses. A dose error assessment method has been described for EBT-2 film model (and is applicable to other types as well) that can establish the time error constraints on the post-irradiation scanning time that will still provide an acceptable dose error for clinical applications if the protocol employing the shorter post-irradiation scanning time is implemented in the clinic. We show that for two post-irradiation scanning times of 30 minutes and 24 hours the 1% dose error can be granted if the scanning time window is less than ± 5 minutes and ± 2 hours, respectively. Performance of EBT-2 model was also evaluated in water and it was concluded that a suggested correction protocol is necessary for immersion times that exceed 2 hours. This correction was tested with the calibration curve created from water setup and found to be effective when compared to the dose-corrected calibration curve in Solid Water.Un protocole d'établir film radiochromique dosimétrie de référence en fonction de débit de dose élevé source Ir-192 curiethérapie été évalués et décrits. Une comparaison entre les courbes d'étalonnage créé dans l'eau et Solid WaterTM sont fournis. Solid WaterTM s'est révélée être une alternative viable à l'eau dans l'établissement de la courbe d'étalonnage pour les Ir-192 faisceau de rayonnement. Un facteur de correction de Monte Carlo a été calculé pour convertir la dose à l'eau en dose à Solid WaterTM et les méthodes expérimentales que nous avons réalisé d'accord avec les résultats de Monte Carlo où le ratio (DSW/DW)Ir-192 a été trouvé à 0.9808 ± 0.14% (1σ). EBT-2 modèle GAFCHROMICTM film a également été étudiée pour les propriétés d'absorption et jugé être un moins sensible que son prédécesseur (EBT-1) en termes de variation nette de l'absorbance, mais cela n'a pas d'incidence sur la valeur dosimétrique que ce film possède. Une méthode d'évaluation des doses d'erreur a été décrit pour le modèle EBT-2 film (et est applicable à d'autres types ainsi) qui permet d'établir les contraintes de temps d'erreur sur le post-irradiation temps de balayage, qui va encore donner une erreur de dose acceptable pour des applications cliniques, si le protocole emploie le plus court post-irradiation de numérisation temps est mis en uvre dans la clinique. Nous montrons que pour deux post-irradiation de numérisation fois de 30 minutes et 24 heures, la dose d'erreur de 1% peut être accordée si la fenêtre de temps de balayage est inférieure à ± 5 minutes et de ± 2 heures, respectivement. Performance de la EBT-2 modèle a également été évaluée dans l'eau et il a été conclu un protocole de correction proposé est nécessaire pour que les temps d'immersion supérieure à 2 heures. Cette correction a été testé avec la courbe de calibration créée à partir d'installation de l'eau et ont été jugés effic
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Looij, Marjolein Annigje Johanna van. "Hearing loss in HDR syndrome, a study of mice and men." [S.l.] : Rotterdam : [The Author] ; Erasmus University [Host], 2007. http://hdl.handle.net/1765/10529.
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Wolf, Sabine Charlotte [Verfasser]. "Inverse Dosisoptimierung für die HDR-Brachytherapie des Prostatakarzinoms / Sabine Charlotte Wolf." Kiel : Universitätsbibliothek Kiel, 2013. http://d-nb.info/104218559X/34.
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JÚNIOR, GILBERTO PAIVA DE MEDEIROS. "IMAGE COMPOSITING WITH HDR LIGHTING BY IMPROVING THE DIFFERENTIAL RENDERING TECNIQUE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13893@1.
Full textAbstract:
Este trabalho tem por objetivo apresentar uma melhoria à técnica estado-daarte
de composição de imagens usando Renderização Diferencial. Uma aplicação
é desenvolvida usando imagens HDR, na qual combinar elementos virtuais e reais
em uma única cena produz melhores resultados do que os obtidos pela técnica
original. Inicialmente, este trabalho apresenta algumas técnicas de composição de
imagens e conceitos sobre imagens HDR e iluminação baseada em imagens. Em
seguida, a técnica original de Paul Debevec é apresentada através de seus cálculos
e exemplos de composição de imagens. A melhoria proposta resume-se a
adicionar mais uma imagem da cena ao conjunto de imagens utilizado pela técnica
original. Esta melhoria é de grande importância para aplicações que necessitam de
um alto grau de realismo, porque permite uma melhor integração entre as partes
virtual e real de uma cena. Vários testes são apresentados que comprovam a
eficácia da melhoria proposta.This work aims to present an improvement to the image compositing stateof- the-art technique using Differential Rendering. An application is developed using HDR images, in which combining virtual and real elements into a single scene produces better results than the ones obtained by the original technique. Firstly, this work presents some techniques of image compositing, and concepts on HDR images and image-based lighting. Next, the original technique by Paul Debevec is presented through its calculations and examples of image compositing. The proposed improvement adds one more image to the set of images used by the original technique. This improvement is of great importance for applications that need a high degree of realism, because it allows a better integration between the virtual and real parts of a scene. Several tests are presented that prove the effectiveness of the proposed improvement.
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Rodrigues, Lídia Maria. "Processamento de imagens HDR utilizando filtros não lineares e decomposição multiescala." reponame:Repositório Institucional da UFABC, 2014.
Find full textAbstract:
Orientador: Prof. Dr. André Guilherme Ribeiro BalanDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Ciência da Computação, 2014.
A fotografia é uma atividade em grande crescimento e desenvolvimento, não apenas entre prossionais, mas também para a sociedade como um todo. Espera-se que a imagem tomada de uma determinada cena seja tão real quanto possível, e, por sua vez, que os equipamentos existentes sejam capazes de obter e visualizar essas imagens, o mais el possível da cena que está sendo registrada. O trabalho desenvolvido e apresentado nesta dissertação busca fazer o levantamento e estudo de técnicas que manipulem imagens HDR (High Dynamic Range), ou seja, imagens que possuem grande quantidade de informações da cena que representa, a m de torná-las visualizáveis com todos os detalhes nela contidos de maneira mais real possível ou de forma artística. A manipulação necessária para tais imagens é realizada por meio do mapeamento das imagens HDR para imagens LDR (Low Dynamic Range). O mapeamento das imagens HDR pode ser realizado com operadores de tone mapping e, como abordado nesta dissertação, com a decomposição multiescala. A decomposição multiescala oferece resultados de alta qualidade, tornando se um método de grande importância para o área de Processamento de Imagens, pelo fato de dividir a imagem de entrada em camadas e manipulá-las individualmente, para depois restaurá-la. Neste trabalho são avaliados métodos de ltragem não linear e operadores de tone mapping que melhor se adequam ao processo de decomposição multiescala e ao método de decomposição multiescala juntamente com a aplicação de compressão das camadas obtidas no processo de decomposição, a m de obter imagens reais com aprimoramento e destaque de seus detalhes. Adicionalmente, é proposto um novo operador de tone mapping local baseado no operador local de Reinhard, com as mesmas características e, com ajuste de parâmetro, que obtém resultados mais robustos que o operador local de Reinhard. Com isso, novos parâmetros ou métodos são propostos para aumentar a qualidade das imagens obtidas.
Photography is an activity in huge growth and development, not only among professionals, but also to society as a whole. It is expected that an image taken of a certain scene be as real as possible and, for its turn, that the existing equipment could obtain and visualize those images as accurately as the scene being recorded. The work developed and presented in this dissertation seeks to do a survey and a study of techniques which manipulate HDR (High Dynamic Range) images, in other words, of images that have large amount of information of a scene that is represented, in order to turn the images viewable with all the details they have as accurately as possible or in an artistic format. The required manipulation of those images is held by the mapping from HDR images to LDR (Low Dynamic Range) images. The HDR images mapping can be done with tone mapping operators and, as discussed in this dissertation, with the multiscale decomposition.The multiscale decomposition oers high quality results, being a method of great relevance to the Image Processing area, by the fact that it divides the input image in layers and manipulates these individually, to restore the image, after that. In this work, the non-linear lter methods and tone mapping operators that best t the multiscale decomposition process and multiscale decomposition method along with the application of layers compression, are evaluated to obtain real images with improvement and details highlighted. Besides that, a new tone mapping operator is proposed, based on the Reinhard local operator, with the same characteristics and with parameter settings, which gives more robust results than the Reinhard local operator. Thus, new parameters or methods are suggested to increase the obtained image quality.