Bibliografie tematiche / 3D holograms

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Letteratura scientifica selezionata sul tema "3D holograms"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 febbraio 2022

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Articoli di riviste sul tema "3D holograms"

Shimobaba, Tomoyoshi, Shuhei Katsuyama, Takashi Nishitsuji, Ikuo Hoshi, Harutaka Shiomi, Fan Wang, Takashi Kakue, Naoki Takada e Tomoyoshi Ito. "Motion Parallax Holograms Generated from an Existing Hologram". Applied Sciences 11, n. 7 (25 marzo 2021): 2933. http://dx.doi.org/10.3390/app11072933.

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Generating new motion parallax holograms is required for holographic head-mounted displays when the head moves. Additionally, it is required for hologram generation from light field data that consist of a number of motion parallax images. However, re-rendering three-dimensional (3D) scenes and re-calculating holograms are computationally complex. Therefore, we propose a generation strategy of holograms with different motion parallax from an existing hologram without re-rendering 3D scenes and re-calculating holograms. The proposed method employs Fourier band-pass filtering and the simple relation of trigonometric functions, which makes it capable of skipping the computationally complex processes.

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Brun, H., R. A. B. Bugge, L. K. R. Suther, S. Birkeland, R. Kumar, E. Pelanis e O. J. Elle. "Mixed reality holograms for heart surgery planning: first user experience in congenital heart disease". European Heart Journal - Cardiovascular Imaging 20, n. 8 (6 dicembre 2018): 883–88. http://dx.doi.org/10.1093/ehjci/jey184.

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Abstract Aims Proof of concept and feasibility study for preoperative diagnostic use of mixed reality (MR) holograms of individual 3D heart models from standard cardiac computed tomography angiograms (CTA) images. Optimal repair for complex congenital heart disease poses high demands on 3D anatomical imagination. Three-dimensional printed heart models are increasingly used for improved morphological understanding during surgical and interventional planning. Holograms are a dynamic and interactive alternative, probably with wider applications. Methods and results A 3D heart model was segmented from CTA images in a patient with double outlet right ventricle and transposition of the great arteries (DORV-TGA). The hologram was visualized in the wearable MR platform HoloLens® for 36 paediatric heart team members who filled out a diagnostic and quality rating questionnaire. Morphological and diagnostic output from the hologram was assessed and the 3D experience was evaluated. Locally developed app tools such as hologram rotation, scaling, and cutting were rated. Anatomy identification and diagnostic output was high as well as rating of 3D experience. Younger and female users rated the app tools higher. Conclusion This preliminary study demonstrates that MR holograms as surgical planning tool for congenital heart disease may have a high diagnostic value and contribute to understanding complex morphology. The first users experience of the hologram presentation was found to be very positive, with a preference among the female and the younger users. There is potential for improvement of the hologram manipulation tools.

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Arce, Terek, Henry Fuchs e Kyla McMullen. "The Effects of 3D Audio on Hologram Localization in Augmented Reality Environments". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 61, n. 1 (settembre 2017): 2115–19. http://dx.doi.org/10.1177/1541931213602010.

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Currently available augmented reality systems have a narrow field of view, giving users only a small window to look through to find holograms in the environment. The challenge for developers is to direct users’ attention to holograms outside this window. To alleviate this field of view constraint, most research has focused on hardware improvements to the head mounted display. However, incorporating 3D audio cues into programs could also aid users in this localization task. This paper investigates the effectiveness of 3D audio on hologram localization. A comparison of 3D audio, visual, and mixed-mode stimuli shows that users are able to localize holograms significantly faster under conditions that include 3D audio. To our knowledge, this is the first study to explore the use of 3D audio in localization tasks using augmented reality systems. The results provide a basis for the incorporation of 3D audio in augmented reality applications.

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Shoydin, S. A. "Synthesis of holograms received by a communication channel". Computer Optics 44, n. 4 (agosto 2020): 547–51. http://dx.doi.org/10.18287/2412-6179-co-694.

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A method for the synthesis of holograms that reconstruct a 3D image using two 2D images, including a topographic map of the surface of a 3D object and photographs of the texture of its surface obtained using coherent and incoherent radiation is proposed. The method is suitable for transmitting information about a 3D object via a communication channel at a distance and subsequent synthesis of holograms at a distance from the holography object. It can be used in augmented reality devices, when creating holographic cameras and 3D video cameras, in 3D projectors and microscopes, devices with a synthesized aperture. The proposed method for the remote hologram synthesis is suitable for reproducing 3D holographic images of distant objects at different parts of the electromagnetic spectrum. Examples of 3D image restoration in the infrared spectral range are given. The method is also suitable for the synthesis of holograms in the UV, THz, and even radio range.

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Shoydin, Sergey A., e Artem L. Pazoev. "CORRECTION OF PROJECTIVE DEFORMATIONS OF 3D OBJECT, ON THE STAGE OF HOLOGRAM FORMATION". Interexpo GEO-Siberia 8, n. 1 (8 luglio 2020): 97–107. http://dx.doi.org/10.33764/2618-981x-2020-8-1-97-107.

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The problems of digital synthesis of holograms associated with a discrete representation of a signal forming a holographic image are analyzed. One of the significant limitations is the technological problems of the formation of holographic structures pointwise due to diffraction limitations of the size of the focused spot of the optical-mechanical builder. This narrows the spectrum of possible spatial frequencies of the pointwise synthesized hologram in comparison with the classical hologram recorded in an analog way, which in turn leads to difficulties in recording holograms with a large depth of 3D image. We discuss a way to overcome this problem by using an optical projection system with the possibility of both transverse and longitudinal image size. Some possibilities of constructing such systems are shown and experimentally confirmed, and some problems of deformation distortions of 3D images arising during their creation are analyzed.

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Li, Bingjian, Zi Yang Kang, Jiahuang Lin, Ye Yeo e Guoxian Tan. "General theories of reflection and transmission scratch holograms". Canadian Journal of Physics 95, n. 5 (maggio 2017): 432–39. http://dx.doi.org/10.1139/cjp-2016-0471.

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Scratch holograms can be created easily and the associated interesting phenomena may be observed in daily life. In this paper, general and quantitative theories of scratch holograms were derived and presented. Both the reflection case where a scratch hologram reflects light, and the transmission case where it refracts and transmits light, were considered. A predictive model, which has not been presented in the literature, was developed. The model was able to solve for the position of the bright points along the scratches using a computational method. Extensive experimentation was carried out with scratch holograms of two designs to verify the model. Photographic evidence demonstrated extremely good fits with the theoretical predictions. The model was then used to theoretically simulate the 3D spatial positions of the hologram and also quantify distortion present in the images to illustrate novel real-life applications of the theories presented.

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Boriskevich, A. A., V. K. Erohovets e V. V. Tkachenko. "3D and 2D/3D holograms model". Optical Memory and Neural Networks 21, n. 4 (ottobre 2012): 242–48. http://dx.doi.org/10.3103/s1060992x12040030.

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Hua, Hangbo, Takeshi Yamaguchi e Hiroshi Yoshikawa. "Partially Overlapping Printing with Digital Filter to Improve Quality of Volume Hologram Printer – Numerical Simulation –". Applied Sciences 10, n. 11 (7 giugno 2020): 3963. http://dx.doi.org/10.3390/app10113963.

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The volume hologram printer is useful for 3D display, because it is selective to the wavelength and be able to reconstruct with the natural illumination. There are many studies of a volume hologram printer been studied to output a volume hologram from a computer-generated hologram. The final volume hologram consists of tiled small holograms and the tiling manner often causes spilt lines which will have impact on image quality. With an intent to get rid of the split lines and improve the quality, fully overlapping printing was proposed recently. Each elemental hologram is overlapped both in vertical and horizontal directions by 50%. Then, the hologram is printed four times in each area and it makes the printing speed four times slower. For this case, partially overlapping printing is proposed in this paper to improve image quality with small effect in printing speed. For partial overlapping, a digital spatial filter is projected and added to every elemental hologram. Using the digital spatial filter, different partially overlapped holograms are calculated and reconstructed to compare to the non-overlapped ones. The simulation result shows that the overlapped one (10% in both vertical and horizontal) has much weaker gaps and black lines.

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Rosen, Joseph, Vijayakumar Anand, Mani Rai, Saswata Mukherjee e Angika Bulbul. "Review of 3D Imaging by Coded Aperture Correlation Holography (COACH)". Applied Sciences 9, n. 3 (12 febbraio 2019): 605. http://dx.doi.org/10.3390/app9030605.

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Coded aperture correlation holography (COACH) is a relatively new technique to record holograms of incoherently illuminated scenes. In this review, we survey the main milestones in the COACH topic from two main points of view. First, we review the prime architectures of optical hologram recorders in the family of COACH systems. Second, we discuss some of the key applications of these recorders in the field of imaging in general, and for 3D super-resolution imaging, partial aperture imaging, and seeing through scattering medium, in particular. We summarize this overview with a general perspective on this research topic and its prospective directions.

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Zheng, Huadong, Jianbin Hu, Chaojun Zhou e Xiaoxi Wang. "Computing 3D Phase-Type Holograms Based on Deep Learning Method". Photonics 8, n. 7 (15 luglio 2021): 280. http://dx.doi.org/10.3390/photonics8070280.

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Computer holography is a technology that use a mathematical model of optical holography to generate digital holograms. It has wide and promising applications in various areas, especially holographic display. However, traditional computational algorithms for generation of phase-type holograms based on iterative optimization have a built-in tradeoff between the calculating speed and accuracy, which severely limits the performance of computational holograms in advanced applications. Recently, several deep learning based computational methods for generating holograms have gained more and more attention. In this paper, a convolutional neural network for generation of multi-plane holograms and its training strategy is proposed using a multi-plane iterative angular spectrum algorithm (ASM). The well-trained network indicates an excellent ability to generate phase-only holograms for multi-plane input images and to reconstruct correct images in the corresponding depth plane. Numerical simulations and optical reconstructions show that the accuracy of this method is almost the same with traditional iterative methods but the computational time decreases dramatically. The result images show a high quality through analysis of the image performance indicators, e.g., peak signal-to-noise ratio (PSNR), structural similarity (SSIM) and contrast ratio. Finally, the effectiveness of the proposed method is verified through experimental investigations.

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Più fonti

Tesi sul tema "3D holograms"

Sansone, Enrico. "Study on the practical realization of a device able to generate an in-space 3D luminous image". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21052/.

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Gli ologrammi sono parte integrante della cultura pop a partire dagli anni 50, tanto che ad oggi sentirne parlare non desta più scalpore. Dal lato pratico, invece, solo negli ultimi anni sono state fatte ricerche approfondite con lo scopo di realizzarli. Fra i dispositivi attualmente in commercio, in pochi sono degni di nota e presentano numerose limitazioni, questo perché è molto difficile riuscire a progettare un sistema che permetta di illuminare dei punti specifici in uno spazio tridimensionale per lunghi periodi. In questa tesi si illustrano i principi di funzionamento ed il progetto per un nuovo dispositivo, diverso da quelli fino ad ora realizzati, che sfrutti il decadimento spontaneo di atomi di rubidio eccitati tramite due fasci laser opportunamente incrociati. Nel punto di incrocio si produce luce visibile a 420 nm. Con un opportuno sistema di specchi che muovono velocemente il punto di intersezione tra i due fasci è possibile realizzare un vero ologramma tridimensionale visibile da quasi ogni angolazione.

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Payne, Doug. "Simulating perceived 3D images replayed by computer generated holograms". Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/355.

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Chen, Jhen-Si. "Holographic 3D image display : layer-based method and coarse integrated holograms". Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708806.

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Seifi, Mozhdeh. "Signal processing methods for fast and accurate reconstruction of digital holograms". Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01004605.

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Techniques for fast, 3D, quantitative microscopy are of great interest in many fields. In this context, in-line digital holography has significant potential due to its relatively simple setup (lensless imaging), its three-dimensional character and its temporal resolution. The goal of this thesis is to improve existing hologram reconstruction techniques by employing an "inverse problems" approach. For applications of objects with parametric shapes, a greedy algorithm has been previously proposed which solves the (inherently ill-posed) inversion problem of reconstruction by maximizing the likelihood between a model of holographic patterns and the measured data. The first contribution of this thesis is to reduce the computational costs of this algorithm using a multi-resolution approach (FAST algorithm). For the second contribution, a "matching pursuit" type of pattern recognition approach is proposed for hologram reconstruction of volumes containing parametric objects, or non-parametric objects of a few shape classes. This method finds the closest set of diffraction patterns to the measured data using a diffraction pattern dictionary. The size of the dictionary is reduced by employing a truncated singular value decomposition to obtain a low cost algorithm. The third contribution of this thesis was carried out in collaboration with the laboratory of fluid mechanics and acoustics of Lyon (LMFA). The greedy algorithm is used in a real application: the reconstruction and tracking of free-falling, evaporating, ether droplets. In all the proposed methods, special attention has been paid to improvement of the accuracy of reconstruction as well as to reducing the computational costs and the number of parameters to be tuned by the user (so that the proposed algorithms are used with little or no supervision). A Matlab® toolbox (accessible on-line) has been developed as part of this thesis

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Jones, Richard. "Application of ultrafast lasers to photorefractive holography through turbid media". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298783.

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Uddman, Lindh Carl, e Johan Norberg. "Augmented reality with holograms for combat management systems : Performance limitations for sonar tracks in a 3D map, presented with Microsoft HoloLens". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209412.

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Technical advancements in 3D projection has recently made presentation of holographic images possible by using self-contained devices. Instead of using a screen to present objects, glasses like Microsoft HoloLens can render objects that appear as holograms around the user. SAAB Defence and Security are evaluating if this new technology can complement their command and control system 9LV Combat Management System. This degree project is a study of the technical possibilities and limitations of introducing holographic display of sonar tracks used for detecting submarines or sea mines. The project was started with a background study into what methods are available to render 3D underwater terrain. A basic hologram representing a map of littoral terrain was constructed and simulated sonar tracks from the command and control system was mapped into the terrain. Implementation of the application was done using the Unity 3D game engine that has built in support for the HoloLens. Performance evaluation was done using Unity3D profiler that is an extensive application evaluation tool that maintain overhead to a minimum. An evaluation of HoloLens usage onboard two different boats was done to conclude if the equipment can be used in the normal 9LV CMS operating environment. Results show that it is possible to successfully use holographic display for sonar tracks, but due to limited processing power of the HoloLens terrain detail will be reduced. Holograms are orientated by combining camera spatial mapping and an inertial measurement unit. Usage tests onboard a vessel indicates that holograms will unexpectedly move and the HoloLens will loose spatial mapping due to acceleration forces caused by seastate.
Tekniska framsteg inom presentation av 3D-objekt har nyligen möjliggjort användning av hologram presenterade med portabel utrustning. Istället för att använda en vanlig skärm kan glasögon, som Microsoft HoloLens, rendera objekt som användaren upplever i sin omgivning som hologram. SAAB Defence and Security utvärderar om den nya teknologin kan användas som ett komplement till deras ledningssystem 9LV Combat Management System. Det här examensarbetet är en studie av de tekniska möjligheter och begränsningar som finns för att bygga en applikation som visar sonar-information som ett hologram, främst att användas för ubåtsjakt och upptäckt av sjöminor. Projektet inleddes med en bakgrundsstudie om vilka metoder som finns tillgängliga för att rendera en 3D-karta av en havsbotten. En enkel applikation med en karta som föreställer en del av skärgården tas fram med simulerad sonar-information från ledningssystemet inlagt i kartan. Implementationen av applikationen gjordes med spelmotorn Unity3D som har inbyggt stöd för Microsoft HoloLens. Prestandautvärdering genomfördes genom att använda ett inbyggt profileringsverktyg i Unity3D som har liten påverkan på prestandan. Utvärdering av möjlig användningsmiljö gjordes genom att testa utrustningen ombord på två olika båtar för att avgöra om HoloLens kan användas i 9LV CMS normala operativa förhållanden. Resultaten visar att det är möjligt att använda holografisk visning för sonar-data men upplösningen av terrängen för kartan är något låg på grund av den begränsade beräkningskraften i Microsoft HoloLens. Hologram i Microsoft HoloLens orienteras genom att kombinera en djupseende kamera med en intern referensenhet. Användningstester ombord på båt visar på att vid accelerationer som uppkommer av sjöhävning tappar HoloLensen rumsuppfattningen tillfälligt och stoppar renderingen av hologrammet.

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Haist, Tobias. "3D-Linienraster für die optische Formaufzeichnung". [S.l.] : Universität Stuttgart , Fakultät Physik, 1996. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB7084240.

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Gilles, Antonin. "Fast hologram synthesis methods for realistic 3D visualization". Thesis, Rennes, INSA, 2016. http://www.theses.fr/2016ISAR0005/document.

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L’holographie est souvent considérée comme la technologie de visualisation 3D la plus prometteuse, puisqu'elle fournit l'illusion du relief la plus naturelle et la plus réaliste possible. Toutefois, pour trouver application dans le domaine de la visioconférence ou de la téléprésence, les méthodes de génération numérique d'hologrammes doivent produire des scènes réalistes avec une forte illusion de profondeur, et ce en temps réel. Cette thèse se situe dans ce contexte et est organisé en deux parties. Dans la première partie de ce travail, nous avons proposé deux algorithmes de synthèse d'hologrammes permettant de se rapprocher du temps réel. Tout d'abord, nous avons développé une méthode combinant deux approches complémentaires: les approches point-source et wave-field. Alors que les méthodes de l'état de l'art réduisent la complexité de calcul de ces deux approches indépendamment, notre méthode tire parti de chacune d'entre elles. De cette manière, le temps de calcul de l'hologramme a été réduit de plus de 65% par rapport aux méthodes point-source et wave-field conventionnelles. Deuxièmement, nous avons cherché à accélérer cette méthode hybride en supprimant les redondances temporelles entre les trames consécutives d'une vidéo 3D. Pour chaque image, l'algorithme détecte les changements dans la scène et met à jour l'hologramme des points affectés. Étant donné que seules de petites régions de l'hologramme sont mises à jour, la charge de calcul est considérablement réduite, permettant le calcul d’hologrammes couleur à 60 images par seconde. Dans la deuxième partie de ce travail, nous avons proposé deux algorithmes afin d'améliorer la qualité visuelle des scènes. Tout d'abord, nous avons perfectionné la méthode hybride pour tenir compte des occultations dans la scène. Pour cela, nous avons conçu une méthode efficace pour le calcul de l'occultation d'une onde lumineuse par un point. Cette méthode reproduit les occultations sans augmenter de manière significative le temps de calcul de la méthode hybride originale. Enfin, nous avons proposé une méthode pour le calcul d'un hologramme à partir de données multivue-plus-profondeur (MVD) avec prise en compte des réflexions spéculaires. Selon cette méthode, la géométrie de la scène est reconstruite à partir des données MVD sous la forme d'un nuage de points, ce qui permet de n'utiliser que quelques projections de la scène. En outre, afin de tenir compte de réflexions spéculaires, chaque point de la scène est considéré avoir une émission différente selon les directions. Enfin, la lumière émise par la scène est propagée dans le plan de l'hologramme. Les résultats expérimentaux montrent que cette méthode reproduit tous les indices de la profondeur et l'illumination précise de la scène avec une complexité de calcul réduite
Holography is often considered as the most promising 3D visualization technology, since it can produce the most realistic and natural depth illusion to the naked eye. However, in order to have application in the field of videoconferencing or telepresence systems, hologram synthesis methods should be able to produce realistic 3D scenes with strong depth illusion in real-time. This thesis falls within this context and is organized into two parts. In the first part of this work, we investigated two novel algorithms in order to get closer to real-time computation. First, we designed a fast hologram calculation method by combining two approaches which complement one another: the point-source and wave-field approaches. Whereas previously proposed methods reduced the computational complexity of these approaches independently, our method takes advantages from both of them. By this way, the hologram calculation time has been reduced by more than 65% compare to the conventional point-source and wave-field methods. Second, we further accelerated this hybrid method by removing temporal redundancies between consecutive frames of a 3D video. For each video frame, the algorithm detects changes in the scene and updates the hologram of only affected scene points. Since only small regions of the hologram are updated at each video frame, this method allows the computational burden to be dramatically reduced, enabling the computation of colorful video holograms at 60 frames per second. In the second part of this work, we proposed two algorithms in order to enhance the visual quality of displayed scenes. First, we improved the hybrid method to take into account occlusions between objects in the scene. To this end, we designed an efficient algorithm for light shielding between points and light waves. Experimental results revealed that this method provides occlusion effect without significantly increasing the hologram calculation time of the original hybrid method. Finally, we proposed a hologram computation method from Multiview-plus-depth (MVD) data with rendering of specular reflections. In this method, the 3D scene geometry is first reconstructed from the MVD data as a layered point-cloud, enabling the use of only a few perspective projections of the scene. Furthermore, in order to take into account specular reflections, each scene point is considered to emit light differently in all the directions. Finally, light scattered by the scene is numerically propagated towards the hologram plane in order to get the final hologram. Experimental results show that the proposed method is able to provide all the human depth cues and accurate shading of the scene with reduced computational complexity

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Lång, Magnus. "3D Teleconferencing : The construction of a fully functional, novel 3D Teleconferencing system". Thesis, Linköping University, Linköping University, The Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51466.

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This report summarizes the work done to develop a 3D teleconferencing system, which enables remote participants anywhere in the world to be scanned in 3D, transmitted and displayed on a constructed 3D display with correct vertical and horizontal parallax, correct eye contact and eye gaze. The main focus of this report is the development of this system and especially how to in an efﬁcient and general manner render to the novel 3D display. The 3D display is built out of modiﬁed commodity hardware and show a 3D scene for observers in up to 360 degrees around it and all heights. The result is a fully working 3D Teleconferencing system, resembling communication envisioned in movies such as holograms from Star Wars. The system transmits over the internet, at similar bandwidth requirements as concurrent 2D videoconferencing systems.

Project done at USC Institute for Creative Technologies, LA, USA. Presented at SIGGRAPH09.

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Song, Qiang. "Design of synthetic diffractive structures for 3D visualization applications and their fabrication by a novel parallel-write two-photon polymerization process". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0199.

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Les éléments optiques diffractifs (EOD) sont maintenant largement utilisés dans les applications universitaires et industrielles grâce à leurs caractéristiques ultra-minces et compactes et à leur très flexible manipulation des fronts d'ondes lumineuses. Malgré ces excellentes propriétés, la portée d'application des EOD est souvent limitée par le fait que la plupart des DOE sont conçus pour générer uniquement des motifs projetés en 2D, et plus important encore, pour être utilisés uniquement avec des sources laser monochromatiques, cohérentes, souvent collimatées. Les contraintes de coût et de sécurité oculaire des sources laser limitent fortement les applications de visualisation des EOD telles que les hologrammes de sécurité, et la nature 2D des motifs générés limite les applications de réalité virtuelle ou augmentée. Pour surmonter ces restrictions, cette thèse vise la conception et la fabrication de structures diffractives 3D sélectives en longueur d'onde qui peuvent produire un objet 3D "flottant" perçu à plusieurs angles de vue derrière le substrat EOD lorsqu'il est éclairé par des sources LED blanches facilement disponibles et bon marché. Dans une première approche, nous développons et validons expérimentalement une série de nouveaux algorithmes de conception pour des structures EOD conventionnelles, optiquement "minces" sous un éclairage incohérent et divergent ; d'abord pour projeter des motifs 2D, puis pour créer des images 2D virtuelles et enfin des motifs 3D virtuels. Dans un deuxième temps, nous exploitons les capacités des structures optiquement "épaisses" de type Bragg pour introduire une sélectivité spectrale (vers des modèles de sortie de couleur) et améliorer l'efficacité de la diffraction. Comme l'approximation des éléments minces n'est pas valable pour la conception de structures photoniques 3D optiquement épaisses, nous développons un algorithme d'optimisation des essaims de particules basé sur un modèle de diffraction rigoureux pour concevoir des structures diffractives synthétiques optiquement épaisses très innovantes. La fabrication rentable de ces structures micro et nano-photoniques entièrement 3D proposées est très difficile lorsqu'on utilise les techniques lithographiques traditionnelles actuelles qui sont généralement limitées, en pratique, à la fabrication de structures 2D ou 2,5D. À cette fin, le département d'optique de l'IMT Atlantique met actuellement au point un prototype avancé de photoplotter de polymérisation à deux photons massivement parallélisés (2PP) pour la fabrication de structures photoniques entièrement tridimensionnelles de grande surface. Nous présentons nos contributions à la conception et au développement des modules d'illumination critiques et de haute uniformité pour le nouveau prototype de photoplotteur 2PP. La recherche et le développement de cette thèse contribuent à l'élargissement des applications de l'EOD à des domaines actuellement inaccessibles. Les méthodes de conception développées peuvent également trouver des applications dans des domaines d'affichage holographique tels que la réalité augmentée automobile
Diffractive Optical Elements (DOEs) are now widely used in academic and industrial applications due to their ultrathin, compact characteristics and their highly flexible manipulation of light wave-fronts. Despite these excellent properties, the scope of DOE applications is often limited by the fact that most DOEs are designed to generate only 2D projected patterns, and even more importantly, for use only with monochromatic, coherent, often collimated, laser sources. The cost and eye safety constraints of laser sources severely restrict DOE visualisation applications such as security holograms, and the 2D nature of the generated patterns limits virtual or augmented reality applications. To overcome these restrictions, this thesis targets the design and fabrication of wavelength selective 3D diffractive structures which can produce a perceived multiple view-angle “floating” 3D object behind the DOE substrate when illuminated by readily available and cheap white LED sources. In an initial approach we develop and experimentally validate a series of novel design algorithms for conventional optically “thin” DOE structures under incoherent, divergent illumination; first to project 2D patterns, then to create virtual 2D images and finally virtual 3D patterns. In a second stage, we leverage the capacities of optically “thick”, Bragg-like structures to introduce spectral selectivity (towards colour output patterns) and improve diffraction. Since the thin element approximation is invalid when designing optically thick 3D photonic structures we develop a particle swarm optimization algorithm based on a rigorous diffraction model to design highly innovative optically thick synthetic diffractive structures. The cost-effective fabrication of such proposed fully 3Dmicro- and nano-photonics structures is highly challenging when using current traditional lithographic techniques which are generally limited, in practice, to the fabrication of 2D or 2.5D structures. To this end, an advanced prototype massively parallelized two-photon polymerization (2PP) photoplotter for the fabrication of large area fully 3D photonic structures is currently being developed by the IMT Atlantique Optics Department. We present our contributions to the design and development of the critical, high uniformity illumination modules for the new prototype 2PP photoplotter. The research and development in this thesis contributes to the broadening of DOE applications to fields which are currently inaccessible. The developed design methods can also find applications in holographic display fields such as automotive augmented reality

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Libri sul tema "3D holograms"

Matsushima, Kyoji. Introduction to Computer Holography: Creating Computer-Generated Holograms as the Ultimate 3D Image. Springer, 2020.

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Torok, Simon, e Paul Holper. Imagining the Future. CSIRO Publishing, 2016. http://dx.doi.org/10.1071/9781486302734.

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Flying through time and flying in cars. Living underwater and living forever. Robot servants. 3D printed food. Wouldn’t it be amazing if science fiction became science fact? We’re living in a rapidly changing world. Hardly a week passes without an exciting technological breakthrough. That’s the power of human innovation – it never stops happening. Inventors keep inventing. Get prepared for the fantastic future with this guide to the unbelievable and incredible inventions just over the horizon. Invisibility, instant transportation, holograms and lots of gadgets were once the dreams of science fiction … now they might become science fact! Imagining the future is the first step in arriving there. If you can dream it, perhaps one day you can invent it. Strap yourself in and get ready for the future! Imagining the Future is perfect for kids aged 9-13.

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Kama Xcitra: A sex guide with 3D hologram technology. [London]: Xcite Books, 2013.

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Capitoli di libri sul tema "3D holograms"

Escobar, Jesús Jaime Moreno, Oswaldo Morales Matamoros, Ricardo Tejeida Padilla e Juan Pablo Francisco Posadas Durán. "3D-Holograms in Real Time for Representing Virtual Scenarios". In Advances in Intelligent Systems and Computing, 284–302. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17795-9_20.

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Yamamoto, Kazuhiro, Yoshihiko Hayakawa, Norio Kobayashi, Yuji Kousuge, Mamoru Wakoh, Hiroshi Sekiguchi, Masashi Yakushiji e Allan G. Farman. "Tuned-Aperture Computed Tomography (TACT®) to assess impacted teeth using 2D slices and 3D pseudo-holograms". In CARS 2002 Computer Assisted Radiology and Surgery, 1117. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56168-9_266.

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Kim, Youbin, e Dong Yeong Lee. "3D Hologram Learning Kit Development for Elementary Education". In Learning and Collaboration Technologies. Human and Technology Ecosystems, 464–79. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50506-6_32.

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Dozono, Hiroshi, Asami Tanaka, Shinya Nishijima, Hiroshi Tsukizi e Masanori Nakakuni. "Mapping of the 3D Objects Using Computer Generated Hologram SOM". In Advances in Self-Organizing Maps, 348–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21566-7_35.

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Shimobaba, Tomoyoshi, David Blinder, Peter Schelkens, Yota Yamamoto, Ikuo Hoshi, Atsushi Shiraki, Takashi Kakue e Tomoyoshi Ito. "Deep-Learning-Based Dynamic Range Compression for 3D Scene Hologram". In Springer Proceedings in Physics, 41–44. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9259-1_10.

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"Conversion of Complex-Valued Holograms to Phase-Only Holograms". In Computer-Generated Phase-Only Holograms for 3D Displays, 113–46. Cambridge University Press, 2021. http://dx.doi.org/10.1017/9781316999172.005.

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Yaroslavsky, Leonid, e Jaakko Astola. "Computer-Generated Holograms and 3D Visual Communication". In Introduction to Digital Holography, 129–45. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805079610901010129.

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"Introduction to Digital Holography". In Computer-Generated Phase-Only Holograms for 3D Displays, 1–39. Cambridge University Press, 2021. http://dx.doi.org/10.1017/9781316999172.002.

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"Fast Methods for Computer-Generated Holography". In Computer-Generated Phase-Only Holograms for 3D Displays, 40–75. Cambridge University Press, 2021. http://dx.doi.org/10.1017/9781316999172.003.

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"Generation of Phase-Only Fresnel Hologram". In Computer-Generated Phase-Only Holograms for 3D Displays, 76–112. Cambridge University Press, 2021. http://dx.doi.org/10.1017/9781316999172.004.

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Atti di convegni sul tema "3D holograms"

Benini, Fabriciu A. V., Ben-Hur V. Borges e Luiz G. Neto. "Fresnel Holograms Generation Using Partitioned Holograms and Fast Cosine Transform". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/3d.2018.jm4a.31.

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Makey, Ghaith, Onur Tokel, Ahmet Turnali, Ihor Pavlov, Parviz Elahi, Özgün Yavuz e F. Ömer Ilday. "Holograms Deep Inside Silicon". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/3d.2016.jw4a.2.

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Benton, Stephen A. "Real-time computer-generated 3D holograms". In 16th Congress of the International Commission for Optics: Optics as a Key to High Technology. SPIE, 1993. http://dx.doi.org/10.1117/12.2308640.

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Dinc, Niyazi Ulas, Joowon Lim, Eirini Kakkava, Christophe Moser e Demetri Psaltis. "3D printed computer generated volume holograms". In Liquid Crystals XXIV, a cura di Iam Choon Khoo. SPIE, 2020. http://dx.doi.org/10.1117/12.2569398.

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Kong, Dezhao, Liangcai Cao, Hao Zhang, Song Zong e Guofan Jin. "Experimental interference encryption based on computergenerated holograms". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/3d.2016.jw4a.16.

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Leseberg, Detlef. "Computer-generated image holograms of 3D objects". In 15th Int'l Optics in Complex Sys. Garmisch, FRG, a cura di F. Lanzl, H. J. Preuss e G. Weigelt. SPIE, 1990. http://dx.doi.org/10.1117/12.22179.

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Xiong, Zhang, Hanchun Yin e Xiaobing Zhang. "Image process of 3D reconstruction from holograms". In Photonics China '96, a cura di Chung-Sheng Li, Robert L. Stevenson e LiWei Zhou. SPIE, 1996. http://dx.doi.org/10.1117/12.253391.

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Cui, Yao, Jianshe Ma, Ping Su e Tianfeng Wu. "A large-angle solar concentrator using volume holograms". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/3d.2018.jm4a.14.

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Kalenkov, S. G., e G. S. Kalenkov. "Digital holograms registration by means of resonant phase-shifting". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/3d.2020.jth2a.24.

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Shekhar, Ravi, G. Unnikrishnan e Naveen K. Nishchal. "Multiplexing Multiple Digital Holograms for Efficient Transmission and Recovery". In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/3d.2018.jm4a.33.

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