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Relevant bibliographies by topics / Image artifact / Dissertations / Theses

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Dissertations / Theses on the topic 'Image artifact'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Yang, Weifang. "An image processing approach for motion artifact suppression in magnetic resonance imaging." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/MQ35028.pdf.

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Yiu, Yat-shun. "Improving the contrast resolution of synthetic aperture imaging motion artifact reduction based on interleaved data acquisition /." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B4327867X.

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Yiu, Yat-shun, and 姚溢訊. "Improving the contrast resolution of synthetic aperture imaging: motion artifact reduction based oninterleaved data acquisition." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B4327867X.

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Chongburee, Wachira. "Implementation of Iterative Reconstruction of Images from Multiple Bases Representations." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/35379.

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Usually, image compression techniques that use only one transform exhibit some poor properties. For instance, the Discrete Cosine Transform (DCT) cannot efficiently represent high frequency components, resulting in blurred images. The Multiple Bases Representation (MBR) compression technique, which uses two or more transforms, is found to be superior to the single transform techniques in terms of representation efficiency. However, some bits in the MBR representation are needed to track the basis information. The MBR image quality is deteriorated by discontinuities at block boundaries, as

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Riblett, Matthew J. "Motion-Induced Artifact Mitigation and Image Enhancement Strategies for Four-Dimensional Fan-Beam and Cone-Beam Computed Tomography." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5542.

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Four dimensional imaging has become part of the standard of care for diagnosing and treating non-small cell lung cancer. In radiotherapy applications 4D fan-beam computed tomography (4D-CT) and 4D cone-beam computed tomography (4D-CBCT) are two advanced imaging modalities that afford clinical practitioners knowledge of the underlying kinematics and structural dynamics of diseased tissues and provide insight into the effects of regular organ motion and the nature of tissue deformation over time. While these imaging techniques can facilitate the use of more targeted radiotherapies, issues surrou

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6

Meilinger, Manuel [Verfasser]. "Metal artifact reduction and image processing of cone-beam computed tomography data for mobile C-arm CT devices / Manuel Meilinger." Regensburg : Univ.-Verl. Regensburg, 2011. http://d-nb.info/1012922480/34.

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Manivannan, Niranchana. "Use of Multiple Imaging Views for Improving Image Quality in Small Animal MR Imaging Studies." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1436753010.

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Miao, Jun. "Optimization of Fast MR Imaging Technologies using the Case-PDM to Quantitatively Assess Image Quality." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1346966179.

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Ekobo, Akoa Brice. "Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT069/document.

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Ce manuscrit présente les travaux de recherche réalisés au cours de ma thèse, dont le but est de développer des algorithmes de correction d'erreurs dans un décodage numérique d'images et d'assurer un haut niveau de la qualité visuelle des images décodées. Nous avons utilisé des techniques d'analyse statistique pour détecter et dissimuler les artefacts. Une boucle de contrôle de la qualité est implémentée afin de surveiller et de corriger la qualité visuelle de l'image. Le manuscrit comprend six chapitres. Le premier chapitre présente les principales méthodes d'évaluation de la qualité des imag

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Tulloch, Janet H. "Image as artifact: A social-historical analysis of female figures with cups in the banquet scenes from the catacomb of SS. Marcellino e Pietro, Rome." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/6450.

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This study examines and interprets eight funerary banquet frescoes (wall-paintings) dating c. 280--320AD from the catacomb of SS. Marcellino e Pietro, Rome for visual evidence of women's roles in ritual in early Christian communities in the city of Rome. It pioneers the use of a ground-breaking socio-historical method known as "Visual Hermeneutics" (the term was coined by Dr. Margaret Miles in Image as Insight [1985]) on visual data from early Christian Funerary Art. The method, (1) challenges presuppositions often brought to the study of this visual data and (2) identifies preconditions for u

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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

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Nguyễn, Hoài Nam. "Méthodes et algorithmes de segmentation et déconvolution d'images pour l'analyse quantitative de Tissue Microarrays." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S104/document.

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Ce travail de thèse a pour objectif de développer les méthodes originales pour l'analyse quantitative des images de Tissue Microarrays (TMAs) acquises en fluorescence par des scanners dédiés. Nous avons proposé des contributions en traitement d'images portant sur la segmentation des objets d'intérêts (i.e. des échantillons de tissus sur la lame de TMA scannée), la correction des artefacts d'acquisition liés aux scanners en question ainsi que l'amélioration de la résolution spatiale des images acquises en tenant compte des modalités d'acquisition (imagerie en fluorescence) et la conception des

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Roman-Gonzalez, Avid. "Compression Based Analysis of Image Artifacts: Application to Satellite Images." Phd thesis, Telecom ParisTech, 2013. http://tel.archives-ouvertes.fr/tel-00935029.

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This thesis aims at an automatic detection of artifacts in optical satellite images such as aliasing, A/D conversion problems, striping, and compression noise; in fact, all blemishes that are unusual in an undistorted image. Artifact detection in Earth observation images becomes increasingly difficult when the resolution of the image improves. For images of low, medium or high resolution, the artifact signatures are sufficiently different from the useful signal, thus allowing their characterization as distortions; however, when the resolution improves, the artifacts have, in terms of signal th

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Kovalčík, Tomáš. "Neuroinformatika: metody kalibrace v multicentrické MR studii." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218769.

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Work deals with methods of calibration of multi-center study of magnetic resonance imaging. Magnetic resonance is the phenomenon of the substance in a magnetic field of induction B0 delivers energy in the form of RF pulse with the Larmor frequency and thus to excite particles to higher energy levels. Calibration can be performed using the distinctive and homogeneous RF phantoms. Furthermore, we can perform calibration using image registration. To calibrate the images by registering the work described in the classical linear (affine) and nonlinear. Listed below are the simulators, which are als

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Arici, Tarik. "Single and multi-frame video quality enhancement." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29722.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Yucel Altunbasak; Committee Member: Brani Vidakovic; Committee Member: Ghassan AlRegib; Committee Member: James Hamblen; Committee Member: Russ Mersereau. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Watson, Peter. "Scatter artifact correction in cone-beam CT images." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117080.

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Cone-beam computed tomography (CBCT) images suffer from poor image quality, in a large part due to scattered x-rays. In this work, a fast and accurate Monte Carlo based scatter correction algorithm was implemented on real CBCT data. A fast Monte Carlo simulation developed in the EGSnrc framework was used to transport photons through an uncorrected CBCT scan. From the simulation output, the contribution from both primary and scattered photons for each projection image was estimated. Using these estimates, a subtractive scatter correction was performed on the CBCT projection data. Implementation

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O'Sullivan, Patrick Dominic. "Image and artifice in early Greek literature : concepts of visual images from Homer to Gorgias." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625010.

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18

Fernandes, Thales Fernando Damasceno. "Friction-induced artifact in atomic force microscopy topographic images." Universidade Federal de Minas Gerais, 2014. http://hdl.handle.net/1843/BUOS-9PQHRG.

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In Contact Mode Atomic Force Microscopy (CM-AFM), a cantilever with a sharp tip on its end is employed to acquire topographic information. Such acquisition is normally made by monitoring the deflection of the cantilever when it is in contact with the surface being scanned and using deflection variations as a feedback signal to the control electronics in order to keep the deflection constant (also known as constant force imaging mode in the literature). However, there is a major problem with this approach since, in most cases, a constant force scanning is not possible: frictional forces, beside

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Vlad, Raluca Ioana. "Une méthode pour l'évaluation de la qualité des images 3D stéréoscopiques." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00925280.

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Dans le contexte d'un intérêt grandissant pour les systèmes stéréoscopiques, mais sans méthodes reproductible pour estimer leur qualité, notre travail propose une contribution à la meilleure compréhension des mécanismes de perception et de jugement humains relatifs au concept multi-dimensionnel de qualité d'image stéréoscopique. Dans cette optique, notre démarche s'est basée sur un certain nombre d'outils : nous avons proposé un cadre adapté afin de structurer le processus d'analyse de la qualité des images stéréoscopiques, nous avons implémenté dans notre laboratoire un système expérimental a

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Faridi, Imran Zafar. "Image Compression Using Bidirectional DCT to Remove Blocking Artifacts." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/cs_theses/9.

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Discrete Cosine Transform (DCT) is widely used transform in many areas of the current information age. It is used in signal compression such as voice recognition, shape recognition and also in FBI finger prints. DCT is the standard compression system used in JPEG format. The DCT quality deteriorates at low-bit compression rate. The deterioration is due to the blocking artifact inherent in block DCT. One of the successful attempts to reduce these blocking artifacts was conversion of Block-DCT into Line-DCT. In this thesis we will explore the Line-DCT and introduce a new form of line-DCT called

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Sementilli, Philip Joseph Jr. "Suppression of artifacts in super-resolved images." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186313.

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Super-resolution of imagery is an image restoration problem in which the goal is to recover attenuated spatial frequencies from diffraction-limited images. In this dissertation we consider the limits on super-resolution performance in terms of usable bandwidth of the restored frequency spectrum. Based on a characterization of the spectral extrapolation errors (viz. null objects), we derive an expression for an approximate bound on accurate bandwidth extension for the general class of super-resolution algorithms that incorporate a-priori assumptions of a non-negative, space-limited object. For

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Huang, Ben. "Removing Textured Artifacts from Digital Photos Using Spatial Frequency Filtering." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/148.

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An abstract of the thesis of Ben Huang for the Master of Science in Electric and Computer Science presented [August 12nd, 2010]. Title: Removing textured artifacts from digital photos by using spatial frequency filtering Virtually all image processing is now done with digital images. These images, captured with digital cameras, can be readily processed with various types of editing software to serve a multitude of personal and commercial purposes. But not all images are directly captured and even of those that are directly captured many are not of sufficiently high quality. Digital images are

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Lack, Lindsey A. "Using the bootstrap concept to build an adaptable and compact subversion artifice." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FLack.pdf.

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Thesis (M.S. in Computer Science)--Naval Postgraduate School, June 2003.<br>Thesis advisor(s): Cynthia E. Irvine, Roger R. Schell. Includes bibliographical references (p. 69-71). Also available online.

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Bodily, Mark L. "Residential Mobility of Paleoarchaic and Early Archaic Occupants at North Creek Shelter (42GA5863): An Analysis of Chipped Stone Artifacts." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2842.pdf.

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Oskin, Neva Maude. "Reduction of physiological noise artifacts in fMRI images with dual correction /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Motevakel, Amir. "Artifacts handling and DBS electrodes localization in the CT/MRI brain images." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-216985.

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In the DBS surgical treatment the location of the electrodes has direct influence on the success rate of treatment. Considering the fact that MRI imaging is not compatible with metal, post-operative CT images should be used to locate the electrodes on pre-operative MRI images which contain information about soft tissues. It is impossible to locate them directly since the area around the electrodes on the CT image has been corrupted due to the blockage of x-ray by them. This work attempts to precisely estimate the position of the DBS electrodes inside the brain by means of images gathered fr

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Yazdy, Farzad Eskandarzadeh. "A study of motion artifacts seen on X-ray computerized tomography images." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47316.

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Kiehl, Zachary Adam. "Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954.

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Salahieh, Basel, Jeffrey J. Rodriguez, Sean Stetson, and Rongguang Liang. "Single-image full-focus reconstruction using depth-based deconvolution." SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2016. http://hdl.handle.net/10150/624372.

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In contrast with traditional extended depth-of-field approaches, we propose a depth-based deconvolution technique that realizes the depth-variant nature of the point spread function of an ordinary fixed-focus camera. The developed technique brings a single blurred image to focus at different depth planes which can be stitched together based on a depth map to output a full-focus image. Strategies to suppress the deconvolution's ringing artifacts are implemented on three levels: block tiling to eliminate boundary artifacts, reference maps to reduce ringing initiated by sharp edges, and depth-bas

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Zhu, Mengchen. "Real-time B-mode ultrasound image simulation and artifacts modelling of needles and brachytherapy seeds." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12611.

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The training of ultrasound guided interventional procedures could benefit from ultrasound simulators that synthesize realistic-looking B-mode images of tissue and interventional tools, such as the needle. For a prostate brachytherapy simulator in particular, both the needle and seed images need to be synthesized. In this thesis, we propose an interpolation-based method for simulating needle and seed B-mode images in real time. We parametrize a needle or a seed B-mode image as a function of its position and orientation. We collect needle and seed images under various spatial configurations

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Chandu, Kartheek. "Automatic image registration and defect identification of a class of structural artifacts in printed documents /." Online version of thesis, 2008. http://hdl.handle.net/1850/7761.

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Rountree, Janet, and n/a. "A framework for virtual artifacts : digital images as teaching tools in Classical art." University of Otago. Department of Information Science, 2005. http://adt.otago.ac.nz./public/adt-NZDU20060809.112225.

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This thesis explores the problem of how to present digital images of ancient artifacts in a manner that supports the task of visual analysis. The real object presents the "truth": exact scale, colour, and fine details. An original work of art provides the viewer with the opportunity to react directly with the object, is closest to the impact intended by the artist, and provides a tangible physical link with the past. Digital images limit and alter the experience of a work of art (1) with regard to the amount of data available (resolution), and (2) through the interpretation of the object by

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Tamkin, John M. "A Study of Image Artifacts Caused By Structured Mid-spatial Frequency Fabrication Errors on Optical Surfaces." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194928.

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Aspheric and freeform surfaces are becoming more common as optical designs become more sophisticated and new generations of fabrication tools reduce cost. Unlike spherical surfaces, these surfaces are fabricated with processes that leave a signature or "structure" that is primarily in the mid-spatial frequency region. Tolerancing aspheric and freeform surfaces requires attention to both surface form and structured mid-spatial frequency fabrication errors. These structured surface errors are shown to create image artifacts such as ghosts, and ripples in the MTF profile. Spatial frequencies beyo

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Silva, Fernando Penteado Lopes da. "Interferência dos artefatos de imagem causados por acessórios ortodônticos metálicos em sobreposições de imagens de TCFC." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23151/tde-14092012-160914/.

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O objetivo deste estudo foi avaliar, de forma quantitativa e qualitativa, se artefatos de imagem causados por acessórios ortodônticos metálicos interferem em sobreposições tridimensionais (3D) de imagens de Tomografia Computadorizada de Feixe Cônico (TCFC). Dez crânios secos humanos foram submetidos a três aquisições tomográficas: sem acessórios ortodônticos (T1), com braquetes e tubos ortodônticos de aço inoxidável colados às superfícies vestibulares dos dentes superiores e inferiores (T2), e com fios ortodônticos de aço inoxidável inseridos nas canaletas dos referidos acessórios (T3). Os arq

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Shao, Wei. "Improving functional avoidance radiation therapy by image registration." Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/7031.

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Radiation therapy (RT) is commonly used to treat patients with lung cancer. One of the limitations of RT is that irradiation of the surrounding healthy lung tissues during RT may cause damage to the lungs. Radiation-induced pulmonary toxicity may be mitigated by minimizing doses to high-function lung tissues, which we refer to as functional avoidance RT. Lung function can be computed by image registration of treatment planning four-dimensional computed tomography (4DCT), which we refer to as CT ventilation imaging. However, the accuracy of functional avoidance RT is limited by lung function im

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FERRO, ANDREW F. "DEFECTIVE PIXEL CORRECTION AND RESTORATION IN STARING REMOTE SENSOR FOCAL PLANE ARRAYS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132075897.

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Sogabe, Maina. "Restored interlaced volumetric imaging increases image quality and scanning speed during intravital imaging in living mice." Kyoto University, 2020. http://hdl.handle.net/2433/253212.

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Cordeiro, Rosângela Lannes Couto. "O jornal eletrônico Educação & Imagem: espaço tempo de tessitura de conhecimentos através de práticas de professores com imagens e narrativas." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3588.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Este trabalho pesquisou os usos do Jornal Eletrônico Educação & Imagem, feitos para e por professores da rede pública. As práticas narradas e as imagens trazidas pelos docentes, que são usuários do jornal, nos possibilitou refletir sobre os currículos e os conhecimentos que têm sido tecidos cotidianamente. Para analisar as narrativas e as imagens presentes nos artigos escritos pelos professores foram pesquisados os editoriais redigidos por cada grupo de pesquisa, que

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To, Johan, and Oleg Stevanovic. "How durable are photostimulable storage phosphor plates? - An experimental study concerning wear and image quality." Thesis, Malmö universitet, Odontologiska fakulteten (OD), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19913.

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Syfte: Att ta reda på hur lång livslängd en bildplatta har avseende slitage och bildkvalité.Material och metod: Tre fabriksnya bildplattor användes för att undersöka hur en enskild faktor i arbetsgången för bildgenerering påverkar bildkvalitén. Den första plattan exponerades och skannades 300 gånger. Platta nummer två användes för att undersöka effekten av totalt 300 av- och påtagningar i en frigolithållare, och platta tre användes för motsvarande test av en plasthållare. Exponering skedde utan patient och mot en neutral bakgrund. För samtliga plattor togs i initialskedet en referensbild, och

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Ferradans, Ramonde Sira. "Color image processing problems in digital photography." Doctoral thesis, Universitat Pompeu Fabra, 2011. http://hdl.handle.net/10803/51297.

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In this thesis, we discuss three image processing topics: High Dynamic Range (HDR) image creation in scenes with motion, Tone Mapping (TM), and Demosaicking. The first part of this thesis focuses on the creation of HDR images using gradient fusion techniques, and proposes a method that deals with motion and avoids bleeding and ghost artifacts. In the second part, we tackle the TM problem, whose goal is to produce a low dynamic range picture from an HDR image that reproduces the sensation of an observer in the scene. We review the perceptual principles that we find important for TM purpos

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Raud, Charlie. "How post-processing effects imitating camera artifacts affect the perceived realism and aesthetics of digital game graphics." Thesis, Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-34888.

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This study investigates how post-processing effects affect the realism and aesthetics of digital game graphics. Four focus groups explored a digital game environment and were exposed to various post-processing effects. During qualitative interviews these focus groups were asked questions about their experience and preferences and the results were analysed. The results can illustrate some of the different pros and cons with these popular post-processing effects and this could help graphical artists and game developers in the future to use this tool (post-processing effects) as effectively as po

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Chagas, Claudia Regina Ribeiro Pinheiro das. "Mulheres negras - tecendo identidades com cabelos e artefatos culturais: uma questão para os currículos." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5922.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Minha tese teve como base a busca de imagens de mulheres negras, para tentar contar uma história, aquela que aparece em álbuns e histórias para jovens e crianças. Essas imagens me indicam possibilidades para a aplicação da Lei n 10.639/3. Nesses espaçostempos tão plurais, repletos de cores, identidades e significados podemos trabalhar de uma maneira simples seguindo um currículo único? A tese principal da minha pesquisa é buscar entender a importância dessas publicaçõ

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Ambrosio, Jeanie. "Mirror Images: Penelope Umbrico’s Mirrors (from Home Décor Catalogs and Websites)." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7466.

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As the artwork’s title suggests, Penelope Umbrico’s "Mirrors (from Home Décor Catalogs and Websites)" (2001-2011), are photographs of mirrors that Umbrico has appropriated from print and web based home décor advertisements like those from Pottery Barn or West Elm. The mirrors in these advertisements reflect the photo shoot constructed for the ad, often showing plants or light filled windows empty of people. To print the "Mirrors," Umbrico first applies a layer of white-out to everything in the advertisement except for the mirror and then scans the home décor catalog. In the case of the web-ba

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Queiroz, Polyane Mazucatto 1991. "Influência da ferramenta de redução de artefato metálico na qualidade de imagens de TCFC = Influence of metal artefact reduction tool in quality of CBCT images." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290661.

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Orientador: Deborah Queiroz de Freitas França<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-28T02:05:09Z (GMT). No. of bitstreams: 1 Queiroz_PolyaneMazucatto_M.pdf: 2757992 bytes, checksum: 06e73a8b08ccb2c9d71f5790996c28cb (MD5) Previous issue date: 2015<br>Resumo: Materiais de alta densidade física e alto número atômico quando presentes no objeto escaneado podem resultar em artefato nas imagens tomográficas. O artefato compromete a qualidade da imagem tomográfica, podendo inviabilizar o uso dessa

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SOUZA, Rafaella Maria Silva de. "Influência Dos Materiais Endodônticos na Produção de Artefatos de Imagem em Tomografia Computadorizada de Feixe Cônico." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17148.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-06-27T12:45:42Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Rafaella maria Silva de Souza.pdf: 1989713 bytes, checksum: cd83e58aaa8eb66c26381019b48510e8 (MD5)<br>Made available in DSpace on 2016-06-27T12:45:42Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Rafaella maria Silva de Souza.pdf: 1989713 bytes, checksum: cd83e58aaa8eb66c26381019b48510e8 (MD5) Previous issue date: 2015-02-2

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Durán, César Augusto Arias. "Estudo do uso de cinemetria para a análise do deslocamento de maciço em obras subterrâneas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/110111.

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As escavações subterrâneas têm estado sempre afetadas pelas condições dos maciços, os quais apresentam diferentes características e comportamentos frente a deformações ocasionadas após a escavação de uma galeria ou túnel. Em virtude disto, torna-se necessário uma análise dos parâmetros que permitam estabelecer as condições de segurança do túnel e propõe-se o uso de um sistema estéreo de rastreamento ótico para analisar o deslocamento de artefatos (conjunto de marcadores) instalados sobre o contorno das faces do túnel, a fim de detectarem-se deslocamentos do maciço em pontos estabelecidos com p

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Paz, Felipe Rodrigo Contri. "Cultura visual e museus escolares : representações raciais no museu Lassalista (Canoas, RS, 1925-1945)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/131867.

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A seguinte pesquisa abordará o museu do antigo Instituto São José e suas imagensartefatos para o ensino dos tipos raciais humanos. Em levantamento realizado em museus e acervos localizados em espaços escolares na Região Metropolitana de Porto Alegre verificou-se no acervo da instituição Lassalista localizada em Canoas, a presença de bustos de gesso, representações dos diferentes tipos humanos. A partir deste dado empírico, algumas inquietações surgem em relação aos usos pedagógicos destas cabeças raciais e de como eram utilizadas no ensino. No momento do surgimento dos museus escolares no inte

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Le, roy Julien. "Optimisation des explorations tomodensitométriques des artères coronaires chez l’enfant atteint de cardiopathie congénitale." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTT058.

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L’angioscanner des artères coronaires est utilisé de façon croissante chez l’enfant dans le diagnostic, le suivi, et les bilans pré- et post-chirurgicaux des pathologies à risque d’atteinte coronaire, et plus particulièrement dans certaines cardiopathies congénitales. Son utilisation en pédiatrie reste cependant limitée par la présence d’artefacts de mouvements cardiaques, dégradant la qualité d’image et entravant potentiellement le diagnostic, ainsi que par le caractère irradiant de l’examen, et le risque de cancer radio-induit associé à prendre en considération dans cette population pédiatri

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Víteček, Jiří. "Redukce kovových artefaktů v CT datech se submikronovým rozlišením." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400977.

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This diploma thesis deals with reduction of metal artifacts in CT data with submicron resolution. The first part of this thesis briefly describes x-ray computed tomography followed by the description of artifacts of tomographic images and existing approaches of the reduction of metal artifacts. In the second part proposed methods of reduction of metal artifacts and their implementation in Matlab programming environment are described. Finally functionality of algorithms is tested on a newly created database and the results are compared, evaluated and discussed.

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Svoboda, Pavel. "Restaurace obrazu konvolučními neuronovými sítěmi." Doctoral thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-412577.

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Tématem práce je použití konvolučních neuronových sítí pro obecnou restauraci obrazu. Ta se typicky provádí za pomoci specializovaných metod pro konkrétní typ poškození. Model konvoluční sítě zde představuje jednotný přístup, který je aplikován na dva různé typy degradace obrazu, pohybem rozmazané snímky registračních značek a artefakty vznikající vysokou kompresí. Na modely konvolučních sítí je nahlíženo ze dvou úhlů. A to jak dobře si konvoluční sítě vedou v porovnání se současnými metodami pro restauraci konkrétního typu poškození a jak velký rozsah poškození je právě jeden model ještě scho

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