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Rozprawy doktorskie na temat „Light field images”

Autor: Grafiati

Data publikacji: 12 października 2024

Data aktualizacji: 31 lipca 2025

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1

Zhang, Zhengyu. "Quality Assessment of Light Field Images." Electronic Thesis or Diss., Rennes, INSA, 2024. http://www.theses.fr/2024ISAR0002.

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Les images de champs de lumière (LFI) suscitent un intérêt et une fascination remarquables en raison de leur importance croissante dans les applications immersives. Étant donné que les LFI peuvent être déformés à différentes étapes, de l'acquisition à la visualisation, l'évaluation de la qualité des images de champs de lumière (LFIQA) est d'une importance vitale pour surveiller les dégradations potentielles de la qualité des LFI.La première contribution (Chapitre 3) de ce travail se concentre sur le développement de deux métriques LFIQA sans référence (NR) fondées sur des caractéristiques ad-h

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Chiesa, Valeria. "Revisiting face processing with light field images." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS059.pdf.

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L'objectif principal de cette thèse est de présenter une technologie d'acquisition non conventionnelle, d'étudier les performances d'analyse du visage en utilisant des images collectées avec une caméra spéciale, de comparer les résultats avec ceux obtenus en élaborant des données à partir de dispositifs similaires et de démontrer le bénéfice apporté par l'utilisation de dispositifs modernes par rapport à des caméras standards utilisées en biométrie. Au début de la thèse, la littérature sur l'analyse du visage à l'aide de données "light field" a été étudiée. Le problème de la rareté des données

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Dricot, Antoine. "Light-field image and video compression for future immersive applications." Thesis, Paris, ENST, 2017. http://www.theses.fr/2017ENST0008/document.

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L’évolution des technologies vidéo permet des expériences de plus en plus immersives. Cependant, les technologies 3D actuelles sont encore très limitées et offrent des situations de visualisation qui ne sont ni confortables ni naturelles. La prochaine génération de technologies vidéo immersives apparait donc comme un défi technique majeur, en particulier avec la prometteuse approche light-field (LF). Le light-field représente tous les rayons lumineux dans une scène. De nouveaux dispositifs d’acquisition apparaissent, tels que des ensembles de caméras ou des appareils photo plénoptiques (basés

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Dricot, Antoine. "Light-field image and video compression for future immersive applications." Electronic Thesis or Diss., Paris, ENST, 2017. http://www.theses.fr/2017ENST0008.

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L’évolution des technologies vidéo permet des expériences de plus en plus immersives. Cependant, les technologies 3D actuelles sont encore très limitées et offrent des situations de visualisation qui ne sont ni confortables ni naturelles. La prochaine génération de technologies vidéo immersives apparait donc comme un défi technique majeur, en particulier avec la prometteuse approche light-field (LF). Le light-field représente tous les rayons lumineux dans une scène. De nouveaux dispositifs d’acquisition apparaissent, tels que des ensembles de caméras ou des appareils photo plénoptiques (basés

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McEwen, Bryce Adam. "Microscopic Light Field Particle Image Velocimetry." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3238.

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This work presents the development and analysis of a system that combines the concepts of light field microscopy and particle image velocimetry (PIV) to measure three-dimensional velocities within a microvolume. Rectanglar microchannels were fabricated with dimensions on the order of 350-950 micrometers using a photolithographic process and polydimethylsiloxane (PDMS). The flow was seeded with fluorescent particles and pumped through microchannels at Reynolds numbers ranging from 0.016 to 0.028. Flow at Reynolds numbers in the range of 0.02 to 0.03 was seeded with fluorescent particles and pum

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Souza, Wallace Bruno Silva de. "Transmissão progressiva de imagens sintetizadas de light field." reponame:Repositório Institucional da UnB, 2018. http://repositorio.unb.br/handle/10482/34206.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Ciência da Computação, 2018.<br>Esta proposta estabelece um método otimizado baseado em taxa-distorção para transmitir imagens sintetizadas de light field. Resumidamente, uma imagem light field pode ser interpretada como um dado quadridimensional (4D) que possui tanto resolução espacial, quanto resolução angular, sendo que cada subimagem bidimensional desse dado 4D é tido como uma determinada perspectiva, isto é, uma imagem de subabertura (SAI, do inglês Sub-Aperture Image). Este trabalho visa modi c

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Nieto, Grégoire. "Light field remote vision." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM051/document.

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Les champs de lumière ont attisé la curiosité durant ces dernières décennies. Capturés par une caméra plénoptique ou un ensemble de caméras, ils échantillonnent la fonction plénoptique qui informe sur la radiance de n'importe quel rayon lumineux traversant la scène observée. Les champs lumineux offrent de nombreuses applications en vision par ordinateur comme en infographie, de la reconstruction 3D à la segmentation, en passant par la synthèse de vue, l'inpainting ou encore le matting par exemple.Dans ce travail nous nous attelons au problème de reconstruction du champ de lumière dans le but d

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8

Hawary, Fatma. "Light field image compression and compressive acquisition." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S082.

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En capturant une scène à partir de plusieurs points de vue, un champ de lumière fournit une représentation riche de la géométrie de la scène, ce qui permet une variété de nouvelles applications de post-capture ainsi que des expériences immersives. L'objectif de cette thèse est d'étudier la compressibilité des contenus de type champ de lumière afin de proposer de nouvelles solutions pour une imagerie de champs lumière à plus haute résolution. Deux aspects principaux ont été étudiés à travers ce travail. Les performances en compression sur les champs lumière des schémas de codage actuels étant e

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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.

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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 render

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Baravdish, Gabriel. "GPU Accelerated Light Field Compression." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150558.

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This thesis presents a GPU accelerated method to compress light field or light field videos. The implementation is based on an earlier work of a full light field compression framework. The large amount of data storage by capturing light fields is a challenge to compress and we seek to accelerate the encoding part. We compress by projecting each data point onto a set of dictionaries and seek a sparse representation with the least error. An optimized greedy algorithm to suit computations on the GPU is presented. We benefit of the algorithm outline by encoding the data segmentally in parallel for

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11

Yang, Jason C. (Jason Chieh-Sheng) 1977. "A light field camera for image based rendering." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86575.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (leaves 54-55).<br>by Jason C. Yang.<br>M.Eng.

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Vorhies, John T. "Low-complexity Algorithms for Light Field Image Processing." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590771210097321.

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Unger, Jonas. "Incident Light Fields." Doctoral thesis, Linköpings universitet, Visuell informationsteknologi och applikationer, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16287.

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Image based lighting, (IBL), is a computer graphics technique for creating photorealistic renderings of synthetic objects such that they can be placed into real world scenes. IBL has been widely recognized and is today used in commercial production pipelines. However, the current techniques only use illumination captured at a single point in space. This means that traditional IBL cannot capture or recreate effects such as cast shadows, shafts of light or other important spatial variations in the illumination. Such lighting effects are, in many cases, artistically created or are there to emphas

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14

Tsai, Dorian Yu Peng. "Light-field features for robotic vision in the presence of refractive objects." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/192102/1/Dorian%20Yu%20Peng_Tsai_Thesis.pdf.

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Curved transparent objects are difficult for robots to perceive and this makes it difficult for robots to work with them. This thesis shows that multi-aperture or light-field cameras overcome this problem since they capture a set of dense and uniformly sampled views to capture multiple views of the scene. The advances constitute a critical step towards enabling robots to work more safely and reliably with everyday refractive objects.

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Tung, Yan Foo. "Testing and performance characterization of the split field polarimeter in the 3-5m̆ waveband /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FTung.pdf.

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Thesis (M.S. in Combat Systems Technology)--Naval Postgraduate School, December 2003.<br>Thesis advisor(s): Alfred W. Cooper, Gamani Karunasiri. Includes bibliographical references (p. 83-84). Also available online.

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Pendlebury, Jonathon Remy. "Light Field Imaging Applied to Reacting and Microscopic Flows." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5754.

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Light field imaging, specifically synthetic aperture (SA) refocusing is a method used to combine images from an array of cameras to generate a single image with a narrow depth of field that can be positioned arbitrarily throughout the volume under investigation. Creating a stack of narrow depth of field images at varying locations generates a focal stack that can be used to find the location of objects in three dimensions. SA refocusing is particularly useful when reconstructing particle fields that are then used to determine the movement of the fluid they are entrained in, and it can also be

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Zhao, Ping. "Low-Complexity Deep Learning-Based Light Field Image Quality Assessment." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25977.

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Light field image quality assessment (LF-IQA) has attracted increasing research interests due to the fast-growing demands for immersive media experience. The majority of existing LF-IQA metrics, however, heavily rely on high-complexity statistics-based feature extraction for the quality assessment task, which will be hardly sustainable in real-time applications or power-constrained consumer electronic devices in future real-life applications. In this research, a low-complexity Deep learning-based Light Field Image Quality Evaluator (DeLFIQE) is proposed to automatically and efficiently extra

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Unger, Jonas, Stefan Gustavson, Larsson Per, and Anders Ynnerman. "Free Form Incident Light Fields." Linköpings universitet, Visuell informationsteknologi och applikationer, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16286.

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This paper presents methods for photo-realistic rendering using strongly spatially variant illumination captured from real scenes. The illumination is captured along arbitrary paths in space using a high dynamic range, HDR, video camera system with position tracking. Light samples are rearranged into 4-D incident light fields (ILF) suitable for direct use as illumination in renderings. Analysis of the captured data allows for estimation of the shape, position and spatial and angular properties of light sources in the scene. The estimated light sources can be extracted from the large 4D data se

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Ang, Jason. "Offset Surface Light Fields." Thesis, University of Waterloo, 2003. http://hdl.handle.net/10012/1100.

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For producing realistic images, reflection is an important visual effect. Reflections of the environment are important not only for highly reflective objects, such as mirrors, but also for more common objects such as brushed metals and glossy plastics. Generating these reflections accurately at real-time rates for interactive applications, however, is a difficult problem. Previous works in this area have made assumptions that sacrifice accuracy in order to preserve interactivity. I will present an algorithm that tries to handle reflection accurately in the general case for real-

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Yeung, Henry Wing Fung. "Efficient Deep Neural Network Designs for High Dimensional and Large Volume Image Processing." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/24336.

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Over time, more advanced methods of imaging are being developed for capturing richer information from the scene. Such advancement leads to an increase in the spatial resolution, i.e. number of pixels in the width and height of the image, from the angular resolution, i.e. light rays from multiple angles, or spectral resolution, i.e. bands across the electromagnetic spectrum. As a result, the number of dimensions and volume per image increases significantly. Examples of such images are light field images and satellite images. Light field images, which capture the ray of light at each point of

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Stepanov, Milan. "Selected topics in learning-based coding for light field imaging." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG050.

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La tendance actuelle en matière de technologie d'imagerie est d'aller au-delà de la représentation 2D du monde capturée par une caméra conventionnelle. La technologie de champ lumineux, light field, nous permet de capturer des repères directionnels plus riches. Avec la disponibilité récente des caméras portables à champ lumineux, il est possible de capturer facilement une scène sous différentes perspectives en un seul temps d'exposition, permettant de nouvelles applications telles qu'un changement de perspective, la mise au point à différentes profondeurs de la scène et l'édition. profondeur d

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Gullapalli, Sai Krishna. "Wave-Digital FPGA Architectures of 4-D Depth Enhancement Filters for Real-Time Light Field Image Processing." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1574443263497981.

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Milnes, Thomas Bradford. "Arbitrarily-controllable programmable aperture light field cameras : design theory, and applications to image deconvolution & 3-dimensional scanning." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85232.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 125-128).<br>This thesis describes a new class of programmable-aperture light field cameras based on an all-digital, grayscale aperture. A number of prototypes utilizing this arbitrarily-controllable programmable aperture (ACPA) light field techn

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Johansson, Erik. "3D Reconstruction of Human Faces from Reflectance Fields." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2365.

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<p>Human viewers are extremely sensitive to the appearanceof peoples faces, which makes the rendering of realistic human faces a challenging problem. Techniques for doing this have continuously been invented and evolved since more than thirty years. </p><p>This thesis makes use of recent methods within the area of image based rendering, namely the acquisition of reflectance fields from human faces. The reflectance fields are used to synthesize and realistically render models of human faces. </p><p>A shape from shading technique, assuming that human skin adheres to the Phong model, has been use

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Ziegler, Matthias [Verfasser], Günther [Akademischer Betreuer] Greiner, and Günther [Gutachter] Greiner. "Advanced image processing for immersive media applications using sparse light-fields / Matthias Ziegler ; Gutachter: Günther Greiner ; Betreuer: Günther Greiner." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1228627576/34.

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Magalhães, Filipe Bento. "Capacitor MOS aplicado em sensor de imagem química." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-06072014-230841/.

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O desenvolvimento de sensores em sistemas para controle ambiental tem-se mostrado uma área de elevado interesse científico e técnico. Os principais desafios nesta área estão relacionados ao desenvolvimento de sensores com capacidade de detecção de várias substâncias. Neste contexto, os capacitores MOS apresentam-se como dispositivos versáteis para a geração de imagens químicas com potencial de detecção e classificação de diferentes substâncias a partir de apenas um único sensor. No presente trabalho, foi proposto um sensor MOS com um perfil geométrico de porta em forma de cata-vento composta p

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Revi, Frank. "Measurement of two-dimensional concentration fields of a glycol-based tracer aerosol using laser light sheet illumination and microcomputer video image acquisition and processing." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/69291.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1992.<br>Includes bibliographical references (leaves 48-49).<br>The use of a tracer aerosol with a bulk density close to that of air is a convenient way to study the dispersal of pollutants in ambient room air flow. Conventional point measurement techniques do not permit the rapid and accurate determination of the concentration fields produced by the injection of such a tracer into a volume of air. An instantaneous two dimensional distribution would aid in the characterization of flow and diffusion processes in the vo

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Carstens, Jacobus Everhardus. "Fast generation of digitally reconstructed radiographs for use in 2D-3D image registration." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1797.

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Reynoso, Pacheco Helen Carolina. "Construcción de la Imagen: El uso de la luz natural bajo la perspectiva de Emmanuel Lubezki en la película El Renacido." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654486.

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Este trabajo de investigación analiza el fenómeno comunicacional del estilo fotográfico de Emmanuel Lubezki a través de las aplicaciones narrativas y expresivas de la cámara en la película ‘‘El Renacido’’. Cabe mencionar que se analiza el trabajo de Lubezki partiendo de la luz como elemento fundamental de expresividad. De tal modo que se logra tener una presencia de la belleza panorámica a través de los paisajes naturales que modifican las actitudes receptivas y emocionales del espectador.<br>This research paper analyzes the communicational phenomenon of Emmanuel Lubezki photographic style thr

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Svoboda, Karel. "Fotografování s využitím světelného pole." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241965.

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The aim of this thesis is to explain terms like light field, plenoptic camera or digital lens. Also the goal is to explain the principle of rendering the resulting images with the option to select the plane of focus, depth of field, changes in perspective and partial change in the angle of the point of view. The main outputs of this thesis are scripts for rendering images from Lytro camera and the interactive application, which clearly demonstrates the principles of plenoptic sensing.

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Pamplona, Vitor Fernando. "Interactive measurements and tailored displays for optical aberrations of the human eye." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/87586.

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Esta tese descreve métodos interativos para estimar e compensar erros de refração (NETRA) e opacidades ópticas (CATRA) em sistemas de imageamento usando telas de campos de luz programáveis, de alta resolução e alto contraste. Os novos métodos para oftalmologia computacional descritos aqui podem avaliar câmeras e olhos se o usuário do sistema estiver consciente do modelo de interação. A solução combina elementos ópticos baratos, interfaces interativas e reconstrução computacional. Uma tela de campos de luz, posicionada perto do olho, cria objetos virtuais em profundidades pré-definidas através

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Verhack, Ruben [Verfasser], Peter [Akademischer Betreuer] Lambert, Thomas [Akademischer Betreuer] Sikora, et al. "Steered mixture-of-experts for image and light field representation, processing, and coding : a universal approach for immersive experiences of camera-captured scenes / Ruben Verhack ; Gutachter: Glenn van Wallendael, Klaus Obermeyer, Christine Guillemot, Jean-François Macq, Tim Wauters ; Peter Lambert, Thomas Sikora." Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1223981444/34.

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Lu, Heqi. "Echantillonage d'importance des sources de lumières réalistes." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0001/document.

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On peut atteindre des images réalistes par la simulation du transport lumineuse avec des méthodes de Monte-Carlo. La possibilité d’utiliser des sources de lumière réalistes pour synthétiser les images contribue grandement à leur réalisme physique. Parmi les modèles existants, ceux basés sur des cartes d’environnement ou des champs lumineuse sont attrayants en raison de leur capacité à capter fidèlement les effets de champs lointain et de champs proche, aussi bien que leur possibilité d’être acquis directement. Parce que ces sources lumineuses acquises ont des fréquences arbitraires et sont éve

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Vanhoey, Kenneth. "Traitement conjoint de la géométrie et de la radiance d'objets 3D numérisés." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAD005/document.

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Depuis quelques décennies, les communautés d'informatique graphique et de vision ont contribué à l'émergence de technologies permettant la numérisation d'objets 3D. Une demande grandissante pour ces technologies vient des acteurs de la culture, notamment pour l'archivage, l'étude à distance et la restauration d'objets du patrimoine culturel : statuettes, grottes et bâtiments par exemple. En plus de la géométrie, il peut être intéressant de numériser la photométrie avec plus ou moins de détail : simple texture (2D), champ de lumière (4D), SV-BRDF (6D), etc. Nous formulons des solutions concrète

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Nováček, Petr. "Moderní prostředky pro digitální snímání scény." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221292.

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The thesis composes conventional and modern methods for digital scene capturing. The target of the thesis is a comparison of CMOS with Bayer mask and Foveon X3 Merrill sensors followed by a design of algorithms for image fusion which can combine advantages of the both sensor types. The thesis starts with an introduction and a description of methods and processes leading to scene capturing. The next part deals with capturing a gallery of test images and with a comparison of both sensors based on the gallery images. Further there are algorithms designed for image fusion which can combine advanta

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Frugier, Pierre Antoine. "Quantification 3D d’une surface dynamique par lumière structurée en impulsion nanoseconde. Application à la physique des chocs, du millimètre au décimètre." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112129.

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La technique de reconstruction de forme par lumière structurée (ou projection de motifs) permet d’acquérir la topographie d’une surface objet avec une précision et un échantillonnage de points dense, de manière strictement non invasive. Pour ces raisons, elle fait depuis plusieurs années l’objet d’un fort intérêt. Les travaux présentés ici ont pour objectif d’adapter cette technique aux conditions sévères des expériences de physique des chocs : aspect monocoup, grande brièveté des phénomènes, diversité des échelles d’observation (de quelques millimètres au décimètre). Pour répondre à ces exige

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Wang, Neng-Chien, and 王能謙. "Image Deblurring Technologies for Large Images and Light Field Images." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/23708713883408629099.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>104<br>Image processing has been developed for a long time. This paper can be separated into two parts. We will introduce the proposed techniques of image deblurring at first. Then the proposed light field deblurring algorithm will be introduced. The literatures of image deblurring can be categorized into two classes: blind deconvolution and non-blind deconvolution. First, we try to improve the efficiency of non-blind deconvolution in ultra-high resolution images. The complexity of deblurring is raised in ultra-high resolution images. Therefore, we try to reduce the

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Chuang, Shih-Chung, and 莊士昌. "Image Rendering Techniques and Depth Recovery for Light field images." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56855697872267415454.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>103<br>After the first commercial hand-held plenoptic camera was presented by Ng in 2012, the applications and the research of plenoptic cameras were getting richer in recent years. The major difference between the plenoptic camera and the traditional camera is that the plenoptic camera can capture the angular information in the scene and adjust the tradeoff between the spatial resolution and the angular information. With the use of the plenoptic camera, the information we get from a single shot of a camera is enriched. By using the information, we can reconstruct t

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Huang, Wei-Hao, and 黃威豪. "Face Segmentation In Portrait Images by Light Field Camera." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/25433666517493577592.

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碩士<br>中興大學<br>通訊工程研究所<br>103<br>Digital Cameras become more popular in recent years, and portrait photography is one of their major applications. Due to its limitation of focusing on a single point and the capability of identifying only clearly focused faces, the digital camera can hardly identify all faces in the image. The light field camera, presented by the Lytro- company in 2012, has the capability of focusing on any point in an image. Since it has no face segmentation function yet, this research tries to use its special capability to enhance the face segmentation in the images. In our me

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Lourenço, Rui Miguel Leonel. "Structure tensor-based depth estimation from light field images." Master's thesis, 2019. http://hdl.handle.net/10400.8/3927.

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This thesis presents a novel framework for depth estimation from light eld images based on the use of the structure tensor. A study of prior knowledge introduces general concepts of depth estimation from light eld images. This is followed by a study of the state-of-the art, including a discussion of several distinct depth estimation methods and an explanation of the structure tensor and how it has been used to acquire depth estimation from a light eld image. The framework developed improves on two limitations of traditional structure tensor derived depth maps. In traditional approach

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Chang, Ruei-Yu, and 張瑞宇. "Fully Convolutional Networks Based Reflection Separation for Light Field Images." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/k6m8qh.

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碩士<br>國立中央大學<br>通訊工程學系<br>107<br>Existing reflection separation schemes designed for multi-view images cannot be applied to light filed images due to the dense light fields with narrow baselines. In order to improve accuracy of the reconstructed background (i.e., the transmitted layer), most light field data based reflection separation schemes estimate a disparity map before reflection separation. Different from previous work, this thesis uses the existing EPINET based on disparity estimation of light field image without reflection, and separates the mixed light field image of weak reflection.

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Tsai, Yu-Ju, and 蔡侑儒. "Estimate Disparity of Light Field Images by Deep Neural Network." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/k32675.

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碩士<br>國立臺灣大學<br>資訊工程學研究所<br>107<br>In this paper, we introduce a light field depth estimation method based on a convolutional neural network. Light field camera can capture the spatial and angular properties of light in a scene. By using this property, we can compute depth information from light field images. However, the narrow baseline in light-field cameras makes the depth estimation of light field difficult. Many approaches try to solve these limitations in the depth estimation of the light field, but there is some trade-off between the speed and the accuracy in these methods. We consider

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Chang, Po-Yi, and 張博一. "Depth Estimation Using Adaptive Support-Weight Approach for Light Field Images." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5d6h37.

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碩士<br>國立中央大學<br>通訊工程學系<br>106<br>Light field cameras acquire muti-view images using the microlens array. Due to the narrow baseline between multiple views, sub-pixel accuracy of the estimated disparity is expected. Adaptive support-weight approach is a local based disparity estimation method. Although several adaptive support-weight approach (ASW) based disparity estimation schemes for light field images have been proposed, they did not consider the problem of sub-pixel accuracy. Therefore, this thesis proposes to improve adaptive support-weight approach based depth estimation for light field

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Wang, Yen-Chang, and 王嚴璋. "Generating Label Map and Extending Depth of Field from Different Focus Images Obtained by Means of Light Field Camera." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/94835126278171932887.

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碩士<br>國立清華大學<br>電機工程學系<br>100<br>Recently, the invention of　hand-held light field camera raises a revolution in photography. We can record not only the intensity of light but also the direction of light by the light field camera. With the additional information, we could process many applications such as digital refocusing, moving observer, and depth estimation which can be utilized to computer vision, computer graphics, and machine vision. In this thesis, we mainly concentrate on the function of digital refocusing which can easily get series of images with different focal length. We design an

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Yang, Hao-Hsueh, and 楊浩學. "Depth Estimation Based on Segmentation, Superpixel Auto Adjustment and Local Matching Algorithm for Stereo Matching and Light Field Images." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/12781767897456096386.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>105<br>After the releasing of Plenoptic camera in November 2012, the research of light field camera is getting popular in recent years. The main difference between Plenoptic camera and traditional camera is that the angular information of light ray can be acquired by the former one. With one shot only, we can reconstruct the depth of scene and render the micro images into one final image from different views. We can also change the focal distance to make near or far objects clear. These are the appealing advantages of Plenoptic camera. Stereo matching is also a

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Medeiros, João Diogo Gameiro. "Depth extraction in 3D holoscopic images." Master's thesis, 2018. http://hdl.handle.net/10071/17860.

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Holoscopy is a technology that comes as an alternative to traditional methods of capturing images and viewing 3D content. A light field camera can be used for the capture process, which allows the storage of information regarding the direction all light rays, unlike the traditional cameras. With the saved information it is possible to estimate a depth map that can be used for areas such as robotic navigation or medicine. This dissertation proposes to improve an existing depth estimation algorithm by developing new processing mechanisms which provide a dynamic balancing between computationa

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Tavares, Paulo José da Silva. "Three-dimensional geometry characterization using structured light fields." Doctoral thesis, 2008. http://hdl.handle.net/10216/59466.

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Tavares, Paulo José da Silva. "Three-dimensional geometry characterization using structured light fields." Tese, 2008. http://hdl.handle.net/10216/59466.

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Lin, Ren Jie, and 林仁傑. "Achromatic metalens array for light field image." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/36sm3w.

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碩士<br>國立臺灣大學<br>應用物理研究所<br>106<br>Vision is the most important system for living creature to perceiving surrounding environmental information. Compared with a human eyes, the insect''s visual system is composed of an array of tiny eyes, also known as compound eyes. Such a visual system has a large field of view and the advantage of estimating the depth of the object. Such features have attracted human technology to try to develop similar optical imaging systems, such as light field cameras. The light field image records the position and direction information of light rays distributin

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CHIANG, TAI-I., and 姜太乙. "Face Recognition Based on Moment Light Field Image." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/c9dcr5.

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碩士<br>國立高雄應用科技大學<br>光電與通訊工程研究所<br>104<br>To model images of faces, it is important to have a framework of how the face can change in a moment. Faces could vary widely, but the changes can be broken down into two parts: variations in lighting and the expression across the face among individuals. In this thesis, face recognition system considering moment images is proposed to model faces under various lighting. The continuity equation is proposed to extract the first angular moments of the light field so as to construct views of different light sources for recognition. The method reduces the tim

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