Light Field Sampling

Author: Cha Zhang
Editor: Morgan & Claypool Publishers
ISBN: 1598290762
File Size: 31,89 MB
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Light field is one of the most representative image-based rendering techniques that generate novel virtual views from images instead of 3D models. The light field capture and rendering process can be considered as a procedure of sampling the light rays in the space and interpolating those in novel views. As a result, light field can be studied as a high-dimensional signal sampling problem, which has attracted a lot of research interest and become a convergence point between computer graphics and signal processing, and even computer vision. This lecture focuses on answering two questions regarding light field sampling, namely how many images are needed for a light field, and if such number is limited, where we should capture them. The book can be divided into three parts. First, we give a complete analysis on uniform sampling of IBR data. By introducing the surface plenoptic function, we are able to analyze the Fourier spectrum of non-Lambertian and occluded scenes. Given the spectrum, we also apply the generalized sampling theorem on the IBR data, which results in better rendering quality than rectangular sampling for complex scenes. Such uniform sampling analysis provides general guidelines on how the images in IBR should be taken. For instance, it shows that non-Lambertian and occluded scenes often require a higher sampling rate. Next, we describe a very general sampling framework named freeform sampling. Freeform sampling handles three kinds of problems: sample reduction, minimum sampling rate to meet an error requirement, and minimization of reconstruction error given a fixed number of samples. When the to-be-reconstructed function values are unknown, freeform sampling becomes active sampling. Algorithms of active sampling are developed for light field and show better results than the traditional uniform sampling approach. Third, we present a self-reconfigurable camera array that we developed, which features a very efficient algorithm for real-time rendering and the ability of automatically reconfiguring the cameras to improve the rendering quality. Both are based on active sampling. Our camera array is able to render dynamic scenes interactively at high quality. To the best of our knowledge, it is the first camera array that can reconfigure the camera positions automatically.

Report Of Investigations

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File Size: 26,84 MB
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Video Based Rendering

Author: Marcus A. Magnor
Editor: A K Peters/CRC Press
ISBN: 9781568812441
File Size: 76,63 MB
Format: PDF, ePub
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Driven by consumer-market applications that enjoy steadily increasing economic importance, graphics hardware and rendering algorithms are a central focus of computer graphics research. Video-based rendering is an approach that aims to overcome the current bottleneck in the time-consuming modeling process and has applications in areas such as computer games, special effects, and interactive TV. This book offers an in-depth introduction to video-based rendering, a rapidly developing new interdisciplinary topic employing techniques from computer graphics, computer vision, and telecommunication engineering. Providing an overview of the state-of-the-art of video-based rendering and details of the fundamental VBR algorithms, the author discusses the advantages, the potential, as well as the limitations of the approach in the context of different application scenarios.

Medical Imaging

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ISBN:
File Size: 12,94 MB
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Pneumoconiosis Abstracts

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File Size: 34,88 MB
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10th Pacific Conference On Computer Graphics And Applications

Author: Qing hua da xue (Beijing, China)
Editor: IEEE
ISBN: 9780769517841
File Size: 73,38 MB
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Papers from an October 2002 conference reflect recent work in problems, solutions, and technology in computer graphics, in the areas of illumination and lighting, facial expression and behavior, 3D acquisition and IBR, texture and appearance, hardware and efficient rendering, geometry and shape, mes

The Polarization Of The Near Asymptotic Light Field In Sea Water

Author: George Francis Beardsley
Editor:
ISBN:
File Size: 68,30 MB
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Vis 2002

Author: Robert J. Moorhead
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ISBN:
File Size: 54,81 MB
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Nanobiophotonics And Biomedical Applications

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File Size: 29,16 MB
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Microscopic Examination For The Operation And Control Of Wastewater Treatment Plants

Author: N. J. Horan
Editor:
ISBN:
File Size: 76,65 MB
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Certain types of waste are plagued by filamentous bacteria. Rountine monitoring of the activates sludge floc can observe the build up of such bacteria which can indicate the onset of bulking or foaming, and can suggest control strategies to minimise the impact of such an incident. Microscopic examination of the sludge is a valuable tool for efficient water plant operation, and most plants have microscopes for this purpose. Most plant operators, however, do not have the biological background to use this facility to its full potential. If a few basic rules are followed, a lot of valuable information can be quickly obtained. This handbook shows how to carry out a monitoring programme, interpret the results, and take necessary steps to minimise the impact of a bulking incident.

Phytoplankton Primary Production And Related Limnological Data For Lakes And Channels In The Mackenzie Delta And Lakes On The Tuktoyaktuk Peninsula N W T

Author: Everett J. Fee
Editor:
ISBN:
File Size: 48,21 MB
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Transactions

Author: Mining, Geological, and Metallurgical Institute of India
Editor:
ISBN:
File Size: 80,23 MB
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Proceedings

Author: International Association of Theoretical and Applied Limnology
Editor:
ISBN: 9783510540624
File Size: 73,62 MB
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Wave Optical Systems Engineering

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File Size: 51,57 MB
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Initial Reports Of The Deep Sea Drilling Project

Author: Scripps Institution of Oceanography
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ISBN:
File Size: 13,17 MB
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National Safety News

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File Size: 10,32 MB
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Vol. 73- include the section ASSE journal, 1956- .

Acta Polytechnica Scandinavica

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File Size: 30,41 MB
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