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Proceedings Paper

An object-based compression system for a class of dynamic image-based representations
Author(s): Qing Wu; King-To Ng; Shing-Chow Chan; Heung-Yeung Shum
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Paper Abstract

This paper proposes a new object-based compression system for a class of dynamic image-based representations called plenoptic videos (PVs). PVs are simplified dynamic light fields, where the videos are taken at regularly spaced locations along line segments instead of a 2-D plane. The proposed system employs an object-based approach, where objects at different depth values are segmented to improve the rendering quality as in the pop-up light fields. Furthermore, by coding the plenoptic video at the object level, desirable functionalities such as scalability of contents, error resilience, and interactivity with individual IBR objects can be achieved. Besides supporting the coding of the texture and binary shape maps for IBR objects with arbitrary shapes, the proposed system also supports the coding of gray-scale alpha maps as well as geometry information in the form of depth maps to respectively facilitate the matting and rendering of the IBR objects. To improve the coding performance, the proposed compression system exploits both the temporal redundancy and spatial redundancy among the video object streams in the PV by employing disparity-compensated prediction or spatial prediction in its texture, shape and depth coding processes. To demonstrate the principle and effectiveness of the proposed system, a multiple video camera system was built and experimental results show that considerable improvements in coding performance are obtained for both synthetic scene and real scene, while supporting the stated object-based functionalities.

Paper Details

Date Published: 24 June 2005
PDF: 9 pages
Proc. SPIE 5960, Visual Communications and Image Processing 2005, 59603S (24 June 2005); doi: 10.1117/12.632666
Show Author Affiliations
Qing Wu, The Univ. of Hong Kong (Hong Kong China)
King-To Ng, The Univ. of Hong Kong (Hong Kong China)
Shing-Chow Chan, The Univ. of Hong Kong (Hong Kong China)
Heung-Yeung Shum, Microsoft Research Asia (China)

Published in SPIE Proceedings Vol. 5960:
Visual Communications and Image Processing 2005
Shipeng Li; Fernando Pereira; Heung-Yeung Shum; Andrew G. Tescher, Editor(s)

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