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Proceedings Paper

Layered coding system for very low bitrate videophone
Author(s): Tao Xie; Yun He; Chengjian Weng; Yujin Zhang; Chongxi Feng
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Paper Abstract

This paper presents a layered video-coding scheme for very low bit rate videophone. The lower two layers of this scheme are compatible with ITU-T H.263 in order to be compatible with other schemes. The first layer is normal H.263 without a priori knowledge of the image content, which is robust to image content. The second layer introduces the typical head- shoulder assumption, and provides subjectively improved quality of reconstructed image. The third layer is based on the same model as layer two, but further improves the subjective quality by employing the shape information of the interested objects. Manipulation functionality is supported in the third layer. When the typical head-shoulder hypothesis is true, the coding scheme can upgrade its coding layer to obtain better subjective quality. On the other hand, the coding scheme can withdraw to robust lower layers when the a priori knowledge is not available In this paper, a novel motion estimation criterion is introduced which can be integrated into most of present strategies to improve the overall performance. A B-spline approach is introduced in this paper to encode the object contour instead of chain code.

Paper Details

Date Published: 9 January 1998
PDF: 7 pages
Proc. SPIE 3309, Visual Communications and Image Processing '98, (9 January 1998); doi: 10.1117/12.298370
Show Author Affiliations
Tao Xie, Tsinghua Univ. (China)
Yun He, Tsinghua Univ. (China)
Chengjian Weng, Tsinghua Univ. (China)
Yujin Zhang, Tsinghua Univ. (China)
Chongxi Feng, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 3309:
Visual Communications and Image Processing '98
Sarah A. Rajala; Majid Rabbani, Editor(s)

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