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Proceedings Paper

Content-based rate control for low-bit-rate video applications
Author(s): Kewei Shi; Anni Cai; Jingao Sun
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Paper Abstract

In low bit-rate or very low bit-rate video applications, such as videophone and video conferencing, it is difficult for traditional methods to gain a satisfactory image quality. They often suffer from some shortcomings: images with artifacts caused by limited bandwidth and motion discontinuity caused by frame skipping when bit-streams are transmitted through a fixed rate channel in low-delay applications. To attack the two problems above, we propose a content-based rate control method for videophone and video conferencing applications. Our work is focused on three aspects: analysis of bit-streams in low bit-rate video applications, content-based bit allocation to facial areas and background, and low-delay rate control in object-layer. Experiments show that the proposed method can achieve better subjective quality compared with that of the test model TMN5 of H.263, and slightly worse performance in PSNR, but with significantly better subjective quality in the facial areas, compared with that of the TMN8 of H.263+.

Paper Details

Date Published: 30 May 2000
PDF: 6 pages
Proc. SPIE 4067, Visual Communications and Image Processing 2000, (30 May 2000); doi: 10.1117/12.386588
Show Author Affiliations
Kewei Shi, Beijing Univ. of Posts and Telecommunications (China)
Anni Cai, Beijing Univ. of Posts and Telecommunications (China)
Jingao Sun, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 4067:
Visual Communications and Image Processing 2000
King N. Ngan; Thomas Sikora; Ming-Ting Sun, Editor(s)

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