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Proceedings Paper

Object-based coding method for visual telephony using discrete wavelet transform
Author(s): Keith Hung-Kei Chow; King-Ip Chan; Ming Lei Liou
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Paper Abstract

For applications such as videophone or videoconferencing, we all agree that foreground object is more important than the background information. Nevertheless, in most conventional video codecs, such as H.261, due to the variation of the background lighting, noise or other unpredictable reasons, a large amount of available bandwidth is used to code the residue blocks at the background. Thus, it makes the coding inefficient when we consider the subjective visual quality of the foreground object. In this paper we proposed an object-based coding method. It tries to identify the foreground object and then put most of the resources to code it. We suggest a block-based DWT as a coding kernel because of its simple structure and outstanding performance. Experimental results show that we can compress a video sequence down to below 20 kb/s while having a reasonable visual quality.

Paper Details

Date Published: 21 April 1995
PDF: 11 pages
Proc. SPIE 2501, Visual Communications and Image Processing '95, (21 April 1995); doi: 10.1117/12.206709
Show Author Affiliations
Keith Hung-Kei Chow, Hong Kong Univ. of Science & Technology (Hong Kong)
King-Ip Chan, Hong Kong Univ. of Science & Technology (Hong Kong)
Ming Lei Liou, Hong Kong Univ. of Science & Technology (Hong Kong)


Published in SPIE Proceedings Vol. 2501:
Visual Communications and Image Processing '95
Lance T. Wu, Editor(s)

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