Model-based coding of videophone images
作者:
W.J.Welsh,
期刊:
Electronics & Communication Engineering Journal
(IET Available online 1991)
卷期:
Volume 3,
issue 1
页码: 29-36
年代: 1991
DOI:10.1049/ecej:19910006
出版商: IEE
数据来源: IET
摘要:
The requirement for improved picture quality in videophone and videoconference systems operating at low bit-rates has stimulated interest in model-based image coding. In this paper, two model-based coding techniques are described which are capable of producing either improved picture quality at bit-rates around 64 kbit/s or acceptable picture quality at bit-rates far lower than 64 kbit/s. The first technique produces facial expressions by using feature code-books; the second technique produces facial expressions by distorting an underlying three-dimensional model. The problems of image analysis and synthesis, which are concomitant in model-based coding, are discussed.
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