Frame or sub-frame rate adaptive vector quantizer for moving ima

Details Frame or sub-frame rate adaptive vector quantizer for moving ima Frame or sub-frame rate adaptive vector quantizer for moving ima

1990-07-24

1991-11-26

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 358105, 375122, H04N 712, H04N 718

Patent

active

050687239

ABSTRACT:
An adaptive vector quantization scheme suitable for packet video adapts to the varying characteristics of the actual images sequence being compressed. A large code book is divided into two sections, having higher and lower priority, representing common characteristics and specific characteristics of images. Each new image to be coded is first compared to the common characteristics section of the code book. If a match of acceptable quality is not found, then it is compared to the specific characteristics section. The best match of the two sections is utilized. Entries in the two sections are reorganized and/or exchanged as a function of the usage of the code vectors therein. The rate and extent of adaptation is dictated by the update interval and the desired level of quality, respectively, without requiring any transmission of the vectors themselves or the side information.

REFERENCES:
patent: 4558350 (1985-12-01), Murakami
patent: 4710812 (1987-12-01), Murakami
patent: 4780761 (1988-10-01), Daly et al.
patent: 4791654 (1988-12-01), De Marca et al.
patent: 4797739 (1989-01-01), Tanaka
patent: 4845559 (1989-07-01), Labit et al.
patent: 4853779 (1989-08-01), Hammer et al.
Adaptive Vector Quantization of Video for Packet Switched Networks, Dixit, S. S. and Feng, Yushu, to be published in Proceedings of IEEE 1989 Int. Conf. on Acoustics, Speech and Signal Processing, Glasgow, May 23, 1989.

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