Video signal transmission method and apparatus employing variabl

Details Video signal transmission method and apparatus employing variabl Video signal transmission method and apparatus employing variabl

1993-02-22

1998-10-13

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348405, 348413, 348404, 348408, 348403, H04N 718

Patent

active

058220062

ABSTRACT:
A video signal transmission method and apparatus for instantaneously providing a normally reproduced picture upon start of an image data transmission or in other potentially unstable states through steady processing, wherein the image signal of one frame is first divided into a plurality of blocks. The image signal of the divided blocks is coded by intraframe coding and interframe coding. The intraframe-coded signal for one frame is transmitted periodically. Meanwhile, the magnitude of the correlation between two blocks is detected, one of the two blocks belonging to a given frame and corresponding to the other block belonging to the preceding frame. Then the quantization characteristic of the image signal to be transmitted is controlled in accordance with the detected magnitude of the correlation.

REFERENCES:
patent: 5005077 (1991-04-01), Samad et al.
patent: 5028999 (1991-07-01), Vogel
patent: 5046071 (1991-09-01), Tanoi
patent: 5144426 (1992-09-01), Tanaka et al.
patent: 5291282 (1994-03-01), Nakagawa
CCITT Recommandetion H.261 1990, Geneva `Video codec for audiovisual services at P .times.65 kbit/s`.
Comp. Con 91 Digest of Papers 1991, San Francisco pp. 394-395 XP294007 D. Le Gall The MPEG video compression standard.

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