Method and apparatus for coding and recording an image signal an

Details Method and apparatus for coding and recording an image signal an Method and apparatus for coding and recording an image signal an

1997-06-26

2000-02-01

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348415, 348418, 348429, 348448, 382234, 386108, 386123, 358136, H04N 712

Patent

active

060209232

ABSTRACT:
A method and apparatus for coding and decoding an image signal, and also a recording medium for storing a coded image signal wherein low resolution image signal including a plurality of pixels and also a high resolution image signal including a plurality of pixels are received. The low resolution image signal is coded thereby generating a resultant coded low resolution image signal. The high resolution image signal is predicted from the low resolution image signal thereby generating a predicted high resolution image signal. After that, the predicted high resolution image signal is divided into a plurality of blocks each including n.times.m pixels. The feature of each block is detected and a judgement code corresponding to the detected feature is generated. Then a coding table is selected in accordance with the judgement code. The n.times.m pixels in the corresponding block of the high resolution image signal are coded using the selected coding table to generate coded data. In the above process, instead of directly coding the high resolution image signal, the difference between the high resolution image signal and the predicted high resolution image may be coded. The image signal can be compressed in a highly efficient fashion by coding the low resolution image signal and high resolution image signal.

REFERENCES:
patent: 5235420 (1993-08-01), Gharavi
patent: 5317413 (1994-05-01), Yanagihara
patent: 5339167 (1994-08-01), Kuroda
patent: 5398078 (1995-03-01), Masuda et al.
patent: 5436665 (1995-07-01), Ueno et al.
patent: 5677735 (1997-10-01), Ueno et al.
patent: 5870502 (1999-02-01), Bonneau et al.

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