Picture coding device where the quantization step is adjusted in

Details Picture coding device where the quantization step is adjusted in Picture coding device where the quantization step is adjusted in

1997-02-24

2000-01-04

Rao, Anand S.

Television

Bandwidth reduction system

Data rate reduction

348405, 348404, 348415, 348416, 348412, 348699, H04N 718

Patent

active

060115890

ABSTRACT:
An object of the present invention is to improve visual picture quality. A picture signal is divided into a plurality of macro blocks and coding is conducted in macro block units. The coding is conducted including quantization process by a quantization portion. A motion compensation portion outputs the quantity of motion, L, in macro block units. An average quantity of motion, L.sub.ave, of a reference picture stored in a frame memory is outputted from a division portion. A control portion compares the quantity of motion L with two reference values relative to the average quantity of motion L.sub.ave and makes a correction to lower the quantization step in the quantization portion for macro blocks whose quantity of motion L is between the reference values. Accordingly, picture quality is improved in part of picture where motion is small and deterioration of visual picture quality is noticeable. At the same time, since the correction is not applied to picture with such slow motion that deterioration of picture quality is small, redundancy of coded signal does not unnecessarily increase.

REFERENCES:
patent: 5089888 (1992-02-01), Zdepski et al.
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patent: 5475433 (1995-12-01), Jeong
patent: 5731835 (1998-03-01), Kuchibholta
patent: 5745169 (1998-04-01), Murphy et al.
patent: 5751359 (1998-05-01), Suzuki et al.
ISO-IEC/JTC1/SC29/WG11 MPEG93/225B Test Model 4 "10 Rate Control and Quantization Control", Feb. 5, 1993, pp. 70-73.

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