Method and apparatus for coding and decoding digital image data

Details Method and apparatus for coding and decoding digital image data Method and apparatus for coding and decoding digital image data

1997-12-09

2000-03-28

Le, Vu

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348405, 348419, H04N 732

Patent

active

060441151

ABSTRACT:
An image coding method and apparatus for transforming and quantizing an image to produce transformed and quantized coefficients. The coefficients are coded and a complexity index value is obtained from the input image to calculate local characteristic values used to modify the quantization scale. In this manner, rate control is obtained on the basis of the local characteristics of the image, whereby the quality of the coded image and the precision of the rate control is improved.

REFERENCES:
patent: 5089889 (1992-02-01), Sugiyama
patent: 5598213 (1997-01-01), Chung et al.
patent: 5686962 (1997-11-01), Chung et al.
patent: 5691770 (1997-11-01), Keesman et al.
patent: 5748249 (1998-05-01), Fujiwara
patent: 5790745 (1998-08-01), Sugiyama et al.

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