Image processing apparatus

Details Image processing apparatus Image processing apparatus

1992-09-10

1998-10-13

Boudreau, Leo

Image analysis

Image compression or coding

Quantization

382250, 348405, G06K 936, G06K 946

Patent

active

058224629

ABSTRACT:
An image processing apparatus for scalar-quantizing discrete-cosine transformation coefficients detects quantization error based upon a first odd function component of the discrete-cosine transformation coefficients, changes over the quantization conditions of a second odd function component of the discrete-cosine transformation coefficients in accordance with the quantization error detected, and performs scalar quantization in accordance with the quantization conditions thus changed over.

REFERENCES:
patent: 4774574 (1988-09-01), Daly et a.
patent: 4776030 (1988-10-01), Tzou
patent: 5150429 (1992-09-01), Miller et al.
patent: 5172237 (1992-12-01), Blonstein et al.
patent: 5243420 (1993-09-01), Hibi
H. Yasuda, "International Standardization for Color Photographic Coding", Journal of the Institute of Electronics Engineers of Japan, vol. 18, No. 6, pp. 398-407 (1989).

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