Image processing apparatus and method

Details Image processing apparatus and method Image processing apparatus and method

1997-11-18

2000-06-13

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358539, 382166, 382232, 382251, H04N 1415

Patent

active

060756195

ABSTRACT:
An image encoding apparatus, as well as a method, which can suppress degradation of image quality in the image region which contains a predetermined color. The apparatus has a block data acquisition unit which divides inputted color image signal into plurality of block data, a specific color proportion measuring unit which measures proportion of the specific color in block data inputted thereto so as to produce a specific color proportion information signal, an orthogonal transformation unit which performs orthogonal transformation of block data as to output a transform coefficients, and a quantization unit which quantizes the inputted transform coefficients in accordance with the specific color proportion information signal so as to produce quantized data. The quantized data is then encoded into variable-length codes, whereby compressed data is obtained.

REFERENCES:
patent: 5150432 (1992-09-01), Ueno et al.
patent: 5383037 (1995-01-01), Kimura et al.
patent: 5588069 (1996-12-01), Katayama et al.

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