Encoding apparatus for color image data with block-by-block indi

Details Encoding apparatus for color image data with block-by-block indi Encoding apparatus for color image data with block-by-block indi

1989-04-19

1989-12-12

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, G03F 308, H04N 146

Patent

active

048871516

ABSTRACT:
There is disclosed an apparatus for efficient and faithful encoding of color image data, by dividing color image data into blocks, extracting luminosity information, structure information and color information from each block, and for each block, individually encoding or individually quantizing the color image the structure information and the luminosity information. The signal system may be one employing signals of low mutual correlation, such as an L*a*b* signal system. An orthogonal transformation of the L* components of the color image data for the respective blocks may be performed.

REFERENCES:
patent: 4553172 (1985-11-01), Yamada et al.
patent: 4646134 (1987-02-01), Komatsu et al.
patent: 4786975 (1988-11-01), Postl
patent: 4797945 (1989-01-01), Suzuki et al.

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