Method of expanding compressed color image data

Details Method of expanding compressed color image data Method of expanding compressed color image data

1989-06-06

1992-02-18

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358426, 358433, 358 75, 382 56, 364725, G03F 38, H04N 700, H04N 712

Patent

active

050898841

ABSTRACT:
In a method of expanding a compressed color image, in units of blocks each consisting of a plurality of pixels, to lightness information and chromaticity information representing a block, original lightness information is decoded on the basis of the compressed lightness information in units of blocks, and chromaticity information of each pixel in the block is decoded in accordance with a distribution and gradient of the decoded lightness information value.

REFERENCES:
patent: 4580134 (1986-04-01), Campbell et al.
patent: 4758885 (1988-07-01), Sasaki et al.
patent: 4887151 (1989-12-01), Wataya

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