Image processor with image data compression capability

Details Image processor with image data compression capability Image processor with image data compression capability

1996-05-07

1998-11-17

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358428, 382166, 395109, G06K 900, G06K 936

Patent

active

058384553

ABSTRACT:
In an image processor, image data of red, green and blue are converted to image data of lightness and chromaticities, and they are divided into pixel blocks. Then, image data of each block are compressed to data having 4 gradation levels smaller than 256 levels of the image data by generalized block truncation coding. Then, a capacity of image memory can be decreased. An attribute of the image data is decided for each block according to the compressed data. The attribute can be corrected by taking attributes of adjacent blocks into account.

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patent: 5491761 (1996-02-01), Kim
patent: 5585944 (1996-12-01), Rodriguez

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