Adaptive type compression method for compressing a color image b

Details Adaptive type compression method for compressing a color image b Adaptive type compression method for compressing a color image b

1984-04-27

1987-04-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358135, 358260, H04N 1104, H04N 1417, H04N 7137

Patent

active

046565000

ABSTRACT:
An adaptive type compression method for a color image in which each sequence of picture elements obtained by combination of sum-difference transformation with DPCM is compressed by being multiplied by an adaptive zonal filter. The sum-difference transformation is used to simplify transformation of the image into a spatial frequency zone. The zone filter characteristic is adaptively selected according to a predetermined transmission bit rate (compression rate). Further, this zonal filter characteristic is set so as to correspond with luminance and color difference signals. According to this method, image information to be recorded can be arbitrarily selected and distortion of the image at compressing and reproducing can be eliminated.

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patent: 4569058 (1986-02-01), Grallert
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