Apparatus for achieving compression encoding on components of im

Details Apparatus for achieving compression encoding on components of im Apparatus for achieving compression encoding on components of im

1990-02-15

1991-09-03

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358135, 358138, H04N 7133, H04N 1104

Patent

active

050459252

ABSTRACT:
An image signal compression encoding apparatus achieving a two-dimensional orthogonal transformation encoding includes encoders to encode dc and ac components. For the encoders, each time the luminance signal Y, the color difference signal R-Y, or the color difference signals B-Y is to be encoded, an encoding table is changed. In these encoders, for example, the number of blocks are counted to detect events that the respective data amounts of the luminance signal Y and the color difference signals R-Y and B-Y are reached so as to alter the encoding table. This apparatus uses an appropriate encoding table by means of which the luminance signal Y and the color difference signals R-Y and B-Y can be encoded.

REFERENCES:
patent: 4394774 (1983-07-01), Widergrin
patent: 4707738 (1987-11-01), Ferre
patent: 4780761 (1988-10-01), Daly
patent: 4982282 (1991-01-01), Saito

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