Picture signal coding apparatus

Details Picture signal coding apparatus Picture signal coding apparatus

1978-11-14

1980-05-27

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, 358282, 358284, 358287, 3401463AG, 358138, H04N 712

Patent

active

042053412

ABSTRACT:
A frame of a gray-scaled picture is divided into blocks, in each of which the mean luminance of picture elements is used as a threshold value for comparison with each picture element signal to classify it into 0 or 1 according to its magnitude to provide a resolution component. From the resolution component and each picture element signal in the block are calculated two gray components; the resolution component and the two gray components are used as coded outputs for each block. The size of each block is changed in accordance with the property of the picture in the portion corresponding to the block.

REFERENCES:
patent: 3462547 (1969-08-01), Macovski
patent: 3582887 (1971-06-01), Guthrie
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3737854 (1973-06-01), Klemt
patent: 3869698 (1975-03-01), Trost et al.
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 4064484 (1977-12-01), Mese et al.

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