Picture signal coding apparatus

Details Picture signal coding apparatus Picture signal coding apparatus

1978-11-14

1980-12-09

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, 358283, 364515, 3401463AQ, H04N 712, G06K 900

Patent

active

042387680

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.

REFERENCES:
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3869698 (1975-03-01), Trost et al.
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 4064484 (1977-12-01), Mese et al.
patent: 4196452 (1980-04-01), Warren et al.
patent: 4196453 (1980-04-01), Warren
patent: 4196454 (1980-04-01), Warren
T. E. Cassada and J. E. Garcia, Sep. 1973, "Facsimile Threshold with Background Control", IBM Technical Disclosure, vol. 16, No. 4.
M. L. Duff, "Gradient Detection System", IBM Technical Disclosure, vol. 18, No. 12, May 1976.

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