Method and circuit arrangement for the improvement of the pictur

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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375 33, H04N 7137

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active

046072810

ABSTRACT:
A method for improving picture quality given DPCM coded television signals provides for the determination of an activity criterion from the video values of the same television field which surround a current sample and the video signal values of the preceding television field by calculation of the intensity differences between the video signal values. The estimated value is determined from the video signal values of the most recent television field, from the video signal values of the most recent and current television fields, or only from the video signal values of the current television fields, as a function of two thresholds.

REFERENCES:
patent: 4144543 (1979-03-01), Koga
patent: 4371895 (1983-02-01), Koga
patent: 4437119 (1984-03-01), Matsumoto
patent: 4460923 (1984-07-01), Hirano
patent: 4488174 (1984-12-01), Mitchell
patent: 4494140 (1985-01-01), Michael
Pirsch, P., "Adaptive Intra-Interframe DPCM Coder", The Bell System Technical Journal, vol. 61, No. 5, May-Jun. 1982, pp. 747-764.
"Standards for Televisions Systems Using Digital Modulation", CCIR Study Groups, 1978-1982, Doc. 11, Doc. CMTT pp. 1-9.

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