Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1975-12-02
1977-06-14
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
307263, 358166, H04N 514, H04N 9535
Patent
active
040301214
ABSTRACT:
A system of shortening transition time of transitions occurring in video signals is disclosed which includes circuitry for multiplying a function of the full wave rectified first differential of the input video signal by a function of the second differential of the input video signal and then adding the waveform resulting from such a product to the properly delayed input signal to provide a crispened output video signal. The system may be provided to crispen the luminance and chroma signals of a color television video signal. A system for shortening transitions of low bandwidth chroma information with higher bandwidth luminance information is also disclosed.
REFERENCES:
patent: 2678964 (1954-05-01), Loughlin
patent: 2740071 (1956-03-01), Goldmark et al.
patent: 2851522 (1958-09-01), Hollywood
patent: 2863999 (1958-12-01), French
patent: 3946152 (1976-03-01), Illetschko et al.
A. N. Thiele, "Horizontal Aperture Equalization", Radio and Electronics Engineer, Oct. 1970, p. 193.
"Mark IV Automatic Image Enhancer, Models 8010, 8310, and 8410," CBS Laboratories Technical Bulletin, Mar. 1974.
Goldmark and Hollywood, "A New Technique for Improving the Sharpness of Television Pictures", Proceedings of the IRE, Oct. 1951, p. 1314-1322.
Griffin Robert L.
Harrison David B.
Saffian Mitchell
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