Video signal control apparatus

Details Video signal control apparatus Video signal control apparatus

1987-10-21

1988-09-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358181, 358147, H04N 514, H04N 5262

Patent

active

047745800

ABSTRACT:
A video signal control apparatus disclosed herewith stores, in a memory, contrast control data that is output from a video operation unit, reads out the control data from the memory during a vertical retrace period in which no image is output, and performs contrast control within the vertical retrace period based on the control data.

REFERENCES:
patent: 3558815 (1971-01-01), Banks
patent: 3914545 (1975-10-01), Engel
patent: 4253110 (1981-02-01), Harwood et al.
patent: 4319278 (1982-03-01), Shimizu
patent: 4463371 (1984-07-01), Lewis, Jr.
patent: 4488179 (1984-12-01), Kruger et al.
patent: 4587554 (1986-05-01), Tamura et al.
patent: 4642690 (1987-02-01), Hinn

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