Automatic facusing using slope and peak detection

Details Automatic facusing using slope and peak detection Automatic facusing using slope and peak detection

1983-03-28

1985-10-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

045449538

ABSTRACT:
There is disclosed a VIDEO AUTOMATIC FOCUSSING SYSTEM in which a video signal from the television camera is directed to a band pass filter and then detected to produce a DC signal indicative of the video signal as band limited. The detected signal is directed to the inputs of a negative slope detector and peak detector. The detectors monitor the slope of the video signal to form the basis for controlling the motor to achieve automatic focussing on command.

REFERENCES:
patent: 3643574 (1972-02-01), Moriyami
patent: 3699248 (1972-10-01), McKechnie
patent: 3728482 (1973-04-01), Wren
patent: 3967056 (1976-06-01), Yata et al.
patent: 4317135 (1982-02-01), Pitruzzello
patent: 4392726 (1983-07-01), Kimura

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