Electronic focusing method and apparatus for television pick-up

Details Electronic focusing method and apparatus for television pick-up Electronic focusing method and apparatus for television pick-up

1982-07-22

1984-11-20

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

044842252

ABSTRACT:
Electronic focusing for television pick-up cameras and the like is effected by removing video synchronization information and discontinuities from the video signal, bandpass filtering the sync-free video signal below television cut-off frequency, producing a current therefrom and rectifying to charge capacitance which is integrated into a voltage, and periodically discharging the voltage to indicate a measure of average value of amplitude of signal which is maximized to focus the camera lens.

REFERENCES:
patent: 3621136 (1971-11-01), Stanwood
patent: 3883689 (1975-05-01), Mansour et al.
patent: 4053934 (1977-10-01), Kornreich et al.

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