Automatic focus control device

Details Automatic focus control device Automatic focus control device

1991-05-06

1993-01-26

Goldstein, Herbert

Facsimile and static presentation processing

Facsimile

Recording apparatus

354400, 354402, H04N 5232, G03B 300, G03B 1318

Patent

active

051826496

ABSTRACT:
An automatic focus control device capable of obtaining an accurate in-focus state of a subject having less high-frequency components is provided. A luminance signal of the video signal of the subject is first differentiated by a combination of a delay circuit (27) and a difference forming circuit (26). The differentiated luminance signals are accumulated by an accumulator (31), and a clock pulses CL are counted by a counter (32) during the periods when the differentiated luminance signals exceed a predetermined value. The accumulated value is then divided by the clock count at a divider (33) to obain a focus control signal which is fed to a microcomputer (35). The microcomputer causes a lens (11) to move in accordance with this focus control signal so that an optimum in-focus state of the subject is obtained.

REFERENCES:
patent: 4717959 (1988-01-01), Isago
patent: 4872058 (1989-10-01), Baba et al.
patent: 5012270 (1991-04-01), Sekine et al.
patent: 5083150 (1992-01-01), Nagasaki et al.

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