Automatic focusing device

Details Automatic focusing device Automatic focusing device

1987-10-08

1989-10-03

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, 354430, H04N 5238

Patent

active

048720585

ABSTRACT:
An automatic focusing device which is arranged to perform a focusing action by detecting the peak value of a high frequency component of a video signal obtained from within a focus detecting area set on the image sensing plane of an image sensor and by driving a photo taking optical system in such a way as to increase the detected peak value comprises: a peak position detecting circuit which locates a position on the image sensing plane at which the peak value of the high frequency component of the video signal is detected; and a gate control circuit which changes the position of the focus detecting area in accordance with the detected peak position which is located by the peak position detecting circuit.

REFERENCES:
patent: 4320417 (1982-03-01), Hanma et al.
patent: 4392726 (1983-07-01), Kimura
patent: 4611244 (1986-09-01), Hanma et al.
patent: 4614975 (1986-09-01), Kaite
patent: 4647979 (1987-03-01), Urata

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