Autofocus apparatus

Details Autofocus apparatus Autofocus apparatus

1990-06-07

1991-12-10

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 1300

Patent

active

050722506

ABSTRACT:
In an autofocus apparatus for an imaging means such as a TV camera, an object image signal is produced by an imaging means and a focusing operation is conducted automatically by moving a focusing lens so as to maximize a high frequency component of the image signal. Automatic focusing operation is commenced only when the level of the image signal has remained smaller than the threshold value for longer than a prescribed period of time, whereby no unnecessary automatic focusing operation is conducted when the level of the high frequency component decreases because of movement of the camera or the object it is imaging.

REFERENCES:
patent: 4872058 (1989-10-01), Baba et al.

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