Auto-focus adjusting apparatus such as for a video camera

Details Auto-focus adjusting apparatus such as for a video camera Auto-focus adjusting apparatus such as for a video camera

1996-07-03

2000-05-23

Ho, Tuan

Television

Camera, system and detail

Optics

348354, H04N 5232

Patent

active

060671157

ABSTRACT:
A video camera apparatus in which a signal of a certain frequency is extracted from an image pickup signal from an image pickup element such as CCD by a band-pass filter, a difference between the maximum and minimum values of the frequency of the image pickup signal is detected by a detecting circuit, the extraction value extracted by a band-pass filter is divided by the detection value detected by the detecting circuit by a normalizing circuit, thereby normalizing a focus estimation value, and a focus adjusting lens is moved by a lens driving motor on the basis of the normalized focus estimation value, thereby executing an automatic focus adjustment.

REFERENCES:
patent: 4969045 (1990-11-01), Haruki et al.
patent: 4985777 (1991-01-01), Kawada
patent: 4994920 (1991-02-01), Fujiwara et al.
patent: 5126849 (1992-06-01), Senuma et al.
patent: 5182649 (1993-01-01), Miyazaki
patent: 5192998 (1993-03-01), Tokumitsu et al.

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