Video camera apparatus and automatic focusing circuit

Details Video camera apparatus and automatic focusing circuit Video camera apparatus and automatic focusing circuit

1996-05-09

1997-06-10

Garber, Wendy

Television

Camera, system and detail

Optics

348355, 348356, 2502017, H04N 5232

Patent

active

056381220

ABSTRACT:
An automatic focusing circuit comprises: a lens section including a focusing lens; photoelectric converting means for photoelectrically converting an amount of light which passed through the lens section; a first filter having first frequency characteristics to extract a first high frequency component from a luminance signal; a second filter which is used to extract a second high frequency component from said luminance signal and which has frequency characteristics steeper than those of the first filter; optical black level detecting means for detecting an optical black level of an image pickup signal; and a control section to control the focusing lens on the basis of the optical black level and the first and second high frequency components.

REFERENCES:
patent: 4922346 (1990-05-01), Hidaka et al.
patent: 5055665 (1991-10-01), Baba et al.

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