Auto-focusing apparatus

Details Auto-focusing apparatus Auto-focusing apparatus

1995-01-11

1996-04-30

Razavi, Michael T.

Television

Camera, system and detail

Optics

348345, H04N 5232

Patent

active

055129510

ABSTRACT:
An auto-focusing apparatus which obtains an evaluation value from a contrast component of a video signal and performs focus adjustment so that the evaluation value will be maximum, comprises: measurement frame setting means for setting a first frame and a second frame on the screen to obtain the evaluation value; and evaluation value generating means for obtaining a first evaluation value and a second evaluation value from the first frame and the second frame. Focus adjustment is performed by selecting the first frame or the second frame according to changes of the first evaluation value and the second evaluation value when a focus lens is moved in a very small amount.

REFERENCES:
patent: 5097282 (1992-03-01), Itoh et al.
patent: 5128768 (1992-07-01), Suda et al.
patent: 5150217 (1992-09-01), Senuma et al.
patent: 5212516 (1993-05-01), Yamada et al.
patent: 5235428 (1993-08-01), Hirota et al.

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