Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1995-08-22

1996-11-05

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Processing circuit

396111, G03B 1336

Patent

active

055722822

ABSTRACT:
In a focus detecting apparatus, comprising a focus detecting optical system which leads two images created by the light passing through two different points of an objective lens onto a pair of one-dimensional image sensor arrays, a divider for dividing the pair of image sensor arrays into small blocks to take out the image output from each block, a focus detection calculator for shifting, from each other, the image outputs obtained from the pair of image sensor arrays to calculate the relative shift amount of the two images, and a modifier for changing the width of the blocks; a focus detecting apparatus further comprising a decider which decreases the width of the blocks through the modifier when it analyzes the space frequency component of the subject and determines that the subject includes a high-frequency component, or increases the width of the blocks when it determines that the subject includes a low-frequency component.

REFERENCES:
patent: 4475800 (1984-10-01), Kinoshita et al.
patent: 4687917 (1987-08-01), Kusaka et al.
patent: 4812869 (1989-03-01), Akashi et al.
patent: 4833315 (1989-05-01), Horikawa
patent: 4851657 (1989-07-01), Taniguchi et al.

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