Focus detection apparatus for interpolating correlation value be

Details Focus detection apparatus for interpolating correlation value be Focus detection apparatus for interpolating correlation value be

1996-12-18

1998-03-24

Metjahic, Safet

Photography

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

Processing circuit

396125, 396114, 396 96, 396121, 2502018, G01J 120

Patent

active

057322929

ABSTRACT:
A light beam passing a photographing lens is divided into two portions by a mirror in a camera body. One of the two divided light beams is directed to an eyepiece via a screen and pentagonal prism. The other divided light beam is reflected from a mirror and directed to a focus detection optical system constructed by a field view diaphragm, condenser lens, diaphragm mask and re-imaging lens, and an image in position corresponding to the range-finding field view is divided into two images by the optical system. An image sensor is arranged near the re-imaging surface which receives the two images formed by the focus detection optical system to photoelectrically convert a received signal and transfer data to a CPU. The CPU effects the focus detection operation containing the operation of interpolating the value of correlation between the two images by use of the self-correlation value of one of the two images based on detection data and drives the photographing lens to a focused position.

REFERENCES:
patent: 4561749 (1985-12-01), Utagawa
patent: 4734571 (1988-03-01), Hamada et al.
patent: 5333028 (1994-07-01), Akashi et al.
patent: 5422701 (1995-06-01), Utagawa
patent: 5424528 (1995-06-01), Goto
patent: 5469528 (1995-11-01), Uchiyama et al.
patent: 5483318 (1996-01-01), Hamada et al.
patent: 5483336 (1996-01-01), Tocher
patent: 5485003 (1996-01-01), Kusada

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