Photography – With exposure objective focusing means – focusing aid – or... – Processing circuit
Patent
1996-10-25
1999-06-15
Adams, Russell
Photography
With exposure objective focusing means, focusing aid, or...
Processing circuit
396 95, 396121, 396122, 396123, G03B 1336
Patent
active
059130822
ABSTRACT:
An image signal processing apparatus for detecting a focusing state or a distance state by performing a correlation calculation of two images received by a light receiving section that includes a plurality of two dimensionally arranged photoelectric conversion elements. The apparatus includes a calculation circuit which divides a first area of the light receiving section into a plurality of blocks and calculates a focusing state or a distance state with respect to each of the plurality of blocks, a selection circuit which selects a second area included in the first area corresponding to the focusing state or the distance state of each of the blocks provided by the calculation circuit and a control circuit which divides the second area into a plurality of blocks and causes the calculation circuit to calculate a focusing state or a distance state with respect to each of the plurality of blocks.
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patent: 4720724 (1988-01-01), Yokoo
patent: 4749848 (1988-06-01), Sorimachi
patent: 5121152 (1992-06-01), Wagner
patent: 5196929 (1993-03-01), Miyasaka
patent: 5418595 (1995-05-01), Iwasaki et al.
patent: 5615398 (1997-03-01), Matsuyama
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Adams Russell
Canon Kabushiki Kaisha
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