Focus state detection device and method

Details Focus state detection device and method Focus state detection device and method

1995-06-30

1997-06-17

Metjahic, Safet

Photography

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

Plural focusing or rangefinding areas

396 96, 396121, 396123, 396128, G03B 300, G03B 1318

Patent

active

056406185

ABSTRACT:
A defocus amount is accurately determined within the photo field. As applied to a focus state detection device, DC reduction filter process data is computed without completely extracting the DC component of the signal string output from an image sensor. The DC reduction filter process data is divided into three regions, and a determination is made as to whether focus state detection is possible for each region. When the determination is negative, a determination is made as to whether focus state detection is possible for all regions of first filter process data that extracts high frequency components. When the determination is negative, a determination is made in a similar manner as to whether focus state detection is possible on the basis of second filter process data and third filter process data. When the determination has been made that focus state detection is possible for all regions with one of the filter process data, a standard block is set, a weighing coefficient is set for each block on the basis of this standard block, the defocus amount of each block is altered, the defocus amounts are combined, and a final defocus amount is determined.

REFERENCES:
patent: 4980716 (1990-12-01), Suzuki et al.
patent: 5083150 (1992-01-01), Nagasaki et al.
patent: 5367153 (1994-11-01), Suda et al.
patent: 5469240 (1995-11-01), Uchiyama et al.
patent: 5481329 (1996-01-01), Uchiyama et al.
patent: 5485002 (1996-01-01), Kusaka
patent: 5485003 (1996-01-01), Kusada
patent: 5508506 (1996-04-01), Kusaka

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