Photography – With exposure objective focusing means – focusing aid – or... – Processing circuit
Reexamination Certificate
2005-08-09
2005-08-09
Gray, David M. (Department: 2851)
Photography
With exposure objective focusing means, focusing aid, or...
Processing circuit
C348S356000
Reexamination Certificate
active
06928241
ABSTRACT:
An object of this invention is to provide an autofocus apparatus and method, and an image sensing apparatus capable of shortening the AF time without decreasing the AF precision even when the total number of acquired AF evaluation signals is large. To achieve this object, whether previous and current photographing conditions satisfy a predetermined requirement in photographing is determined. When the previous and current photographing conditions are determined to satisfy the predetermined requirement, a focusing state only near an in-focus position in previous photographing is detected. When the previous and current photographing conditions are determined not to satisfy the predetermined requirement, a focusing state in the object region is detected. An in-focus position is determined by detecting the focusing state, and the in-focus position and photographing conditions are stored for the next photographing. A focus lens is moved to the in-focus position to photograph.
REFERENCES:
patent: 6130417 (2000-10-01), Hashimoto
patent: 6721499 (2004-04-01), Watanabe et al.
patent: 2000-152064 (2000-05-01), None
Canon Kabushiki Kaisha
Gray David M.
Morgan & Finnegan , LLP
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