Imaging apparatus having autofocus function

Details Imaging apparatus having autofocus function Imaging apparatus having autofocus function

2005-01-25

2005-01-25

Christensen, Andrew (Department: 2612)

Television

Camera, system and detail

Optics

C348S349000

Reexamination Certificate

active

06847402

ABSTRACT:
A still camera utilizes a focus evaluation value based on an imaging video signal to execute an autofocus operation by a hill-climbing control method. A CPU divides a focus area into a plurality of regions to obtain a focus evaluation value from a digital integrator for each of the regions. When the autofocus operation is restarted from the state of a monitoring mode in accordance with a variation of the focus evaluation value, the CPU detects a further hill of the focus evaluation value while forcibly moving a focus lens position always toward a near side, and when a maximal value of the once detected focus evaluation value is less than a certain standard value, additionally executes the autofocus operation.

REFERENCES:
patent: 4967280 (1990-10-01), Takuma et al.
patent: 5093716 (1992-03-01), Kondo et al.
patent: 6512549 (2003-01-01), Iijima et al.
patent: 3-68280 (1991-03-01), None

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