Image sensing apparatus having automatic focusing function for a

Details Image sensing apparatus having automatic focusing function for a Image sensing apparatus having automatic focusing function for a

1990-02-14

1991-03-26

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 1336

Patent

active

050033395

ABSTRACT:
In a video camera having an automatic focusing function, a first sampling area in the center of an image sensed picture and a second sampling area around the first sampling area are set. Considering a case in which an auto-focus operation is carried out selecting the first sampling area as a focusing area, when the difference between the newest focus evaluating value and the maximum focus evaluating value becomes one-eighth or more of the maximum focus evaluating value, the second sampling area is selected as the focusing area, to carry out an auto-focus operation. Consequently, an auto-focus operation conforming to the state of an object is carried out. In addition, a priority area for exposure control is selected following selection of the focusing area. Thus, exposure relative to a main object is always maintained most suitably. Furthermore, even if the focus evaluating value has no distinct peak, the erroneous detection of the in-focus position can be prevented since the sampling area having a larger maximum value per unit area is selected as a focusing area.

REFERENCES:
patent: 4591919 (1986-05-01), Kaneda et al.
patent: 4614975 (1986-09-01), Kaite
patent: 4762986 (1988-08-01), Suda et al.
patent: 4804831 (1989-02-01), Baba et al.

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