Image sensing apparatus having automatic focusing function...

Details Image sensing apparatus having automatic focusing function... Image sensing apparatus having automatic focusing function...

G - Physics

03

B

350/40, 88/94.5

G03B 13/36 (2006.01) H04N 5/232 (2006.01)

Patent

CA 1317493

ABSTRACT OF THE DISCLOSURE 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.

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