Patent ID: 9407812
Filing Date: 2016-08-02
CPC Classification: G02B,G03B,H01L,H04N

Claim Text:
1. An image pickup apparatus comprising: an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged; at least one processor or circuit configured to perform the operations of the following units: an area setting unit configured to set a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal output from said image pickup device, to set at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and to define a correlation operation area including the focus detection area and the at least one shift area; a focus detection unit configured to find, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub-pixels, and to calculate the defocus amount in response to the correlation amount concerned; and a control unit configured to set the width of the at least one shift area to a predetermined width when the focus detection area is set at a position where the correlation operation area can be set with a first width in the image, and to set the width of the at least one shift area to a width narrower than the predetermined width to set the width of the correlation operation area to a second width narrower than the first width when the focus detection area is set at a position where the correlation operation area cannot be set with the first width.