IMAGE PICKUP APPARATUS CAPABLE OF PERFORMING AUTOFOCUS CONTROL IN RESPONSE TO OUTPUT OF IMAGE PICKUP DEVICE, CONTROL METHOD THEREFOR, AND STORAGE MEDIUM STORING CONTROL PROGRAM THEREFOR

摘要

An image pickup apparatus that is capable of performing a focusing control with sufficient accuracy without restricting a settable range of a focus detection area. An image pickup device has pixels each of which has sub-pixels that receive light beams passing through different pupil areas. A correlation operation area including a focus detection area and a shift area is set in an image indicated by an output from the image pickup device. A defocus amount is calculated in response to a correlation amount found by applying a shift process to image signals from the sub-pixels. If the focus detection area is set at a position where the correlation operation area is set with a default width, the shift area is set with a predetermined width. Otherwise the shift area is set with a narrower width and the correlation operation area is set with a width narrower than the default width.

主权项

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 two-dimensionally; 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 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.