Patent ID: 9219853
Filing Date: 2015-12-22
Classification: H04N

Abstract:
1. A focus detection apparatus comprising: an image pickup element including a first pixel and a second pixel configured to detect light beams passing through different exit pupils in an image pickup optical system; a luminance evaluating circuit configured to estimate a moving charge amount between the first pixel and the second pixel by using a first luminance signal obtained in the first pixel and a second luminance signal obtained in the second pixel; one or more processors for implementing a correcting unit, a defocus amount calculating unit and a focus detecting unit, wherein: the correcting unit is configured to correct the first luminance signal and the second luminance signal based on an estimation result obtained in the luminance evaluating circuit; the defocus amount calculating unit is configured to obtain a defocus amount based on a first correction value of the corrected first luminance signal and a second correction value of the corrected second luminance signal; and the focus detecting unit is configured to perform focus detection of a phase difference method based on the defocus amount obtained by the defocus amount calculating unit, wherein the moving charge amount is a charge amount which moves from one of the first pixel and the second pixel to the other of the first pixel and the second pixel as a charge amount accumulated in the one of the first pixel and the second pixel comes close to a saturated charge amount.