Patent ID: 9386217
Filing Date: 2016-07-05
CPC Classification: H01L,H04N

Claim Text:
1. An image capturing apparatus comprising: an image sensor including a plurality of pixels that are two-dimensionally arranged and include focus detection pixels including photoelectric conversion units configured for outputting a pair of image signals obtained by receiving a pair of light beams that have passed through different exit pupil regions of an imaging optical system; a determination unit configured to determine whether or not each line of the pixels of said image sensor is an addition line that outputs an image signal suitable for detection of a correlation amount; a calculation unit configured to, while shifting, with respect to each other, the pair of image signals output from the focus detection pixels in each addition line by a predetermined amount, calculate a correlation amount between the pair of image signals at each shift amount for each addition line, add a plurality of correlation amounts, that are calculated for each of the addition lines, for each shift amount, and obtain a minimum added correlation amount that is a minimum value of the plurality of added correlation amounts added for each shift amount; a counting unit configured to count the number of addition lines added by the calculation unit; a computing unit configured to obtain a defocus amount based on the minimum added correction amount; and a focus control unit configured to drive a focus lens included in the imaging optical system based on the defocus amount when an evaluation value obtained based on the minimum added correction amount and the number of addition lines counted by the counting unit is higher than a predetermined value.