Patent ID: 9197808
Filing Date: 2015-11-24
Classification: H04N

Abstract:
1. An image capturing apparatus comprising: an image pickup device configured to photo-electrically convert an object image; a focus detection sensor including a first pixel group in which pixels configured to receive light beams passing through a partial area of a pupil of an imaging optical system which forms an object image are arranged on a predetermined number of rows in a vertical direction and a second pixel group in which pixels configured to receive light beams passing through another partial area different from the partial area are arranged; a correlation calculation unit configured to perform correlation calculation by using signals from pixels of the first pixel group which are sampled at predetermined intervals in a horizontal direction and signals from pixels of the second pixel group; and a focus adjustment unit configured to perform a focus adjustment of a phase difference detection method using a result of the correlation calculation, wherein said correlation calculation unit performs a first correlation calculation by using signals from first sampled pixels of the first pixel group which are sampled at predetermined intervals in a horizontal direction and signals from pixels of the second pixel group and performs a second correlation calculation by sampling second sampled pixels, of the first pixel group, which have a positional shift amount of an integer multiple of a value obtained by dividing the predetermined interval by the predetermined number of rows from the first sampled pixels on a light-receiving surface of said focus detection sensor, and performing correlation calculation by using signals from the second sampled pixels and signals from the pixels of the second pixel group, and wherein said correlation calculation unit performs a reduction processing for reducing an error which is generated in the first correlation calculation and the second correlation calculation.