Image capturing apparatus and method for calculating sensitivity ratio of phase difference pixel

摘要

An image capturing apparatus includes: an image capturing element in which a plurality of pixels are formed and arranged and phase difference pixels are formed within an effective pixel region; a photographing lens; and a control unit which analyzes a captured image signal by the image capturing element, obtains a phase difference amount from detection signals of two of the phase difference pixels that make a pair, and performs a focusing control of the photographing lens, in which the control unit calculates, as a sensitivity ratio, a ratio of an integration value of light receiving sensitivity of the phase difference pixel within a range of an incident angle of the photographing lens, and an integration value of light receiving sensitivity of a pixel other than the phase difference pixel, and corrects a deviation in light receiving sensitivity between the two phase difference pixels.

主权项

1. An image capturing apparatus, comprising:
an image capturing element in which a plurality of pixels are formed and arranged in a two-dimensional array pattern and phase difference pixels are formed in a focus detection region within an effective pixel region; a photographing lens which is installed in a stage preceding the image capturing element; and a control unit configured to
analyze an image signal captured by the image capturing element,obtain a phase difference amount from detection signals of two of the phase difference pixels that make a pair,performs focusing control of the photographing lens,acquire a first integration value, within a range of an incident angle of the photographing lens, of light receiving sensitivity of a phase difference pixel;acquire a second integration value, within the range of the incident angle, of light receiving sensitivity of a pixel other than the phase difference pixel;calculate, as a sensitivity ratio, a ratio between the first integration value and the second integration value;andcorrects a deviation in light receiving sensitivity between the two phase difference pixels that make the pair with the sensitivity ratio to correct the detection signals for acquiring the phase difference amount.