Imaging device and focus parameter value calculation method

Abstract

An imaging device, comprising: an imaging element having a plurality of pixels arranged and formed therein in a two-dimensional array, and having phase difference pixels formed inside an effective pixel area; an imaging lens; a phase difference amount detection unit that analyses captured image signals from the imaging element and finds the amount of phase difference from a detection signal for two phase difference pixels forming a pair; and a control unit that finds the defocus amount for a photographic subject image captured by the imaging element, from the detected phase difference amount, and focus controls the imaging lens. The control unit: finds parameter values relating to the ratio between the defocus amount and the phase difference amount, on the basis of imaging lens information for the imaging lens and the light-reception sensitivity distribution, being the sensitivity for each angle of incidence for incident light, relative to two phase difference pixels forming a pair; and finds the defocus amount.

Description

technical field [0001] The invention relates to an image capture device comprising an image capture element with phase difference pixels and a method for calculating a focus parameter value. Background technique [0002] Some of the plurality of pixels formed and arranged in a two-dimensional array pattern in the light receiving area are formed by phase difference pixels (also referred to as focus detection pixels) mounted in an image sensor within an image capture device (camera). A phase difference AF method is adopted in an image capture device mounted with an image capture element as an AF method for adjusting the focus position of a photographic lens to a photographic subject. [0003] The phase difference pixel has a structure in which the phase difference pixel is divided into one pixel and the other pixel in a pair of pixels by a pupil, and one pixel receives one of two lights passing through different optical paths of the photographing lens, And another pixel recei...

AI Technical Summary

Problems solved by technology

[0005] In an image capture device equipped with an image capture element including phase difference pixels, when the image capture device is a lens replacement type image capture device, due to factors such as the placement position of the phase difference pixels on the image capture device or the distance between a pair of pixels The physical conditions of the interval cannot be changed, so when the photographic lens is replaced, the focusing accuracy of the photographic lens is affected

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