Image capturing apparatus and control method thereof

摘要

The image capturing apparatus (10) includes an image sensor 16 photoelectrically converting an object image formed by an image taking optical system (62), first and second photoelectric conversion elements provided in the image sensor or a focus detection element and photoelectrically converting paired focus detecting images formed by light fluxes passing through pupil areas of the image taking optical system, a filter processor (20) performing an image signal restoration process using a filter on first and second image signals obtained from the first and second photoelectric conversion elements, and a focus detector (20, 40) detecting a focus state based on a phase difference between the first and second image signals after the image signal restoration process. The filter processor calculates a contrast direction in which the object image has contrast, by using an output from the image sensor, and changes the filter depending on the contrast direction.

主权项

1. An image capturing apparatus comprising:
an image sensor configured to photoelectrically convert an object image formed by an image taking optical system; photoelectric conversion elements provided in one of the image sensor and a focus detection element separate from the image sensor, and configured to respectively photoelectrically convert paired focus detecting images formed by light fluxes passing through the image taking optical system to produce a first image signal corresponding to one of the paired focus detecting images and a second image signal corresponding to the other one of the paired focus detecting images, the first and second image signals having a phase difference therebetween corresponding to a defocus amount of the image taking optical system; a filter processor configured to perform an image signal restoration process using a filter on the first image signal and on the second image signal to provide restored first and second image signals; and a focus detector configured to detect a focus state of the image taking optical system based on the phase difference between the restored first and second image signals, wherein the filter processor is configured to calculate a contrast direction in which the object image has contrast, by using an output from the image sensor, and configured to change the filter depending on the contrast direction.