Patent ID: 8860873
Filing Date: 2014-10-14
Classification: G02B,G03B,H04N

Abstract:
1. A focus detection apparatus comprising: an image pickup part configured to include (a) first pixels photoelectrically converting a first image formed by a light flux passing through a first pupil area of an image-forming optical system to produce a first image signal and (b) second pixels photoelectrically converting a second image formed by a light flux passing through a second pupil area of the image-forming optical system to produce a second image signal; a filter generator configured to produce an image restoration filter to be used for a restoration process for the first image signal and the second image signal; an image restoration processor configured to respectively perform the restoration process on the first image signal and the second image signal by using the image restoration filter to produce a first restored image signal and a second restored image signal; and a calculating part configured to calculate a defocus amount of the image-forming optical system by using the first and second restored image signals, wherein the calculating part is configured to calculate a provisional value of the defocus amount by using the first and second image signals, and wherein, for a case where the provisional value is smaller than a predetermined value, the filter generator is configured to produce a greater number of the image restoration filters than for a case where the provisional value is greater than the predetermined value, the image restoration processor is configured to perform the restoration process on the first image signal and the second image signal by respectively using the greater number of the image restoration filters to produce a plurality of the first restored image signals and a plurality of the second restored image signals, and the calculating part is configured to calculate the defocus amount by using the pluralities of the first and second restored image signals.