The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2016
Filed:
Apr. 27, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Katsumi Karasawa, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A focus detector, which detects a defocus amount from a displacement amount between images formed by a pair of light beams split from an image pickup system so as to pass through a pair of pupil regions, includes a pair of lenses and phase difference sensors, a memory unit for storing an image displacement amount between the image signals on the phase difference sensors in an in-focus state, a waveform read out controller for setting pixels to be calculated for the phase difference sensors, respectively, based on the image displacement amount, a correlation calculator for calculating a correlation amount between the image signals from the pixels to be calculated, a waveform degree-of-conformity calculator for calculating a waveform degree-of-conformity based on the image signals obtained from the pixels to be calculated, and a defocus calculator for calculating the defocus amount based on the correlation amount and the waveform degree-of-conformity.