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. 12, 2017
Filed:
Jun. 06, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Yuki Yoshimura, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image pickup apparatus including an image pickup unit for outputting image signals obtained by respectively photoelectrically converting light passing through different exit pupil areas of a focusing optical system, and a setting unit for setting a focus detection area into an image pickup area of the image pickup unit, stores at least one approximate function for calculating correction values of the image signals obtained by the image pickup unit in an approximation manner, obtains an approximate function effective for the correction at least in the focus detection area set by the setting unit on the basis of at least the one stored approximate function to calculate a correction value in accordance with the obtained approximate function; and performs a focus detection by using the image signals obtained by the image pickup unit and the calculated correction values.