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:
Dec. 14, 2004
Filed:
Nov. 02, 2000
Takayuki Saeki, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
It is an object of this invention to provide an image pickup apparatus capable of suitable appropriate exposure control even when objects having extremely different luminance contrasts exist at the same field angle. The invention provides an image pickup apparatus including an integral circuit and a control circuit. The integral circuit calculates an average value a of photometry luminance integral data of all of m×n divided photometry frames, and an average value a of photometry luminance integral data of x divided photometry frames sampled in descending order of luminances from the m×n divided photometry frames. When the difference between the average values a and a exceeds a predetermined threshold value z, the control circuit performs correction of decreasing an appropriate target value of exposure control in accordance with the value of (a a ).