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. 02, 2003
Filed:
Nov. 30, 1998
Takahiro Oda, Tokyo, JP;
Kenji Kadota, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
The present invention is an automatic focusing apparatus for automatically focusing on a subject in an image plane. The automatic focusing apparatus includes a focus lens for focusing on the subject, drive means for moving the focus lens, an image element for picking up image data from the subject through the focus lens, an image processor for extracting luminance signals of each pixel from the image data picked up by the image element, and a controller for computing contrast value under the luminance signals of each pixel extracted by the image processor, for computing moving quantity of the focus lens by using inverse number of the contrast value, and for controlling the drive means according to the moving quantity.