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:
Jun. 12, 1990
Filed:
Feb. 11, 1987
Applicant:
Inventors:
Akira Hiramatsu, Yokohama, JP;
Yuichi Sato, Yokohama, JP;
Tokuichi Tsunekawa, Yokohama, JP;
Shigeki Yamada, Yokohama, JP;
Takeshi Kobayashi, Yokohama, JP;
Makoto Katsuma, Wako, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
382-8 ; 356237 ; 358106 ; 382-1 ;
Abstract
An image data reading apparatus includes a photoelectric conversion device for converting image data on an original into electric signals, a light source for illuminating the original, a detector for detecting the shading correction values for the light source and the photoelectric conversion device, and an image processor for effecting shading correction on the video data output from the photoelectric conversion device with the shading correction value detected by the correction value detector.