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:
Jan. 25, 2000
Filed:
Jan. 11, 1995
Applicant:
Inventor:
Takashi Kawai, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
382274 ; 358504 ; 358516 ; 358524 ;
Abstract
When a color film original is read, a shading correction or the like is executed without using a color base film. An apparatus has: an RAM 115 in which output ratios of RGB signals from an RGB sensor (CCD) 106 for an unexposed portion of a color film have previously been stored; an amplifier 107 to amplify the signals from the CCD line sensor 106 by gains based on the RGB signal output ratios from the RAM 115 without transmitting through the base film when shading correction data is read; and a shading correction circuit 110 to give the shading correction data to an RAM 111 on the basis of outputs of the amplifier 107.