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:
Aug. 16, 2011
Filed:
May. 22, 2009
Takashi Ebisawa, Wakaguri, JP;
Yukio Yoshikawa, Wakaguri, JP;
Takashi Ebisawa, Wakaguri, JP;
Yukio Yoshikawa, Wakaguri, JP;
Riso Kagaku Corporation, Tokyo, JP;
Abstract
When reading the first document sheet, light intensity reference data is acquired by sampling a white reference plate while acquiring light intensity reference auxiliary data indicative of the light intensity of a light source lamp by sampling an auxiliary white reference plate. Then, just before reading the second or subsequent sheet, the auxiliary white reference plate is sampled to acquire the latest light intensity auxiliary data, followed by calculating the change amount from the light intensity reference auxiliary data. The change amount is used to correct the light intensity reference data separately for each picture element by referring to the profile data in which is stored the change amount of the sample value of each picture element corresponding to the change amount of the light intensity, followed by performing the shading compensation. By this configuration, it is possible to perform shading compensation in correspondence with the actual light intensity reduction.