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:
Nov. 08, 1988
Filed:
Aug. 23, 1985
Izumi Takashima, Ebina, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
In an information reading apparatus in which picture image data of manuscript read with a manuscript reader is converted into a digital signal including picture image data or shading correction reference density data of the manuscript, and the digital signal is converted into a logarithmic value. A memory device is used for storing the shading correction reference density data which has been converted into a logarithmic value and a subtractor is provided for subtracting data stored in the memory device at the time of no light input from picture image data and shading correction reference density data so as to effect a base level correction of the both data. A shading correction circuit is provided for effecting a shading correction based on the picture image data and the shading correction reference density data whose level have been corrected by the subtractor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile