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:
Mar. 06, 2001
Filed:
Jul. 01, 1997
Applicant:
Inventors:
Francis K. Tse, Rochester, NY (US);
Barbara L. Farrell, Ontario, NY (US);
Ramesh Nagarajan, Fairport, NY (US);
Andre M. Blaakman, Webster, NY (US);
Richard S. Fox, Rochester, NY (US);
George W. Lahue, Canadaigua, NY (US);
Thomas I. Yeh, Penfield, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 9/00 ; G06K 9/40 ; G09G 5/10 ; H04N 1/40 ;
U.S. Cl.
CPC ...
G06K 9/00 ; G06K 9/40 ; G09G 5/10 ; H04N 1/40 ;
Abstract
The background grey-level of a document is determined based on the gain of the document. A histogram is generated and compressed. The standard deviation of the distribution curve of the compressed histogram is determined. A gain factor is determined using the mean and standard deviation. Using the background grey-level, the dynamic range of the document is adjusted.