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:
Feb. 11, 2003
Filed:
Nov. 19, 1999
Joseph Paul Taillie, Pittsford, NY (US);
David Jon Metcalfe, Marion, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A color transformation matrix K transforms device dependent color imaging signals RGB into device independent color imaging signals XYZ. The transformation matrix K includes a set of coefficients k . An optimization value is calculated for the transformation matrix as a function of the coefficients within the transformation matrix having a value less than zero. The values of the coefficients within the transformation matrix are then adjusted; and a minimal optimization value is determined for the transformation matrix, which preferably has coefficients with values that are greater than zero. The optimization procedure seeks to minimize the optimization value by adjusting the values of the coefficients within the transformation matrix, such that the coefficients within the matrix are all positive values. This added constraint on the transformation matrix in the minimization technique will lead to larger residual color errors. However, in some cases, solutions may be found that minimize the errors without significantly affecting the XYZ values.