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. 17, 2004
Filed:
Jan. 15, 2003
Patricia J. Donaldson, Pittsford, NY (US);
Thomas F. Shane, Seneca Falls, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A method and system having real-time control of tone reproduction curves. The machine comprises: a moving photoreceptor; a means for storing a target tone reproduction curve; and, a means for updating a current tone reproduction curve LUT. The means for updating comprises a means for scheduling the depositing and measuring of the test patches; a means for depositing halftone test patches on the photoreceptor; a means for measuring the density of the halftone test patches and generating a measured tone reproduction curve; a means for computing differences between the measured tone reproduction curve and the target tone reproduction curve; a means for fitting the differences to a mathematical function; a means for calculating a new tone reproduction curve LUT based on the target tone reproduction curve and the fitted differences, including a means for limiting differences between the new tone reproduction curve LUT and a current tone reproduction curve LUT to a predetermined maximum magnitude; and a means for loading the current tone reproduction curve LUT with the new tone reproduction curve LUT.