Coordinitization of tone reproduction curve in terms of basis functions

US5749020A · kind A · utility

Assignee

• Xerox Corporation · US

Inventors

• Lingappa K. Mestha · Fairport, US
• Yao Rong Wang · Webster, US
• Sohail A. Dianat · Pittsford, US
• Pramod P. Khargonekar · Ann Arbor, US
• Daniel E. Koditschek · Ann Arbor, US
• Eric Jackson · Webster, US
• Tracy E. Thieret · Webster, US

Key dates

• Filing date: Nov 21, 1996
• Grant date: May 5, 1998
• Expiry date: Nov 21, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/00042
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Fundamental machine functions such as the Tone Reproduction Curve need to be divided into regions of smaller units so that each unit can be interrelated to some aspects of the internal machine process. A first step toward that is by decomposing measured TRC in terms of what are known as "orthogonal basis functions". Two significant applications for orthogonal basis functions may be extensive use in color controls to maintain color consistency for every page, every time and all the time. The use of basis functions might also lead to a new soft sensor for use in certain machines.