Patent ID: 6198549
Filing Date: 2001-03-06
Classification: G03G,H04N

Abstract:
A method of determining misregistration of a printer, the method comprising:printing multiple instances of a first and second repeated patterns, wherein for each printing instance, the first and second repeated patterns are printed at a different predetermined misregistration;measuring densities of the first and second repeated patterns for each printing instance;determining a density difference for each printing instance by subtracting the measured density of the first and second repeated patterns for the printing instance;determining a characteristic curve providing a relationship of the determined density differences to the predetermined misregistrations;calculating a correlation from the determined characteristic curve, wherein the correlation is between the density difference and predetermined misregistration;printing at least one additional print pattern after calculating the correlation;measuring density of the at least one additional print pattern;determining an amount of misregistration by applying the correlation to the measured density of the at least one additional print pattern.