Patent ID: 7869087
Filing Date: 2011-01-11
Classification: B41J,G06K,H04N

Abstract:
1. A method of determining the color response of a color printer, the method comprising: printing a matrix of color patches on a test page using the color printer according to an input matrix of input colors in a printer-dependent input color space; measuring the printed color patches of the test page to provide a corresponding output matrix of output colors in a printer-independent-color space; deriving an initial inverse transform according to the input matrix and the output matrix; converting the output matrix of colors to input colors using the initial inverse transform to form a feedback matrix; computing individual color channel noise values in the input color space according to the input matrix and the feedback matrix; extracting spatial non-uniformity values according to the individual channel noise values to form a correction matrix in the input color space, wherein extracting spatial non-uniformities from the individual channel noise values comprises: computing a modified input matrix according to the input matrix and the correction matrix.