Patent ID: 9001399
Filing Date: 2015-04-07
Classification: H04N

Abstract:
1. A method for compensating for side 1 to side 2 scan head differences in a scanning device capable of scanning a document in a duplex mode, the method comprising: scanning, using a side 1 scanner, at least one solid area patch printed in at least one reference color to capture a first set of color values; scanning, using a side 2 scanner, said same solid area patch to capture a second set of color values; generating, using a regression method, a matrix of coefficients, wherein multiplying each color value within said second set of color values by said matrix of coefficients minimizes a ΔE color difference metric between said first and second sets of color values; scanning a first image using said side 1 scanner; generating a first set of output color values corresponding to said first image, said first set of output color values comprising pixels within said first image multiplied by an identity matrix; scanning a second image using said side 2 scanner; and generating a second set of output color values corresponding to said second image, said second set of output color values comprising pixels within said second image multiplied by said matrix of coefficients.