Patent ID: 7319542
Filing Date: 2008-01-15
Classification: H04N

Abstract:
1. A document rehabilitation method, comprising: providing an original document that includes a set of desirable markings that are substantially achromatic, and a set of undesirable markings; generating an image file that includes color data corresponding to the original document; and applying a transform filter to the image file, such that the color data for each undesirable marking is mapped to a non-reproduced color, and the color data for each desirable marking is substantially unchanged; wherein applying the transform filter includes applying a transform filter corresponding to a substantially cylindrical volume in L*a*b* color space having an axis that is substantially coincident with the L* axis, and thereby preserving color data falling within the cylindrical volume of the transform filter, and mapping color data falling outside the cylindrical volume of the transform filter to the non-reproduced color.