Patent ID: 7649649
Filing Date: 2010-01-19
Classification: G06T

Abstract:
1. A method of color match assessment for electronic documents, said method comprising: (a) receiving into an image processing unit of a xerographic printing apparatus digital data defining a composite electronic document including both a raster image object having an edge and a color graphics object bordering said edge of said raster image object; (b) processing pixel color values defining said edge of said raster image object to estimate a local color variance of said pixel color values defining said edge, wherein the edge is defined by multiple rows/columns of said pixel color values, and wherein said step of processing pixel color values defining said edge comprises: calculating a row/column local color variance for each row/column of said pixel color values defining said edge; comparing said row/column local color variance for each row/column to said threshold; including said row/column in a low variance region for said edge if said row/column local color variance is below said threshold; increasing a color matching score that said edge can be color matched based upon an increasing number of rows/columns included in said low variance region for said edge; (c) determining said edge can be color matched based upon a magnitude of the color matching score, wherein a higher color matching score indicates a greater likelihood that said edge can be color matched; (d) if said edge can be color matched, deriving a match color for said edge, and associating said match color with said electronic document for use of said match color by a downstream object color match system of said image processing unit; (e) using said xerographic printing apparatus to print said composite electronic document on paper using ink or toner, wherein part of said composite electronic document is printed using said match color.