Patent ID: 7193640
Filing Date: 2007-03-20
Classification: H04N

Abstract:
1. A computer-implemented method for use in a tandem printer, the method comprising the steps of: (A) receiving a representation of a subset of an image printed by the printer; (B) identifying a first pattern in the subset of the image, the first pattern encoding a position of the subset along a first axis of the image, wherein said first axis runs in a cross-web direction of said image and wherein said first pattern comprises a subset of a second pattern having a plurality of unique sub-patterns, wherein said second pattern comprises a plurality of lines running parallel to a second axis of the image and a plurality of shapes abutting the plurality of lines; (C) identifying the position of the subset along the first axis of the image based on the first pattern by the steps comprising; (C)(1) identifying one of the plurality of unique sub-patterns in the first pattern by matching a pattern of abutting shapes in the subset of the image to a pattern of abutting shapes in the first pattern; and (C)(2) identifying the position of of the subset along the first axis based on the sub-pattern identified in step (C)(1); and (D) estimating a color misregistration along the first axis of the image based on the position of the subset along the first axis of the image.