Patent ID: 8320012
Filing Date: 2012-11-27
Classification: H04N

Abstract:
1. An apparatus associated with a printing device having a plurality of print engines comprising a first print engine and at least one second print engine, the apparatus comprising: a pixel clock generating module which generates a reference signal operating at a single video frequency derived from a clock and the first print engine; and a color data modification module which modifies color data for the at least one second print engine based on an accumulated phase error for the at least one second print engine, wherein the accumulated phase error is calculated based on calibration information for the at least one second print engine relative to the first print engine, wherein the calibration information specified for the at least one second print engine is used to derive an ideal operating frequency for the at least one second print engine, and wherein the color data modification module modifies the color data for the at least one second print engine by deleting a pixel in the color data when the single video frequency is lower than the ideal operating frequency for the at least one second print engine and the accumulated phase error exceeds a predetermined threshold.