Patent ID: 8004714
Filing Date: 2011-08-23
Classification: G06K

Abstract:
1. A system for replacing bit pattern data in a stream of image bits used to drive a print head in an ink jet printer comprising: an image data pattern detection circuit having a plurality of comparators each comparator being configured to compare a portion of an image data bit stream used to drive a print head in an ink jet printer to a detection pattern in a plurality of detection bit patterns to enable the image data pattern detection circuit to detect at least one of the detection bit patterns in the image data bit stream and to generate a bit pattern detection signal in response to one of the comparators detecting one of the detection bit patterns in the portion of the image data bit stream compared to the detection bit patterns; a replacement bit pattern circuit being configured to select a replacement bit pattern from a plurality of replacement bit patterns in response to one of the comparators detecting one of the detection patterns, the selected replacement pattern being selected to replace the portion of the image data bit stream corresponding to the detected detection bit pattern and the replacement bit pattern being different than the detected bit pattern; and a tag register coupled to the image data pattern detection circuit and being configured to modify the comparison of the portion of the image data bit stream to one of the detection bit patterns.