Patent ID: 6870639

Claim:
An image data processing apparatus, comprising: an image data replicating device configured to repeatedly replicate identical bit-mapped image data in predetermined times timed to a periodically generated signal; a pattern recognizing device configured to recognize characteristics of a line shape of a boundary between a black-dot region and a white-dot region of the image data in a bit-map formation replicated by said replicating device, the pattern recognizing device converting the recognized characteristics of the line shape of a dot into code information; a determining device configured to determine whether or not the dot is to be corrected by using at least a part of the code information; and a dot correction device configured to perform the correction, based on the code information, on a dot determined to be corrected by the determining device, wherein the number of times said image data replicating device replicates the identical bit-mapped image data is switchably set to one of 1) a case where the number of the replications is set to one fixed value, and 2) a case where the number of the replications is set such that two or more values are periodically selected.