Patent ID: 6661535
Filing Date: 2003-12-09
Classification: H04N

Abstract:
A moire fringe eliminating apparatus including, a halftone dot recognizing means for receiving image data and recognizing halftone dots on the image data, and a moire fringe eliminating means for eliminating moire fringes on the halftone dots, wherein the moire fringe eliminating means comprises;a halftone dot feature extracting means for extracting features of the halftone dots; a re-calculation means for obtaining a recalculation deciding value which represents a ratio between a total number of the halftone dots in a neighboring area and the number of the halftone dots having a similarity of feature being smaller than a predetermined threshold value in the neighboring area; a re-calculation deciding means for deciding whether the threshold value should be changed in order to decide the necessity of change of the number of dots based on the re-calculation deciding value; and a halftone dot shape changing means for obtaining an amount of change of the number of dots to be increased or decreased for a target halftone dot, based on an amount of a feature of the halftone dots which are output when the threshold value is not changed in the neighboring area, an amount of the feature of the target halftone dot, and the number of dots of the target halftone dot.