Patent ID: 8259358

Claim:
An apparatus for eliminating moiré in a scanned digital image, the apparatus comprising: a first adder configured to receive an input image pixel and to add an error diffusion pixel to the input image pixel; an average circuit configured to take a weighted average of a gray level of the input image pixel and neighbor pixels thereof to obtain an output image pixel based at least in part on the weighted average of the gray level, wherein the weighted average of the gray level is based at least in part on a complexity of the moiré to be reduced; a second adder configured to subtract the error diffusion pixel from the output image pixel to obtain a neighbor image error; and an error filter configured to distribute a gray level difference of the input image pixel to the neighbor pixels and to process the neighbor image error to obtain a corrected pixel error and output the corrected pixel error to the first adder; wherein the first adder is configured to add the corrected pixel error to the input image pixel to obtain a corrected error diffusion pixel for processing of a subsequent input image pixel.