Apparatus for eliminating moiré in scanned image and method for the same

摘要

A method for eliminating moire in scanned digital image comprises the steps of using an average circuit for taking weighted average and error diffusing a gray level difference between an error diffusion pixel G_ij and neighbor pixels to neighbor to obtain output image pixel Y'_ij; using a second adder for subtracting the error diffusion pixel G_ij from the output image pixel Y'_ij to obtain a neighbor image error d_ij; using a error filter H(z) to process the neighbor image error d_ij to obtain a corrected pixel error H(d(i,j)); and using a first adder for adding the corrected pixel error H(d(i,j)) and the input image pixel Y_ij to obtain the corrected error diffusion pixel G_ij, and then jumping to first step until all pixels being processed. The method provides real time treatment for eliminating moire and provide smooth image.