Patent ID: 6879733

Claim:
A method for removing image artifacts from a representation of an image, comprising the steps of: (a) obtaining a pixel representation of the image; (b) classifying each pixel in the image as a screen or non-screen pixel, wherein a screen pixel is defined as a pixel that is part of a predetermined periodic pattern; (c) examining pixels in a predetermined surrounding area of each pixel to check the classification of that pixel as determined in step (b) by applying a two-dimensional mask that is divided into a plurality of quadrants, the center of the two-dimensional mask being common to each of the quadrants; and (d) selectively applying a low pass filter to pixels in the image, such that, when the low pass filter is applied, a center of the low pass filter is selectively shifted relative to a current pixel based on which of the plurality of quadrants in the two-dimensional mask contains screen pixels as determined in the examining in step (c).