Patent ID: 6879734
Filing Date: 2005-04-12
Classification: G06T,G09G,H04N

Abstract:
1. 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, one or more pixels covered by the low pass filter are respectively replaced by one or more other pixels covered by the low pass filter based on which of the plurality of quadrants in the two-dimensional mask contains screen pixels as determined in the examining in step (c).