Patent ID: 7593592
Filing Date: 2009-09-22
Classification: H04N

Abstract:
1. A method of processing data corresponding to pixels of a sequence of digital images so as to detect a grid corresponding to blocking artifacts, comprising: high-pass filtering a portion of a digital image to supply at least one set of discontinuity pixels, detecting blocking artifacts from the at least one set of discontinuity pixels, and searching rows within the portion of the digital image for a grid row having a density of blocking artifacts that is substantially larger than that of its neighboring rows; wherein the searching includes: selecting, in a row of the portion of the digital image, segments comprising a number of consecutive blocking artifacts that is larger than a predetermined first threshold; computing a blocking artifact level, per row, on the basis of values of pixels of the selected segments; and determining the grid row based on a comparison of the blocking artifact levels of a current row and a set of neighboring rows.