Patent ID: 7970061
Filing Date: 2011-06-28
Classification: G01R

Abstract:
1. A block distortion removal method for removing block distortion included in the decoded image obtained by decoding the code sequences which are obtained by dividing an image into blocks each comprising plural pixels to be coded including: a first decision step which decides the strength of the block distortion at the block boundary: a second decision step which decides the necessity or the innecessity of the removal of the block distortion by using the decision result by said first decision step; and a block distortion decision step which removes the block distortion by using a filter selected by the decision result by said first decision step when it is decided by the result by said second decision step that block distortion removal is necessary; wherein said first decision step decides the strength of the block distortion by using an amplitude information of a motion vector which corresponds to a block neighboring to said block boundary; and wherein said second decision step decides that the removal of the block distortion is not necessary when said first decision step decides that there is no block distortion as the strength of the block distortion, and decides that the removal of block distortion is not necessary when an absolute value of the difference of each pixel value corresponding to plural pixels which locate in the vicinity of said block boundary and belong to the same block is bigger than a predetermined threshold, even if said first decision step decides that there is a block distortion and the distortion is the strength of the predetermined block distortion.