Patent ID: 7095787

Claim:
A coding distortion removal method for removing coding distortion in an area disposed on both sides of a boundary line between a first block and an adjacent second block in an interlaced picture composed of odd-line pixels and even-line pixels and having a plurality of blocks forming a moving picture image, the first block being a frame structure block having a specific number of odd-line pixels and a specific number of even-line pixels of the interlaced picture, and the second block being a field structure block having one field composed of a specific number of odd-line pixels of the interlaced picture, and another field composed of a specific number of even-line pixels of the interlaced picture, the coding distortion removal method comprising: converting the first block from a frame structure block to a field structure block; comparing a difference of pixel values in pixels of the second block and pixel values in pixels of the converted first block with a specific threshold value; and removing coding distortion based on the result of the comparison.