Patent ID: 7239755

Claim:
A method of reducing a blocking artifact appearing when coding a moving picture, comprising the steps of: defining pixels, S 0 , S 1 , and S 2 centering around a block boundary; obtaining a mode determination value to selectively determine a deblocking mode as a default mode or a DC offset mode in accordance with a degree of the blocking artifact; obtaining frequency information of the surroundings of the block boundary for each pixel, using a 4-point kernel, if the default mode is determined; adjusting a magnitude of a discontinuous component, belonging to the block boundary, to the minimum value of a magnitude of a discontinuous component, belonging to the surrounding of the block boundary, in a frequency domain, and applying said adjusting operation to a spatial domain; and reducing the blocking artifact in a smooth region where there is little motion, such as a setting, if the DC offset mode is determined.