METHOD FOR UP-SAMPLING/DOWN-SAMPLING DATA OF A VIDEO BLOCK

摘要

The present invention relates to a method for up- sampling/down-sampling data of a video block in a scalable video data encoding/decoding. The up -sampling method according to the present invention obtains a 2Nx2N enlarged block by computing a converting matrix to data of a given NxN video block. The converting block has matrix elements leading data of the video block to resultant data that could be obtained by a converting process that applies DCT to the data, pads some zeros to coefficients, and applies IDCT to the coefficients including the padded zeros. The down-sampling method according to the present invention obtains an NxN reduced block by computing a converting block to a given 2Nx2N video block. The converting block for reducing has matrix elements leading data of the 2Nx2N video block to resultant data that could be obtained by a converting process that applies DCT to the data, removes some coefficients from transformed coefficients, and applies IDCT to the remaining coefficients.