Browsing by Author "Cheng, Chao-chung"

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Deblocking filtering method used on video encoding/decoding and apparatus thereof
(2006-11-23)
Cheng, Chao-chung
;
Chang, Tian-sheuan
;
Lin, Tien-hung
A deblocking filtering method used on video encoding/decoding includes: sequentially reading the subblocks adjacent to a vertical edge according to a deblocking direction, and performing a deblocking process on the vertical edge; performing a transposition on the pixel data of a current subblock; performing the deblocking process on a parallel edge of the current subblock, and outputting the pixel data of another subblock adjacent to the parallel edge after transposition; sequentially storing a plurality of current subblocks; transposing and outputting the pixel data of the plurality of current subblocks after completion of the deblocking of the current macroblock.
Method and apparatus for selecting intra prediction mode
(2006-11-23)
Cheng, Chao-chung
;
Chang, Tian-sheuan
;
Tsai, Chi-ken
A method for selecting intra prediction mode includes: calculating an error value for each of the prediction modes in a first group, wherein the first group includes two prediction modes where an included angle between their prediction directions is the largest; calculating an error value for each of the prediction modes in a second group, wherein the prediction modes in the second group refer to the prediction modes with prediction directions near the two sides of the prediction direction of the prediction mode with smaller error value in the first group; calculating an error value for the prediction mode in a third group, wherein the prediction mode in the third group is the prediction mode with prediction direction adjacent to the prediction direction of the prediction mode with smaller error value in the second group; calculating a DC prediction mode in the plurality of prediction modes; and among the prediction modes with calculated error values, selecting a prediction mode with a smallest error value to be the intra prediction mode for encoding the subblock.