Direct splitting and merging of 2-D DCT in the DCT domain

Authors:
Yuh-Jue Chuang;Ja-Ling Wu
Affiliations:
Department of Computer Science and Information Engineering, Communication and Multimedia Laboratory, Taiwan, ROC;Department of Computer Science and Information Engineering, Communication and Multimedia Laboratory, Taiwan, ROC and Graduate Institute of Networking and Multimedia, National Taiwan University, Ta ...
Venue:
Digital Signal Processing
Year:
2004

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Abstract

An efficient method for splitting an 8x8 2-D DCT block into four 4x4, two 8x4 (or 4x8) 2-D DCT blocks is presented in this paper. The reverse direction (the ''merge'' case) also can be realized by inverse transposing the given matrix operations in the ''split'' case. The computational complexity of the proposed methods is lower than that of the direct approach and other known efficient converting approaches. Due to its efficiency, the proposed DCT splitter/merger will play an important role in realizing the transcoding between the latest video coding standard, AVC/H.264, and the older ones, such as MPEG-1, MPEG-2, and MPEG-4 part 2.