TY - JOUR
T1 - Cascaded mode decision for MPEG-2 to H.264/AVC intra frame transcoding
AU - Lin, Yinyi
AU - Wu, Jyun De
N1 - Funding Information:
1The authors are with the Department of Communication Engineering Department, National Central University, Chung Li, Taiwan 32054, R.O.C.(e-mail: [email protected]). This work was supported by the National Science Council, Taiwan, R.O.C. under Grant Number NSC 98-2221-E-008-062.
PY - 2009/11
Y1 - 2009/11
N2 - The newest international video-coding standard H.264/AVC significantly achieves better coding performance compared to prior video coding standards such as MPEG-2, which has been widely used in today's digital video applications. To provide the interoperability between MPEG-2 and H.264/AVC, in this paper we propose an efficient cascaded mode decision for MPEG-2 to H.264/AVC intra frame transcoding, which is accomplished in two stages. In the first stage, the lowfrequency AC components of discrete cosine transform (DCT) block of a MB is used to select I4MB or I16MB mode prediction; while in the second stage sum of absolute Hadamard transform differences (SATD) coefficients, including SATD value and its variance, is used to skip improper modes for rate distortion optimization (RDO) mode decision. The experimental results, conducted on JM12.2 with fast C8MB mode decision, reveal that over 49% of computation time on average can be saved, while preserving good coding performance when compared with complex cascaded pixel domain transcoding (CCPDT); or 85% (a speed up factor of 7) when compared with CCPDT without considering fast C8MB. The coding performance is also compared with two other distinct algorithms [3], [4], and the results demonstrate that the proposed algorithm momentously outperforms these two algorithms in all three respects (PSNR, bit rate as well as computation time1
AB - The newest international video-coding standard H.264/AVC significantly achieves better coding performance compared to prior video coding standards such as MPEG-2, which has been widely used in today's digital video applications. To provide the interoperability between MPEG-2 and H.264/AVC, in this paper we propose an efficient cascaded mode decision for MPEG-2 to H.264/AVC intra frame transcoding, which is accomplished in two stages. In the first stage, the lowfrequency AC components of discrete cosine transform (DCT) block of a MB is used to select I4MB or I16MB mode prediction; while in the second stage sum of absolute Hadamard transform differences (SATD) coefficients, including SATD value and its variance, is used to skip improper modes for rate distortion optimization (RDO) mode decision. The experimental results, conducted on JM12.2 with fast C8MB mode decision, reveal that over 49% of computation time on average can be saved, while preserving good coding performance when compared with complex cascaded pixel domain transcoding (CCPDT); or 85% (a speed up factor of 7) when compared with CCPDT without considering fast C8MB. The coding performance is also compared with two other distinct algorithms [3], [4], and the results demonstrate that the proposed algorithm momentously outperforms these two algorithms in all three respects (PSNR, bit rate as well as computation time1
KW - H.264/AVC
KW - Intra mode decision
KW - Rate distortion optimization (RDO)
KW - Rate-distortion cost function
KW - ρ-domain model
UR - http://www.scopus.com/inward/record.url?scp=75449095037&partnerID=8YFLogxK
U2 - 10.1109/TCE.2009.5373784
DO - 10.1109/TCE.2009.5373784
M3 - 期刊論文
AN - SCOPUS:75449095037
SN - 0098-3063
VL - 55
SP - 2172
EP - 2177
JO - IEEE Transactions on Consumer Electronics
JF - IEEE Transactions on Consumer Electronics
IS - 4
M1 - 5373784
ER -