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Low complexity video transcoding algorithm from H.264 to HEVC |
JIANG Wei, TIAN Xiang, CHEN Yao-wu |
Institute of Advanced Digital Technology and Instrumentation, Zhejiang University, Zhejiang Provincial Key Laboratory for Network Multimedia Technologies, Hangzhou 310027, China |
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Abstract A low complexity video transcoding algorithm from H.264 video to the next generation video compression standard the high efficiency video coding (HEVC) was proposed in order to reduce the computational time consumed during the transcoding process. By making full use of the H.264 compressed video information included in the bitstream, the coding complexity of each frame was analyzed based on the correlation between image complexities and coding bits, and then the searching depth range was adaptively decided based on the analysis results. By exploiting the mapping correlations of Skip mode in HEVC and all modes in H.264, an early decision of Skip mode was then introduced. Through the statistical analysis of coding bits, a fast prediction unit partition selection for both symmetric and asymmetric partitions was described. Finally, the motion estimation process was optimized according to the motion similarity between H.264 and HEVC bitstreams. Experimental results show that, compared to the reference methods, the proposed algorithm achieves a significant improvement on transcoding speed, while maintaining similar rate-distortion performance.
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Published: 01 April 2015
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H.264到HEVC的低复杂度视频转码算法
针对H.264视频转码为下一代压缩标准高效电视编码(HEVC)视频过程中耗费大量时间的问题,提出一种低复杂度的视频转码算法.该算法充分利用H.264压缩视频流中包含的信息,基于图像复杂度和编码比特数之间的关系对每帧图像进行编码复杂度分析,并根据分析结果决定编码树单元的搜索深度范围;基于HEVC码流中Skip模式与H.264码流中各种模式的映射关系对Skip模式进行提前判决,通过对编码比特数的统计分析快速选择预测单元的对称与非对称分割模式;依据运动矢量的相似性,优化了HEVC运动估计过程中预测单元的搜索起点和搜索范围,进一步减少了转码过程的计算量.实验结果表明:该算法与参考算法相比转码速度获得了大幅提高,同时还保持了几乎相同的率失真表现.
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[1] WEIGAND T, SULLIVAN G J, BJNTEGAARD G, et al. Overview of the H.264/AVC video coding standard [J]. IEEE Transactions Circuits and Systems for Video Technology, 2003, 13(7): 560-576.
[2] SULLIVAN G J, OHM J R, HAN W J, et al. Overview of the high efficiency video coding (HEVC) standard [J]. IEEE Transactions Circuits and Systems for Video Technology, 2012, 22(12): 1649-1668.
[3] LI B, SULLIVAN G J, XU J Z. Comparison of compression performance of HEVC Draft 7 with AVC high profile [C]∥Document JCTVC-J0236. JCTVC. Stockholm, Sweden: JCTVC, 2012.
[4] AHMAD I, WEI X H, SUN Y, et al. Video transcoding: an overview of various techniques and research issues [J]. IEEE Transactions Multimedia, 2005, 7(5): 793-804.
[5] SU C J, LIN Y. Zero-block inter/intra mode decision for MPEG-2 to H.264/AVC inter P-frame transcoding [J]. IET Image Process,2010, 52(6): 494-504.
[6] MORIRON S, FARIA S, NAVARRO A, et al. Video transcoding from H.264/AVC to MPEG-2 with reduced computational complexity [J]. Signal Processing: Image Communication,2009, 24: 637-650.
[7] MARTINEZ J L, FERNANDEZ-ESCRIBANO G, KALVA H, et al. Wyner-Ziv to H.264 transcoder for low cost video encoding [J]. IEEE Transactions Consumer Electronics, 2009, 55(3): 1453-1461.
[8] KALVA H, KUNZELMANN P. Dynamic motion estimation for transcoding P frames in H.264 to MPEG-2 transcoders [J]. IEEE Transactions Consumer Electronics, 2008, 54(2): 657-662.
[9] BIALKOWSKI J, BARKOWSKY M, KAUP A. Fast video transcoding from h.263 to H.264/MPEG-4 AVC [J]. Multimedia Tools and Applications,2007, 35(2): 127-146.
[10] FERNNDEZ-ESCRIBANO G, KALVA H, MARTNEZ J L, et al. An MPEG-2 to H.264 video transcoder in the baseline profile [J]. IEEE Transactions Circuits and Systems for Video Technology,2010, 20(5): 763-768.
[11] FERNNDEZ-ESCRIBANO G, BIALKOWSKI J, GMEZ J A, et al. Low-complexity heterogeneous video transcoding using data mining [J]. IEEE Transactions Multimedia, 2008, 10(2): 286-299.
[12] LEE H S, KIM K Y, KIM T R, et al. Fast encoding algorithm based on depth of coding-unit for high efficiency video coding [J]. Optical Engineering, 2012, 51(6): 067402.
[13] TENG S W, HANG H M, CHEN Y F. Fast mode decision algorithm for residual quadtree coding in HEVC [C]∥IEEE Visual Communications and Image Processing (VCIP). Tainan: IEEE, 2011: 14.
[14] CHOI K, JANG E S. Early TU decision method for fast video encoding in high efficiency video coding [J]. Electronics Letters, 2012, 48(12): 689-691.
[15] PURNACHAND N, ALVES L N, NAVARRO A. Fast motion estimation algorithm for HEVC [C]∥ IEEE International Conference on Consumer Electronics (ICCE). Tainan: IEEE, 2012: 34-37.
[16] DAI W, AU O C, LI S J, et al. Fast sub-pixel motion estimation with simplified modeling in HEVC [C]∥ IEEE International Symposium on Circuits and Systems (ISCAS). Seoul, Korea (South): IEEE, 2012: 1560-1563.
[17] BOSSEN F. Common test conditions and software reference configurations \[C\]∥Document JCTVC-J1100, JCTVC. Stockholm, Sweden: JCTVC, 2012. |
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