標題: Fast Context-Adaptive Mode Decision Algorithm for Scalable Video Coding With Combined Coarse-Grain Quality Scalability (CGS) and Temporal Scalability
作者: Lin, Hung-Chih
Peng, Wen-Hsiao
Hang, Hsueh-Ming
資訊工程學系
電子工程學系及電子研究所
Department of Computer Science
Department of Electronics Engineering and Institute of Electronics
關鍵字: Coarse-grain quality scalability;encoder optimization;fast mode decision;scalable video coding (SVC)
公開日期: 1-May-2010
摘要: To speed up the H.264/MPEG scalable video coding (SVC) encoder, we propose a layer-adaptive intra/inter mode decision algorithm and a motion search scheme for the hierarchical B-frames in SVC with combined coarse-grain quality scalability (CGS) and temporal scalability. To reduce computation but maintain the same level of coding efficiency, we examine the rate-distortion (R-D) performance contributed by different coding modes at the enhancement layers (EL) and the mode conditional probabilities at different temporal layers. For the intra prediction on inter frames, we can reduce the number of Intra4x4/Intra8x8 prediction modes by 50% or more, based on the reference/base layer intra prediction directions. For the EL inter prediction, the look-up tables containing inter prediction candidate modes are designed to use the macroblock (MB) coding mode dependence and the reference/base layer quantization parameters (Qp). In addition, to avoid checking all motion estimation (ME) reference frames, the base layer (BL) reference frame index is selectively reused. And according to the EL MB partition, the BL motion vector can be used as the initial search point for the EL ME. Compared with Joint Scalable Video Model 9.11, our proposed algorithm provides a 20x speedup on encoding the EL and an 85% time saving on the entire encoding process with negligible loss in coding efficiency. Moreover, compared with other fast mode decision algorithms, our scheme can demonstrate a 7-41% complexity reduction on the overall encoding process.
URI: http://dx.doi.org/10.1109/TCSVT.2010.2045832
http://hdl.handle.net/11536/5464
ISSN: 1051-8215
DOI: 10.1109/TCSVT.2010.2045832
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
Volume: 20
Issue: 5
起始頁: 732
結束頁: 748
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