| 摘要(英) |
High efficiency video coding (HEVC) is the latest video coding standard. The coding unit(CU) of HEVC uses a quadtree-based coding structure to increase coding performance. To improve predict more accurately, using 35 prediction modes in intra prediction. This process which is meant to improve the efficiency in HEVC intra prediction however leads to a significantly higher computational complexity. Hence, in this paper, we proposed an SVM based fast intra CU depth decision algorithm to reduce the computational complexity. It is convenient to develop the criterion of early CU splitting and termination by applying SVM with features, including Variance, low-frequency AC value, and neighboring CU depth. After that, we utilize two methods to speed up the intra coding prediction. In intra prediction, HEVC adopt RMD algorithm which 8,8,3,3,3 modes for candidates list in different PU size. In our intra mode decision, the modes with larger SATD cost are removed from candidate list of RDO process. The threshold is adaptive by block size and QP. In CU, we used SVM again to fast the criterion of early CU splitting and termination. The experimental results show that our proposed algorithm achieves 25.45% encoding time saving on average without significant degradation of coding performance. |
| 參考文獻 |
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[7] J. Sullivan, J.-R. Ohm, W.-J. Han and T. Wiegand, “Overview of the High Efficiency Video Coding (HEVC) Standard,” Pre-publication Draft, To Appear in IEEE Transactions on Circuits and Systems for Video Technology, pp. 1-19, Dec. 2012.
[8] Liquan Shen, Zhaoyang Zhang, Ping An, “Fast CU Size Decision and Mode Decision Algorithm for HEVC Intra Coding”, IEEE Transactions on Consumer Electronics, vol. 59, no 1, Feb.2013
[9] LIBSVM—A Library for Support Vector, Machineshttp://www.csie.ntu.edu.tw/~cjlin/libsvm/index.html
[10] Yang Wang, Xiaopeng Fan, Liang Zhao, Siwei Ma, Debin Zhao, Wen Gao, “A Fast intra coding Algorithm for HEVC”, IEEE International Conference on Image Processing(ICIP),10.1109/ICIP.2014.7025836, Oct.2014
[11] Han-Yuan Hsu, “Low Computational Complexity, High Coding Efficiency Intra Prediction for HEVC,” Master Thesis, National Central University, Jun. 2016.
[12] Deyuan Liu, Xingang Liu, and Yayong Li “Fast CU Size Decisions for HEVC Intra Frame Coding Based on Support Vector Machines”, Dependable, Autonomic and Secure Computing, 14th Intl Conf on Pervasive Intelligence and Computing, 2nd Intl Conf on Big Data Intelligence and Computing and Cyber Science and Technology Congress (DASC/PiCom/DataCom/CyberSciTech), 2016 IEEE 14th Intl C, 10.1109/DASC-PICom-DataCom-CyberSciTec.2016.168, Aug. 2016 |
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