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Fast intra coding based on CU size decision and direction mode decision for HEVC

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Abstract

High Efficiency Video Coding (HEVC) adopts a quad-tree structured coding unit (CU) and more prediction unit (PU) modes are used in all CU depth levels. These improvements bring better coding performance, but the exhaustive search process for optimal CU and PU selection causes higher computational complexity than earlier standards. To speed up the encoder, this paper proposes a fast intra coding algorithm. Firstly, a fast CU size decision method is introduced, which selects different depth decision methods for each largest coding unit. Secondly, a fast direction mode decision method is proposed. It first compares the direction modes of the parent unit and most probable modes (MPMs) list, and then the first direction mode of rate-distortion optimization (RDO) list is used to early terminate the RDO process. Experimental results show that compared with HM 10.0, the proposed algorithm achieves 47% time reduction, whereas the value of BDBR is only 0.7%.

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Acknowledgments

This research is supported by the National Natural Science Foundation of China (Grant No. 61271113) and the Ph. D Programs Foundation of Ministry of Education of China (Grant No. 20131101120028 and 20131101120029).

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Authors and Affiliations

  1. Shool of Information and Electronics, Beijing Institute of Technology, Beijing, 100081, China

    Yue Ma, Zhaoyi Liu, Xinghua Wang & Shan Cao

  2. School of Communication and Information Engineering, Shanghai University, Shanghai, 200444, China

    Shan Cao

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  1. Yue Ma
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  2. Zhaoyi Liu
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Correspondence to Shan Cao.

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Ma, Y., Liu, Z., Wang, X. et al. Fast intra coding based on CU size decision and direction mode decision for HEVC. Multimed Tools Appl 77, 14907–14929 (2018). https://doi.org/10.1007/s11042-017-5074-2

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  • DOI: https://doi.org/10.1007/s11042-017-5074-2

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