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Lagrange optimization in high efficiency video coding for SATD-based intra-mode decision

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Abstract

The Lagrange optimization scheme plays a significant role in H.265/HEVC for mode decision targeting high compression performance. Here the intra-35 prediction modes are evaluated by the operations of rough mode decision (RMD) and rate-distortion optimization. For the first stage of RMD, the selection of Lagrange multiplier is however unsuitable for SATD-based intra-mode decision, which is determined by taking the square root of the Lagrange multiplier based on SSE distortion measurement. Moreover, the related bit-rate regarding RMD is only concerned with the prediction mode index with negligible residuals in Lagrange optimization. In this paper, an efficient Lagrange optimization is proposed for SATD-based intra-mode decision. Firstly the Lagrange multiplier in RMD is derived through the analysis of theoretical rate-distortion optimization. Then in terms of entropy coding principle, the bit-rate of Hadamard transformed residuals is estimated according to the related syntax elements. The experimental results demonstrate the effectiveness of the proposed Lagrange optimization for SATD-based intra-mode decision in H.265/HEVC.

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Acknowledgements

This work was supported by the National Science Foundation of China (61671376, 61671374) and the School Scientific Research Project (108/256211407).

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Authors and Affiliations

  1. Department of Digital Media Technology, Xi’an University of Technology, Jinhua Road, Xi’an, China

    Wei Li, Fan Zhao & Erhu Zhang

  2. School of Telecommunication Engineering, Xidian University, No. 2 Taibai street, Xi’an, China

    Peng Ren

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  1. Wei Li
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  2. Fan Zhao
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  3. Erhu Zhang
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Correspondence to Wei Li.

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Li, W., Zhao, F., Zhang, E. et al. Lagrange optimization in high efficiency video coding for SATD-based intra-mode decision. SIViP 11, 1163–1170 (2017). https://doi.org/10.1007/s11760-017-1071-1

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  • DOI: https://doi.org/10.1007/s11760-017-1071-1

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