| HEVC 熵编码算法优化 |
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| 引用本文： | 徐飞,张永飞,李哲.HEVC 熵编码算法优化[J].计算机与现代化,2013(12):1-4. |
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| 作者姓名： | 徐飞 张永飞 李哲 |
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| 作者单位： | 北京航空航天大学计算机学院数字媒体北京市重点实验室;北京航空航天大学虚拟现实技术与系统国家重点实验室 |
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| 基金项目： | 国家自然科学基金资助项目(61272502) |
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| 摘 要： | 新一代视频编码标准HEVC提供了更加灵活的编码工具选择，在提高压缩率的同时也提高了编码的计算复杂度。由于可选择更大的变换单元以及编码中更强的系数间依赖关系，在率失真优化（RDO）模式选择过程中，HEVC熵编码的计算复杂度显著高于H．264/AVC。为了解决这一问题，本文对HEVC熵编码算法进行优化，通过优化熵编码的上下文空间选择过程、非零系数的编码结构，以及对不同大小的变换矩阵进行整体优化。实验结果表明，本文提出的优化算法能够在保证视频编码质量基本不变的同时，平均降低约43％的熵编码时间。
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| 关 键 词： | 视频编码 HEVC 熵编码 |
Optimization Algorithm of HEVC Entropy Coding |
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| XU Fei;ZHANG Yong-fei;LI Zhe.Optimization Algorithm of HEVC Entropy Coding[J].Computer and Modernization,2013(12):1-4. |
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| Authors: | XU Fei;ZHANG Yong-fei;LI Zhe |
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| Affiliation: | XU Fei;ZHANG Yong-fei;LI Zhe;Beijing Key Laboratory of Digital Media,School of Computer Science and Engineering,Beihang University;State Key Laboratory of Virtual Reality Technology and Systems,Beihang University; |
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| Abstract: | The latest video compression standard HEVC adopts more flexible compression tools to reach a higher compression rate compared to its predecessor H .264/AVC, meanwhile the computation of HEVC is more complicated .Mainly because the larger Transform Unit and the stronger dependence between transform coefficient , entropy coding of HEVC in RDO （ Rate-Distortion Op-timization） is much more complex than that in H .264/AVC.This paper proposed several techniques to optimize the entropy cod-ing process of HEVC , including context selection optimization , significant coefficient coding optimization and different size coeffi-cient block optimization .Experiment results show that the proposed schemes can reduce on average 43% of the entropy coding time in RDO without losing compression performance . |
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| Keywords: | video compression HEVC entropy coding |
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