| 引用本文: | 冯磊,戴明,孙丽娜,赵春蕾.利用信息熵判定HEVC预测单元尺寸快速算法[J].哈尔滨工业大学学报,2016,48(9):164.DOI:10.11918/j.issn.0367-6234.2016.09.028 |
| FENG Lei,DAI Ming,SUN Lina,ZHAO Chunlei.An algorithm of fast HEVC PU size decision using information entropy[J].Journal of Harbin Institute of Technology,2016,48(9):164.DOI:10.11918/j.issn.0367-6234.2016.09.028 |
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| 摘要: |
| 为提高HEVC编码器的帧内预测速度，提出一种基于信息熵的high efficiency video coding (HEVC) 帧内预测单元(PU)尺寸快速判定算法. 利用图像的信息熵随图像中细节的丰富程度产生不同的值这一特性，判断PU是否需要进行分割处理. 首先计算每个LCU的信息熵，根据信息熵的结果从64×64至4×4的PU中找到最优的分割尺寸，进而确定最佳编码深度，再从该编码深度内进行帧内角度预测. 实验结果表明，在保证编码性能基本不变的前提下，帧内预测编码时间平均缩短了约22.6%. 该算法精简了遍历搜索模式中不必要的率失真代价计算过程，在保证图像质量的前提下，缩短了帧内预测编码时间.
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| 关键词: HEVC 视频压缩 帧内预测 图像分割 图像信息熵 |
| DOI：10.11918/j.issn.0367-6234.2016.09.028 |
| 分类号:TN941.1 |
| 文献标识码:A |
| 基金项目:空军装备预研基金(402040205) |
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| An algorithm of fast HEVC PU size decision using information entropy |
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FENG Lei1,2,DAI Ming1,SUN Lina1,ZHAO Chunlei1,2
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(1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; 2.University of Chinese Academy of Sciences, Beijing 100039, China)
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| Abstract: |
| In order to improve the prediction speed of HEVC encoder, this paper proposed an algorithm of PU size decision based on information entropy for HEVC (High Efficiency Video Coding) intra prediction. This algorithm mainly utilizes the characteristic of image entropy producing different values with the richness of the image detail to decide whether the PUs need segmentation. Firstly, we calculate the information entropy of every LCU, then we can obtain the optimal partition size from the PU size of 64×64 to 4×4, so that the optimal coding depth is acquired, we can make the intra angular prediction in the optimal coding depth. The experimental results show that we can avoid the unnecessary RD cost calculating process in the traversal search mode, and the coding time was reduced by about 22.6% in the promise of coding performance essentially unchanged. This algorithm simplified the unnecessary rate-distortion cost procedure in traversal search mode, shortened the intra prediction coding time at high image quality level.
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| Key words: HEVC video compression intra prediction image segmentation information entropy |
