赵振军,沈礼权,胡乾乾,张兆杨.基于复杂度HEVC码率控制的算法优化[J].光电子激光,2014,(9):1715~1720 |
基于复杂度HEVC码率控制的算法优化 |
Algorithm optimization based on the complexity of HEVC rate control |
投稿时间:2014-05-24 |
DOI: |
中文关键词: 码率控制 复杂度 树型结构 残差变换 高斯分布 |
英文关键词:rate control complexity tree structure residues transform Gaussian distribu tion |
基金项目:国家自然科学基金(61171084、60832003)和上海市青年科技启明星计划 (11QA 1402400)资助项目 (1.新型显示技术与应用集成教育部重点实验室,上海 200072; 2.上海大学 通信与信息工 程学院,上海 200072) |
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中文摘要: |
针对视频编码标准HEVC(high efficiency video coding)在编码过程中复杂度较高的帧层带宽相对不足而复杂度较低的帧层带宽相 对富余之一的问题,为了降低计算复杂度,提高编码质量,本文首先通过研究复杂 度在 帧层编码过程中对码率分配的影响,提出了由SATD(sum of absolute transformed differe nce) 构建复杂度模型,根据视频内容每帧的复杂程度,通过复杂度模型对帧层进行合理的比特分 配。为了建立R-Q曲线,结合最大编码单元(LCU,largest codi ng unit)层的编码树特点,根据LCU残差信 号的混合高斯分布特性进行量化参数(QP)的计算,从而使得输 出码率与目标比特相等的同时 尽可能提高视频质量。实验结果表明,所提出的算法比HEVC现行码率控制算法性能更加 优良并且具有较强的鲁棒性,码率误差在0.01%以内,P SNR增益平均可达0.21dB。 |
英文摘要: |
The rate control mechanism of high efficiency video coding (HEVC) is using the average of the bandwidth in frame layer,rather than adjusing the target bits acc o rding to the complexity of the current video,which makes the encoding process of high comple xity frame layers′ bandwidth insufficient relatively,while the complexity of the l ower frame layers′ bandwidth surplus relatively.To solve those problems,in order to reduce the comp utational complexity and improve the quality of coding,firstly,this paper has researched the effect of complexity in the process of coding frame layer on the rate allocation.According to th e complexity of the video content per frame,it allocates bits by the frame layer complexity model reasonably.Secondly,in order to establish R-Q curve,it combines the larges t coding unit (LCU) tree characteristics and the Gaussian mixture distribu tion characteristics of the LCUs′s residual signal to calculate parameters,so as to make the output bit rate equal to the target bits.Experimental results demonstrate that the proposed method is better than HEVC′s rate control algorithm and it is of better performance and strong robustness,the ra te of error is in 0.01% and the average peak signal-to-noise ratio (PSNR) is up to 0.21dB. |
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