高效视频编码中帧内码率控制改进算法
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摘要
针对失真漂移现象造成码率拉格朗日因子(R-λ)模型编码效率低的问题,提出一种考虑区域间失真关联性的高效视频编码(HEVC)帧内码率控制改进算法。首先根据帧内预测编码原理,对编码区域间的失真关联性进行分析,得到漂移的失真、当前失真与总失真之间的关系;然后利用编码像素值、参考像素值和参考像素重构值,准确地预测出漂移的失真值;最后结合传统的R-λ模型,获取基于失真漂移的拉格朗日因子λ,继而建立更准确的R-λ模型。实验结果表明,与原始的帧内码率控制算法相比,在相同的码率下所提算法可将编码码率平均降低1.7%,重构视频的峰值信噪比平均提高0.1 dB,证明所提算法的编码效率得到提升,且编码时间增幅非常小。
A modified method for intra-coding rate control in high efficiency video coding(HEVC) is proposed to solve lower coding efficiency of the rate-Lagrange(R-λ) model caused by distortion drift. The method considers the distortion relevance among the video areas. According to the intra-frame prediction coding principle, the distortion relevance among coding-blocks is firstly analyzed to obtain the relationship of drift distortion, current distortion, and total distortion. Then the value of distortion drift is accurately predicted by utilizing the value of coding pixels, the value of reference pixels, and the value of reconstructed reference pixels. The traditional R-λ model is finally used to obtain the Lagrange factor λ based on distortion drift and to derive a more accurate R-λ model. Experimental results and a comparison with the original scheme show that the proposed method gets a reduction of about 1.7% in bit-rate and an improvement of about 0.1 dB in PSNR of the reconstructed video in keeping the same bit-rate, and that the proposed method improves the coding efficiency with a slight increase in time-consumption.
A modified method for intra-coding rate control in high efficiency video coding(HEVC) is proposed to solve lower coding efficiency of the rate-Lagrange(R-λ) model caused by distortion drift. The method considers the distortion relevance among the video areas. According to the intra-frame prediction coding principle, the distortion relevance among coding-blocks is firstly analyzed to obtain the relationship of drift distortion, current distortion, and total distortion. Then the value of distortion drift is accurately predicted by utilizing the value of coding pixels, the value of reference pixels, and the value of reconstructed reference pixels. The traditional R-λ model is finally used to obtain the Lagrange factor λ based on distortion drift and to derive a more accurate R-λ model. Experimental results and a comparison with the original scheme show that the proposed method gets a reduction of about 1.7% in bit-rate and an improvement of about 0.1 dB in PSNR of the reconstructed video in keeping the same bit-rate, and that the proposed method improves the coding efficiency with a slight increase in time-consumption.
引文
[1]FLYNN D,MARPE D,NACCARI M,et al.Overview of the range extensions for the HEVC standard:tools,profiles,and performance[J].IEEE Transactions on Circuits and Systems for Video Technology,2016,26(1):4-19.
[2]李维,张和仙,杨付正.高效率视频编码快速模式判决算法[J].西安交通大学学报,2013,47(8):104-109.LI Wei,ZHANG Hexian,YANG Fuzheng.A fast mode decision algorithm for high efficiency video coding[J].Journal of Xi’an Jiaotong University,2013,47(8):104-109.
[3]WANG S,LUO F,MA S,et al.Low complexity encoder optimization for HEVC[J].Journal of Visual Communication and Image Representation,2016,35:120-131.
[4]TONG T,LING L.Rate control for non-uniform video in HEVC[J].Journal of Visual Communication and Image Representation,2017,48:254-267.
[5]司俊俊,马思伟,王诗淇.一种基于变换系数拉普拉斯分布的HEVC码率控制算法[J].上海大学学报(自然科学版),2013,19(3):229-234.SI Junjun,MA Siwei,WANG Shiqi.Laplace distribution based rate control algorithm for HEVC[J].Journal of Shanghai University(Natural Science Edition),2013,19(3):229-234.
[6]CHOI H,YOO J,NAM J,et al.Pixel-wise unified rate-quantization model for multi-level rate control[J].IEEE Journal on Selected Topics in Signal Processing,2013,7(6):1112-1123.
[7]LIANG X,WANG Q,ZHOU Y,et al.A novel R-Qmodel based rate control scheme in HEVC[C]∥2013IEEE International Conference on Visual Communications and Image Processing.Piscataway,NJ,USA:IEEE,2013:6706343.
[8]LI B,LI H,LI L,et al.λdomain rate control algorithm for high efficiency video coding[J].IEEETransactions on Image Processing,2014,23(9):3841-3854.
[9]苏洪磊,李兵兵,杨付正.H.264/AVC网络视频编码失真评估的比特流层模型[J].西安交通大学学报,2012,46(6):36-41.SU Honglei,LI Bingbing,YANG Fuzheng.A bitstream-layer model for assessing coding distortion of H.264/AVC networked video[J].Journal of Xi’an Jiaotong University,2012,46(6):36-41.
[10]LI Y,JIA H,XIE X,et al.Rate control for consistent video quality with inter-dependent distortion model for HEVC[C]∥2016IEEE Visual Communications and Image Processing Conference.Piscataway,NJ,USA:IEEE,2016:7805594.
[11]LIU M,REN P,XIANG Z.Frame-level bit allocation for hierarchical coding of H.265/HEVC considering dependent rate-distortion characteristics[J].Signal,Image and Video Processing,2016,10(8):1457-1463.
[12]ZHOU M,ZHANG Y,LI B,et al,Complexity-based intra frame rate control by jointing inter-frame correlation for high efficiency video coding[J].Journal of Visual Communication and Image Representation,2017,42:46-64.
[13]KUO C,SHIH Y,YANG S.Rate control via adjustment of Lagrange multiplier for video coding[J].IEEE Transactions on Circuits and Systems for Video Technology,2016,26(11):2069-2078.
[14]LI B,LI H,LI L.Rate control by R-lambda model for HEVC[C]∥Proceedings of the 11th JCTVC Meeting.Geneva,Switzerland:ITU,2012:1-9.
[15]TARIQ J,KWONG S,YUAN H.HEVC intra mode selection based on rate distortion cost and sum of absolute difference[J].Journal of Visual Communication and Image Representation,2016,35:112-119.
[16]CHEN H,ZHANG T,SUN M,et al.Improving intra prediction in high-efficiency video coding[J].IEEETransactions on Image Processing,2016,25(8):3671-3682.
[17]TU Y K,YANG J F,SUN M T.Efficient ratedistortion modeling for efficient H.264/AVC encoding[J].IEEE Transactions on Circuits and Systems for Video Technology,2007,17(5):530-543.
[18]LI S,ZHU C,GAO Y,et al.Lagrangian multiplier adaptation for rate-distortion optimization with interframe dependency[J].IEEE Transactions on Circuits and Systems for Video Technology,2016,26(1):117-129.
[19]LI W,ZHAO F,ZHANG E,et al.Lagrange optimization in high efficiency video coding for SATD-based intra mode decision[J].Signal,Image and Video Processing,2017,11(6):1163-1170.
[20]BOSSEN F.Common test conditions and software reference configurations[C]∥Proceedings of the 15th JCTVC Meeting.Geneva,Switzerland:ITU,2013:1-4.
[21]HJONTEGAARD G.Calculation of average PSNRdifferences between RD-curves[EB/OL].(2001-03-26)[2017-05-18].http:∥wftp3.itu.int/av-arch/video-site/0104_Aus/VCEG-M33.doc.
[2]李维,张和仙,杨付正.高效率视频编码快速模式判决算法[J].西安交通大学学报,2013,47(8):104-109.LI Wei,ZHANG Hexian,YANG Fuzheng.A fast mode decision algorithm for high efficiency video coding[J].Journal of Xi’an Jiaotong University,2013,47(8):104-109.
[3]WANG S,LUO F,MA S,et al.Low complexity encoder optimization for HEVC[J].Journal of Visual Communication and Image Representation,2016,35:120-131.
[4]TONG T,LING L.Rate control for non-uniform video in HEVC[J].Journal of Visual Communication and Image Representation,2017,48:254-267.
[5]司俊俊,马思伟,王诗淇.一种基于变换系数拉普拉斯分布的HEVC码率控制算法[J].上海大学学报(自然科学版),2013,19(3):229-234.SI Junjun,MA Siwei,WANG Shiqi.Laplace distribution based rate control algorithm for HEVC[J].Journal of Shanghai University(Natural Science Edition),2013,19(3):229-234.
[6]CHOI H,YOO J,NAM J,et al.Pixel-wise unified rate-quantization model for multi-level rate control[J].IEEE Journal on Selected Topics in Signal Processing,2013,7(6):1112-1123.
[7]LIANG X,WANG Q,ZHOU Y,et al.A novel R-Qmodel based rate control scheme in HEVC[C]∥2013IEEE International Conference on Visual Communications and Image Processing.Piscataway,NJ,USA:IEEE,2013:6706343.
[8]LI B,LI H,LI L,et al.λdomain rate control algorithm for high efficiency video coding[J].IEEETransactions on Image Processing,2014,23(9):3841-3854.
[9]苏洪磊,李兵兵,杨付正.H.264/AVC网络视频编码失真评估的比特流层模型[J].西安交通大学学报,2012,46(6):36-41.SU Honglei,LI Bingbing,YANG Fuzheng.A bitstream-layer model for assessing coding distortion of H.264/AVC networked video[J].Journal of Xi’an Jiaotong University,2012,46(6):36-41.
[10]LI Y,JIA H,XIE X,et al.Rate control for consistent video quality with inter-dependent distortion model for HEVC[C]∥2016IEEE Visual Communications and Image Processing Conference.Piscataway,NJ,USA:IEEE,2016:7805594.
[11]LIU M,REN P,XIANG Z.Frame-level bit allocation for hierarchical coding of H.265/HEVC considering dependent rate-distortion characteristics[J].Signal,Image and Video Processing,2016,10(8):1457-1463.
[12]ZHOU M,ZHANG Y,LI B,et al,Complexity-based intra frame rate control by jointing inter-frame correlation for high efficiency video coding[J].Journal of Visual Communication and Image Representation,2017,42:46-64.
[13]KUO C,SHIH Y,YANG S.Rate control via adjustment of Lagrange multiplier for video coding[J].IEEE Transactions on Circuits and Systems for Video Technology,2016,26(11):2069-2078.
[14]LI B,LI H,LI L.Rate control by R-lambda model for HEVC[C]∥Proceedings of the 11th JCTVC Meeting.Geneva,Switzerland:ITU,2012:1-9.
[15]TARIQ J,KWONG S,YUAN H.HEVC intra mode selection based on rate distortion cost and sum of absolute difference[J].Journal of Visual Communication and Image Representation,2016,35:112-119.
[16]CHEN H,ZHANG T,SUN M,et al.Improving intra prediction in high-efficiency video coding[J].IEEETransactions on Image Processing,2016,25(8):3671-3682.
[17]TU Y K,YANG J F,SUN M T.Efficient ratedistortion modeling for efficient H.264/AVC encoding[J].IEEE Transactions on Circuits and Systems for Video Technology,2007,17(5):530-543.
[18]LI S,ZHU C,GAO Y,et al.Lagrangian multiplier adaptation for rate-distortion optimization with interframe dependency[J].IEEE Transactions on Circuits and Systems for Video Technology,2016,26(1):117-129.
[19]LI W,ZHAO F,ZHANG E,et al.Lagrange optimization in high efficiency video coding for SATD-based intra mode decision[J].Signal,Image and Video Processing,2017,11(6):1163-1170.
[20]BOSSEN F.Common test conditions and software reference configurations[C]∥Proceedings of the 15th JCTVC Meeting.Geneva,Switzerland:ITU,2013:1-4.
[21]HJONTEGAARD G.Calculation of average PSNRdifferences between RD-curves[EB/OL].(2001-03-26)[2017-05-18].http:∥wftp3.itu.int/av-arch/video-site/0104_Aus/VCEG-M33.doc.