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《Journal of Optoelectronics·Laser》 2018-06
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Improved rate control algorithm based on R-λ model in high efficiency video coding

LI Qiang;XU He;Chongqing Key Laboratory of Signal and Information Processing,Chongqing University of Posts and Telecommunications;  
In order to improve coding performance of high efficiency video coding(HEVC),this paper proposes an improved rate control algorithm based on R-λmodel.Firstly,it utilizes gradient and mean absolute difference(MAD)weighting to represent the complexity of the gradient LCU layer image.Then,it employs the feedback information of the encoded units to further adjust the quantization parameters.Finally,the model parameters are updated by utilizing video coding distortion combined with Newton method.The experimental results show that the proposed method is better in coding performance and robustness than the current HEVC′s rate control algorithms.The average bit-error of the improved algorithm is reduced by 0.055%,the average luminance peak to noise ratio is increased by 0.07 dB compared with rate control algorithm for the HEVC standard,the average bit-error of the improved algorithm is reduced by 0.023%,and the average luminance peak to noise ratio is increased by 0.05 dB compared with the reference algorithms.
【Fund】: 国家自然科学基金(61102131);; 重庆市科委自然科学基金(cstc2016jcyjA0543)资助项目
【CateGory Index】: TN919.81
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