Rate-distortion-complexity optimization for x265 |
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| Affiliation: | 1. The State Key Laboratory of Integrated Services Networks, Xidian University, 710071, China;2. The School of Electronics and Information, Northwestern Polytechnical University, 710129, China;1. School of Architecture, South China University of Technology, Guangzhou 510641, China;2. Foreign Language Teaching Department, Guang Zhou Vocational School of Finance and Economics, Guang Zhou 510080, China;3. School of Financial Mathematics and Statistics, GuangDong University of Finance, Guangzhou 510521, China;1. Department of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China;2. College of information, Liaoning University, Liaoning 110036, China;1. School of Computer Science and Technology, Henan Polytechnic University, Jiaozuo 454001, China;2. School of Computer Science, Shaanxi Normal University, Xi’an 710119, China;3. School of Computer Science and Technology, Nanjing Normal University, Nanjing 210046, China;4. College of Electronics and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China |
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| Abstract: | Rate-distortion optimization (RDO) is conventionally based on the analysis of rate-distortion (R-D) curve to minimize the coding distortion under the coding bits constraint. However, it is necessary to consider the computational complexity in the RDO process. In this paper, we obtain the Confidence LEvel - Computational complexity (CLEC) curves which indicate the characteristics of coding tree units (CTUs). Based on the CLEC curves, a rate-distortion-complexity optimization (RDCO) algorithm is proposed to optimize R-D under given computational complexity and achieve the optimal coding performance for x265. Experimental results demonstrate that the proposed algorithm can achieve a wide range of encoding speed under a given quantization parameter (QP) whereas the original x265 can only achieve a few fixed encoding speeds, and the proposed algorithm can reduce the BD-rate and increase the BD-PSNR by 6.59% and 0.13 dB on average under the same requirements of encoding speeds as the original x265. |
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| Keywords: | Rate-distortion-complexity optimization (RDCO) X265 High Efficiency Video Coding (HEVC) Computational complexity allocation |
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