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Enhanced inter-mode decision algorithm for HEVC/H.265 video coding

JOURNAL OF REAL-TIME IMAGE PROCESSING 2019年第2期16卷 377-390页

作者： Jaja, Edward Omar, Zaid Ab Rahman, Ab Zabidi, Muhammad Univ Teknol Malaysia Fac Elect Engn Johor Baharu 81310 Malaysia

The high efficiency video compression standard (HEVC) is the latest video engineering marvel that is designed to launch video coding towards the domain of the 8K. This new standard with all the advanced video coding techniques built into it has an overload of computational complexities, which result to very high latency in the encoding process. mode decision in this standard is one of the units that constitutes a significant fraction of the complexities. This work utilizes prediction residuals in the inter 2N x 2N part mode, in depths two and three, to prune down decisions over the four asymmetric motion partitions in each of these depths. Experimental results show that this algorithm offers a speedup of 72% at best when linked with the mode decision scheme implemented in HM14 reference software.

关键词： Enhanced mode decision mode decision algorithm HEVC video compression H.265 video coding

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Fast CU size decision and mode decision algorithm for intra prediction in HEVC

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MULTIMEDIA TOOLS AND APPLICATIONS 2017年第2期76卷 2001-2017页

作者： Song, Yun Zeng, Ye Li, Xueyu Cai, Biye Yang, Gaobo Changsha Univ Sci & Technol Sch Comp & Commun Engn Changsha Hunan Peoples R China Hunan Univ Sch Informat Sci & Engn Changsha Hunan Peoples R China Changsha Univ Sci & Technol Hunan Prov Key Lab Intelligent Proc Big Data Tran Changsha Hunan Peoples R China

In the intra prediction process, High Efficiency Video Coding (HEVC) provides a quadtree-based coding unit (CU) block partitioning structure and up to 35 kinds of prediction modes to improve the coding performance. These technologies improve the coding efficiency significantly while the coding complexity is simultaneously increased rapidly as well. In this paper, a novel fast CU size decision and mode decision algorithm is proposed for the intra prediction of HEVC. The overall algorithm consists of two processes, the fast CU size decision and fast mode decision. In the fast CU size decision process, we adopt an adaptive discretization total variation (DTV) threshold-based CU size determination algorithm to skip some specific depth levels. In the fast mode decision process, an orientation gradient-based mode decision is proposed to reduce the candidate modes involved in the rough mode decision (RMD) and the rate distortion optimization (RDO) process. The experimental results on the HEVC reference software HM demonstrate that the proposed algorithm can significantly reduce the coding time with negligible performance loss.

关键词： High efficiency video coding CU size decision mode decision algorithm Intra prediction

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A Depth Information Based Fast mode decision algorithm for Color Plus Depth-Map 3D Videos

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IEEE TRANSACTIONS ON BROADCASTING 2011年第2期57卷 542-550页

作者： Lin, Yu-Hsun Wu, Ja-Ling Natl Taiwan Univ Dept Elect Engn Taipei 106 Taiwan

With the advance of 3D display and related technologies, 3D video applications have been booming up recently. The color plus depth-map 3D video gains the attention for its relatively low storage and transmission bandwidth requirements as compared with stereo and multi-view videos. The color plus depth-map 3D video provides the depth information about the recorded content which brings new rooms for video processing and compression. This work reveals the usage of depth information for speeding up video encoding process. A novel fast mode decision algorithm based on depth information is proposed. The algorithm is also applicable to videos in which the associated depth-maps are not the ground-truth. By utilizing the depth information, we can classify scenes according to the associated depth and assign the appropriate modes. We can also deduce the configuration of the given macroblock by the associated depth information and select the suitable mode candidates;therefore, the encoding process will be speeded-up accordingly. Experimental results show that the proposed algorithm is faster than existing mode decision approaches with similar coding efficiency. The entire encoding time is reduced by about 63% for Standard Definition (SD) and High Definition (HD) formats while the Rate-Distortion (RD) performance is almost the same as compared with the exhaustive full mode decision approach.

关键词： Color plus Depth-Map 3D Videos depth information based fast algorithm H.264 mode decision algorithm

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Complexity scalable intra-prediction mode decision algorithm for mobile video applications

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IET COMMUNICATIONS 2014年第9期8卷 1654-1662页

作者： Song, Yun Long, Jizhen Yang, Kun Yang, Gaobo Hunan Univ Sch Informat Sci & Engn Changsha 410082 Hunan Peoples R China Changsha Univ Sci & Technol Sch Comp & Commun Engn Changsha 410004 Hunan Peoples R China Univ Essex Sch Comp Sci & Elect Engn Colchester CO4 3SQ Essex England

The full search scheme employed in H.264/AVC significantly improves the coding performance, but it also introduces a very high computational complexity which limits the applications in resource-constrained mobile devices. In this study, the authors firstly present a discretisation total variation and orientation gradient-based hierarchical intra-prediction mode decision method for mobile video applications. By shrinking the candidate mode set in the rate-distortion optimisation (RDO) process, the proposed algorithm reduces the computational complexity and power consumption of the encoder. Furthermore, they extend the hierarchical algorithm to a complexity scalable version in which the coding complexity is measured on five levels by reserving various numbers of modes for RDO. Experimental results demonstrate that the proposed mode decision algorithm reduces the coding complexity significantly with negligible performance degradation and the proposed complexity scalable algorithm is effective and efficient for mobile video application.

关键词： video coding rate distortion theory optimisation video streaming computational complexity gradient methods full search scheme H.264-AVC coding performance computational complexity resource-constrained mobile devices discretisation total variation candidate mode set rateâ€“distortion optimisation process RDO process power consumption encoder hierarchical algorithm coding complexity mode decision algorithm orientation gradient-based hierarchical intraprediction mode decision method mobile video applications

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Fast mode decision algorithm for H.264/AVC based on all-zero blocks predetermination

Fast mode decision algorithm for H.264/AVC based on all-zero...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Tang, Haoyang Shi, Haoshan NW Polytech Univ Coll Elect Informat Xian 710072 Peoples R China

ISBN: (纸本)9780769535838

The newly proposed video coding standard H.264/AVC by JVT can achieve much higher efficiency than previous standards. Unfortunately this comes at a cost in greatly increased complexity at the encoder mainly due to Motion estimation (ME) and inter /intra prediction block mode decision. In this paper, we propose a fast mode decision algorithm for H.264/AVC based on all-zero blocks predetermination. According to the characteristics of H.264/AVC integral DCT transform and quantization, we present the adaptive detection thresholds and early termination conditions for the inter/intra prediction mode. Then these thresholds are further applied to the fast mode decision algorithm from various encoding modes, which reduce the search complexity of mode decision. The experimental results show that, compared with other mode decision algorithms, our algorithm achieves approximately 21%-41% computational saving without video-quality degradation and bit-rate increase.

关键词： H.264/AVC mode decision algorithm discrete cosine transform (DCT) early dectection

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Fast mode decision algorithm for H.264/AVC based on all-zero blocks predetermination

Fast mode decision algorithm for H.264/AVC based on all-zero...

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2009 International Conference on Measuring Technology and Mechatronics Automation(ICMTMA 2009)(2009年检测技术与机械自动化国际会议)

作者： Haoyang Tang Haoshan Shi The College of Electronic Information Northwest Polytechnical University Xi'an China

The newly proposed video coding standard H.264/AVC by JVT can achieve much higher efficiency than previous standards. Unfortunately this comes at a cost in greatly increased complexity at the encoder mainly due to Motion estimation (ME) and inter/intra prediction block mode decision. In this paper, we propose a fast mode decision algorithm for H.264/AVC based on all-zero blocks predetermination. According to the characteristics of H.264/AVC integral DCT transform and quantization, we present the adaptive detection thresholds and early termination conditions for the inter/intra prediction mode. Then these thresholds are further applied to the fast mode decision algorithm from various encoding modes, which reduce the search complexity of mode decision. The experimental results show that, compared with other mode decision algorithms, our algorithm achieves approximately 21％41％ computational saving without video-quality degradation and bit-rate increase.

关键词： H.264/AVC mode decision algorithm discrete cosine transform (DCT) early dectection

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