Rough mode cost–based fast intra coding for high-efficiency video coding |
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| Affiliation: | 1. Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Department of Computer Science, Guangxi Normal University, Guilin 541004, China;1. Shanghai Jiao Tong University, School of Aeronautics and Astronautics, 800 Dongchuan Road, Shanghai 200240, China;2. Ecole Centrale Lyon, LIRIS, UMR 5205 CNRS, 36 Avenue Guy de Collongue, Ecully 69130, France;3. University of Shanghai For Science and Technology, School of Optical-Electrical and Computer Engineering, 516 Jungong Road, Shanghai 200240, China;1. School of Information Science and Engineering, Shandong Normal University, Jinan 250014, Shandong Province, China;2. Institute of Data Science and Technology, Shandong Normal University, Jinan 250014, Shandong Province, China;1. Department of Medical Informatics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran;2. Department of Electrical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran |
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| Abstract: | The quadtree-based coding unit (CU) and transform unit (TU) structure, as well as various prediction units (PUs) of HEVC, considerably increase encoding complexity in intra coding and inter coding. This paper proposes a rough mode cost (RMC)-based algorithm for accelerating CU/TU depth decisions and PU mode decisions in HEVC intra coding. For CU depth decisions, RMC values are used for the fast determination of CU partition. In the case of PU mode decisions, modes with higher RMCs are removed from the candidate list to reduce the number of test modes. For TU depth decisions, the TU partition of the mode with the least RMC is used to determine the TU partitions of remaining modes. The proposed TU partitioning method demonstrates superior performance to the default method in reference software. The proposed algorithm can reduce encoding time by approximately 51% on average, with a 0.69% increase in the Bjøntegaard-Delta (BD) rate. |
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| Keywords: | High-efficiency video coding (HEVC) Fast intra coding Coding unit (CU) Intra mode decision Rough mode decision Transform unit (TU) |
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