Abstract
High Efficiency Video Coding (HEVC) or H.265 is currently the latest standard in video coding. While this new standard promises improved performance over the previous H.264/AVC standard, the complexity has drastically increased due to the various new improved tools added. The splitting of the 64x64 Largest Coding Unit (LCU) into smaller CU sizes forming a quad tree structure involves a significant number of operations and comparisons which imposes a high computational burden on the encoder. In addition, the improved Motion Estimation (ME) techniques used in HEVC inter prediction in order to ensure greater compression also contribute to the high encoding time. In this paper, a set of standard thresholds are identified based on the Mean Square (MS) of the residuals. These thresholds are used to terminate the CU splitting process and to skip some of the inter modes processing. In addition, CUs with large MS values are split at a very early stage. Experimental results show that the proposed method can effectively reduce the encoding time by 62.2% (70.8% for ME) on average, compared to HM 10, yielding a BD-Rate of only 1.14%.
Highlights
High Efficiency Video Coding (HEVC), produced by the Joint Collaborative Team on Video Coding (JCT-VC) consisting of ISO-IEC/MPEG and ITU-T/VCEG, is currently the latest standard in video image compression [32]
H.264/AVC [35], which partitions the frame into 16 × 16 macroblocks, HEVC makes use of a block of size 64×64 pixels which is known as the Largest Coding Unit (LCU)
In addition to the early termination of CUs and Prediction Units (PUs) modes, CUs with high Mean Square (MS) values at the level of the 2N × 2N mode processing are identified as split CUs
Summary
High Efficiency Video Coding (HEVC), produced by the Joint Collaborative Team on Video Coding (JCT-VC) consisting of ISO-IEC/MPEG and ITU-T/VCEG, is currently the latest standard in video image compression [32] It makes use of the same hybrid approach, consisting of the intra/inter prediction coupled with 2-D transform coding, which all video compression technology have been using since H.261. The larger the CU size, the higher will be the compression as the prediction information sent will be less than those required by the four children This process applies to both the intra and the inter prediction, the PU partitioning is different for these two modes. The complex quad-tree structure of the HEVC standard, which is the basis of the high encoding time, implies that various optimization techniques could be implemented.
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