Abstract
In order to achieve greater coding efficiency compared with the previous video coding standards, various advanced coding techniques are used in the High Efficiency Video Coding (HEVC) standard, such as a flexible partition and a large number of intra prediction modes. However, these techniques lead to much greater complexity that restricts HEVC from realtime applications. To solve this problem, a fast intra mode decision algorithm is proposed in this paper that uses the block’s textural properties to determine the partition depth range and decide whether to split or skip smaller sizes of the coding unit. Besides that, the number of candidate modes for the rough mode decision process is also reduced depending on the block’s property. Experimental results for the recommended test sequences by the JCT-VC show that the proposed algorithm can save an average of 44% encoder time with a slight loss in performance compared to the reference software HM-16.20.
Highlights
The rapid development of social networks and the exchange of multimedia content sets many new requirements for transmission and storage systems
Based on the analysis of existing works, this paper proposes a fast algorithm for intra-frame coding in High Efficiency Video Coding (HEVC), which allows making an early decision on coding tree unit (CTU) splitting and adaptively choosing candidates for the prediction process
If the optimal coding units (CU) size or partition depth range can be decided at the early stage, the wasteful search process of intra mode will be skipped, and a considerable amount of complexity can be significantly reduced in HEVC
Summary
The rapid development of social networks and the exchange of multimedia content sets many new requirements for transmission and storage systems. The international video coding standard H.265/HEVC (High Efficiency Video Coding) developed in 2013 [2] can reduce bitrate by 50% while ensuring equivalent quality compared to its predecessor H.264 [3]. This effectiveness is obtained through adaptive coding techniques, such as flexible partition structures, advanced and adaptive predictions, improved deblocking filter, and entropy coding. This paper focuses on improving the intra-frame coding - one important process in HEVC by early deciding to split the block and select the best suitable candidate modes.
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