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High Efficiency Video Coding standard (HEVC) can achieve higher compression performance than the previous video coding standards. HEVC employs a quad-tree based block partition scheme to handle the potential challenge of compressing the ultra high definition (UHD) videos. The quad-tree based partition segments each input frame into a series of variable-sized blocks, and tries to find the best partition that encodes the frame blocks with the optimal rate-distortion performance. To determine the block size or depth level of partition, a highly computational rate-distortion optimization process is involved to compute the best partition results in terms of minimum rate-distortion cost (RDcost). This paper proposes a novel fast CU partition algorithm based on the feature of rate-distortion variation during HEVC partitioning each block to eliminate the unnecessary partition and RDcost computation. Experimental results show that the proposed algorithm can reduce 17% to 32% execution time of HEVC encoder with negligible loss of performance.
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