In the High Efficiency Video Coding (HEVC), block sizes for hybrid-prediction and residual encoding are recursively selected by using a quadtree structure. This technique requires enormous computational complexity. Nevertheless, the exhaustive quadtree-based partition is not always necessary. This paper fully utilizes all-zero residual blocks to accelerate HEVC encoding process. A near-sufficient condition is derived to detect variable-sized all-zero blocks. For these blocks, DCT and quantization can be skipped. Moreover, a novel PU pruning technique based on allzero block is presented to constrain prediction units (PU) which have little contribution to RD performance. Experiments on a wide range of videos show that proposed scheme can reduce up to 73.42% and an average of 53.37% computational complexity for HEVC encoder with only trivial loss in PSNR and rate.
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