High Efficiency Video Coding (HEVC) provides better compression performance by adopting many new techniques. However these tools also increase the computational complexity of the prediction, which consumes most of encoder computations. This paper proposes an effective splitting algorithm in inter prediction of HEVC. Based on the motion homogeneity of coding unit, a certain threshold is used to decide whether the coding unit should be split into smaller ones. So the unnecessary calculation decreases rapidly. By skipping some specific sub-CUs, the coding complexity is dramatically improved. Experimental results show that the proposed technique can save 46.1% coding time in average with negligible loss of coding efficiency, and the decrease of PSNR is only 0.0418 dB.
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