基于相邻CU和率失真代价的HEVC帧内预测快速算法

In this paper, we propose a fast intra prediction algorithm of HEVC based on the adjacent coding unit and rate-distortion cost to the problem of high computational complexity of intra prediction algorithm in HEVC. Before intra prediction, we introduce the depth relevance of the adjacent coding unit to preliminary judging the depth of the current coding unit. When coding the current coding unit, we skip some coding unit sizes that do not fit this region after contrast between their rate-distortion costs and the threshold. The experimental results show that the average encoding time of the proposed fast algorithm decreases by 27.04% and 21.72% respectively in Low Complexity and High Efficiency test conditions. However the average coding bit rate increases only by about 0.33% and 0.16% and the average brightness peak signal-to-noise ratio reduces 0.028dB and 0.021dB respectively. In addition, it can prove the validity of the proposed fast algorithm that the proposed fast algorithm almost has the same RD curves and reconstructed images comparing with HM9.0.