关键词: 时空域信息, 编码单元, 运动矢量, 预测模式

Abstract: Due to the quad-tree with nested multi-type tree coding tree architecture used in versatile video coding（VVC）, encoding process has great computational complexity, and this brings difficulties to practical use. To solve this problem, a fast coding unit（CU） partitioning algorithm based on temporal and spatial information is proposed. The proposed algorithm consists of two parts, in the first part, according to the shape of current CU, three different models are utilized to derive motion vectors from corresponding area in the reference frame, according to distribution of motion vectors in models, the CU partition modes that need to be traversed will be reduced by early selecting process; the second part utilizes the correlation of prediction modes between the current CU and adjacent same size CUs, by comparing their prediction modes and rate distortion cost, determines whether to do further traverse in the next depth, thus partition depths that need to be traversed is reduced. Experimental results show that, comparing with the latest encoder VTM10.0, the proposed method can save 39.28% of encoding time with 1.62%  increase in BDBR and 0.05 dB increase in PSNR in random access mode.

Key words: temporal and spatial information, coding unit, motion vector, prediction mode