Edge Direction-Based Fast Coding Unit Partition for HEVC Screen Content Coding

摘要

High efficiency Video Coding is a new video coding standard that presents numerous advantages over previous video coding standards. However, Rate distortion optimization (RDO) complexity is extremely high for screen content coding, which cannot adjust to the real-time performance. This paper proposed a fast and efficient algorithm based on edge direction to partition coding units (CUs) based on their relationship with edge direction. Sobel operator is used to determine the edge direction from the total image before intra prediction. The key point of this algorithm is to determine the relationship between the edge direction and CUs. Experimental results show that the proposed edge direction-based CU partition algorithm provides a decrease in the screen content coding processing time up to 39%, with a little increase in bit-rate(0.7% on average) and a negligible reduction in the PSNR value.