Inheritability-inspired Intra Coding Optimization for AVS3

AVS3 is an emerging video coding standard developed by Audio Video Coding Standard (AVS) Working Group of China. Many new coding tools were introduced into AVS3 and achieved promising coding performance improvement, however, with dramatical encoding time increase. Particularly, the complexity of intra prediction is nine times higher than that of the previous video coding standard, AVS2. In this paper, an inheritability-inspired intra coding optimization method is proposed. The proposed scheme fully explores the intrinsic prediction relationship of different prediction units firstly. Then adaptive early termination scheme of IPF process and elimination of partial intra modes are proposed to accelerate the intra coding. Experimental results show that the proposed method can achieve 30% encoding time saving on average with only 0.43% BD-rate increase in All Intra (AI) configuration compared with AVS3 reference software (HPM5.0).