A Novel Partition Mode for Screen Content Video in AVS3 With the development of applications such as wireless displays and remote desktop, screen content coding (SCC) has been a topic of increasing interest. The stateoftheart partition modes in AVS3 restrict a parent coding unit (CU) to partition into no more than four subCUs in each partition process. To obtain more than four smaller subCUs, a parent CU needs to partition recursively. In this paper, to simplify the recursive partition processes and improve SCC efficiency, a novel partition mode which allows a parent CU to be partitioned into several predefined smaller subCUs with the same shape and size directly is proposed. We make some preexperiments to verify the validity of the proposed partition mode, and limit the application scope to four rectangular CU sizes based on the preexperimental results. As demonstrated in the experimental results, the proposed partition mode can obviously improve SCC efficiency.

Derived Tree Block Partition for AVS3 Intra Coding AVS3 is the next generation video coding standard and is being developed by the audio and video standard (AVS) working group of China. As the successor of AVS2, AVS3 is designed to achieve a great coding efficiency beyond AVS2 as well as H.265HEVC. In this paper, we propose a novel block partition method for intra coding, named derived tree block partition (DTBP), based on the block partition structure in AVS3. By further splitting a leaf node of the partition tree to quad split types or asymmetric types, the signaling efficiency and the flexibility of partitioning asymmetric texture can be improved. When implemented on HPM3.1, up to 1.14% and an average 0.61% BDrates are achieved under AllIntra configuration.