Methods and apparatuses of constrained multi-type-tree block partition for video coding

摘要

A video coding system receives input data of a current block split from a parent block, and determines if the parent block is split by horizontal triple tree (TT) partitioning or vertical TT partitioning. A partition type selecting from TT partitioning and binary tree (BT) partitioning and a partition direction selecting from horizontal partitioning and vertical partitioning for splitting the current block are determined by prohibiting a horizontal partitioning type if the parent block is split by horizontal TT partitioning, and prohibiting a vertical partitioning type if the parent block is split by vertical TT partitioning, where the horizontal partitioning type and the vertical partitioning type depend on whether the current block is a middle sub-block in the parent block. The video coding system processes the current block according to the partition type and the partition direction.