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1. (WO2018045332) METHODS AND APPARATUS FOR CODED BLOCK FLAG CODING IN QUAD-TREE PLUS BINARY-TREE BLOCK PARTITIONING

Pub. No.:    WO/2018/045332    International Application No.:    PCT/US2017/049937
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Sep 02 01:59:59 CEST 2017
IPC: H04N 19/70
H04N 19/96
Applicants: VID SCALE, INC.
Inventors: XIU, Xiaoyu
HE, Yuwen
Title: METHODS AND APPARATUS FOR CODED BLOCK FLAG CODING IN QUAD-TREE PLUS BINARY-TREE BLOCK PARTITIONING
Abstract:
Systems and methods are proposed herein for coded block flag (CBF) signaling. In some embodiments, a hierarchical signaling method is used to signal the CBFs of chroma components for the quad-tree plus binary tree (QTBT) structure. A CBF flag may be signaled at each QTBT node level for each chroma component, indicating whether any descendent QTBT leaf node under the current level is associated with a non-zero coefficient. In some embodiments, for inter-coded pictures, a flag at the QTBT root node may indicate whether there are non-zero transform coefficients in the descendent leaf nodes that originate from the current root node. When the flag is equal to 1, the coefficients of the descendent leaf nodes under the current node may be signaled; otherwise, no further residual information is transmitted and all the transform coefficients are inferred to be 0.