Coded block flag inference in video coding

摘要

A video decoder determines whether a first condition is satisfied. The first condition is satisfied when any sibling residual quad tree (RQT) node of a current RQT node is associated with a significant luma coefficient block. In addition, the video decoder determines whether a second condition is satisfied. The second condition is satisfied when a chroma transform block of a parent RQT node of the current RQT node is significant and is split along with a luma transform block of the parent RQT node. In response to determining that neither the first nor the second condition is satisfied, the video decoder determines that a luma coded block flag (CBF) for the current RQT node is omitted from the bitstream.

主权项

1. A method of decoding video data, the method comprising:
determining whether a first condition is satisfied, wherein the first condition is satisfied when any sibling residual quad tree (RQT) node of a current RQT node of a RQT of a coding unit (CU) is associated with a significant luma coefficient block; determining whether a second condition is satisfied, wherein the second condition is satisfied when a chroma transform block of a parent RQT node of the current RQT node is significant and the chroma transform block of the parent RQT node is split with a luma transform block of the parent RQT node; when neither the first nor the second condition is satisfied, determining that a luma coded block flag (CBF) is omitted from a bitstream; when the luma CBF is omitted from the bitstream or when the luma CBF indicates that syntax elements of a luma coefficient block are signaled in the bitstream, extracting the syntax elements of the luma coefficient block from the bitstream; and reconstructing a sample block of the CU based at least in part on the luma coefficient block.