Patent ID: 11936884
Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. In a computer system that implements a video decoder, a method comprising:
receiving compressed data as part of a bitstream; and
decoding the compressed data to reconstruct video content, including, for a given coding unit (“CU”) of the video content:
determining a value of a coded block flag (“CBF”) for a root transform unit (“TU”) of a residual quadtree for the given CU, the value of the CBF for the root TU indicating the root TU includes residual information, wherein the compressed data includes the value of the CBF for the root TU, the value of the CBF for the root TU being signaled for the given CU;
determining, based on the value of the CBF for the root TU, that the root TU includes residual information;
determining whether the root TU is split into multiple nodes, each of the multiple nodes being associated with a block, including determining that a predetermined condition is satisfied, the predetermined condition relating to a predetermined maximum TU size, wherein the determining that the predetermined condition is satisfied includes determining that log2(a TU size)<log2(the predetermined maximum TU size);
determining values of multiple preceding CBFs for multiple blocks, the values of the multiple preceding CBFs indicating the multiple blocks, respectively, do not include residual information; and
based at least in part on the values of the multiple preceding CBFs indicating the multiple blocks, respectively, do not include residual information, determining a value of a CBF for a given block, the value of the CBF for the given block indicating that the given block includes residual information, wherein the compressed data does not include the value of the CBF for the given block.