Context reduction for context adaptive binary arithmetic coding

摘要

A reduction in the number of binarizations and/or contexts used in context adaptive binary arithmetic coding (CABAC) for video coding is proposed. In particular, this disclosure proposes techniques that may lower the number contexts used in CABAC by up to 56.

主权项

1. A method of encoding video data comprising:
determining an asymmetric partition for a prediction mode for a block of video data; encoding a partition type bin of a syntax element using context adaptive binary arithmetic coding (CABAC) with a single context, the syntax element indicating how the block of video data is partitioned, wherein the syntax element comprises a binary string, wherein the partition type bin indicates whether the block of video data is symmetrically partitioned or asymmetrically partitioned, wherein the partition type bin is the second to last bin of the binary string, wherein the single context is the same for any asymmetric partition, and wherein the single context is a probability model; and encoding a partition size bin of the syntax element using CABAC in bypass mode.