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 a prediction type for a block of video data in a slice, wherein the slice is one of an intra (I), predictive (P), or bi-predictive (B) slice; representing the prediction type as a slice prediction type syntax element; binarizing the slice prediction type syntax element using a first binarization mapping when the slice is a P or B slice and a second, different, binarization mapping when the slice is an I slice; context adaptive binary arithmetic encoding (CABAC) the binarized slice prediction type syntax element; wherein the prediction type syntax element specifies a prediction mode and a partition type; and encoding the block of video data in the slice.