Residual quad tree (RQT) coding for video coding

摘要

A video decoding device receives an array of transform coefficients for a chroma component of video data. The video decoding device receives entropy encoded data representing the value of a split flag associated with the chroma component. The value of the split flag indicates whether the array of transform coefficients is divided into smaller transform blocks. The video decoding device determines a context for the entropy encoded data representing the split flag. The context is based on the value of a split flag associated with another component of video data. The video decoding device entropy decodes the data representing the value of the split flag based on the determined context using context adaptive binary arithmetic coding (CABAC). The luma and chroma components have independent residual quadtree (RQT) structures.

主权项

1. A method of decoding video data, the method comprising:
receiving entropy encoded data representing a value of a first split flag associated with an array of transform coefficients for a first chroma component of the video data, wherein the value of the first split flag indicates whether the array of transform coefficients for the first chroma component is divided into smaller transform blocks at a level within a first residual quad tree (RQT) partitioning structure, and wherein the first chroma component is partitioned according to the first RQT partitioning structure; determining that at least one of a luma component or a second chroma component of the video data is included in a previously-decoded component of the video data with respect to the first chroma component being decoded, wherein the previously-decoded component of the video data is partitioned according to a second RQT partitioning structure; determining a context for decoding the entropy encoded data representing the first split flag according to context adaptive binary arithmetic coding (CABAC) at least in part by using a value of a second split flag associated with an array of transform coefficients for the previously-decoded component of the video data, wherein the second split flag is at a corresponding level within the second RQT partitioning structure with respect to the level associated with the first split flag within the first RQT partitioning structure; based on the determination that at least one of the luma component or the second chroma component of the video data has been decoded prior to the first luma component being decoded, entropy decoding the data representing the value of the first split flag according to CABAC using the context determined for the first split flag; and reconstructing the video data based on the value of the first split flag.