Context adaptive entropy coding for non-square blocks in video coding

摘要

Disclosed are techniques for coding coefficients of a video block having a non-square shape defined by a width and a height, comprising coding one or more of x- and y-coordinates that indicate a position of a last non-zero coefficient within the block according to an associated scanning order, including coding each coordinate by determining one or more contexts used to code the coordinate based on one of the width and the height that corresponds to the coordinate, and coding the coordinate by performing a context adaptive entropy coding process based on the contexts. Also disclosed are techniques for coding information that identifies positions of non-zero coefficients within the block, including determining one or more contexts used to code the information based on one or more of the width and the height, and coding the information by performing a context adaptive entropy coding process based on the contexts.

主权项

1. A method of coding transform coefficients associated with a first block of video data during a video coding process, wherein the first block has a non-square shape defined by a width and a height, and wherein one of the width or height of the block equals “1” block position, the method comprising:
coding, with a video coder, one or more of x- or y-coordinates that indicate a position of a last non-zero coefficient within the first block according to a scanning order associated with the block determining, with the video coder, that the one of the width or the height comprises a single block position; determining, with the video coder, one or more contexts used to code a respective x- or y-coordinate based at least in part on one of the width or the height of the block not having the single block position that corresponds to the respective x- or y-coordinate; coding the respective x- or y-coordinate by performing a context adaptive entropy coding process based at least in part on the determined one or more contexts; and not coding, with the video coder, the respective x- or y-coordinate corresponding to the width or height of the block having the single block position.