Coding the position of a last significant coefficient within a video block based on a scanning order for the block in video coding

摘要

In one example, an apparatus is disclosed for coding coefficients associated with a block of video data during a video coding process, wherein the apparatus includes a video coder configured to code x- and y-coordinates that indicate a position of a last non-zero coefficient within the block according to a scanning order associated with the block when the scanning order comprises a first scanning order, and code interchanged x- and y-coordinates that indicate the position of the last non-zero coefficient within the block according to the scanning order when the scanning order comprises a second scanning order, wherein the second scanning order is different than the first scanning order.

主权项

1. A method of coding a block of coefficients associated with a block of video data during a video coding process, the method comprising:
determining contexts for performing context adaptive entropy coding of the x- and y-coordinates indicating a horizontal position and a vertical position, respectively, of a last non-zero coefficient within the block of coefficients, wherein the contexts indicate a probability of each of the x- and y-coordinates comprising a given value when the coefficients of the block of video data are scanned in a first scanning order; in the case that the coefficients are scanned in the first scanning order, entropy coding the x-coordinate and the y-coordinate using the determined contexts such that the x-coordinate is entropy coded based on the probability of the x-coordinate having a given value and the y-coordinate is entropy coded based on the probability of the y-coordinate having a given value; and in the case that the coefficients are scanned in the second scanning order, interchanging the x- and y-coordinates and entropy coding the interchanged x-coordinate and the interchanged y-coordinate using the determined contexts such that the interchanged x-coordinate is entropy coded based on the probability of the y-coordinate having a given value and the interchanged y-coordinate is entropy coded based on the probability of the x-coordinate having a given value.