Separately coding the position of a last significant coefficient of a video 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 information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to coding information that identifies positions of other non-zero coefficients within the block, including at least one of the following: coding a one-dimensional position within the block that identifies the position of the last non-zero coefficient; coding a two-dimensional position within the block that identifies the position of the last non-zero coefficient, and coding a flag that indicates whether the last non-zero coefficient is located within a range of positions within the block, and coding the one-dimensional position when the last non-zero coefficient is located within the range, and otherwise coding the two-dimensional position.

主权项

1. A method of encoding coefficients associated with a block of video data during a video encoding process, the method comprising:
encoding information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to encoding information that identifies positions of other non-zero coefficients within the block, wherein encoding the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises encoding a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein encoding the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises:
determining a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarizing the horizontal coordinate, such that the horizontal coordinate comprises a first sequence of one or more bins;determining a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarizing the vertical coordinate, such that the vertical coordinate comprises a second sequence of one or more bins; andencoding the first sequence of one or more bins and encoding the second sequence of one or more bins by performing a context adaptive binary encoding process.