Contextual derivation for context adaptive, multilevel significance coding

摘要

A device for coding video data includes a video coder configured to code first significance information for transform coefficients associated with residual data, wherein the first significance information indicates if a first sub-block comprises at least one non-zero coefficient, wherein the first sub-block is a sub-block of an entire transform block; and, code second significance information, wherein the second significance information indicates if a second sub-block comprises at least one non-zero coefficient, wherein the second sub-block is a sub-block of the first sub-block, wherein coding the second significance information comprises performing an arithmetic coding operation on the second significance information, wherein a context for the arithmetic coding operation is determined based on one or more neighboring sub-blocks of a same size as the first sub-block.