QUALCOMM Incorporated
Context derivation and entropy coding initialization parameters for coordinates of last position coding in video coding

Abstract:

An example device for coding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine a size of a dimension of a current block of the video data; calculate a context for entropy coding a last significant coefficient coordinate along the dimension, wherein to calculate the context, the one or more processors are configured to: calculate a context shift value according to ((log 2TrafoSize+1)>>2)<<1, wherein log 2TrafoSize represents a logarithmic value of the size of the dimension, `>>` represents a bitwise right shift operator, and `<<` represents a bitwise left shift operator; and calculate the context using the context shift value; and entropy code the last significant coefficient coordinate using the calculated context.