Patent ID: 9179151
Filing Date: 2015-11-03
Classification: H04N

Abstract:
1. A method comprising: identifying a plurality of transform coefficients for a current block of a current frame of a video stream, wherein the plurality of transform coefficients is ordered based on a scan order; identifying a current transform coefficient from the plurality of transform coefficients, wherein the plurality of transform coefficients are quantized at more than one bit; identifying a plurality of context coefficients from the plurality of transform coefficients, wherein each context coefficient from the plurality of context coefficients is spatially proximate to the current transform coefficient in a transform coefficient matrix and is available for entropy coding the current transform coefficient; identifying an entropy coding probability for the current transform coefficient based on the scan order and the plurality of context coefficients; entropy coding the current transform coefficient based on the entropy coding probability; including the entropy coded current transform coefficient in an output bitstream; and storing or transmitting the output bitstream.