Spatial proximity context entropy coding

摘要

Encoding and decoding using spatial proximity context entropy coding may include identifying a plurality of transform coefficients for a current block of a current frame of a video stream. The plurality of transform coefficients may be ordered based on a scan order. A current transform coefficient may be identified from the plurality of transform coefficients. A plurality of context coefficients may be identified from the plurality of transform coefficients. Each context coefficient may be spatially proximate to the current transform coefficient and may be available for entropy coding the current transform coefficient. An entropy coding probability for the current transform coefficient may be identified based on the scan order and the plurality of context coefficients. The current transform coefficient may be entropy coded based on the entropy coding probability. The entropy coded current transform coefficient may be included in an output bitstream, which may be stored or transmitted.

主权项

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.