US 2024/0205458 A1 · TRANSFORM PREDICTION WITH PARSING INDEPENDENT CODING

Abstract

Transform prediction with parsing independent coding includes generating a reconstructed frame and outputting the reconstructed frame. Generating the reconstructed frame includes entropy decoding transform blocks for the reconstructed frame, entropy decoding decoded transform identifiers for the transform blocks, obtaining transform-specific probability distributions for available transforms, and, for a current transform block from the transform blocks, identifying a current remapped transform identifier from the decoded transform identifiers, identifying a current transform identifier in accordance with the current remapped transform identifier, the transform coefficients from the current transform block, and the transform-specific probability distributions, identifying a current transform in accordance with the current transform identifier; inverse transforming, in accordance with the current transform, the current transform block to obtain a current residual block and obtaining a current reconstructed block using the current residual block. Generating the reconstructed frame includes including the current reconstructed block in the reconstructed frame.

Claims20

Dependent claims

A method comprising:

obtaining an encoded bitstream;
generating a reconstructed frame, wherein the reconstructed frame includes a plurality of blocks, wherein generating the reconstructed frame includes:
entropy decoding, from the encoded bitstream, transform blocks for the reconstructed frame;
entropy decoding, from the encoded bitstream, decoded transform identifiers for the transform blocks;
obtaining transform-specific probability distributions for available transforms;
for a current transform block from the transform blocks:
identifying a current remapped transform identifier from the decoded transform identifiers;
identifying a current transform identifier, wherein identifying the current transform identifier includes identifying the current transform identifier in accordance with the current remapped transform identifier, the transform coefficients from the current transform block, and the transform-specific probability distributions;
identifying a current transform in accordance with the current transform identifier;
inverse transforming, in accordance with the current transform, the current transform block to obtain a current residual block;
and
obtaining a current reconstructed block using the current residual block;
and
including the current reconstructed block in the reconstructed frame;
and
outputting the reconstructed frame.

13 more elements

An apparatus comprising:

a non-transitory computer readable medium;
and
a processor configured to execute instructions stored on the non-transitory computer readable medium to:
obtain a current frame from an input video stream;
obtain an encoded frame, wherein, to obtain the encoded frame the processor executes the instructions to encode the current frame, wherein to encode the current frame the processor executes the instructions to:
for a current block from the current frame:
obtain as a residual block, a difference between the current block and a prediction reference block obtained for coding the current block;
determine a transform identifier of a transform, from a plurality of available transforms, for transforming the residual block;
obtain an entropy coded block, wherein, to obtain the entropy coded block, the processor executes the instructions to entropy code a transform block obtained by transformation of the residual block using the transform;
include the entropy coded block in a plurality of entropy coded blocks for the current frame;
obtain a transform-specific probability distribution for the transform;
obtain an entropy coded transform identifier, wherein to obtain the entropy coded transform identifier the processor executes the instructions to entropy code the transform identifier using the transform-specific probability distribution;
and
include the entropy coded transform identifier in a plurality of entropy coded transform identifiers for the current frame;
include the plurality of entropy coded blocks in an output bitstream;
include the plurality of entropy coded transform identifiers in the output bitstream;
and
output the output bitstream.

15 more elements

Dependencies are inferred from the claim text.

Transform prediction with parsing independent coding

Life of this patent

Transform prediction with parsing independent coding

Life of this patent

Abstract

Claims20