Method and device for predictive picture encoding and decoding
AssigneeInterDigital VC Holdings, Inc.
InventorsEdouard FRANCOIS, Christophe CHEVANCE, Franck HIRON
Life of this patent
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Abstract
A method for encoding a block of a picture comprising for at least one sample of the block and for one current component: obtaining a prediction value; determining a mapped residual value from a source value of the sample and from the prediction value responsive to a mapping function; and encoding the mapped residual value into a bitstream; wherein the mapping function is derived to obtain at least one of a reduction of a bit cost of the bitstream for a given quality of reconstruction or an increase of quality of reconstruction for a given bit cost of the bitstream.
Claims12
A method for encoding comprising:
- obtaining a prediction value of a current color component of a sample of a block of a picture;
- determining a mapped residual value from a source value of said current color component and from the prediction value using a mapping function;
- and
- encoding the mapped residual value into a bitstream.
A method for decoding a block of a picture:
- obtaining a prediction value of one current color component of a sample of the block;
- decoding a residual value for the sample;
- mapping the residual value using a mapping function to obtain a mapped residual value;
- and
- determining a reconstructed value for the sample from the mapped residual value and from the prediction value.
A device for encoding comprising electronic circuitry adapted for:
- obtaining a prediction value of a current color component of a sample of a block of a picture;
- determining a mapped residual value from a source value of said current color component and from the prediction value using a mapping function;
- and
- encoding the mapped residual value into a bitstream.
A device for decoding a block of a picture comprising electronic circuitry adapted for:
- obtaining a prediction value of one current color component of a sample of the block;
- decoding a residual value for the sample;
- mapping the residual value using a mapping function to obtain a mapped residual value;
- and
- determining a reconstructed value for the sample from the mapped residual value and from the prediction value.
A non-transitory information storage medium storing program code instructions for implementing a method for encoding comprising:
- obtaining a prediction value of a current color component of a sample of a block of a picture;
- determining a mapped residual value from a source value of said current color component and from the prediction value using a mapping function;
- and
- encoding the mapped residual value into a bitstream.
A non-transitory information storage medium storing program code instructions for implementing a method for decoding a block of a picture comprising:
- obtaining a prediction value of one current color component of a sample of the block;
- decoding a residual value for the sample;
- mapping the residual value using a mapping function to obtain a mapped residual value;
- and
- determining a reconstructed value for the sample from the mapped residual value and from the prediction value.
Dependencies are inferred from the claim text.