Method and device for picture encoding and decoding using illumination compensation
AssigneeInterDigital Madison Patent Holdings, SAS
InventorsPhilippe BORDES, Fabrice LELEANNEC, Tangi POIRIER, Fabrice URBAN
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Abstract
A method for reconstructing a picture block is disclosed, wherein the block is predicted using local illumination compensation. The parameters of local illumination compensation parameters are determined according a selection of reconstructed samples located to the left and above the current block. In the case where some of them are unavailable, they may be replaced by others, using different techniques.
Claims16
A method of decoding a block of samples of a picture of a video, the method comprising:
- determining, for the block of samples, a set of NM valid samples from a set of neighboring top and left reconstructed samples;
- selecting a subset of N valid samples in the set of NM valid samples so that numbers of top and left valid samples in the subset of N samples are balanced based on block dimensions or based on both numbers of top and left valid samples;
- determining local illumination compensation parameters from the subset of N valid samples and corresponding reference samples in a reference block;
- and
- reconstructing the block from a prediction block obtained by applying, on the reference block, local illumination compensation based on the determined local illumination compensation parameters.
A decoding apparatus comprising one or more processors and at least one memory coupled to the one or more processors, wherein the one or more processors are configured to perform:
- determining, for the block of samples, a set of NM valid samples from a set of neighboring top and left reconstructed samples;
- selecting a subset of N valid samples in the set of NM valid samples so that numbers of top and left valid samples in the subset of N samples are balanced based on block dimensions or based on both numbers of top and left valid samples;
- determining local illumination compensation parameters from the subset of N valid samples and corresponding reference samples in a reference block;
- and
- reconstructing the block from a prediction block obtained by applying, on the reference block, local illumination compensation based on the determined local illumination compensation parameters.
A method of encoding a block of samples of a picture of a video, the method comprising:
- determining, for the block of samples, a set of NM valid samples from a set of neighboring top and left reconstructed samples;
- selecting a subset of N valid samples in the set of NM valid samples so that numbers of top and left valid samples in the subset of N samples are balanced based on block dimensions or based on both numbers of top and left valid samples;
- determining local illumination compensation parameters from the subset of N valid samples and corresponding reference samples in a reference block;
- and
- encoding the block from a prediction block obtained by applying, on the reference block, local illumination compensation based on the determined local illumination compensation parameters.
An encoding apparatus comprising one or more processors and at least one memory coupled to the one or more processors, wherein the one or more processors are configured to perform:
- determining, for the block of samples, a set of NM valid samples from a set of neighboring top and left reconstructed samples;
- selecting a subset of N valid samples in the set of NM valid samples so that numbers of top and left valid samples in the subset of N samples are balanced based on block dimensions or based on both numbers of top and left valid samples;
- determining local illumination compensation parameters from the subset of N valid samples and corresponding reference samples in a reference block;
- and
- encoding the block from a prediction block obtained by applying, on the reference block, local illumination compensation based on the determined local illumination compensation parameters.
Dependencies are inferred from the claim text.