Inter-plane prediction
A better rate distortion ratio is achieved by making interrelationships between coding parameters of different planes available for exploitation for the aim of redundancy reduction despite the additional overhead resulting from the need to signal the inter-plane prediction information to the decoder. In particular, the decision to use inter plane prediction or not may be performed for a plurality of planes individually. Additionally or alternatively, the decision may be done on a block basis considering one secondary plane.
1 . A decoder for decoding a data stream encoded with a video represented by multiple arrays of information samples, comprising:
an extractor configured for:
extracting, from the data stream, a first set of coding parameters associated with a first coding block of a first plurality of coding blocks of a first array of information samples representing a first color component of the video, wherein the first set of coding parameters is to be used for reconstructing the first coding block,
decoding a syntax element extracted from the data stream to obtain inter-plane interchange information for a subset of a second plurality of coding blocks of a second array of information samples representing a second color component of the video, wherein the inter-plane interchange information signals whether, for a second coding block in the subset, a second set of coding parameters including a second weighting parameter used for reconstructing the second coding block in the subset is to be derived based on the first set of coding parameters including a first weighting parameter, wherein coding parameters in the first and second set of coding parameters include entropy coded subdivision information that specifies how a coding block is to be sub-divided, and
responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is not to be derived based on the first set of coding parameters, extracting, from the data stream, the second set of coding parameters including the second weighting parameter for the second coding block; and
a predictor configured for, responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is to be derived based on the first set of coding parameters, inferring at least one of the second set of coding parameters including the second weighting parameter from at least one of the first set of coding parameters including the first weighting parameter, wherein the second weighting parameter specifies how a prediction signal of the second coding block is determined based on a plurality of reference values and a sampling format of the first array is different than a sampling format of the second array.
2 . The decoder of claim 1 , further comprising:
a reconstructor configured for reconstructing the second coding block based on the second set of coding parameters.
3 . The decoder of claim 1 , wherein:
the extractor is further configured for predicting the second coding block based on the second set of coding parameters to generate a predicted second coding block.
4 . The decoder of claim 3 , further comprising:
a reconstructor configured for reconstructing the second coding block based on the predicted second coding block.
5 . The decoder of claim 4 , wherein:
the extractor is configured for extracting, from the data stream in accordance with the second set of coding parameters, residual information associated with the second coding block; and
the reconstructor is configured for reconstructing the second coding block based on the predicted second coding block and the residual information associated with the second coding block.
6 . The decoder of claim 1 , wherein a spatial resolution of the first array is greater than a spatial resolution of the second array.
7 . An encoder for encoding, into a data stream, a video represented by multiple arrays of information samples, comprising:
a data stream inserter configured for:
inserting, into the data stream, a first set of coding parameters associated with a first coding block of a first plurality of coding blocks of a first array, wherein the first set of coding parameters is to be used for reconstructing the first coding block,
encoding, into the data stream, inter-plane interchange information for a subset of a second plurality of coding blocks of a second array, wherein the inter-plane interchange information signals whether for a second coding block in the subset, a second set of coding parameters including a second weighting parameter used for reconstructing the second coding block in the subset is to be derived based on the first set of coding parameters including a first weighting parameter, wherein coding parameters in the first and second set of coding parameters include entropy coded subdivision information that specifies how a coding block is to be sub-divided, and
responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is not to be derived based on the first set of coding parameters, inserting, into the data stream, the second set of coding parameters for the second coding block including the second weighting parameter; and
a predictor configured for, responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is to be derived based on the first set of coding parameters, inferring at least one of the second set of coding parameters including the second weighting parameter from at least one of the first set of coding parameters including the first weighting parameter,
wherein the second weighting parameter specifies how a prediction signal of the second coding block is determined based on a plurality of reference values, a sampling format of the first array is different than a sampling format of the second array, and the second coding block is reconstructed based on the second set of coding parameters.
8 . The encoder of claim 7 , wherein:
the second coding block is reconstructed based on the second set of coding parameters.
9 . The encoder of claim 7 , wherein:
the predictor is configured further for predicting the second coding block based on the second set of coding parameters to generate a predicted second coding block.
10 . The encoder of claim 9 , wherein:
the second coding block is reconstructed based on the predicted second coding block.
11 . The encoder of claim 10 , wherein:
the data stream inserter is further configured for inserting, into the data stream in accordance with the second set of coding parameters, residual information associated with the second coding block; and
the second coding block is reconstructed based on the predicted second coding block and the residual information associated with the second coding block.
12 . The encoder of claim 7 , wherein:
a spatial resolution of the first array is greater than a spatial resolution of the second array.
13 . A non-transitory computer-readable medium storing a data stream, which is related to a video represented by multiple arrays of information samples, the data stream comprising:
a first set of coding parameters associated with a first coding block of a first plurality of coding blocks of a first array, wherein the first set of coding parameters is to be used for reconstructing the first coding block,
a syntax element representing inter-plane interchange information for a subset of a second plurality of coding blocks of a second array, the inter-plane interchange information signals whether, for a second coding block in the subset, a second set of coding parameters including a second weighting parameter used for reconstructing the second coding block in the subset is to be derived based on the first set of coding parameters including a first weighting parameter, and
the second set of coding parameters including the second weighting parameter associated with a second coding block of the subset when the inter-plane interchange information signals that the second set of coding parameters is not to be derived based on the first set of coding parameters, wherein coding parameters in the first and second set of coding parameters include entropy coded subdivision information that specifies how a coding block is to be sub-divided,
wherein if the inter-plane interchange information signals the second set of coding parameters for that second coding block is to be derived based on the first set of coding parameters, at least one of the second set of coding parameters including the second weighting parameter of the second coding block is inferred from at least one of the first set of coding parameters including the first weighting parameter, wherein the second weighting parameter specifies how a prediction signal of the second coding block is determined based on a plurality of reference values and a sampling format of the first array is different than a sampling format of the second array.
14 . The non-transitory computer-readable medium of claim 13 , wherein the data stream further comprises residual information associated with the second coding block inserted in accordance with the second set of coding parameters.
15 . The non-transitory computer-readable medium of claim 13 , wherein a spatial resolution of the first array is greater than a spatial resolution of the second array.
16 . A method of decoding a data stream encoded with a video represented by multiple arrays of information samples, the method comprising:
extracting, from the data stream, a first set of coding parameters associated with a first coding block of a first plurality of coding blocks of a first array of information samples that represents a first color component of the video, wherein the first set of coding parameters is to be used for reconstructing the first coding block;
decoding a syntax element extracted from the data stream to obtain inter-plane interchange information for a subset of a second plurality of coding blocks of a second array, wherein the inter-plane interchange information signals whether, for a second coding block in the subset, a second set of coding parameters including a second weighting parameter used for reconstructing the second coding block in the subset is to be derived based on the first set of coding parameters including a first weighting parameter, wherein coding parameters in the first and second set of coding parameters include entropy coded subdivision information that specifies how a coding block is to be sub-divided;
responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is not to be derived based on the first set of coding parameters, extracting, from the data stream, the second set of coding parameters including the second weighting parameter for the second coding block; and
responsive to a determination based on the inter-plane interchange information that the second set of coding parameters for the second coding block in the subset is to be derived based on the first set of coding parameters, inferring at least one of the second set of coding parameters including the second weighting parameter from at least one of the first set of coding parameters including the first weighting parameter, wherein the second weighting parameter specifies how a prediction signal of the second coding block is determined based on a plurality of reference values and a sampling format of the first array is different than a sampling format of the second array.
17 . The method of claim 16 , further comprising:
predicting the second coding block based on the second set of coding parameters to generate a predicted second coding block.
18 . The method of claim 17 , further comprising:
reconstructing the second coding block based on the predicted second coding block.
19 . The method of claim 18 , further comprising:
extracting, from the data stream in accordance with the second set of coding parameters, residual information associated with the second coding block; and
reconstructing the second coding block based on the predicted second coding block and the residual information associated with the second coding block.
20 . The method of claim 16 , wherein a spatial resolution of the first array is greater than a spatial resolution of the second array.