| CPC H04N 19/103 (2014.11) [H04N 19/107 (2014.11); H04N 19/109 (2014.11); H04N 19/11 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] | 16 Claims |
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1. A video decoding apparatus for decoding a video from a data stream using block-based predictive coding, the apparatus comprising:
a processor; and
a memory storing instructions that, when executed by the processor, cause the processor to:
derive a collection of one or more primitive predictions for a block using a set of primitive prediction modes adapted for predicting blocks of a picture of the video, wherein each primitive prediction in the collection of primitive predictions is derived using a respective primitive prediction mode from the set of primitive prediction modes;
compose a composite prediction signal for the block by combining primitive predictions from the collection of one or more primitive predictions; and
predict the block using the composite prediction signal, wherein the memory stores instructions that, when executed by the processor, cause the processor to compose the composite prediction signal using a recurrence calculation:
q1=p1
qn+1=ƒn(qn,pνn+1, . . . ,Vn+1), for n=1 . . . K,
wherein:
q=qk+1 is the composite prediction signal;
p1, . . . pνk+1 is the collection of one or more primitive predictions derived using the set of primitive prediction modes;
ν1=1 and νn+1=νn+mn, mn is the number of primitive predictions that ƒn depends on, m1+ . . . +mk=νk+1−1 and νk+1 is the cardinality of the collection of one or more primitive predictions; and
ƒn is a function that maps an intermediate composite prediction signal qn and one or more primitive prediction signals pνn+1, . . . , pνn+1 to a new intermediate prediction signal qn+1.
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