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|1. (WO2018219925) METHOD AND APPARATUS FOR SIGNALLING BI-DIRECTIONAL INTRA PREDICTION IN VIDEO ENCODING AND DECODING|
|Applicants:||INTERDIGITAL VC HOLDINGS, INC.
|Title:||METHOD AND APPARATUS FOR SIGNALLING BI-DIRECTIONAL INTRA PREDICTION IN VIDEO ENCODING AND DECODING|
Different implementations are described for signaling whether or not to use bi-directional intra prediction. In a first embodiment, a syntax element is transmitted for each intra prediction block to explicitly signal whether bi-directional prediction is used. In a second embodiment, an implicit criterion may be calculated at both the encoder and decoder sides based on samples on the reference arrays. Based on the implicit criterion, the encoder and decoder can derive in the same manner whether bi-directional prediction is used, and thus, explicit signaling is not needed at the block level. In a third embodiment, whether to use bi-directional prediction (i.e., bi-directional flag) is determined based on coding performance, and a predictor for the bit- directional flag is determined based on the implicit criterion or causal neighbors, then the difference between the bi-directional flag and its predictor is transmitted to indicate whether bi-directional prediction is used.