MOVING PICTURE DECODING METHOD, MOVING PICTURE CODING METHOD, MOVING PICTURE DECODING APPARATUS, MOVING PICTURE CODING APPARATUS, AND MOVING PICTURE CODING AND DECODING APPARATUS

摘要

A motion-video decoding method of the present invention comprises: an intra-prediction step (S403) for calculating a prediction sample value of a subject block, by implementing intra-prediction to the subject block; a rebuilding sample calculating step (S404) for calculating a rebuilding sample of the subject block, by adding residual data of the subject block and the prediction sample value. In the intra-prediction step, validity of each of a plurality of reference samples located either right above or right to the left of the subject block are evaluated, and when both a valid reference sample and an invalid reference sample are included in the plurality of reference samples, the intra-prediction is implemented using the valid reference sample, and reference samples that had the intra-prediction implemented thereupon are evaluated as valid reference samples, and reference samples that had inter-prediction implemented thereupon are evaluated as invalid reference samples.