Direction for wide-angle intra-prediction

Abstract

To provide a method and a device for a beam control in a system formed by a beam.SOLUTION: A method and a device use a wide-angle intra-prediction in order to enable a larger prediction angle of a rectangular block. The wide-angle intra-prediction enables an intra-prediction direction angle that exceeds 45 degrees and -135 degrees as conventional one. According to an embodiment, when a video block to be coded or decoded is a non-regular square, an additional intra-prediction direction can be made in a direction of a longer block edge, and larger number of reference samples can be used along their edge. The index is used for indicating a prediction direction, and the index is adopted in accordance with the additional intra-prediction in the longer direction, and smaller number of prediction directions are used along a shorter block edge so as to correspond to them. The number of prediction modes to be required to be indexed is held, and an angle of them is allowed to correspond to a shape of a block.SELECTED DRAWING: Figure 2

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