Image encoding method, encoding device, decoding method, and decoding device using intra prediction

Abstract

Provided are an image decoding method, an image decoding device, an image encoding method, and an image encoding device, the image decoding method comprising the steps of: acquiring, from a bitstream, information indicating an intra prediction mode; determining the intra prediction mode of the current block on the basis of the acquired information; determining, on the basis of an index value of the intra prediction mode, a first intra prediction mode and a second intra prediction mode; acquiring a first prediction block by using the first intra prediction mode and a plurality of reference samples included in the image of the current block; acquiring a second prediction block by using the second intra prediction mode and the plurality of reference samples; acquiring a prediction block for the current block by using the first prediction block and the second prediction block; and acquiring a reconstructed block by using the prediction block.

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