Image encoding / decoding method and device, and recording medium for storing bitstream

Abstract

Provided are an image encoding / decoding method and device, a recording medium for storing a bitstream, and a transmission method. The image decoding method may comprise the steps of: deriving a first intra prediction mode, a second intra prediction mode, and a third intra prediction mode of a current block from among a plurality of candidate intra prediction modes on the basis of a current template including adjacent samples of the current block; deriving a first prediction block, a second prediction block, and a third prediction block of the current block on the basis of the first intra prediction mode, the second intra prediction mode, and the third intra prediction mode, respectively; and deriving a final prediction block of the current block by weighted-summing the first prediction block, the second prediction block, and the third prediction block, wherein the third intra prediction mode is derived as one of a DC mode, a planar mode, and a neural network-based intra prediction (NNIP) mode, and the neural network-based intra prediction mode uses a neural network model executed on the basis of a block vector of the current template.

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