Intra prediction method and device for predicting and dividing prediction unit into sub-units

Abstract

A method and apparatus for intra prediction include a prediction unit that is divided into sub-units and predicted in the sub-units. A video decoding method includes: determining whether to split a current block into multiple subblocks; when the current block is split into the multiple subblocks, determining a split direction for the current block between a horizontal split direction and a vertical split direction and the number of the subblocks, based on split information decoded from a bitstream and a width and a height of the current block; reconstructing the current block by sequentially reconstructing the subblocks, that are specified according to the split direction and the number of the subblocks, using intra prediction; and setting a grid of N samples at regular intervals in horizontal and vertical directions and performing deblock-filtering on, among boundaries between the subblocks in the current block, boundaries that coincide with a boundary of the grid.

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