VIDEO ENCODING METHOD AND APPARATUS THEREFOR, AND VIDEO DECODING METHOD AND APPARATUS THEREFOR

摘要

Disclosed is a video decoding method for acquiring a residue of a first bit depth on a current block by decoding a bit stream, generating a prediction block of the current block by using a block, which was previously decoded using the first bit depth and stored in a buffer, when performing an intra-prediction of the current block, and generating a restoration block of the first bit depth by using the prediction block and the residue of the first bit depth. When an inter-prediction for the current block is performed in the disclosed video decoding method, a prediction block of a second bit depth is generated by using an image previously decoded by using a second bit depth, and the generated prediction block of the second bit depth is changed into the first bit depth such that the prediction block of the current block can be generated. At this time, the first bit depth is greater than the second bit depth.