IMAGE SIGNAL INTRA-PREDICTION AND DECODING METHOD AND DEVICE

摘要

The embodiments of the present invention provide an intra-decoding method for a signal component sampling point of an image block. The method comprises: obtaining, from a video code stream, prediction mode information of a first signal component of a current block; according to the prediction mode information of the first signal component of the current block, determining a prediction mode of the first signal component of the current block from a set of prediction modes of the first signal component of the current block, the set of the prediction modes of the first signal component of the current block comprising an LMA mode and/or an LML mode; according to the prediction mode of the first signal component of the current block, obtaining a predicted value of a first signal component sampling point of the current block; and according to the predicted value of the first signal component sampling point of the current block, obtaining a re-established value of the first signal component sampling point of the current block.