Method and apparatus for mode- and size-dependent block-level restriction

摘要

A method of intra-predicting a block of a picture includes, for samples from a plurality of samples of the block, by intra-prediction using an intra-prediction mode selected from one of a DC intra-prediction mode, a planar intra-prediction mode, and an angular intra-prediction mode, determining a predicted sample value from the one or more reference sample values; determining a first weight based on an intra prediction mode and one of a height of a block, a width of a block, or a height and width of a block; determining a second weight based on the intra prediction mode and one of the height of the block, the width of the block, or the height and width of the block; calculating an additional value as a weighted sum of the top reference sample value and the left reference sample value, by weighting the top reference sample value with a first weight and the left reference sample value with a second weight; multiplying the predicted sample values by a sample weight factor to produce a weighted predicted sample value; adding an additional value to the weighted prediction sample value to generate a denormalized corrected prediction sample value; and normalizing the denormalized modified prediction sample value by an arithmetic right shift of the integer representation of the denormalized modified prediction sample value to produce a normalized modified prediction sample value.