Method of intra predicting a block of a picture

A computer-implemented method of intra predicting a first block and a second block of a picture, the method comprising:

• for a sample of the first block and for a sample of the second block:
• obtaining a predicted sample value from one or more reference sample values by performing intra-prediction using an intra-prediction mode;
• multiplying the predicted sample value by a sample weighting factor to produce a weighted predicted sample value;
• adding an additional value to the weighted predicted sample value to produce a non-normalized predicted sample value;
• and
• normalizing the non-normalized predicted sample value by an arithmetic right shift;
• wherein
• the sample weighting factor is ((2<<p)−wL−wT),
• p is a parameter of the sample weighting factor,
• wL is a horizontal weighting factor, and
• wT is a vertical weighting factor,
• wherein the intra-prediction mode used for obtaining the predicted sample value for the first block is a DC intra-prediction mode, and the intra-prediction mode used for obtaining the predicted sample value for the second block is a PLANAR intra-prediction mode.

A device for intra predicting a block of a picture, the device comprising:

• one or more processors:
• a non-transitory computer-readable storage medium coupled to the one or more processors to store instructions, which when executed by the one or more processors, cause the one or more processors to:
• for a sample of the block:
• obtain a predicted sample value from one or more reference sample values by performing intra-prediction using a DC intra-prediction mode;
• multiply the predicted sample value by a sample weighting factor to produce a weighted predicted sample value;
• add an additional value to the weighted predicted sample value to produce a non-normalized predicted sample vale;
• and
• normalize the non-normalized predicted sample value by an arithmetic right shift;
• wherein the sample weighting factor is ((2<<p)−wL−wT),
• wherein
• p is a parameter of the sample weighting factor,
• wL is a horizontal weighting factor, and
• wT is a vertical weighing factor.