US 2022/0191474 A1 · WIDE ANGLE INTRA PREDICTION WITH SUB-PARTITIONS

Abstract

A method and apparatus for performing prediction for encoding or decoding uses intra prediction with sub-partitions. The sub-partitions are oriented either horizontally or vertically and can use wide-angle modes different than that of the video block they originate from. Reference samples for a sub-partition are those of the video block when reference samples for the sub-partition are not available, such as due to direction. In an embodiment, when a sub-partition is square, conventional intra prediction directions are used. Reference samples can be used from a block above and right of the video block or left and below the video block using a mapping along a prediction direction, vertically, or horizontally.

Claims21

Dependent claims

A method, comprising:

determining an intra prediction direction for a rectangular sub-partition of a video block based on dimensions of the sub-partition when a ratio of dimensions of said sub-partition is within a particular range, and based on dimensions of the video block when a ratio of dimensions of said sub-partition is out of said particular range;
mapping reference samples from above right or below left of the video block as above right or below left reference samples for prediction of said sub-partition of the video block;
predicting a sample of the rectangular sub-partition using reference samples from a row above the video block or reference samples from a column left of the video block, wherein a number of reference samples in a row above the video block or a column left of the video block are determined based on dimensions of the rectangular sub-partition;
and,
encoding the rectangular sub-partition of a video block using said prediction in an intra coding mode.

2 more elements

Dependencies are inferred from the claim text.

Wide angle intra prediction with sub-partitions

Life of this patent

Wide angle intra prediction with sub-partitions

Life of this patent

Abstract

Claims21