US 2025/0063165 A1 · EXTENDED REFERENCE INTRA-PICTURE PREDICTION

Abstract

A video encoder is configured to encode, by block based predictive encoding, pictures of a video into coding data, wherein the block based predictive encoding includes an intra-picture prediction. The video encoder is configured to use, for the intra-picture prediction, for encoding a prediction block of a picture, a plurality of nearest reference samples of the picture directly neighboring the prediction block and a plurality of extended reference samples, each extended reference sample of the plurality of extended reference samples separated from the prediction block at least by one nearest reference sample of the plurality of reference samples. The video encoder is further configured to sequentially determine an availability or unavailability of each of the plurality of nearest reference samples and to substitute a nearest reference sample being determined as unavailable by a substitution sample. The video encoder is configured to use the substitution sample for the intra-picture prediction.

Claims24

Dependent claims

A method for video decoding, comprising:

determining whether a reference sample at a first position within a reference line is available, wherein the reference line is spatially separated from a prediction block;
in response to a determination that the reference sample at the first position is unavailable, sequentially determining whether each reference sample included in the reference line is available, starting with a reference sample positioned adjacent to the reference sample at the first position, until a reference sample at a second position is determined to be available;
setting a value of the reference sample at the first position to a value of the reference sample at the second position;
generating at least one additional reference sample having a value of a reference sample positioned at an end of the reference line;
and
decoding the prediction block using the values of the reference samples of the reference line and the value of the at least one additional reference sample.

3 more elements

A non-transitory computer readable medium containing instructions that when executed cause at least one processor to:

determine whether a reference sample at a first position within a reference line is available, wherein the reference line is spatially separated from a prediction block;
in response to a determination that the reference sample at the first position is unavailable, sequentially determine whether each reference sample included in the reference line is available, starting with a reference sample positioned adjacent to the reference sample at the first position, until a reference sample at a second position is determined to be available;
set a value of the reference sample at the first position to a value of the reference sample at the second position;
generate at least one additional reference sample having a value of a reference sample positioned at an end of the reference line;
and
decode the prediction block using the values of the reference samples of the reference line and the value of the at least one additional reference sample.

3 more elements

Dependencies are inferred from the claim text.

Extended reference intra-picture prediction

Life of this patent

Extended reference intra-picture prediction

Life of this patent

Abstract

Claims24