Systems and methods for blending inter-intra predictions
The various implementations described herein include methods and systems for encoding and decoding video. In one aspect, a method of video decoding includes receiving video data that includes a first block that is partitioned into a first section and a second section, from a video bitstream. The method further includes identifying a prediction mode for the first block from a syntax element of the video bitstream. In accordance with the prediction mode being a partition-based inter-intra prediction mode wherein the first section is associated with an inter prediction mode and the second section is associated with an intra prediction mode, the first section is blended using a first blending mask and the second section is blended using a second blending mask, the second blending mask being different than the first blending mask. The method also includes decoding the first block using the blended first and second sections.
1 . A method of video decoding performed at a computing system having memory and one or more processors, the method comprising:
receiving video data comprising a plurality of blocks, including a first block that is partitioned into a first section and a second section, from a video bitstream;
identifying a prediction mode for the first block from a syntax element of the video bitstream;
when the prediction mode is a partition-based inter-intra prediction mode, wherein the first section is associated with an inter prediction mode and the second section is associated with an intra prediction mode, blending the first section of the first block using a first blending mask and the second section of the first block using a second blending mask, the second blending mask being different than the first blending mask;
when the prediction mode is a partition-based intra-intra prediction mode, blending the first section of the first block and the second section of the first block using a fourth blending mask, different than the first blending mask and the second blending mask: and decoding the first block using the blended first and second sections.
2 . The method of claim 1 , wherein a width of a first blending area for the first section is different than a width of a second blending area for the second section.
3 . The method of claim 1 , wherein the first blending mask and the second blending mask use a same blending function.
4 . The method of claim 1 , wherein a width of a blending area for the second section is determined based on an intra mode for the first block.
5 . The method of claim 1 , further comprising, when the prediction mode is a partition-based inter-inter prediction mode, blending the first section of the first block and the second section of the first block using a third blending mask.
6 . The method of claim 5 , wherein the first blending mask and the third blending mask have a same blending function.
7 . The method of claim 1 , wherein a width of a blending area of the second blending mask is based on whether an inter prediction part of the partition-based inter-intra prediction mode is a single prediction or a compound prediction.
8 . A method of video encoding performed at a computing system having memory and one or more processors, the method comprising:
receiving video data comprising a plurality of blocks, including a first block;
partitioning the first block into a first section and a second section;
identifying a prediction mode for encoding the first block;
when the prediction mode is a partition-based inter-intra prediction mode, blending the first section of the first block using a first blending mask and the second section of the first block using a second blending mask, the second blending mask being different than the first blending mask;
when the prediction mode is a partition-based intra-intra prediction mode, blending the first section of the first block and the second section of the first block using a fourth blending mask, different than the first blending mask and the second blending mask; and
encoding the first block using the blended first and second sections.
9 . The method of claim 8 , wherein a width of a first blending area for the first section is different than a width of a second blending area for the second section.
10 . The method of claim 8 , wherein the first blending mask and the second blending mask use a same blending function.
11 . The method of claim 8 , wherein a width of a blending area for the second section is determined based on an intra mode for the first block.
12 . The method of claim 8 , further comprising, when the prediction mode is a partition-based inter-inter prediction mode, blending the first section of the first block and the second section of the first block using a third blending mask.
13 . The method of claim 12 , wherein the first blending mask and the third blending mask have a same blending function.
14 . The method of claim 8 , wherein a width of a blending area of the second blending mask is based on whether an inter prediction part of the partition-based inter-intra prediction mode is a single prediction or a compound prediction.
15 . A method of processing visual media data, the method comprising:
obtaining a source video sequence that comprises a plurality of frames; and
performing a conversion between the source video sequence and a video bitstream of visual media data according to a format rule,
wherein the video bitstream comprises a syntax element and a plurality of encoded blocks including a first block; and
wherein the format rule specifies that:
a prediction mode for the first block is to be identified from the syntax element;
when the prediction mode is a partition-based inter-intra prediction mode, the first section of the first block is to be blended using a first blending mask and the second section of the first block is to be blended using a second blending mask, the second blending mask being different than the first blending mask;
when the prediction mode is a partition-based intra-intra prediction mode, the first section of the first block and the second section of the first block are to be blended using a fourth blending mask, different than the first blending mask and the second blending mask; and
the first block is to be decoded using the blended first and second sections.
16 . The method of claim 15 , wherein a width of a first blending area for the first section is different than a width of a second blending area for the second section.
17 . The method of claim 15 , wherein the first blending mask and the second blending mask use a same blending function.
18 . The method of claim 15 , wherein a width of a blending area for the second section is determined based on an intra mode for the first block.
19 . The method of claim 15 , wherein the format rule further specifies that, when the prediction mode is a partition-based inter-inter prediction mode, the first section of the first block and the second section of the first block are to be blended using a third blending mask.
20 . The method of claim 19 , wherein the first blending mask and the third blending mask have a same blending function.