Intra prediction-based video signal processing method and device

Patent metadata

Field	Value
Publication number	US-12418645-B2
Application number	US-202418630933-A
Country	US
Kind code	B2
Filing date	Apr 9, 2024
Priority date	Feb 28, 2019
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

Disclosed are a video signal processing method and device whereby a video signal is encoded or decoded. The video signal processing method may comprise the steps of: determining whether an intra sub-partition (ISP) mode is applicable to a current block; if the ISP mode is applicable to the current block, splitting the current block into a plurality of rectangular transform blocks in the horizontal or vertical direction; generating prediction blocks of the transform blocks by carrying out intra prediction on each of the transform blocks; and reconstructing the current block on the basis of residual blocks of the transform blocks, and the prediction blocks.

First claim

The invention claimed is:

1. A device for decoding a video signal, the device comprising a processor,
wherein the processor is configured to:
when an intra sub-partition (ISP) mode is applied to a current block, obtain a plurality of transform blocks by dividing the current block based on a horizontal direction or a vertical direction,
wherein the plurality of transform blocks include a first transform block and a second transform block,
generate a first prediction block of the first transform block and a second prediction block of the second transform block, and
reconstruct the current block based on a first residual block, a second residual block, the first prediction block, and the second prediction block,
wherein the first residual block and the second residual block are obtained by performing a low frequency non-separable transform on each of the first transform block and the second transform block,
wherein the first prediction block and the second prediction block are generated by applying position-dependent intra prediction sample filtering.

2. The device of claim 1 ,
wherein whether the position-dependent intra prediction sample filtering is applied based on at least one of a width and a height of each of the transform blocks.

3. The device of claim 2 ,
wherein the width of each of the transform blocks is equal to or larger than a pre-configured reference value, and the height of each of the transform blocks is equal to or larger than the pre-configured reference value.

4. The device of claim 1 ,
wherein the position-dependent intra prediction sample filtering is applied by weighted combination of reference samples of each of the transform blocks.

5. The device of claim 1 ,
wherein a transform kernel for the low frequency non-separable transform is determined based on an intra prediction mode of the current block.

6. A device for encoding a video signal, the device comprising a processor,
wherein the processor is configured to
obtain a bitstream to be decoded by a decoder using a decoding method,
wherein the decoding method comprises:
when an intra sub-partition (ISP) mode is applied to a current block, obtaining a plurality of transform blocks by dividing the current block based on a horizontal direction or a vertical direction,
wherein the plurality of transform blocks include a first transform block and a second transform block;
generating a first prediction block of the first transform block and a second prediction block of the second transform block; and
reconstructing the current block based on a first residual block, a second residual block, the first prediction block, and the second prediction block,
wherein the first residual block and the second residual block are obtained by performing a low frequency non-separable transform on each of the first transform block and the second transform block,
wherein the first prediction block and the second prediction block are generated by applying position-dependent intra prediction sample filtering.

7. The device of claim 6 ,
wherein whether the position-dependent intra prediction sample filtering is applied based on at least one of a width and a height of each of the transform blocks.

8. The device of claim 7 ,
wherein the width of each of the transform blocks is equal to or larger than a pre-configured reference value, and the height of each of the transform blocks is equal to or larger than the pre-configured reference value.

9. The device of claim 6 ,
wherein the position-dependent intra prediction sample filtering is applied by weighted combination of reference samples of each of the transform blocks.

10. The device of claim 6 ,
wherein a transform kernel for the low frequency non-separable transform is determined based on an intra prediction mode of the current block.

11. A method obtaining a bitstream,
wherein the method, comprises:
when an intra sub-partition (ISP) mode is applied to a current block, obtaining a plurality of transform blocks by dividing the current block based on a horizontal direction or a vertical direction,
wherein the plurality of transform blocks include a first transform block and a second transform block;
generating a first prediction block of the first transform block and a second prediction block of the second transform block;
reconstructing the current block based on a first residual block, a second residual block, the first prediction block, and the second prediction block; and
obtaining the bitstream including information for reconstructing the block,
wherein the first residual block and the second residual block are obtained by performing a low frequency non-separable transform on each of the first transform block and the second transform block,
wherein the first prediction block and the second prediction block are generated by applying position-dependent intra prediction sample filtering.

12. The method of claim 11 ,
wherein whether the position-dependent intra prediction sample filtering is applied based on at least one of a width and a height of each of the transform blocks.

13. The method of claim 12 ,
wherein the width of each of the transform blocks is equal to or larger than a pre-configured reference value, and the height of each of the transform blocks is equal to or larger than the pre-configured reference value.

14. The method of claim 11 ,
wherein the position-dependent intra prediction sample filtering is applied by weighted combination of reference samples of each of the transform blocks.

15. The method of claim 11 ,
wherein a transform kernel for the low frequency non-separable transform is determined based on an intra prediction mode of the current block.

Assignees

• Humax Co Ltd

Inventors

• Kim Dongcheol
• Ko Geonjung
• Jung Jaehong
• Son Juhyung
• Kwak Jinsam

Classifications

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/119 Primary

  Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks · CPC title

• H04N19/105 Primary

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/61 Primary

  in combination with predictive coding · CPC title