# US 11,445,178 B2 · Method and apparatus for processing video signal

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- Number: US 11,445,178 B2
- Document ID: US11445178B2
- Status: Granted
- Kind: B2
- Application number: 17/124,929
- Filed: 2020-12-17
- Published: 2021-04-08
- Granted: 2022-09-13
- Earliest claimed: 2016-06-24
- Assignees: Kt Corporation
- Applicants: Kt Corporation
- Inventors: Bae Keun Lee
- Web page: https://patentgrep.com/patent/US11445178B2

## CPC

- H04N 19/105: 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
- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/10: using adaptive coding
- H04N 19/107: between spatial and temporal predictive coding, e.g. picture refresh
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N 19/157: Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/182: the unit being a pixel
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/593: involving spatial prediction techniques
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method for decoding a video according to the present invention may comprise: deriving a plurality of reference sample lines for a current block, selecting at least one among the plurality of reference sample lines, determining whether to apply an intra filter to a reference sample included in the selected reference sample line, selectively applying the intra filter to the reference sample according to the determination, and performing intra prediction for the current block using the reference sample.

## Claims

### Claim 1

A method for decoding a video, the method comprising:
selecting a reference sample line of a current block among a plurality of reference sample lines;
performing intra prediction for the current block based on the selected reference sample line and an intra prediction mode of the current block;
reconstructing the current block based on prediction samples of the current block; and
applying a deblocking filter to the reconstructed current block,
wherein if a distance between the current block and the selected reference sample line is greater than a pre-determined value, at least one non-directional intra prediction mode is unavailable as the intra prediction mode of the current block, the at least one non-directional intra prediction mode comprising at least one of DC mode or Planar mode.

### Claim 2 (depends on 1)

The method of claim 1, wherein when the intra prediction mode of the current block has a direction of top-right diagonal or bottom-left diagonal, a prediction sample resultant from the intra prediction is modified by using a reference sample included in a neighboring block adjacent to the current block.

### Claim 3 (depends on 2)

The method of claim 2, wherein the reference sample comprises at least one of a sample toward a reverse direction of the intra prediction mode.

### Claim 4

A method for encoding a video, the method comprising:
selecting a reference sample line of a current block among a plurality of reference sample lines;
performing intra prediction for the current block based on the selected reference sample line and an intra prediction mode of the current block; and
reconstructing the current block based on prediction samples of the current block; and
applying a deblocking filter to the reconstructed current block,
wherein if a distance between the current block and the selected reference sample line is greater than a pre-determined value, at least one non-directional intra prediction mode is unavailable as the intra prediction mode of the current block, the at least one non-directional intra prediction mode comprising at least one of DC mode or Planar mode.

### Claim 5 (depends on 4)

The method of claim 4, wherein when the intra prediction mode of the current block has a direction of top-right diagonal or bottom-left diagonal, a prediction sample resultant from the intra prediction is modified by using a reference sample included in a neighboring block adjacent to the current block.

### Claim 6 (depends on 5)

The method of claim 5, wherein the reference sample comprises at least one of a sample toward a reverse direction of the intra prediction mode.

### Claim 7

A non-transitory computer-readable medium for storing compressed data associated with a video signal, the compressed data comprising:
index information for selecting a reference sample line of a current block among a plurality of reference sample lines,
wherein a deblocking filter is applied to the current block reconstructed by intra prediction,
wherein the current block is reconstructed based on prediction samples resulting from the intra prediction for the current block,
wherein the intra prediction for the current block is performed based on the reference sample line selected by the index information and an intra prediction mode of the current block,
wherein if a distance between the current block and the selected reference sample line is greater than a pre-determined value, at least one non-directional intra prediction mode is unavailable as the intra prediction mode of the current block, and
wherein the at least one non-directional intra prediction mode comprising at least one of DC mode or Planar mode.