# US 11,445,179 B2 · Method and apparatus for processing video signal

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- Number: US 11,445,179 B2
- Document ID: US11445179B2
- Status: Granted
- Kind: B2
- Application number: 17/125,076
- 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/US11445179B2

## 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 of decoding a video, the method comprising:
determining whether to divide a coding block into a plurality of partitions or not;
obtaining a transform skip flag for a current block, the current block being the coding block or one of the plurality of partitions;
determining, based on the transform skip flag, whether to skip an inverse-transform for the current block or not; and
obtaining residual samples of the current block by skipping or performing the inverse-transform on the current block,
wherein when the current block is one of the plurality of partitions generated by dividing the coding block, the transform skip flag for the current block is not parsed from a bitstream, and it is determined that the inverse-transform for the current block is not skipped.

### Claim 2 (depends on 1)

The method of claim 1, wherein whether it is allowed to divide the coding block in a horizontal direction or in a vertical direction is determined by comparing a size of the coding block with a threshold value.

### Claim 3 (depends on 2)

The method of claim 2, wherein when it is determined to divide the coding block, the coding block is divided into either 4 partitions or 2 partitions.

### Claim 4 (depends on 3)

The method of claim 3, wherein the coding block is divided in only one of the horizontal direction or the vertical direction.

### Claim 5 (depends on 4)

The method of claim 4, wherein the number of partitions generated by dividing the coding block is adaptively determined based on the size of the coding block.

### Claim 6

A method of encoding a video, the method comprising:
determining whether to divide a coding block into a plurality of partitions or not;
determining whether to skip a transform for a current block or not, the current block being the coding block or one of the plurality of partitions;
determining whether to encode a transform skip flag for the current block; and
obtaining residual coefficients of the current block by skipping or performing the transform on the current block,
wherein when the current block is one of the plurality of partitions generated by dividing the coding block, the transform skip flag for the current block is not encoded into a bitstream, and it is determined that the transform for the current block is not skipped.

### Claim 7

A non-transitory computer readable medium having stored thereon a compressed video data, comprising:
a data stream including residual coefficients of a current block,
wherein the current block is representative of a coding block or one of a plurality of partitions resulting from dividing the coding block,
wherein residual samples of the current block are generated by skipping or performing an inverse-transform for the current block,
wherein whether to skip the inverse-transform for the current block or not is determined based on a transform skip flag of the current block,
wherein when the current block is one of the plurality of partitions generated by dividing the coding block, the transform skip flag for the current block is not included in the data stream, and it is determined that the inverse-transform for the current block is not skipped.