# US 2018/0027236 A1 · Method and device for encoding/decoding video signal by using adaptive scan order

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- Number: US 2018/0027236 A1
- Document ID: US20180027236A1
- Status: Published application
- Kind: A1
- Application number: 15/551,516
- Filed: 2016-02-17
- Published: 2018-01-25
- Earliest claimed: 2015-02-17
- Applicants: LG Electronics Inc.
- Inventors: Yongjoon JEON; Jin HEO; Sunmi YOO
- Web page: https://patentgrep.com/patent/US20180027236A1

## CPC

- H04N 19/129: Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
- H04N 19/12: Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/17: the unit being an image region, e.g. an object
- H04N 19/176: the region being a block, e.g. a macroblock
- 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 19/96: Tree coding, e.g. quad-tree coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method for decoding a video signal including extracting an intra prediction mode of a current block from the video signal; generating a prediction block based on scan order information corresponding to the intra prediction mode; and reconstructing the current block by using the generated prediction block and a residual block, and the scan order information is determined based on a direction of the intra prediction mode.

## Claims

### Claim 1

A method for decoding a video signal, comprising:
extracting an intra prediction mode of a current block from the video signal;
generating a prediction block based on scan order information corresponding to the intra prediction mode; and
reconstructing the current block by using the generated prediction block and a residual block,
wherein the scan order information is determined based on a direction of the intra prediction mode.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the scan order information is a variable derived according to the intra prediction mode.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the scan order information includes at least one of a raster scan, a vertical scan, a horizontal scan or a zigzag scan.

### Claim 4 (depends on 1)

The method of claim 1, further comprising
obtaining the scan order information from the video signal,
wherein the scan order information is obtained for each prediction unit.

### Claim 5 (depends on 4)

The method of claim 4, further comprising
obtaining a flag representing whether to transmit the scan order information for an intra prediction,
wherein the scan order information is obtained when the flag indicates a transmission of the scan order information for the intra prediction.

### Claim 6 (depends on 5)

The method of claim 5,
wherein the flag is defined in at least one level of a Sequence Parameter Set (SPS), a Picture Parameter Set (PPS), or a slice header.

### Claim 7 (depends on 1)

The method of claim 1,
wherein the scan order information corresponds to a raster scan when the intra prediction mode is less than 2,
wherein the scan order information corresponds to a horizontal scan when the intra prediction mode is 2 or more and less than 18, and
wherein the scan order information corresponds to a vertical scan when the intra prediction mode is 18 or more corresponds to the vertical scan.

### Claim 8

An apparatus for decoding a video signal, comprising:
a bitstream extracting unit configured to extract an intra prediction mode of a current block from the video signal;
an intra prediction unit configured to generate a prediction block based on scan order information corresponding to the intra prediction mode; and
a reconstruction unit configured to reconstruct the current block by using the generated prediction block and a residual block,
wherein the scan order information is determined based on a direction of the intra prediction mode.

### Claim 9 (depends on 8)

The apparatus of claim 8,
wherein the scan order information is a variable derived according to the intra prediction mode.

### Claim 10 (depends on 8)

The apparatus of claim 8,
wherein the scan order information includes at least one of a raster scan, a vertical scan, a horizontal scan or a zigzag scan.

### Claim 11 (depends on 8)

The apparatus of claim 8,
wherein the bitstream extracting unit extracts the scan order information from the video signal, and
wherein the scan order information is obtained for each prediction unit.

### Claim 12 (depends on 11)

The apparatus of claim 11,
wherein the bitstream extracting unit extracts a flag representing whether to transmit the scan order information for an intra prediction, and
wherein the scan order information is obtained when the flag indicates a transmission of the scan order information for the intra prediction.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein the flag is defined in at least one level of a Sequence Parameter Set (SPS), a Picture Parameter Set (PPS), or a slice header.

### Claim 14 (depends on 8)

The apparatus of claim 8,
wherein the scan order information corresponds to a raster scan when the intra prediction mode is less than 2,
wherein the scan order information corresponds to a horizontal scan when the intra prediction mode is 2 or more and less than 18, and
wherein the scan order information corresponds to a vertical scan when the intra prediction mode is 18 or more corresponds to the vertical scan.