# US 12,764,329 B2 · Method and device for transmitting image information, and decoding method and device using same

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- Number: US 12,764,329 B2
- Document ID: US12764329B2
- Status: Granted
- Kind: B2
- Application number: 19/020,497
- Filed: 2025-01-14
- Published: 2025-05-15
- Granted: 2026-10-13
- Earliest claimed: 2011-11-11
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Byeongmoon Jeon; Hendry Hendry; Jaehyun Lim; Yongjoon Jeon; Chulkeun Kim; Jungsun Kim; Seungwook Park; Joonyoung Park; Sangoh Jeong; Naeri Park
- Web page: https://patentgrep.com/patent/US12764329B2

## CPC

- H04N 19/593: involving spatial prediction techniques
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image decoding method according to the present invention comprises the steps of: acquiring information to form a reference picture set of a current picture by entropy decoding the received bitstream information; and performing prediction on a prediction block inside the current picture by using a reference picture list which is formed based on the reference picture set.

## Claims

### Claim 1

A decoding apparatus for decoding an image, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
acquire first long term reference picture (LTRP) information in a sequence parameter set (SPS) from a bitstream;
acquire second LTRP information in a slice header from the bitstream;
configure a reference picture set based on the first LTRP information and the second LTRP information; and
perform an inter prediction on a current block in a current picture by using an LTRP in the reference picture set, wherein the LTRP is one of candidate LTRPs specified by the first LTRP information in the SPS,
wherein the reference picture set comprises an LTRP set including at least one LTRP,
wherein the first LTRP information in the SPS includes a long term reference pictures present flag,
wherein based on a value of the long term reference pictures present flag being equal to 1,
the first LTRP information in the SPS further includes an LTRP number syntax element specifying a number of the candidate LTRPs specified in the SPS and LTRP picture order count (POC) least significant bit (LSB) information specifying an LSB of a POC of each of the candidate LTRPs,
the first LTRP information in the SPS further includes used by current picture long term SPS flag information specifying whether each of the candidate LTRPs specified in the SPS is not used for a reference picture by the current picture, and
wherein the second LTRP information in the slice header includes LTRP index information specifying an LTRP to be included in the LTRP set among the candidate LTRPs specified in the SPS.

### Claim 2

An encoding apparatus for encoding an image, the encoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
derive long term reference pictures (LTRPs) for a current picture;
generate first LTRP information and second LTRP information used for configuring a reference picture set for the current picture; and
encode the first LTRP information in a sequence parameter set (SPS) and the second LTRP information in a slice header,
wherein the reference picture set comprises an LTRP set including at least one LTRP,
wherein the first LTRP information in the SPS includes a long term reference pictures present flag,
wherein based on a value of the long term reference pictures present flag being equal to 1,
the first LTRP information in the SPS further includes an LTRP number syntax element specifying a number of the candidate LTRPs specified in the SPS and LTRP picture order count (POC) least significant bit (LSB) information specifying an LSB of a POC of each of the candidate LTRPs,
the first LTRP information in the SPS further includes used by current picture long term SPS flag information specifying whether each of the candidate LTRPs specified in the SPS is not used for a reference picture by the current picture, and
wherein the second LTRP information in the slice header includes LTRP index information specifying an LTRP to be included in the LTRP set among the candidate LTRPs specified in the SPS.

### Claim 3 (depends on 2)

A non-transitory computer-readable digital storage medium storing a bitstream, wherein the bitstream is generated by the encoding apparatus of claim 2.

### Claim 4

An apparatus for transmitting data for an image, the apparatus comprising:
at least one processor configured to obtain a bitstream for the image, wherein the bitstream is generated based on deriving long term reference pictures (LTRPs) for a current picture, generating first LTRP information and second LTRP information used for configuring a reference picture set for the current picture, and encoding the first LTRP information in a sequence parameter set (SPS) and the second LTRP information in a slice header; and
a transmitter configured to transmit the data comprising the bitstream,
wherein the reference picture set comprises an LTRP set including at least one LTRP,
wherein the first LTRP information in the SPS includes a long term reference pictures present flag,
wherein based on a value of the long term reference pictures present flag being equal to 1,
the first LTRP information in the SPS further includes an LTRP number syntax element specifying a number of the candidate LTRPs specified in the SPS and LTRP picture order count (POC) least significant bit (LSB) information specifying an LSB of a POC of each of the candidate LTRPs,
the first LTRP information in the SPS further includes used by current picture long term SPS flag information specifying whether each of the candidate LTRPs specified in the SPS is not used for a reference picture by the current picture, and
wherein the second LTRP information in the slice header includes LTRP index information specifying an LTRP to be included in the LTRP set among the candidate LTRPs specified in the SPS.