IP Library › Granted Patent US 12,262,039
Granted Patent B2
US 12,262,039 · App. 17/713,693 · Granted Mar 25, 2025

Image decoding device using tool set and image decoding method thereby, and image encoding device and image encoding method thereby

Inventors: Woongil Choi (Suwon-si, KR); Minwoo Park (Suwon-si, KR); Kwangpyo Choi (Suwon-si, KR); Kiho Choi (Suwon-si, KR)
Assignee: SAMSUNG ELECTRONICS CO., LTD.
H04N19/46H04N19/176H04N19/184H04N19/189
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Quick Facts
Patent No.
US 12,262,039
App. No.
17/713,693
Granted
Mar 25, 2025
Kind
B2
Abstract

An image decoding method may include: receiving a bitstream generated as a result of encoding an image sequence; obtaining, from a sequence parameter set of the bitstream, a first tool set index indicating a tool allowed to decode the bitstream among a plurality of tools; obtaining, from the sequence parameter set, tool flags based on the tool flags, identifying a tool that has been used to encode the image sequence among the plurality of tools; and reconstructing the image sequence based on the identified tool, wherein values of the tool flags are set according to a value of the first tool set index.

Claims (41)

1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:

receiving a bitstream generated as a result of encoding an image sequence;

obtaining, from a sequence parameter set of the bitstream, a first tool set index and a second tool set index for indicating a tool allowed to decode the bitstream among a first tool and a second tool;

obtaining, from the sequence parameter set, a first tool flag indicating whether the first tool is used for the image sequence, and a second tool flag indicating whether the second tool is used for the image sequence;

from the first tool flag and the second tool flag, identifying a tool that is used for the image sequence; and

reconstructing the image sequence based on the identified tool,

wherein when a value of a first bit included in the first tool set index is 1 and a value of a first bit included in the second tool set index is 1, a value of the first tool flag is 1,

when the value of the first bit included in the first tool set index is 1 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0 or 1,

when the value of the first bit included in the first tool set index is 0 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0,

when a value of a second bit included in the first tool set index is 1 and a value of a second bit included in the second tool set index is 1, a value of the second tool flag is 1,

when the value of the second bit included in the first tool set index is 1 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0 or 1, and

when the value of the second bit included in the first tool set index is 0 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0,

wherein when the value of the first bit included in the first tool set index is 0, the value of the first bit included in the second tool set index is set to 0.

2. An image decoding apparatus comprising:

a memory storing instructions; and

at least one processor configured to execute the instructions to:

receive a bitstream generated as a result of encoding an image sequence;

obtain, from a sequence parameter set of the bitstream, a first tool set index and a second tool set index for indicating a tool allowed to decode the bitstream among a first tool and a second tool;

obtain, from the sequence parameter set, a first tool flag indicating whether the first tool is used for the image sequence, and a second tool flag indicating whether the second tool is used for the image sequence;

from the first tool flag and the second tool flag, identify a tool that is used for the image sequence; and

reconstruct the image sequence based on the identified tool,

wherein when a value of a first bit included in the first tool set index is 1 and a value of a first bit included in the second tool set index is 1, a value of the first tool flag is 1,

when the value of the first bit included in the first tool set index is 1 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0 or 1,

when the value of the first bit included in the first tool set index is 0 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0,

when a value of a second bit included in the first tool set index is 1 and a value of a second bit included in the second tool set index is 1, a value of the second tool flag is 1,

when the value of the second bit included in the first tool set index is 1 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0 or 1, and

when the value of the second bit included in the first tool set index is 0 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0,

wherein when the value of the first bit included in the first tool set index is 0, the value of the first bit included in the second tool set index is set to 0.

3. An image encoding method performed by an image encoding apparatus, the image encoding method comprising:

encoding an image sequence based on at least one tool selected from among a first tool and a second tool;

generating a first tool set index and a second tool set index for indicating a tool allowed to decode a bitstream, among the first tool and the second tool;

generating a first tool flag indicating whether the first tool is used for the image sequence, and a second tool flag indicating whether the second tool is used for the image sequence; and

generating the bitstream including the first tool set index, the second tool set index, the first tool flag, and the second tool flag,

wherein when a value of a first bit included in the first tool set index is 1 and a value of a first bit included in the second tool set index is 1, a value of the first tool flag is 1,

when the value of the first bit included in the first tool set index is 1 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0 or 1,

when the value of the first bit included in the first tool set index is 0 and the value of the first bit included in the second tool set index is 0, the value of the first tool flag is 0,

when a value of a second bit included in the first tool set index is 1 and a value of a second bit included in the second tool set index is 1, a value of the second tool flag is 1,

when the value of the second bit included in the first tool set index is 1 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0 or 1, and

when the value of the second bit included in the first tool set index is 0 and the value of the second bit included in the second tool set index is 0, the value of the second tool flag is 0,

wherein when the value of the first bit included in the first tool set index is 0, the value of the first bit included in the second tool set index is set to 0.

4. A method of transmitting the bitstream generated by the image encoding method of claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 5, 2022
From: CHOI, WOONGIL; PARK, MINWOO; CHOI, KWANGPYO; CHOI, KIHO
To: SAMSUNG ELECTRONICS CO., LTD.
Reel/Frame 059506/0352 →
Priority Claims (1)
KR 10-2020-0119872 · Sep 17, 2020 · national
Continuity (3)
Continuation PCTKR2020013555 · Oct 6, 2020
Provisional Application 62913264 · Oct 10, 2019
Related Publication 20220232237A1 · Jul 21, 2022
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