IP Library › Granted Patent US 12,452,408
Granted Patent B2
US 12,452,408 · App. 18/437,885 · Granted Oct 21, 2025

Image encoding/decoding method and device

Inventor: Ki Baek Kim (Daejeon, KR)
Assignee: B1 INSTITUTE OF IMAGE TECHNOLOGY, INC.
H04N19/105H04N19/176H04N19/186H04N19/30
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Quick Facts
Patent No.
US 12,452,408
App. No.
18/437,885
Granted
Oct 21, 2025
Kind
B2
Abstract

An image prediction method according to the present invention may comprise: identifying a reference pixel region designated for obtaining correlation information; determining a reference pixel processing configuration on the basis of determination of the availability of the reference pixel region; and performing intra prediction according to the determined reference pixel processing. As described above, performing intra prediction on the basis of the availability of a reference pixel according to the present invention can improve encoding performance.

Claims (32)

1. A method of decoding an image, comprising:

determining a prediction mode of a current chroma block as a mode that predicts the current chroma block from a luma block corresponding to the current chroma block;

obtaining a first prediction sample for the current chroma block based on the determination;

obtaining a second prediction sample for the current chroma block based on the determination;

obtaining a final prediction sample for the current chroma block based on the first prediction sample and the second prediction sample,

wherein the first prediction sample is predicted by using a non-directional (DC) mode, and

wherein the second prediction sample is obtained based on the luma block corresponding to the current chroma block.

2. The method of claim 1 , wherein the second prediction sample is obtained further based on correlation information between the current chroma block and the corresponding luma block.

3. The method of claim 2 , wherein the second prediction sample is obtained by applying the correlation information to a sample value of a luma component calculated based on sample values within the corresponding luma block.

4. The method of claim 2 , wherein the correlation information is obtained from a bitstream.

5. The method of claim 3 , wherein the sample value of the luma component is calculated based on subsampling and averaging for the sample values within the corresponding luma block.

6. A method of encoding an image, comprising:

determining a prediction mode of a current chroma block as a mode that predicts the current chroma block from a luma block corresponding to the current chroma block;

obtaining a first prediction sample for the current chroma block based on the determination;

obtaining a second prediction sample for the current chroma block based on the determination;

obtaining a final prediction sample for the current chroma block based on the first prediction sample and the second prediction sample,

wherein the first prediction sample is predicted by using a non-directional (DC) mode, and

wherein the second prediction sample is obtained based on the luma block corresponding to the current chroma block.

7. A method of transmitting a bitstream generated by an image encoding method, the image encoding method comprising:

determining a prediction mode of a current chroma block as a mode that predicts the current chroma block from a luma block corresponding to the current chroma block;

obtaining a first prediction sample for the current chroma block based on the determination;

obtaining a second prediction sample for the current chroma block based on the determination;

obtaining a final prediction sample for the current chroma block based on the first prediction sample and the second prediction sample,

wherein the first prediction sample is predicted by using a non-directional (DC) mode, and

wherein the second prediction sample is obtained based on the luma block corresponding to the current chroma block.

8. A non-transitory computer readable recording medium storing a bitstream generated by an image encoding method, the image encoding method comprising:

determining a prediction mode of a current chroma block as a mode that predicts the current chroma block from a luma block corresponding to the current chroma block;

obtaining a first prediction sample for the current chroma block based on the determination;

obtaining a second prediction sample for the current chroma block based on the determination;

obtaining a final prediction sample for the current chroma block based on the first prediction sample and the second prediction sample,

wherein the first prediction sample is predicted by using a non-directional (DC) mode, and

wherein the second prediction sample is obtained based on the luma block corresponding to the current chroma block.

Priority Claims (3)
KR 10-2018-0034174 · Mar 25, 2018 · national
KR 10-2018-0034882 · Mar 27, 2018 · national
KR 10-2018-0085679 · Jul 24, 2018 · national
Continuity (4)
Continuation 18366399 · Aug 7, 2023
Continuation 17874536 · Jul 27, 2022
Division 16980680
Related Publication 20240305770A1 · Sep 12, 2024
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