# US 12,225,185 B2 · Method and apparatus for encoding/decoding an image signal

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- Number: US 12,225,185 B2
- Document ID: US12225185B2
- Status: Granted
- Kind: B2
- Application number: 17/981,841
- Filed: 2022-11-07
- Published: 2023-03-02
- Granted: 2025-02-11
- Earliest claimed: 2017-01-16
- Assignees: Industry Academy Cooperation Foundation of Sejong University
- Applicants: Industry Academy Cooperation Foundation of Sejong University
- Inventors: Joo Hee Moon; Dong Jae Won; Sung Won Lim
- Web page: https://patentgrep.com/patent/US12225185B2

## CPC

- H04N 19/103: Selection of coding mode or of prediction mode
- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N 19/124: Quantisation
- H04N 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- 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 19/423: characterised by memory arrangements (H04N19/433 takes precedence)
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/51: Motion estimation or motion compensation
- H04N 19/52: by predictive encoding
- H04N 19/573: Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Disclosed are an image encoding/decoding method and apparatus. The image decoding method includes decoding coding mode information of a current coding block, dividing the current coding block into at least one prediction block, and generating prediction samples of the at least one prediction block on the basis of the decoded coding mode, in which the coding mode information is information Indicating any one mode among intra mode, inter mode, and hybrid mode.

## Claims

### Claim 1

A method of decoding an image signal, comprising:
dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;
generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block; and
generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block,
wherein the first sub-block includes a top-left pixel in the current coding block,
wherein the second sub-block includes a bottom-right pixel in the current coding block,
wherein a size of the second sub-block is ¼ of a size of the current coding block, and
wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.

### Claim 2 (depends on 1)

The method of claim 1, wherein a division type of the division of the current coding block is determined based on division type information signaled from a bitstream.

### Claim 3 (depends on 2)

The method of claim 2, wherein the division type of the division of the current coding block includes dividing the current coding block into ¼ size.

### Claim 4 (depends on 3)

The method of claim 3, wherein whether to divide the current coding block is determined based on mode information signaled from the bitstream.

### Claim 5

A method of encoding an image signal, comprising:
dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;
generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block; and
generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block,
wherein the first sub-block includes a top-left pixel in the current coding block,
wherein the second sub-block includes a bottom-right pixel in the current coding block,
wherein a size of the second sub-block is ¼ of a size of the current coding block, and
wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.

### Claim 6

A method of transmitting a bitstream, comprising:
dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;
generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block;
generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block;
generating the bitstream by encoding the current block based on the prediction sample of the first sub-block and the prediction sample of the second sub-block; and
transmitting the bitstream,
wherein the first sub-block includes a top-left pixel in the current coding block,
wherein the second sub-block includes a bottom-right pixel in the current coding block,
wherein a size of the second sub-block is ¼ of a size of the current coding block, and
wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.