# US 2025/0168359 A1 · Method and apparatus for image encoding/decoding, and recording medium storing bitstream

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- Number: US 2025/0168359 A1
- Document ID: US20250168359A1
- Status: Published application
- Kind: A1
- Application number: 19/024,733
- Filed: 2025-01-16
- Published: 2025-05-22
- Earliest claimed: 2017-11-28
- Assignees: Lx Semicon Co., Ltd.
- Applicants: LX Semicon Co., Ltd.
- Inventors: Sung Chang LIM; Hyun Suk KO; Jung Won KANG; Jin Ho LEE; HA Hyun LEE; Dong San Jun; Hui Yong KIM
- Web page: https://patentgrep.com/patent/US20250168359A1

## CPC

- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
- H04N 19/11: among a plurality of spatial predictive coding modes
- H04N 19/132: Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/197: {including determination of the initial value of an encoding parameter (H04N19/56 takes precedence)}
- H04N 19/593: involving spatial prediction techniques
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image encoding/decoding method and apparatus for performing intra prediction mode based intra prediction are provided. An image decoding method may comprise decoding an intra prediction mode of a current block, deriving at least one intra prediction mode from the decoded intra prediction mode of the current block, generating two or more intra prediction blocks using the intra prediction mode of the current block and the derived intra prediction mode, and generating an intra prediction block of the current block based on the two or more intra prediction blocks.

## Claims

### Claim 1

An image decoding method performed by an image decoding apparatus, the method comprising:
receiving partition information for a coding tree unit and size information;
partitioning a split target block in the coding tree unit into a plurality of coding units based on the partition information;
performing intra prediction for each of the plurality of coding units; and
generating a reconstructed picture based on the intra prediction,
wherein a partition type for the coding tree unit includes at least one of quad tree split, binary tree split and ternary tree split,
wherein the partition information includes quad tree split information for the quad tree split and multi-type tree split information for the binary tree split and the ternary tree split,
wherein the size information includes information related to a maximum size of the binary tree split and information related to a maximum size of the ternary tree split,
wherein based on a size of the split target block being greater than the maximum size of a binary tree, the split target block is not split into the binary tree,
wherein based on a size of the split target block being greater than the maximum size of a ternary tree, the split target block is not split into the ternary tree,
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the binary tree, and
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the ternary tree.

### Claim 2

An image encoding method performed by an image encoding apparatus, the method comprising:
partitioning a split target block in a coding tree unit into a plurality of coding units;
performing intra prediction for each of the plurality of coding units; and
encoding image information including partition information for the coding tree unit and size information,
wherein a partition type for the coding tree unit includes at least one of quad tree split, binary tree split and ternary tree split,
wherein the partition information includes quad tree split information for the quad tree split and multi-type tree split information for the binary tree split and the ternary tree split,
wherein the size information includes information related to a maximum size of the binary tree split and information related to a maximum size of the ternary tree split,
wherein based on a size of the split target block being greater than the maximum size of a binary tree, the split target block is not split into the binary tree,
wherein based on a size of the split target block being greater than the maximum size of a ternary tree, the split target block is not split into the ternary tree,
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the binary tree, and
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the ternary tree.

### Claim 3 (depends on 2)

A non-transitory computer-readable recording-medium storing a bitstream which is generated by the image encoding method of claim 2.

### Claim 4

A transmission method for image data, the method comprising:
obtaining a bitstream for encoded image information, wherein the encoded image information is generated based on partitioning a split target block in a coding tree unit into a plurality of coding units, performing intra prediction for each of the plurality of coding units, and encoding image information including partition information for the coding tree unit and size information; and
transmitting the image data comprising the bitstream,
wherein a partition type for the coding tree unit includes at least one of quad tree split, binary tree split and ternary tree split,
wherein the partition information includes quad tree split information for the quad tree split and multi-type tree split information for the binary tree split and the ternary tree split,
wherein the size information includes information related to a maximum size of the binary tree split and information related to a maximum size of the ternary tree split,
wherein based on a size of the split target block being greater than the maximum size of a binary tree, the split target block is not split into the binary tree,
wherein based on a size of the split target block being greater than the maximum size of a ternary tree, the split target block is not split into the ternary tree,
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the binary tree, and
wherein based on a multi-type tree depth of the split target block being equal to a maximum multi-type tree depth, the split target block is not split into the ternary tree.