# US 11,909,970 B2 · Image encoding method/device, image decoding method/device, and recording medium in which bitstream is stored

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- Number: US 11,909,970 B2
- Document ID: US11909970B2
- Status: Granted
- Kind: B2
- Application number: 18/468,555
- Filed: 2023-09-15
- Published: 2024-01-04
- Granted: 2024-02-20
- Earliest claimed: 2016-10-14
- Assignees: Industry Academy Cooperation Foundation of Sejong University
- Applicants: Industry Academy Cooperation Foundation of Sejong University
- Inventors: Joo Hee Moon; Sung Won Lim; Dong Jae Won
- Web page: https://patentgrep.com/patent/US11909970B2

## CPC

- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- 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 19/167: Position within a video image, e.g. region of interest [ROI]
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/192: the adaptation method, adaptation tool or adaptation type being iterative or recursive
- H04N 19/96: Tree coding, e.g. quad-tree coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

The present invention provides an image encoding method and an image decoding method. The image encoding method of the present invention comprises: a first dividing step of dividing a current image into a plurality of blocks; and a second dividing step of dividing, into a plurality of sub blocks, a block, which is to be divided and includes a boundary of the current image, among the plurality of blocks, wherein the second dividing step is recursively performed by setting a sub block including the boundary of the current images as the block to be divided, until the sub block including the boundary of the current image does not exist among the sub blocks.

## Claims

### Claim 1

A video decoding method comprising:
determining a partition type of an upper block including a current block;
deriving a reference candidate list for the current block based on the partition type of the upper block;
deriving prediction information of the current block based on the reference candidate list;
generating a prediction block of the current block based on the prediction information; and
reconstructing the current block based on the prediction block and a residual block of the current block,
wherein the reference candidate list includes at least one candidate block, and
wherein, when the upper block includes a neighboring block adjacent to the current block, the reference candidate list for the current block includes a candidate block adjacent to the neighboring block but not to the current block.

### Claim 2 (depends on 1)

The video decoding method of claim 1,
the residual block being generated by performing inverse transform on a transform block of the current block.

### Claim 3

A video encoding method comprising:
determining a partition type of an upper block including a current block;
deriving a reference candidate list for the current block based on the partition type of the upper block;
generating a prediction block of the current block based on the reference candidate list;
encoding prediction information of the current block based on the prediction block; and
reconstructing the current block based on the prediction block and a residual block of the current block,
wherein the reference candidate list includes at least one candidate block, and
wherein, when the upper block includes a neighboring block adjacent to the current block, the reference candidate list for the current block includes a candidate block adjacent to the neighboring block but not to the current block.

### Claim 4

A non-transitory computer-readable recording medium storing a bitstream generated by a video encoding method with a video encoding apparatus, the video encoding method comprises:
determining a partition type of an upper block including a current block;
deriving a reference candidate list for the current block based on the partition type of the upper block;
generating a prediction block of the current block based on the reference candidate list;
reconstructing the current block based on the prediction block and a residual block of the current block; and
encoding prediction information of the current block based on the prediction block into a bitstream,
wherein the reference candidate list includes at least one candidate block, and
wherein, when the upper block includes a neighboring block adjacent to the current block, the reference candidate list for the current block includes a candidate block adjacent to the neighboring block but not to the current block.