# US 2023/0058060 A1 · Image encoding/decoding method and recording medium therefor

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- Number: US 2023/0058060 A1
- Document ID: US20230058060A1
- Status: Published application
- Kind: A1
- Application number: 17/973,835
- Filed: 2022-10-26
- Published: 2023-02-23
- Earliest claimed: 2016-07-12
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Sung Chang LIM; Jung Won KANG; Hyun Suk KO; Ha Hyun LEE; Dong San JUN; Jin Ho LEE; Seung Hyun CHO; Hui Yong KIM; Jin Soo CHOI
- Web page: https://patentgrep.com/patent/US20230058060A1

## CPC

- H04N 19/583: Motion compensation with overlapping 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 19/176: the region being a block, e.g. a macroblock
- H04N 19/51: Motion estimation or motion compensation
- H04N 19/96: Tree coding, e.g. quad-tree coding
- 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 19/197: {including determination of the initial value of an encoding parameter (H04N19/56 takes precedence)}
- H04N 19/463: by compressing encoding parameters before transmission
- H04N 19/513: Processing of motion vectors
- H04N 19/56: Motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate a search
- H04N 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

The present invention relates to a method for encoding/decoding a video. To this end, the method for decoding a video may include: generating a merge candidate list of a current block including at least one merge candidate corresponding to each of a plurality of reference picture lists; determining at least one piece of motion information by using the merge candidate list; and generating a prediction block of the current block by using the determined at least one piece of motion information.

## Claims

### Claim 1

A method for decoding a video, the method comprising:
generating a merge candidate list for a current block;
deriving first motion information for first reference picture list and second motion information for second reference picture list from the merge candidate list of the current block; and
refining the first motion information and the second motion information based on a distortion calculated based on sum of absolute differences (SAD).

### Claim 2 (depends on 1)

The method of claim 1, wherein a prediction direction of the first reference picture list is different from a prediction direction of the second reference picture list.

### Claim 3 (depends on 1)

The method of claim 1, wherein the refined first motion information and the refined second motion information are derived in sub-block units of the current block.

### Claim 4

A method for encoding a video, the method comprising:
generating a merge candidate list for a current block;
deriving first motion information for first reference picture list and second motion information for second reference picture list from the merge candidate list of the current block; and
refining the first motion information and the second motion information based on a distortion calculated based on sum of absolute differences (SAD).

### Claim 5

A non-transitory computer readable medium storing a bitstream formed by a method for encoding a video, wherein the method comprises:
generating a merge candidate list for a current block;
deriving first motion information for first reference picture list and second motion information for second reference picture list from the merge candidate list of the current block; and
refining the first motion information and the second motion information based on a distortion calculated based on sum of absolute differences (SAD).