# US 11,445,215 B2 · Method and device for image encoding and decoding, and recording medium having bit stream stored therein

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- Number: US 11,445,215 B2
- Document ID: US11445215B2
- Status: Granted
- Kind: B2
- Application number: 16/958,612
- Filed: 2018-12-28
- Published: 2020-10-22
- Granted: 2022-09-13
- Earliest claimed: 2017-12-28
- Assignees: Electronics and Telecommunications Research Institute; Chips & Media, Inc
- Applicants: Electronics and Telecommunications Research Institute; Chips&Media, Inc
- Inventors: Ha Hyun Lee; Jung Won Kang; Sung Chang Lim; Jin Ho Lee; Hui Yong Kim; Dae Yeon Kim; Dong Jin Park
- Web page: https://patentgrep.com/patent/US11445215B2

## CPC

- H04N 19/55: Motion estimation with spatial constraints, e.g. at image or region borders
- H04N 19/597: specially adapted for multi-view video sequence encoding
- H04N 19/182: the unit being a pixel
- H04N 19/563: Motion estimation with padding, i.e. with filling of non-object values in an arbitrarily shaped picture block or region for estimation purposes
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Disclosed is a method of decoding an image and a method of encoding an image. The method of decoding an image includes: obtaining motion-constrained tile set information; determining, on the basis of the motion-constrained tile set information, a first boundary region of a collocated tile set within a reference picture, which corresponds to a motion-constrained tile set; padding a second boundary region corresponding to the first boundary region; and performing inter prediction on the motion-constrained tile set by using a collocated tile set that includes the padded second boundary region.

## Claims

### Claim 1

A method of decoding an image, the method comprising:
obtaining motion-constrained region information;
deriving motion information; and
performing inter prediction based on the motion-constrained region information and the motion information,
when the motion-constrained region information indicates that motion-constrained region is applied, a configuration of motion-constrained region of a reference picture used for inter prediction is equal to a configuration of motion-constrained region of a current picture, and
when a reference sample value outside the motion-constrained region of the reference picture is required for the inter prediction, wherein the inter prediction is performed by using a sample value of a boundary of the motion-constrained region of the reference picture instead of the reference sample value outside the motion-constrained region of the reference picture.

### Claim 2 (depends on 1)

The method of claim 1, wherein the motion-constrained region represents a region where independent decoding process is performed.

### Claim 3 (depends on 1)

The method of claim 1, wherein the configuration of motion-constrained region includes a number of motion-constrained regions and a location for each of the motion-constrained regions.

### Claim 4 (depends on 1)

The method of claim 1, wherein the deriving motion information comprises:
constructing a motion information candidate list; and
deriving the motion information using the motion information candidate list,
wherein the motion information candidate list is constructed based on the motion-constrained region.

### Claim 5

A method of encoding an image, the method comprising:
determining motion-constrained region information;
determining motion information; and
performing inter prediction based on the motion-constrained region information and the motion information,
when the motion-constrained region information indicates that motion-constrained region is applied, a configuration of motion-constrained region of a reference picture used for inter prediction is equal to a configuration of motion-constrained region of a current picture, and
when a reference sample value outside the motion-constrained region of the reference picture is required for the inter prediction, wherein the inter prediction is performed by using a sample value of a boundary of the motion-constrained region of the reference picture instead of the reference sample value outside the motion-constrained region of the reference picture.

### Claim 6

A computer-readable non-transitory recording medium storing a bitstream formed by a method of encoding an image, the method comprising:
determining motion-constrained region information;
determining motion information; and
performing inter prediction based on the motion-constrained region information and the motion information,
when the motion-constrained region information indicates that motion-constrained region is applied, a configuration of motion-constrained region of a reference picture used for inter prediction is equal to a configuration of motion-constrained region of a current picture, and
when a reference sample value outside the motion-constrained region of the reference picture is required for the inter prediction, wherein the inter prediction is performed by using a sample value of a boundary of the motion-constrained region of the reference picture instead of the reference sample value outside the motion-constrained region of the reference picture.