# US 2021/0243469 A1 · Encoder, decoder, encoding method, and decoding method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0243469 A1
- Document ID: US20210243469A1
- Status: Published application
- Kind: A1
- Application number: 17/230,725
- Filed: 2021-04-14
- Published: 2021-08-05
- Earliest claimed: 2018-07-18
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Jing Ya LI; Chong Soon LIM; Sughosh Pavan SHASHIDHAR; Ru Ling LIAO; Hai Wei SUN; Han Boon TEO; Kiyofumi ABE; Tadamasa TOMA; Takahiro NISHI
- Web page: https://patentgrep.com/patent/US20210243469A1

## CPC

- H04N 19/52: by predictive encoding
- H04N 19/521: {for estimating the reliability of the determined motion vectors or motion vector field, e.g. for smoothing the motion vector field or for correcting motion vectors}
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/96: Tree coding, e.g. quad-tree coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An encoder includes circuitry and memory connected to the circuitry. In operation, the circuitry corrects a base motion vector using a correction value in a fixed direction; and encodes a current partition by using the corrected base motion vector corrected. The correction value is specified by an index indicating one of correction values included in a table. The table is selected from among a plurality of tables, wherein the correction values in one of the plurality of tables have different increments from the correction values in another one of the plurality of tables.

## Claims

### Claim 1

A decoder, comprising:
circuitry; and
memory connected to the circuitry,
wherein, in operation, the circuitry:
corrects a base motion vector using a correction value in a fixed direction; and
decodes a current partition by using the corrected base motion vector corrected,
wherein the correction value is specified by an index indicating one of correction values included in a table, and
the table is selected from among a plurality of tables, wherein the correction values in one of the plurality of tables have different increments from the correction values in another one of the plurality of tables.

### Claim 2 (depends on 1)

The decoder according to claim 1,
wherein the plurality of tables include a first table including the correction values that are sub-pixel values, and a second table including the correction values that are integer-pixel values.

### Claim 3 (depends on 2)

The decoder according to claim 2,
wherein the correction values in the first table are quarter-pixel values.

### Claim 4 (depends on 1)

The decoder according to claim 1,
wherein the correction value is specified by the index and a first parameter, and the first parameter indicates the table to be selected from among the plurality of tables.

### Claim 5 (depends on 1)

The decoder according to claim 1,
wherein the current partition is included in a picture.

### Claim 6

An encoder, comprising:
circuitry; and
memory connected to the circuitry,
wherein, in operation, the circuitry:
corrects a base motion vector using a correction value in a fixed direction; and
encodes a current partition by using the corrected base motion vector corrected,
wherein the correction value is specified by an index indicating one of correction values included in a table, and
the table is selected from among a plurality of tables, wherein the correction values in one of the plurality of tables have different increments from the correction values in another one of the plurality of tables.

### Claim 7 (depends on 6)

The encoder according to claim 6,
wherein the plurality of tables include a first table including the correction values that are sub-pixel values, and a second table including the correction values that are integer-pixel values.

### Claim 8 (depends on 7)

The encoder according to claim 7,
wherein the correction values in the first table are quarter-pixel values.

### Claim 9 (depends on 6)

The encoder according to claim 6,
wherein the correction value is specified by the index and a first parameter, and the first parameter indicates the table to be selected from among the plurality of tables.

### Claim 10 (depends on 6)

The encoder according to claim 6,
wherein the current partition is included in a picture.