# US 2020/0404262 A1 · Image coding method, image decoding method, image coding apparatus, and image decoding apparatus

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- Number: US 2020/0404262 A1
- Document ID: US20200404262A1
- Status: Published application
- Kind: A1
- Application number: 17/011,452
- Filed: 2020-09-03
- Published: 2020-12-24
- Earliest claimed: 2010-09-24
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Toshiyasu SUGIO; Takahiro NISHI; Youji SHIBAHARA; Hisao SASAI
- Web page: https://patentgrep.com/patent/US20200404262A1

## CPC

- H04N 19/115: Selection of the code volume for a coding unit prior to coding
- H04N 19/103: Selection of coding mode or of prediction mode
- H04N 19/146: Data rate or code amount at the encoder output
- H04N 19/172: the region being a picture, frame or field
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/51: Motion estimation or motion compensation
- H04N 19/52: by predictive encoding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image coding method includes: generating a first flag indicating whether or not a motion vector predictor is to be selected from among one or more motion vector predictor candidates; generating a second flag indicating whether or not a motion vector predictor is to be selected from among the one or more motion vector predictor candidates in coding a current block to be coded in a predetermined coding mode, when the first flag indicates that a motion vector predictor is to be selected; and generating a coded signal in which the first flag and the second flag are included in header information, when the first flag indicates that a motion vector predictor is to be selected.

## Claims

### Claim at position 1

1-2. (canceled)

### Claim 3

An image coding method comprising:
generating first information indicating whether or not a motion vector predictor can be selected from among one or more motion vector predictor candidates;
generating second information indicating whether or not a motion vector predictor is selected, in skip mode, from among the one or more motion vector predictor candidates for coding a current block to be coded, when the first information indicates that a motion vector predictor can be selected;
generating a coded signal in which the first information and the second information are included, when the first information indicates that a motion vector predictor can be selected;
including, in the coded signal, index information indicating a motion vector predictor to be selected from among the one or more motion vector predictor candidates, when both (a) the first information indicates that a motion vector predictor can be selected and (b) the second information indicates that a motion vector predictor is selected, in the skip mode, for the coding of the current block; and
coding the current block using the motion vector predictor selected based on the index information.

### Claim 4

An image coding apparatus that performs prediction coding of moving pictures, the image coding apparatus comprising:
a first information generating unit configured to generate first information indicating whether or not a motion vector predictor can be selected from among one or more motion vector predictor candidates;
a second information generating unit configured to generate second information indicating whether or not a motion vector predictor is selected, in skip mode, from among the one or more motion vector predictor candidates for coding a current block to be coded, when the first information indicates that a motion vector predictor can be selected; and
a variable-length coding unit configured to generate a coded signal in which the first information and the second information are included, when the first information indicates that a motion vector predictor can be selected,
wherein the variable-length coding unit includes, in the coded signal, index information indicating a motion vector predictor to be selected from among the one or more motion vector predictor candidates, when both (a) the first information indicates that a motion vector predictor can be selected and (b) the second information indicates that a motion vector predictor is selected, in the skip mode, for the coding of the current block, and
the variable-length coding unit codes the current block using the motion vector predictor selected based on the index information.