# US 11,115,664 B2 · Image coding method, image coding apparatus, image decoding method, image decoding apparatus, and image coding and decoding apparatus

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- Number: US 11,115,664 B2
- Document ID: US11115664B2
- Status: Granted
- Kind: B2
- Application number: 16/882,872
- Filed: 2020-05-26
- Published: 2020-09-10
- Granted: 2021-09-07
- Earliest claimed: 2011-05-27
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Toshiyasu Sugio; Takahiro Nishi; Youji Shibahara; Kyoko Tanikawa; Hisao Sasai; Toru Matsunobu
- Web page: https://patentgrep.com/patent/US11115664B2

## CPC

- H04N 19/139: Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
- H04N 19/102: characterised by the element, parameter or selection affected or controlled by the adaptive coding
- 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 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- H04N 19/134: characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- 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 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 19/184: the unit being bits, e.g. of the compressed video stream
- H04N 19/197: {including determination of the initial value of an encoding parameter (H04N19/56 takes precedence)}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A moving picture coding apparatus, method, and medium for coding a current block are provided. A first candidate is derived from a first motion vector that has been used to decode a first block. The first block is adjacent to the current block. A first index identifying a reference picture to be selected for coding the current block is coded. A second candidate having a second motion vector that includes a non-zero value is derived. The non-zero value is assigned to the reference picture. A selected candidate is selected from a plurality of candidates, including the first candidate and the second candidate. A second index identifying the selected candidate is coded. The current block is coded using the selected candidate. The second candidate includes the non-zero value of the reference picture, with the reference picture being selected from a plurality of referable reference pictures.

## Claims

### Claim 1

A moving picture coding apparatus for coding a current block, the moving picture coding apparatus comprising:
a processor; and
a non-transitory memory,
wherein the processor performs, using the non-transitory memory, processes including:
deriving a first candidate from a first motion vector that has been used to code a first block, the first block being adjacent to the current block;
coding a first index identifying a reference picture selected for coding the current block;
deriving a second candidate having a second motion vector that includes a non-zero value, the non-zero value assigned to the reference picture;
selecting a selected candidate to be used for coding the current block from a plurality of candidates, the plurality of candidates including the first candidate and the second candidate;
coding a second index identifying the selected candidate; and
coding the current block using the selected candidate, and
the second candidate includes the non-zero value of the reference picture, the reference picture being selected from a plurality of referable reference pictures based on the first index.

### Claim 2 (depends on 1)

The moving picture coding apparatus according to claim 1, wherein
different offset values are assigned as non-zero values for the plurality of referable reference pictures.

### Claim 3 (depends on 2)

The moving picture coding apparatus according to claim 2, wherein
each of the non-zero values for the plurality of referable reference pictures includes an x-axis offset value and a y-axis offset value.

### Claim 4

A moving picture coding method for coding a current block, the moving picture coding method comprising:
deriving a first candidate from a first motion vector that has been used to code a first block, the first block being adjacent to the current block;
coding a first index identifying a reference picture selected for coding the current block;
deriving a second candidate having a second motion vector that includes a non-zero value, the non-zero value assigned to the reference picture;
selecting a selected candidate to be used for coding the current block from a plurality of candidates, the plurality of candidates including the first candidate and the second candidate;
coding a second index identifying the selected candidate; and
coding the current block using the selected candidate,
wherein the second candidate includes the non-zero value of the reference picture, the reference picture being selected from a plurality of referable reference pictures based on the first index.

### Claim 5 (depends on 4)

The moving picture coding method according to claim 4, wherein
different offset values are assigned as non-zero values for the plurality of referable reference pictures.

### Claim 6 (depends on 5)

The moving picture coding method according to claim 5, wherein
each of the non-zero values for the plurality of referable reference pictures includes an x-axis offset value and a y-axis offset value.

### Claim 7

A non-transitory computer-readable medium including a program for coding a current block, the program, when executed by a processor, causing the processor to perform processes, the processes comprising:
deriving a first candidate from a first motion vector that has been used to code a first block, the first block being adjacent to the current block;
coding a first index identifying a reference picture selected for coding the current block;
deriving a second candidate having a second motion vector that includes a non-zero value, the non-zero value assigned to the reference picture;
selecting a selected candidate to be used for coding the current block from a plurality of candidates, the plurality of candidates including the first candidate and the second candidate;
coding a second index identifying the selected candidate; and
coding the current block using the selected candidate,
wherein the second candidate includes the non-zero value of the reference picture, the reference picture being selected from a plurality of referable reference pictures based on the first index.

### Claim 8 (depends on 7)

The non-transitory computer-readable medium according to claim 7, wherein
different offset values are assigned as non-zero values for the plurality of referable reference pictures.

### Claim 9 (depends on 8)

The non-transitory computer-readable medium according to claim 8, wherein
each of the non-zero values for the plurality of referable reference pictures includes an x-axis offset value and a y-axis offset value.