# US 11,122,284 B2 · Picture coding device, picture coding method, and picture coding program, and picture decoding device, picture decoding method, and picture decoding program

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- Number: US 11,122,284 B2
- Document ID: US11122284B2
- Status: Granted
- Kind: B2
- Application number: 17/105,044
- Filed: 2020-11-25
- Published: 2021-03-18
- Granted: 2021-09-14
- Earliest claimed: 2012-03-26
- Assignees: JVCKENWOOD Corporation
- Applicants: JVCKENWOOD Corporation
- Inventors: Toru Kumakura; Shigeru Fukushima
- Web page: https://patentgrep.com/patent/US11122284B2

## CPC

- H04N 19/50: using predictive coding (H04N19/61 takes precedence)
- H04N 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/18: the unit being a set of transform coefficients
- H04N 19/593: involving spatial prediction techniques
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 19/91: Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

In a picture coding device, a significant coefficient information coding controller 706 and an arithmetic encoder 701 code significant difference coefficient information indicating that a difference coefficient value is not zero and significant for each of the difference coefficients in the partial region of the coding target. A difference coefficient value coding controller 707 and the arithmetic encoder 701 code difference coefficient values when significant difference coefficient information is significant for each of pixels in the partial region of the coding target. The significant coefficient information coding controller 706 decides a context for coding the significant difference coefficient information in the partial region of the coding target based on information indicating significance of the difference coefficient in the coded partial region.

## Claims

### Claim 1

A picture decoding device that decodes a bitstream containing difference information between a picture serving as a decoding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the picture decoding device comprising:
a significant sub block information decoding controller that decodes significant sub block information indicating whether all values of difference coefficients of a sub block serving as a decoding target are zero;
a significant difference coefficient information decoding controller that decodes significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
a context deriver that derives a context for decoding the significant difference coefficient information of the difference coefficient serving as the decoding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the decoding target, and countCoeff, which is calculated based on the significant sub block information of decoded sub blocks neighboring to the sub block serving as the decoding target in a difference coefficient area of the plurality of difference coefficient areas serving as the decoding target,
wherein when the countCoeff has a maximum value, the context deriver calculates the context for decoding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the decoding target.

### Claim 2

A picture decoding method that decodes a bitstream containing difference information between a picture serving as a decoding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the picture decoding method comprising:
decoding significant sub block information indicating whether all values of difference coefficients of a sub block serving as a decoding target are zero;
decoding significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
deriving a context for decoding the significant difference coefficient information of the difference coefficient serving as the decoding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the decoding target, and countCoeff, which is calculated based on the significant sub block information of decoded sub blocks neighboring to the sub block serving as the decoding target in a difference coefficient area of the plurality of difference coefficient areas serving as the decoding target,
wherein when the countCoeff has a maximum value, calculating the context for decoding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the decoding target.

### Claim 3

A non-transitory computer-readable recording medium having embodied thereon a picture decoding program decoding a bitstream containing difference information between a picture serving as a decoding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the program comprising:
decoding significant sub block information indicating whether all values of difference coefficients belonging to of a sub block serving as a decoding target are zero;
decoding significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
deriving a context for decoding the significant difference coefficient information of the difference coefficient serving as the decoding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the decoding target, and countCoeff, which is calculated based on the significant sub block information of decoded sub blocks neighboring to the sub block serving as the decoding target in a difference coefficient area of the plurality of difference coefficient areas serving as the decoding target,
wherein when the countCoeff has a maximum value, calculating the context for decoding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the decoding target.

### Claim 4

A picture coding device that codes a bitstream containing difference information between a picture serving as a coding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the picture coding device comprising:
a significant sub block information coding controller that codes significant sub block information indicating whether all values of difference coefficients belonging to of a sub block serving as a coding target are zero;
a significant difference coefficient information coding controller that codes significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
a context deriver that derives a context for coding the significant difference coefficient information of the difference coefficient serving as the coding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the coding target, and countCoeff, which is calculated based on the significant sub block information of coded sub blocks neighboring to the sub block serving as the coding target in a difference coefficient area of the plurality of difference coefficient areas serving as the coding target,
wherein when the countCoeff has a maximum value, the context deriver calculates the context for coding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the coding target.

### Claim 5

A picture coding method that codes a bitstream containing difference information between a picture serving as a coding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the picture coding method comprising:
coding significant sub block information indicating whether all values of difference coefficients belonging to of a sub block serving as a coding target are zero;
coding significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
deriving a context for coding the significant difference coefficient information of the difference coefficient serving as the coding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the coding target, and countCoeff, which is calculated based on the significant sub block information of coded sub blocks neighboring to the sub block serving as the coding target in a difference coefficient area of the plurality of difference coefficient areas serving as the coding target,
wherein when the countCoeff has a maximum value, calculating the context for coding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the coding target.

### Claim 6

A non-transitory computer-readable recording medium having embodied thereon a picture coding program coding a bitstream containing difference information between a picture serving as a coding target and a picture serving as a prediction target, which is partitioned into a plurality of difference coefficient areas and partitioned the plurality of difference coefficient areas into a plurality of sub blocks, the program comprising:
coding significant sub block information indicating whether all values of difference coefficients belonging to of a sub block serving as a coding target are zero;
coding significant difference coefficient information indicating whether a value of a difference coefficient is zero; and
deriving a context for coding the significant difference coefficient information of the difference coefficient serving as the coding target based on a horizontal position and a vertical position of the difference coefficient in the sub block serving as the coding target, and countCoeff, which is calculated based on the significant sub block information of coded sub blocks neighboring to the sub block serving as the coding target in aa difference coefficient area of the plurality of difference coefficient areas serving as the coding target,
wherein when the countCoeff has a maximum value, calculating the context for coding the significant difference coefficient information, regardless of the horizontal position and the vertical position of the difference coefficient in the sub block serving as the coding target.