# US 2018/0324422 A1 · Image predictive encoding and decoding device

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

- Number: US 2018/0324422 A1
- Document ID: US20180324422A1
- Status: Published application
- Kind: A1
- Application number: 16/032,988
- Filed: 2018-07-11
- Published: 2018-11-08
- Earliest claimed: 2009-03-23
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yoshinori SUZUKI; Choong Seng BOON
- Web page: https://patentgrep.com/patent/US20180324422A1

## CPC

- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- 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 19/136: Incoming video signal characteristics or properties
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/196: being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters (processing of motion vectors H04N19/513)
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 19/593: involving spatial prediction techniques
- H04N 19/109: among a plurality of temporal predictive coding modes
- H04N 19/11: among a plurality of spatial predictive coding modes
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image predictive encoding device can efficiently encode an image, while suppressing an increase in prediction information and reducing the prediction error of a target block. In an image predictive encoding device, according to one embodiment, to produce a prediction signal of a partition in a target region, it is decided whether prediction information of a neighbouring region can be used. When prediction information of the neighbouring region can be used, a region width of the partition where the prediction information of the neighbouring region is used to produce the prediction signal is determined. The prediction signal of the target region is produced from a reconstructed signal based on at least one of the region width, the prediction information of the target region, and the prediction information of the neighbouring region. The prediction information, information identifying the region width, and a residual signal are encoded.

## Claims

### Claim 1

An image predictive decoding method for an image predictive decoding device, the method comprising:
a first step for extracting, from compressed data where an image is divided into a plurality of regions and encoded, encoded data of identifying information that specifies a region to be used in producing a prediction signal of a target region, and encoded data of a residual signal;
a second step for specifying a neighbouring region from a plurality of neighbouring region candidates neighbouring the target region based on identification information decoded from the encoded data of the identification information, and producing a prediction signal of the target region from a reconstructed signal by using mode information specifying inter-picture prediction, a reference picture number, and a motion vector, all of which are prediction information associated with the neighbouring region specified;
a third step for restoring a reproduction residual signal of the target region from the encoded data of the residual signal;
a fourth step for producing a reproduction signal of the target region based on the prediction signal of the target region and the reproduction residual signal; and
a fifth step for storing the reproduction signal of the target region as the reconstructed signal,
wherein the second step includes
determining availability of prediction information associated with a neighbouring region on the left of the target region and availability of prediction information associated with a neighbouring region above the target region, and
adopting the neighbouring region on the left and the neighbouring region above as the plurality of neighbouring region candidates if the prediction information associated with each of the neighbouring region on the left and the neighbouring region above are determined as having availability for producing the prediction signal of the target region.

### Claim 2

An image predictive decoding method for an image predictive decoding device, the method comprising:
a first step for extracting, from compressed data where an image is divided into a plurality of regions and encoded, encoded data of identification information that specifies a region to be used in producing a prediction signal of a target region, and encoded data of a residual signal;
a second step for specifying a neighbouring region from a plurality of neighbouring region candidates neighbouring the target region based on identification information decoded from the encoded data of the identification information, and producing a prediction signal of the target region from a reconstructed signal by using mode information specifying inter-picture prediction, a reference picture number, and a motion vector, all of which are prediction information associated with the neighbouring region specified;
a third step for restoring a reproduction residual signal of the target region from the encoded data of the residual signal;
a fourth step for producing a reproduction signal of the target region based on the prediction signal of the target region and the reproduction residual signal; and
a fifth step for storing the reproduction signal of the target region as the reconstructed signal,
wherein the second step includes
determining availability of prediction information associated with each of a neighbouring region on the left and a neighbouring region above being the plurality of neighbouring region candidates, and
determining the availability of the prediction information associated with the neighbouring region possessing prediction information identical to the prediction information associated with the target region as being unavailable among from the plurality of neighbouring region candidates.