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US 10,873,759 B2Granted
Data encoding and decoding
AssigneeSony Corporation
InventorsKarl James Sharman, James Alexander Gamei
Life of this patent
Estimating the term…
Abstract
A method encoding image data including: encoding the image data by an inter-image predictor in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate block positions in a reference image; and selectively applying a constrained inter-image prediction mode in which, in comparison to an inter-image prediction mode for the encoding, one or both of the number of candidate block positions and the number of candidate reference images is reduced.
Claims20
A method of encoding image data comprising:
- encoding first portions of the image data to be included in a data stream of encoded image data by applying an inter-image prediction mode to the first portions of the image data in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate reference block positions in a reference image of a number of candidate reference images;
- encoding second portions of the image data to be included in the data stream of encoded image data by applying a constrained inter-image prediction mode to the second portions of the image data in which, in comparison to the inter-image prediction mode, the number of candidate reference images is reduced while still predicting the block in the current image from the reference block in the reference image, and a motion vector is constrained to an integer value in the constrained inter-image prediction mode;
- and
- setting, in the data stream of encoded image data, a flag indicating the second portions of the image data to which the constrained inter-image prediction mode is applied.
1 more element
A method of decoding image data, comprising:
- decoding, from a data stream of encoded image data, first portions of the image data by applying an inter-image prediction mode to the first portions of the image data in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate reference block positions in a reference image of a number of candidate reference images;
- obtaining, from the data stream of encoded image data, a flag indicating second portions of the image data to which a constrained inter-image prediction mode is applied;
- and
- decoding, from the data stream of encoded image data, the second portions of the image data as indicated by the flag by applying the constrained inter-image prediction mode to the second portions of the image data in which, in comparison to the inter-image prediction mode, the number of candidate reference images is reduced while still predicting the block in the current image from the reference block in the reference image, and a motion vector is constrained to an integer value in the constrained inter-image prediction mode.
1 more element
A data encoding apparatus comprising:
- circuitry configured to
- encode first portions of image data to be included in a data stream of encoded image data by applying an inter-image prediction mode to the first portions of the image data in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate reference block positions in a reference image of a number of candidate reference images;
- encode second portions of the image data to be included in the data stream of encoded image data by applying a constrained inter-image prediction mode to the second portions of the image data in which, in comparison to the inter-image prediction mode, the number of candidate reference images is reduced while still predicting the block in the current image from the reference block in the reference image, and a motion vector is constrained to an integer value in the constrained inter-image prediction mode;
- and
- set, in the data stream of encoded image data, a flag indicating the second portions of the image data to which the constrained inter-image prediction mode is applied.
2 more elements
A data decoding apparatus comprising:
- circuitry configured to
- decode, from a data stream of encoded image data, first portions of image data by applying an inter-image prediction mode to the first portions of the image data in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate reference block positions in a reference image of a number of candidate reference images;
- obtain, from the data stream of encoded image data, a flag indicating second portions of the image data to which a constrained inter-image prediction mode is applied;
- and
- decode, from the data stream of encoded image data, the second portions of the image data as indicated by the flag by applying the constrained inter-image prediction mode to the second portions of the image data in which, in comparison to the inter-image prediction mode, the number of candidate reference images is reduced while still predicting the block in the current image from the reference block in the reference image, and a motion vector is constrained to an integer value in the constrained inter-image prediction mode.
2 more elements
Dependencies are inferred from the claim text.