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US 11,388,418 B2Granted
Video signal processing method and device
AssigneeKt Corporation
InventorBae Keun Lee
Life of this patent
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Abstract
A method of video decoding according to the present invention may comprise determining an intra prediction mode of a current block, determining a DC value using reference samples adjacent to the current block when the intra prediction mode of the current block is a DC mode, and deriving a prediction sample of the current block based on the DC value.
Claims8
A method of decoding a video, the method comprising:
- determining an intra prediction mode of a current block from one or more intra prediction mode candidates;
- and
- obtaining prediction samples of the current block based on the intra prediction mode,
- wherein when the intra prediction mode of the current block is a directional intra prediction mode, each of the prediction samples is derived based on a first reference sample located at a forward direction of the directional intra prediction mode,
- wherein the method further comprises determining whether to extend the intra prediction mode of the current block bi-directionally,
- wherein when it is determined to extend the intra prediction mode of the current block bi-directionally, each of at least one of the prediction samples included in a first region of the current block is modified by using a second reference sample located at an opposite direction of the directional intra prediction mode, and the others of the prediction samples included in a second region of the current block are not modified,
- wherein whether to extend the intra prediction mode of the current block bi-directionally is determined based on whether the intra prediction mode of the current block is included in a range pre-defined in a device for decoding the video, and
- wherein when at least one of a width and a height of the current block is less than a threshold value, the intra prediction mode of the current block is not extended bi-directionally regardless of whether the intra prediction mode of the current block is included in the range or not.
5 more elements
A method of encoding a video, the method comprising:
- deriving a candidate list which including a plurality of intra prediction mode candidates;
- obtaining prediction samples of a current block based on an intra prediction mode of the current block;
- and
- encoding information for an intra prediction mode of a current block based on the candidate list,
- wherein when the intra prediction mode of the current block is a directional intra prediction mode, each of the prediction samples is derived based on a first reference sample located at a forward direction of the directional intra prediction mode,
- wherein the method further comprises determining whether to extend the intra prediction mode of the current block bi-directionally,
- wherein when it is determined to extend the intra prediction mode of the current block bi-directionally, each of at least one of the prediction samples included in a first region of the current block is modified by using a second reference sample located at an opposite direction of the directional intra prediction mode, and the others of the prediction samples included in a second region of the current block are not modified,
- wherein whether to extend the intra prediction mode of the current block bi-directionally is determined based on whether the intra prediction mode of the current block is included in a range pre-defined in a device for encoding the video, and
- wherein when at least one of a width and a height of the current block is less than a threshold value, the intra prediction mode of the current block is not extended bi-directionally regardless of whether the intra prediction mode of the current block is included in the range or not.
6 more elements
A non-transitory computer-readable medium for storing a compressed video data which being generated with program instructions, the compressed video data comprising
- information for an intra prediction mode of a current block, the information indicating one of a plurality of intra prediction mode candidates included in a candidate list,
- wherein when the intra prediction mode of the current block is a directional intra prediction mode, each of prediction samples of the current block is derived based on a first reference sample located at a forward direction of the directional intra prediction mode,
- wherein when it is determined to extend the intra prediction mode of the current block bi-directionally, each of at least one of the prediction samples included in a first region of the current block is modified by using a second reference sample located at an opposite direction of the directional intra prediction mode,
- wherein whether to extend the intra prediction mode of the current block bi-directionally is determined based on whether the intra prediction mode of the current block is included in a range pre-defined in a device for decoding or encoding a video, and
- wherein when at least one of a width and a height of the current block is less than a threshold value, the intra prediction mode of the current block is not extended bi-directionally regardless of whether the intra prediction mode of the current block is included in the range or not.
2 more elements
Dependencies are inferred from the claim text.