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US 12,587,638 B2Granted
Intra prediction-based video encoding/decoding method and device
AssigneeB1 Institute of Image Technology, Inc.
InventorKi Baek Kim
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Abstract
A video encoding/decoding method and device according to the present invention may: determine a reference area for the intra prediction of the current block; derive the intra prediction mode of the current block; and decode the current block on the basis of the reference area and the intra prediction mode.
Claims8
A method of decoding an image based on an intra prediction with a decoding apparatus, comprising:
- determining an intra prediction mode of a current chroma block;
- and
- predicting the current chroma block based on the intra prediction mode of the current chroma block,
- wherein determining an intra prediction mode of the current chroma block comprises:
- selecting one of a first mode group and a second mode group based on a first flag signaled from the encoding apparatus, the first mode group including only inter-components reference-based prediction modes, the second mode group including 67 intra prediction modes pre-defined in the decoding apparatus, the 67 intra prediction modes being composed of 2 non-directional modes and 65 directional modes, and the first flag specifying whether the intra prediction mode of the chroma block belongs to the first mode group or the second mode group;
- and
- deriving the intra prediction mode of the current chroma block from the selected mode group, and
- wherein the second mode group comprises an intra prediction mode of a current luma block that is corresponding to the current chroma block.
5 more elements
A method of encoding an image based on an intra prediction with an encoding apparatus, comprising:
- determining an intra prediction mode of a current chroma block;
- and
- predicting the current chroma block based on the intra prediction mode of the current chroma block,
- wherein the intra prediction mode of the current chroma block belongs to one of a first mode group and a second mode group, the first mode group including only inter-components reference-based prediction modes, the second mode group including 67 intra prediction modes pre-defined in the encoding apparatus, the 67 intra prediction modes being composed of 2 non-directional modes and 65 directional modes,
- wherein a first flag for specifying whether the intra prediction mode of the current chroma block belongs to the first mode group or the second mode group is encoded and is included in the bitstream,
- wherein the current chroma block is predicted by a current luma block that is corresponding to the current chroma block, when the intra prediction mode of the current chroma block is derived from the first mode group, and
- wherein the second mode group comprises an intra prediction mode of a current luma block that is corresponding to the current chroma block.
4 more elements
A bitstream transmitting method to transmit a bitstream that is generated by encoding an image comprising:
- determining an intra prediction mode of a current chroma block;
- predicting the current block based on the intra prediction mode of the current chroma block;
- obtaining a residual block of the current block based on an original block of the current block and a prediction block of the current block, the prediction block being obtained based on the intra prediction mode;
- generating the bitstream by encoding the residual block of the current block;
- and
- transmitting the generated bitstream,
- wherein the intra prediction mode of the current chroma block belongs to one of a first mode group and a second mode group, the first mode group including only inter-components reference-based prediction modes, the second mode group including 67 intra prediction modes pre-defined in the encoding apparatus, the 67 intra prediction modes being composed of 2 non-directional modes and 65 directional modes,
- wherein a first flag for specifying whether the intra prediction mode of the current chroma block belongs to the first mode group or the second mode group is encoded and is included in the bitstream,
- wherein the current chroma block is predicted by a current luma block that is corresponding to the current chroma block, when the intra prediction mode of the current chroma block is derived from the first mode group,
- wherein the second mode group comprises a DC mode, a planar mode, a vertical mode, and a horizontal mode, and
- wherein the second mode group comprises an intra prediction mode of a current luma block that is corresponding to the current chroma block.
8 more elements
Dependencies are inferred from the claim text.