Image decoding method and apparatus therefor
AssigneeLG Electronics Inc.
InventorsSunmi YOO, Junghak NAM, Jaehyun LIM, Naeri PARK, Jangwon CHOI
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Abstract
An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of a current block; scaling neighboring samples for the current block so as to derive modified neighboring reference samples for the current block; deriving prediction samples for the current block on the basis of the intra prediction mode and the modified neighboring reference samples; deriving a reconstructed block for the current block on the basis of the prediction samples; and upscaling the reconstructed block so as to derive a modified reconstructed block.
Claims15
A method for an image decoding, the method performed by a decoding apparatus and comprising:
- deriving an intra prediction mode of a current block;
- deriving modified neighboring reference samples for the current block by scaling neighboring samples for the current block;
- deriving prediction samples for the current block based on the intra prediction mode and the modified neighboring reference samples;
- deriving a reconstructed block for the current block based on the prediction samples;
- and
- deriving a modified reconstructed block by upscaling the reconstructed block.
A method for an image encoding, the method performed by an encoding apparatus and comprising:
- deriving a modified current block by scaling a current block;
- deriving an intra prediction mode of the modified current block;
- deriving modified neighboring reference samples for the modified current block by scaling neighboring samples for the modified current block;
- deriving prediction samples for the modified current block based on the intra prediction mode and the modified neighboring reference samples;
- encoding image information including intra prediction related information for the modified current block;
- and
- generating a bitstream including the image information.
A computer-readable digital storage medium which stores a bitstream generated by a specific method, wherein the specific method comprises:
- deriving a modified current block by scaling a current block;
- deriving an intra prediction mode of the modified current block;
- deriving modified neighboring reference samples for the modified current block by scaling neighboring samples for the modified current block;
- deriving prediction samples for the modified current block based on the intra prediction mode and the modified neighboring reference samples;
- encoding image information including intra prediction related information for the modified current block;
- and
- generating the bitstream including the image information.
Dependencies are inferred from the claim text.