Method and apparatus for video coding using derivation of intra prediction mode
AssigneesHyundai Motor Company, Kia Corporation, Kwangwoon University Industry-Academic Collaboration Foundation
InventorsJoo Hyung Byeon, Sea Nae Park, Dong Gyu Sim, Seung Wook Park
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for video coding using derivation of intra prediction modes are disclosed. The video coding method and the video coding apparatus derive the intra prediction mode of a current block using pre-restored, neighboring reference sample values and generate a prediction block of the current block based on the derived prediction mode.
Claims19
A method performed by a video decoding apparatus for intra prediction of a current block, the method comprising:
- parsing a prediction mode derivation flag indicating whether to derive a prediction mode of the current block from a bitstream;
- and
- checking the prediction mode derivation flag,
- wherein, when the prediction mode derivation flag is true, the method includes:
- determining a calculation area used for calculating gradient values from restored neighboring samples of the current block;
- calculating a gradient histogram of directional modes in the calculation area for the current block;
- deriving a prediction mode of the current block based on the gradient histogram;
- and
- generating a prediction block of the current block by performing intra prediction using the derived prediction mode.
A method performed by a video encoding apparatus for intra prediction of a current block, the method comprising:
- obtaining a prediction mode derivation flag indicating whether to derive a prediction mode of the current block;
- and
- checking the prediction mode derivation flag,
- wherein, when the prediction mode derivation flag is true, the method includes:
- determining a calculation area used for calculating gradient values from restored neighboring samples of the current block;
- calculating a gradient histogram of directional modes in the calculation area for the current block;
- deriving a prediction mode of the current block based on the gradient histogram;
- and
- generating a prediction block of the current block by performing intra prediction using the derived prediction mode.
A computer-readable recording medium storing a bitstream generated by a video encoding method for intra predicting a current block, wherein the method comprising:
- obtaining a prediction mode derivation flag indicating whether to derive a prediction mode of the current block;
- and
- checking the prediction mode derivation flag,
- wherein, when the prediction mode derivation flag is true, the method includes:
- determining a calculation area used for calculating gradient values from restored neighboring samples of the current block;
- calculating a gradient histogram of directional modes in the calculation area for the current block;
- deriving a prediction mode of the current block based on the gradient histogram;
- and
- generating a prediction block of the current block by performing intra prediction using the derived prediction mode.
Dependencies are inferred from the claim text.