Inter prediction-based image coding method and device
AssigneeLG Electronics Inc.
InventorsNaeri Park, Junghak Nam, Hyeongmoon Jang
Life of this patent
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Abstract
An image decoding method according to the present document may comprise: a step for deriving an inter prediction mode from encoded information; a step for constructing reference pictures lists; a step for deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) on the basis of reference pictures included in the reference picture lists; and a step for generating prediction samples on the basis of the motion information. The reference picture indices for SMVD may be derived on the basis of short-term reference pictures included in the reference picture lists.
Claims15
An image decoding method performed by a decoding apparatus, the method comprising:
- obtaining image information including prediction related information from a bitstream;
- deriving an inter prediction mode for a current block based on the prediction related information;
- deriving reference picture lists for the current block;
- deriving picture order count (POC) differences between each of reference pictures included in the reference picture lists and current picture;
- deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) based on the POC differences;
- and
- generating predicted samples based on the motion information,
- wherein the reference picture indices for the SMVD are derived based on short-term reference pictures included in the reference picture lists.
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving an inter prediction mode for a current block;
- deriving reference picture lists including reference pictures;
- deriving picture order count (POC) differences between the reference pictures included in the reference picture lists and the current picture;
- deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) based on the POC differences;
- generating predicted samples based on the motion information;
- generating prediction related information including the inter prediction mode;
- deriving residual information based on the predicted samples;
- and
- encoding image information including the prediction related information and the residual information,
- wherein the reference picture indices for SMVD are derived based on short-term reference pictures included in the reference picture lists.
A non-transitory computer readable storage medium storing a bitstream generated by a method, wherein the method comprising:
- deriving an inter prediction mode for a current block;
- deriving reference picture lists including reference pictures;
- deriving picture order count (POC) differences between the reference pictures included in the reference picture lists and the current picture;
- deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) based on the POC differences;
- generating predicted samples based on the motion information;
- generating prediction related information including the inter prediction mode;
- deriving residual information based on the predicted samples;
- and
- encoding image information including the prediction related information and the residual information to output the bitstream,
- wherein the reference picture indices for SMVD are derived based on short-term reference pictures included in the reference picture lists.
Dependencies are inferred from the claim text.