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 mode information and residual information from a bitstream;
- determining a prediction mode for a current block as an interprediction mode using a symmetric motion vector differences (SMVD) based on the prediction mode information;
- deriving reference picture lists including L0 and L1 for the current block;
- deriving picture order count (POC) differences between each of reference pictures and a current picture, for each of the L0 and the L1;
- deriving motion information including a reference picture index for each of the L0 and the L1 based on the POC differences;
- generating predicted samples of the current block based on the motion information;
- generating residual samples of the current block based on the residual information;
- and
- generating reconstructed samples of the current block based on the predicted samples and the residual samples,
- wherein the reference picture index for the L0 is derived based on a short-term reference picture included in the L0, and
- wherein the reference picture index for the L1 is derived based on a short-term reference picture included in the L1.
An image encoding method performed by an encoding apparatus, the method comprising:
- determining a prediction mode for a current block as an inter prediction mode using a symmetric motion vector differences (SMVD);
- deriving reference picture lists including L0 and L1 for the current block;
- deriving picture order count (POC) differences between each of reference pictures and a current picture, for each of the L0 and the L1;
- deriving motion information including a reference picture index for each of the L0 and the L1 based on the POC differences;
- deriving predicted samples of the current block based on the motion information;
- generating prediction mode information related to the SMVD;
- deriving residual samples of the current block based on the predicted samples;
- generating residual information related to the residual samples;
- and
- encoding image information including the prediction mode information and the residual information,
- wherein the reference picture index for the L0 is derived based on a short-term reference picture included in the L0, and
- wherein the reference picture index for the L1 is derived based on a short-term reference picture included in the L1.
A non-transitory computer readable storage medium storing a bitstream generated by a method, wherein the method comprising:
- determining a prediction mode for a current block as a symmetric motion vector differences (SMVD);
- deriving reference picture lists including L0 and L1 for the current block;
- deriving picture order count (POC) differences between each of reference pictures and a current picture, for each of the L0 and the L1;
- deriving motion information including a reference picture index for each of the L0 and the L1 based on the POC differences;
- deriving predicted samples of the current block based on the motion information;
- generating prediction mode information related to the SMVD;
- deriving residual samples of the current block based on the predicted samples;
- generating residual information related to the residual samples;
- and
- encoding image information including the prediction mode information and the residual information to output the bitstream,
- wherein the reference picture index for the L0 is derived based on a short-term reference picture included in the L0, and
- wherein the reference picture index for the L1 is derived based on a short-term reference picture included in the L1.
Dependencies are inferred from the claim text.