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US 2022/0103830 A1Published application
Method and device for image coding using motion vector
AssigneeLG Electronics Inc.
InventorsNaeri PARK, Junghak Nam, Hyeongmoon Jang
Life of this patent
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Abstract
According to embodiments of the present document, symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction mode may be performed on the basis of reference picture types and, particularly, short term reference pictures may be used. Therefore, prediction performance and coding efficiency in the inter prediction mode can be improved.
Claims17
An image decoding method performed by a decoding apparatus, the method comprising:
- receiving image information including prediction related information and residual information from a bitstream;
- deriving an inter prediction mode based on the prediction related information;
- deriving motion information based on the inter prediction mode;
- generating predicted samples based on the motion information;
- generating residual samples based on the residual information;
- and
- generating reconstructed samples of a current picture based on the predicted samples and the residual samples,
- wherein the prediction related information includes inter prediction type information specifying whether bi-prediction is applied to a block of the current picture,
- wherein the prediction related information further includes symmetric motion vector differences (SMVD) flag information specifying whether SMVD is applied, based on the inter prediction type information,
- wherein at least one reference picture index among the reference picture indices indicating short-term reference pictures is used for derivation of the motion information based on the SMVD flag information.
7 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving an inter prediction mode for a current block within a current picture;
- deriving reference pictures for the inter prediction mode;
- deriving motion information for prediction of the current block based on the inter prediction mode;
- generating predicted samples based on the motion information;
- generating prediction related information including the intra prediction mode;
- generating residual information based on the predicted samples;
- and
- encoding image information including the prediction related information and the residual information,
- wherein the prediction related information includes inter prediction type information specifying whether bi-prediction is applied to the current block of the current picture,
- wherein the prediction related information further includes symmetric motion vector differences (SMVD) flag information specifying whether SMVD is applied, based on the inter prediction type information,
- wherein the reference pictures include short-term reference pictures,
- wherein at least one reference picture index among the reference picture indices indicating short-term reference pictures is used for derivation of the motion information based on the SMVD flag information.
9 more elements
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 within a current picture;
- deriving reference pictures for the inter prediction mode;
- deriving motion information for prediction of the current block based on the inter prediction mode;
- generating predicted samples based on the motion information;
- generating prediction related information including the intra prediction mode;
- generating 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 prediction related information includes inter prediction type information specifying whether bi-prediction is applied to the current block of the current picture,
- wherein the prediction related information further includes symmetric motion vector differences (SMVD) flag information specifying whether SMVD is applied, based on the inter prediction type information,
- wherein the reference pictures include short-term reference pictures,
- wherein at least one reference picture index among the reference picture indices indicating short-term reference pictures is used for derivation of the motion information based on the SMVD flag information.
9 more elements
Dependencies are inferred from the claim text.