US 2019/0356922 A1 · INTER-PREDICTION METHOD AND APPARATUS IN IMAGE CODING SYSTEM

Abstract

An image decoding method carried out by a decoding apparatus according to the present invention comprises the steps of: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block on the basis of a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated on the basis of the scaled movement vector and location of the current block; and deriving a movement vector of the current block on the basis of the updated movement vector.

Claims15

Dependent claims

A video decoding method performed by a video decoding apparatus, the method comprising:

deriving a corresponding block corresponding to a current block in current picture, wherein the corresponding block is located in a collocated picture;
deriving a motion vector of the corresponding block;
scaling the motion vector of the corresponding block based on a first temporal distance and a second temporal distance, wherein the first temporal distance is a difference between a picture order count (POC) value of the collocated picture and a POC value of a reference picture of the corresponding block, the second temporal distance is a difference between the POC value of the collocated picture and a POC value of a current picture including the current block;
deriving a modified motion vector based on the scaled motion vector and a position of the current block;
and
deriving a motion vector of the current block based on the modified motion vector.

3 more elements

A decoding apparatus for decoding a video, the decoding apparatus comprising:

an entropy decoding unit configured to receive information indicating a prediction mode of a current block of a current picture;
and
a prediction unit configured to derive a corresponding block corresponding to the current block, derive a motion vector of the corresponding block, scale a motion vector of the corresponding block based on a first temporal distance and a second temporal distance, derive a modified motion vector based on the scaled motion vector and a position of the current block, and derive a motion vector of the current block based on the modified motion vector,
wherein the corresponding block is positioned within a collocated picture,
wherein the first temporal distance is a difference between a picture order count (POC) value of the collocated picture and a POC value of a reference picture of the corresponding block, and
wherein the second temporal distance is a difference between the POC value of the collocated picture and a POC value of the current picture including the current block.

3 more elements

Dependencies are inferred from the claim text.

Inter-prediction method and apparatus in image coding system

Life of this patent

Inter-prediction method and apparatus in image coding system

Life of this patent

Abstract

Claims15