JPWO2020067700A5

JPWO2020067700A5 -

Info

Publication number: JPWO2020067700A5
Application number: JP2021516609A
Authority: JP
Publication date: 2022-10-04
Anticipated expiration: 2039-09-24

Claims

An image decoding method that performs inter-screen prediction,
constructing a motion candidate list for the target block;
selecting a motion vector from the motion candidate list based on the candidate index ;
deriving an adjusted motion vector based on the motion vector and motion vector adjustment offset information ;
performing inter-prediction of the target block based on the adjusted motion vector ;
The image decoding method, wherein the motion vector adjustment offset information includes information regarding whether a motion vector adjustment offset is added to or subtracted from the motion vector .

2. The image decoding method according to claim 1, wherein said motion vector adjustment offset information includes information regarding an absolute value of said motion vector adjustment offset .

2. The image decoding method of claim 1, wherein the motion vector adjustment offset is applied to one of the x-component of the motion vector or the y-component of the motion vector .

2. The image decoding method of claim 1 , wherein the motion vector adjustment offset is determined differently based on accuracy of the motion vector adjustment offset .

2. The image decoding method according to claim 1, wherein the candidate index indicates a first candidate or a second candidate in the motion candidate list, if the motion candidate list includes multiple candidates.

An image coding method that performs inter-screen prediction,
constructing a motion candidate list for the target block;
selecting a motion vector from the motion candidate list and encoding the motion vector using a candidate index;
deriving an adjusted motion vector based on the motion vector and the motion vector adjustment offset, and encoding the motion vector adjustment offset using motion vector adjustment offset information;
performing inter-prediction of the target block based on the adjusted motion vector;
The image coding method, wherein the motion vector adjustment offset information includes information regarding whether a motion vector adjustment offset is added to or subtracted from the motion vector.

7. The image encoding method according to claim 6, wherein said motion vector adjustment offset information includes information regarding an absolute value of said motion vector adjustment offset.

7. The method of claim 6, wherein the motion vector adjustment offset is applied to one of the x-component of the motion vector or the y-component of the motion vector.

7. The image encoding method of claim 6, wherein the motion vector adjustment offset is determined differently based on the accuracy of the motion vector adjustment offset.

7. The method of claim 6, wherein if the motion candidate list contains multiple candidates, the candidate index indicates the first candidate or the second candidate in the motion candidate list.

A method of transmitting a bitstream generated by an image encoding method, comprising:
The image encoding method comprises:
constructing a motion candidate list for the target block;
selecting a motion vector from the motion candidate list and encoding the motion vector using a candidate index;
deriving an adjusted motion vector based on the motion vector and the motion vector adjustment offset, and encoding the motion vector adjustment offset using motion vector adjustment offset information;
performing inter-prediction of the target block based on the adjusted motion vector;
The method, wherein the motion vector adjustment offset information includes information regarding whether a motion vector adjustment offset is added to or subtracted from the motion vector.