Motion vector prediction

1. What is motion vector prediction?
2. What is motion vector?
3. How are motion vectors calculated?
4. What is motion vector difference?

What is motion vector prediction?

264/AVC using motion compensation, motion vector prediction (MVP) refers to motion vectors predicted from the neighboring encoded or decoded blocks. However, if the reference block is encoded in intra prediction mode, the motion vector cannot be acquired because the block has no motion information.

What is motion vector?

motion vector: a two-dimensional vector used for inter prediction that provides an offset from the coordinates in the decoded picture to the coordinates in a reference picture.

How are motion vectors calculated?

A “motion vector” is calculated by finding a correspondence between rectangles at time t, and rectangles at time t − 1, where t is the frame index in a video signal. Motion vectors were originally invented for video coding.

What is motion vector difference?

MMVD provides a compromised solution for the tradeoff between motion vector accuracy and its overhead. MMVD can improve motion vector accuracy by introducing a simplified motion vector representation. The results show that the proposed method improves coding efficiency ofV VC with an average of 0.51% in BD-rate saving.