Motion Vector
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Motion Vector
Visualized motion vectors. The foreground character's rotating downward head movement is visible, as well as the background character's slower upward head movement.

In video compression, a motion vector is the key element in the motion estimation process. It is used to represent a macroblock in a picture based on the position of this macroblock (or a similar one) in another picture, called the reference picture.

The H.264/MPEG-4 AVC standard defines motion vector as:

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.[1][2]

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