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.
- ^ Latest working draft of H.264/MPEG-4 AVC Archived 2004-07-23 at the Wayback Machine.. Retrieved on 2008-02-29.
- ^ Latest working draft of H.264/MPEG-4 AVC on hhi.fraunhofer.de.
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