Definitions for "Motion Vector"
A two-component video signal showing the magnitude and direction of moving object displacement over given time interval, e. g. during one TV field. Usually represented in Cartesian co-ordinates, but could equally well be represented in polar notation.
a bi-dimensional pointer that tell the decoder how much left/right and up/down, from the position of the macroblock, is located the prediction macroblock in the reference frame or field
a pointer from a P-block in the current frame to an I- or P-block in the previous frame