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Definition of "motion vector" |
a vector displacement representing the translation of a pixel, block, or region between two frames of video, usually determined by optical flowcalculation or block matching (see motion estimation). For instance, in the case of dense motion field, say, an optical flow field, a motion vector is assigned to each pixel on the image plane. In the case of block matching for image coding, a motion vector is assigned to each block. In the case of computer vision, a motion vector sometimes refers to the velocity of a point or an object in the 3-D space. Sometimes motion vectors are referred to as displacement vectors. |
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