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Optical flow is a concept for estimating the motion of objects within a visual representation. Typically the motion is represented as vectors originating or terminating at pixels in a digital image sequence.
Optical flow is useful in pattern recognition, computer vision, and other image processing applications. It is closely related to motion estimation and motion compensation. Often the term optical flow is used to describe a dense motion field with vectors at each pixel, as opposed to motion estimation or compensation which uses vectors for blocks of pixels, as in video compression methods such as MPEG. Some consider using optical flow for collision avoidance and altitude acquisition system for micro air vehicles (MAVs).
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Some methods for determining optical flow
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