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I have obtained this from Wikipedia about the application of Earth Movers Distance to pattern recognition. Can anybody explain the concept of signature used in this Wikipedia article. Thanks.

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A set of clusters. Each cluster is represented by a pair with (1) one single point (usually the center in the cluster) ,and (2) a weight coefficient that usually in proportional to the size of the corresponding cluster. Note that the point can be anything including the coordinates of the pixel, the color information, intensity...etc.

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