http://en.wikipedia.org/wiki/Convolution In mathematics and functional analysis, convolution is a mathematical operation on two functions f and g, producing a third function that is typically viewed as a modified version of one of the original functions. Convolution is similar to cross-correlation. It has applications that include statistics, computer vision, image and signal processing, electrical engineering, and differential equations. The convolution can be defined for functions for groups other than Euclidean space. In particular, the circular convolution can be defined for periodic functions, and the discrete convolution can be defined for functions on the set of integers. --

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