what is var function in matlab?how does it works in image processing?

2013 11 7
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更新时间：2013 11 7
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Image Analyst
Image Analyst 2013-11-7

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V = var(X) returns the variance of X for vectors. For matrices, var(X)is a row vector containing the variance of each column of X.For N-dimensional arrays, var operates along the first non-singleton dimension of X. The result V is an unbiased estimator of the variance of the population from which X is drawn, as long as X consists of independent, identically distributed samples.
It might possibly be used locally in image processing as an edge detector, or to determine the noise or SNR in an image.

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