Compute the Skewness

Hi everybody,

I have to compute the skewness of an image which formula is:

Skeness = (1/D)^3 * SUM^3( V-MEAN(V) )

where D = Standard Deviation

I have read that I have to compute that on the image histogram.

But I need a skeness value for every pixel (not the pixels of lines in
the border.. I know).
So... I think I can calculte it in a 3x3 (or 5x5 maybe) neighborhood.
Can I do that?
It is calculated from the historgram or from the pixels gray value
inside the neighborhood 5x5?

In other words, can somebody explain me how to calculate the skewness
of an image?

.

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