Surface analysis (Roughness and peak points)using 2D array

I am having a 2D array of complex numbers as a result of some kind of transformation of an original image. I need to find surface characteristics like roughness, peak points from these values. How is it possible? Can anyone suggest a method or somethin like that?
thnx
Nghtcwrlr
********************Kudos are alwayzz Welcome !! ******************

Hello Bernd
I am using LabVIEW 8.2. I have already seen the algorith to detect edges using convolution. But i need to find some kind of property between fourier coefficient and high edges. I would rather like not to use any development modules like Vision Development Module .
Thnxx
Nghtcwrlr
********************Kudos are alwayzz Welcome !! ******************

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