how to convert an image to topography image?

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may
may 2011-5-14
I have a 2D C.T image. I would like (in some way) to calculate roughness of the image. I need to translate each pixel to its height and later to calculate the variance. It's important to mention that I don't have the height information for each pixel.

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Sean de Wolski
Sean de Wolski 2011-5-16
To calculate the variance, take the square of the output of stdfilt
doc stdfilt

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