Calculating specific surface area of 2D image

Posted by Neil Bishop on Oct 25, 2010; 2:45pm
URL: http://imagej.273.s1.nabble.com/Calculating-specific-surface-area-of-2D-image-tp3686537.html

Hi,
We have come across a paper where the authors calculate the permeability of a rock sample from a 2D backscattered SEM image. In order to do this they calculate Specific Surface Area using a binary image (rock is black, pores are white). To do this they first calculate a two-point correlation function. Apparantly this is the probability that two points separated by a line (r) are both in the pore space. Firstly in a Cartesian Coordinate system. They then convert this to a Polar Coordinate system. Then from this they calculate the Specific Surface Area.
 
I should probably mention that the two-point correlations equations that they are using in this paper are a little bit beyond me, so if you would like to look at the paper for yourself you can download it from here. The equations in question are 9, 10 and 12 on pages 3-4.
 
According to the paper they have done these calculations using a function that is written in MATLAB. I just wondered if such a function existed in ImageJ already? I have downloaded and installed the ImageJ for Microscopy version and I have been through all the menus, but nothing seems to obviously be it. If not could anyone advise me how I could go about getting this function into ImageJ?
 
Any advice will be gratefully received,
Neil.