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 Gwyddion
already? I did notice that the equation in the User Manual for the
Autocorrelation appears to be very similar to the Two point correlation
function that is used in the paper. If not could anyone advise me how I could
go about getting this function into Gwyddion?
Any advice will be gratefully received,
Neil.
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