Calaculation of Interridge distance for fingerprint image

**broken link removed**

In the above link before process 1 step he has taken D=6,i searched for how to find D value but when i wrote some sample code it is giving values 2.22... something .Can you correct my code and give me correct process.Thanks in advance.
I have one doubt about interridegedistance parameter that will be used for false minutiae

removal in fingerptin images comparison.In one document i found that it is calaculated using the procedure given here,we

first calculate the inter ridge distance D which is the average distance between two neighboring ridges. For this scan

each row to calculate the inter ridge distance using the formula:
Inter ridge distance = sum all pixels with values 1/row length.
Finally an averaged value over all rows gives D. .for the above process we are considering the image obtained after

Thinning operation.Can you give the matlab code for it.otherwise i have written some code can you please check it once....
BElow is the code which i have written::
clc;
clear all;
close all;
y=ones(3);
y=[1 1 1; 1 1 1; 0 0 0 ];
[m,n]=size;
avgrowsum=0;
finalavgrowsum=0;
k=0;
for r=1:m
rowsum=0;
for c=1:n
if (y(r,c)>0)
rowsum=rowsum+y(r,c);
disp(rowsum)
avgrowsum = (m/rowsum);
disp(avgrowsum)
end

end


if (avgrowsum > 0)
finalavgrowsum=avgrowsum+finalavgrowsum;
k=k+1;
disp(finalavgrowsum)
end

end
disp(finalavgrowsum)
disp(k)
ffinalavgrowsum= (finalavgrowsum/k);
disp(ffinalavgrowsum)

Thanks in advance.

Regards,
GANESH

If anyone have the code of fingerprint ridge distance computation kindly email me on tariq045@gmail.com. I badly need this code. Thanks in advance