do you have the matlab code for finding edge preservation index??

ENL is commonly used to measure the speckle suppression of different SAR image filters. When the ENL value is bigger, it indicates the image is smoothed well.EPI measures the ability to maintain details of the image

function[y] = epi(Io, If)

[a,b] = size(Io);

o=0;
p=0;

for i = 1:a
    for j = 1:b
        if(((i+1)<=a) && ((j+1)<=b))
            r= abs(Io(i,j) - Io(i+1,j));
            t= abs(Io(i,j) - Io(i,j+1));
            l=abs(If(i,j) - If(i+1,j));
            u=abs(If(i,j) - If(i,j+1));
            o = o+ r + t;
            p= p +l+ u;
            r;
            t;
            l;
            u;
            o;
            p;
        end
    end
end

y =(o./p )

my code is this. but it doest working

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags