hi'
I am mimisha, an m tech student. I am doing my project on image processing. I need to find edge keeping index to measure image quality. can you give me matlab codes for finding edge keeping index?

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 )