I am currently working on a project in which I need to check the similarity between images... I have started of trying the cosine similarity.. the formula available online needed to be modified since it was only for text and in images the 1st pixel of one image will have to be checked with every pixel of the next. I tried the following code in matlab but it gives no output.. i have no idea if i am even remotely correct..

```
x1=imread('C:\Program Files\MATLAB\R2009a\image classes\flowers\f1.jpg');
x2=imread('C:\Program Files\MATLAB\R2009a\image classes\flowers\f2.jpg');
%[m1 n1]=size(x1);
%[m2 n2]=size(x2);
for i=1:256
for j=1:256
if(x1(i,j)==0)
x1(i,j)=1;
end
if(x2(i,j)==0)
x2(i,j)=1;
end
end
end
y1=0;
y2=0;
y3=0;
for i=1:256
for k=1:256
z1=x1(i,k);
for j=1:256
for l=1:256
y1=y1+z1*x2(j,l);
end
end
end
end
for i=1:256
for j=1:256
y2=y2+x1(i,j)*x1(i,j);
end
end
for i=1:256
for j=1:256
y3=y3+x2(i,j)*x2(i,j);
end
end
sim=y1/(y2*y3);
[m n]=size(sim);
imshow(sim);
display(sim);
```