How do you compare the two images using MATLAB program

How do you compare the two images using MATLAB program I am on my project retrieve images and you write code comparison between images using correlation, but there is a problem in the code does not give me incorrect results for comparison please help

count=0;
t=0;
x=imread('D:\Image Retrieval\2.bmp');
a=rgb2gray(x);
srcFiles = dir('D:\Image Retrieval\*.bmp');  % the folder in which ur images exists
for i = 1 : length(srcFiles)
  filename = strcat('D:\Image Retrieval\',srcFiles(i).name);
  k = imread(filename);
  count=count+1;
  b=rgb2gray(k);
  c=corr2(a,b);
  if c==1
      imwrite(k,'C:\Users\saba\Desktop\images\image1.jpg');
      t=t+1;
  else 
      disp('tow image are not simalr');
  end
end

[Geoff Hayes]

Jasmine - what results are you getting? What do you expect the results to be? Note that you are comparing the output of corr2 to one which is not always valid especially when using single or double precision numbers. What values of c do you observe?

[Jasmine collar]

I am working on image retrieval system and use the correlation way in the comparison process But when you compare the results must be 100% identical images to know that the twosimaged are similar

[Explorer]

Are you taking same two images as input? If you are doing so, your statement make sense.

You have asked same question here http://www.mathworks.com/matlabcentral/answers/268393-how-do-you-compare-the-two-images-using-matlab-program

Please delete it.

Answer 1

[Nitin Mishra]

I am too working on same project where 5 images of group photos would be given and I need to find out the a person in the image which the user will ask for using a different single image of that particular person.... is there any way then please help me out...