comarison of N images

suppose I have N images in my single folder let say n1,n2,n3,n4,n5,n6....(images no) i want to compare d images like this n1 and n2-o/p1 n2 and n3-o/p2 n3 and n4-o/p3 n4and n5 - o/p4 so on... al the output store in one location my for loop is not working plzz help me out thnx

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

[Ameer Hamza]

How do you define compare? Do you want to compare pixel values, or do you want to compare if 2 images have same objects in it?

[praveen rai]

i just want general loop code for this after that i wl write..

[Jan]

Please post the code and explain "not working" with any details. It is easier to fix a problem than to guess, what the problem is based only on the expression "not working".

[praveen rai]

data=[2 3 4 5 6 7];
%num=data;
size_data=size(data);
i=1;
temp=0;
for i=1:size_data
      if (data(i) < data(i+1:end))
          temp=data(i+1);
      else
          i=i+1;
      end

end

My code in this is comparing 1st and 2nd elements.

[Stephen23]

@praveen rai: your code seems to have several bugs. For example size(data) returns a 1x2 vector [1,6], which you then use with colon operator as an input to for:

1:size_data

According to the colon help only the first element of non-scalar inputs is used, so your code is equivalent to

1:size_data(1)

which is equivalent to

1:1

which is equivalent to

1

So your loop iterates just once. Also your define a variable i before the loop: this will get ignored because you redefine i to be the loop iterator. Then inside the loop you increment i, but this will be discarded by the for on the next loop iteration.

The if input condition data(i) < data(i+1:end)) will always be true for the sample data. For values not in sequence this might not be true. In any case, regardless of how many times it might be true your code discards all temp allocations except for the very last one, because you did not use any operation to add/store all of the temp values into one value/array.

It is not clear what you are actually trying to do, so I cannot suggest any changes to your code.