Cross-Correlation between two images

 How can I select a random point on one image, then find its corresponding point on another image using cross-correlation?

So basically I have image1, I want to select a point on it (automatically) then find its corresponding/similar point on image2.

Here are some example images:

Full image: 

Patch: 

Result of cross correlation:  

NOTE:-


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Answer: 

Well, xcorr2 can essentially be seen as analyzing all possible shifts in both positive and negative direction and giving a measure for how well they fit with each shift. Therefore for images of size N x N the result must have size (2*N-1) x (2*N-1), where the correlation at index [N, N] would be maximal if the two images where equal or not shifted. If they were shifted by 10 pixels, the maximum correlation would be at [N-10, N] and so on. Therefore you will need to subtract N to get the absolute shift.

With your actual code it would probably be easier to help. But let's look at an example 


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