MATLAB: Cross-Correlation between 2 images

Question

How to select a random POINT on one image than find its corresponding POINT on the other image using cross correlation?

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

Thanks,

Answer 1

You can't do it for a point. Let's say the point in image1 has a value of 100. Well there are lots of points in image2 that might have that value. So you need to look at either the whole image or a window/patch. To look at the whole image and align the two, use imregister(). To look at just a small part of image1 (a template) and find it in image2, use normalized corss correlation, as illustrated in my attached demo.