Comparison between 2 images in Frequency domain As you can see there are 2 images from the Tom and Jerry cartoon program.




In the 1st image both Tom and Jerry are present. But in the 2nd one,only Tom is present.Now,we can clearly see this difference in spatial domain. But i want to compare these images in Frequency domain.


So can anybody explain how do we compare these 2 images and find out the missing part from the 2nd image i.e. image of Jerry using Fourier transform ? 
Also,is it possible to find out location  of Jerry in the image using any frequency transform method? If yes can you explain how?
1st question: there are some simple steps to change the spatial domain to freq domain, exp adding some zero to avoid ISI, you can read the procedure from a source book, you can use fft2 command in matlab

2nd question: Surely you can not see the differences in freq domain as clear as spatial domain, because to determine the value of one pixel in freq domain all the pixels in the spatial domain will be effective