Making two images represent the same area

I have two microscopy images of cells in two different slides. Each one is taken with different resolution and zoom. What transformation can I do to make sure the two images represent the same two-dimensional area in the original slides? Thanks!

Answer 1

[Image Analyst]

You can try imregister() and imcrop().

[Kasthuri Kannan]

I thought registering two images is usually applied to the same "reference" image, possibly at two different times/out of alignment/in-motion etc. I am not sure if it will apply to two completely different images. There is no reference image here.