Joining images that overlap slightly

I have two images of the same object, one of its top section and another of its lower section. I'd like to join the two images. Problem is, they overlap slightly, and I don't know how to approach this problem. Thanks in advance!

Answer 1

[Image Analyst]

See http://www.cb.uu.se/~cris/blog/index.php/archives/76

and https://www.mathworks.com/help/vision/examples/feature-based-panoramic-image-stitching.html