hw3_release Extra Credit: Stitching Multiple Images?

[lgqfhwy]

Hello, I am a beginner. In hw3_release Extra Credit: Stitching Multiple Images, I don't know how to do.
The problem said given a sequence of m images, then stitch an ordered chain of images. I want to take the first and second images then stitch together, formed a new images, then stitch together the third images. But it is too complex and maybe have some simple ways.
I notice that you haven't do this problem, if you have any idea, please complete the code. I am a beginner, it is too hard for me. Thank you so much.