You may also find this useful, as you are working with a Linux OS:
https://www.imagemagick.org/Usage/crop/
Imagemagick is a very versatile tool for doing repetitive operations on
images. In your use case, it would be possible to run the program
twice, to save cropped copies of the right half of every image, then
save copies of the left half of every image.
Determining the exact commands to use takes a little digging in the
documentation, but that's way easier than learning Scheme (or so I
imagine, not having learned Scheme myself).
If your scans don't need tweaking, and your target output is a PDF
document, Imagemagick covers that in one operation:
http://www.binarytides.com/convert-pdf-image-imagemagick-commandline/
:o)
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