Automatically extract documents from images and perspectively correct them with classic computer-vision algorithms. In maintenance mode. Check out its successor at:
Deskew is a command line tool for deskewing scanned text documents. It uses Hough transform to detect "text lines" in the image. As an output, you get an image rotated so that the lines are horizontal.
GIMP Scheme (.scm) script for splitting separate sub-images from a composite image that has a uniform background. Creates a new image from each; will call the 'deskew' plugin on each image (if it is installed)
