opencv - multiple choice test mark reader - where to start? - Stack Overflow
GitHub - ylemkimon/formscanner: FormScanner is an OMR (Optical Mark Recognition) software that automatically marks multiple-choice papers. Forked 1.1 from https://sourceforge.net/projects/formscanner/ (http://www.formscanner.org/)
Solved In millimeters, what is the diameter of the scanning | Chegg.com
4 Steps to Evaluate OMR Answer Sheet | Teaching methodology, Evaluation, Study plan
Canon Knowledge Base - IJ Scan Utility Lite - Scanning Multiple Documents at One Time from the ADF (Auto Document Feeder) - TR8620