[MartinCron]

I don't want to be a downer, but the last time I looked into OCR it was a real bucket of hurt, and that was on non-hand-drawn images (checking if text rendering worked).

Something less human-readable might be easier to handle (e.g. print out something analogous to a bar code and stick that anywhere on the whiteboard). Tie that bar code to a list of recipients and you're set.