Ballot scanning

[boredzo]

We probably shouldn't reinvent the wheel and write a whole new ballot-scanner; there may be existing open-source projects that can accurately detect the optical-scan marks, and we should use one of those if possible.

Some voters may have filled in bubbles completely, or made a mark in the bubble but not even partially “filled” the bubble in any sense.

We need two things:

• Scanning the voter ID number (ten columns, one per digit)
• Scanning the candidate selections (as many as 60 on a page)

If necessary, the voter ID number can be represented as a series of 10-candidate “races”, and the “winners” converted into the digits of the ballot's voter ID number in a post-processing step.