On 3/22/2012 11:45 AM Khalid Al-Ghamdi said...
Hi All,
I work in in academic testing environment and we employ expensive
machines to scan answer sheets (the ones where you blacken the letter of
the correct multiple choice answer). Anyway, I was thinking if there was
a way we could use regular old scanners to scan the sheets than analyze
the images to score the tests.
Do you know any modules or libraries in python that can be helpful in
that? Also, what approach if any would you employ to tackle this project?
For quick production deployment, I'd check out Bob's suggestion.
If I were going to write a python based solution I'd start with PIL (see
http://www.pythonware.com/products/pil/)
I haven't tried doing something quite as detailed as what you're
describing, but I do have PIL doing image analysis, cropping and
resizing on an automated basis in a production environment.
I think I'd examine the scanned image for a location marker, then from
that and an answer template that provides the answer box locations,
locate the answer box area for each question in turn and identify the
filled in multiple choice response.
HTH,
Emile
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