OCR itself just converts images of text into text. You're confusing OCR with QR codes, which are intended to make it easy for you to point at them and have your phone go to a specific web site.
QR codes are no more dangerous than going to any random URL (web site), but yeah, a malicious QR code could cause you to go to a web site that tries to break into your (phone / pc / whatever). There are risks in going to any web site, but modern browsers are pretty decent in avoiding "drive by" compromises. And my iPhone (I don't know about Android) will see a QR code but *ask* for permission before it goes to the web site. It's automatic to figure out the URL from the QR code but there's always another step before your phone actually uses that information for anything.
What I'm suggesting for DU is to just save the text of the image with the image and make it available to the search engines. DU is already quite good at stripping out advanced HTML out of people's posts to make this site safe. A simple OCR pass on still images followed by a 'strip HTML' would be fine I think 
p.s. Hi Neighbor! I'm also in Colorado.
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