Although the image recognition software is cool, it's almost surely cheaper to just set up Mechanical Turk HITs, compared to however many programmer-hours were spent on the image recognition.
Well, I'm not an expert by an means but I think the plumbing would take far more time than the vision itself - hooking up to a calender api, etc. Maybe MT would run into the same issues. But HITs are super cheap, and a single programmer-day in many countries would still buy a ton of HITs at a few cents a pop.
