If you're going to offer a service like this, you want a few tiers of verification. You should have a lightning fast level 1 service that returns an automatic response. Perhaps level 2 would be a more computationally expensive automatic response. Level 3 might be human analysis, but the image would be just one of several shown on a screen at once. Level 4 would actually get a human's full attention for a few seconds. And Level 5 would be to handle strange cases, do CP reports and handle disputes.

Yes, such process could be perhaps most optimized, but the most problematic step is step 1.