From Open Food Facts wiki
- We have a large problem: it's easier to snap pictures than to turn that into text. We thus have a large backlog of products that are not complete. We aim to use clever OCR and techniques, but also Gamification to stay on top.
- Google Image Labeler and Recaptcha are good examples on how to crowdsource that.
- https://en.wikipedia.org/wiki/Google_Image_Labeler
- You basically have players compete to label an image. If they agree on keywords, then the keyword is assumed true and added to the image.