Every time someone uses the service, they spend 30 seconds rating other people's images. There can be a countdown (i.e. rate 10 more to see your results).
It would also be important to make it very fast. Cache all the images before the voter gets there, and send the results asynchronously so they don't need to wait. One could easily do a rating in less than a second. It's all snap judgements.
It would also be important to make it very fast. Cache all the images before the voter gets there, and send the results asynchronously so they don't need to wait. One could easily do a rating in less than a second. It's all snap judgements.