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Q: 

Number of matches for an ELO Rating system

I'm creating a system that will allow people to rate images.

My idea is to use an ELO Rating system (http://en.wikipedia.org/wiki/Elo_rating_system) for each image and then use crowdsourcing to have people say if an individual image is better than another i.e

Is A better than B

This will be used to updated the ELO rating of A and B, eventually I would end up ranking all the images from supposedly the best to worse.

For this I have two questions

  1. Is this the correct use of ELO or should I be looking at another rating scheme.

  2. If the ELO rating is correct and I have 100 images how many "matches" do I need before I can confidently look at the ranking ?

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