hi kghose! it's a multiplayer first person shooter in real life which works thanks to agumented reality. Thank you for your suggestion, we will try to make this more clear!
Every one got is own tag: and camera don't takes the photos, it's in real time in the video streaming :)
about color patch, no, it's not a more robust detection and can generate far more fake positive. It's one year we are working on it in six people, so we know a little about this stuff ;)