http://www.kickstarter.com/projects/254 ... ion-sensor
It is designed to store 7 different colors, and can track multiple copies of them at 50hz. They do not comment on lag time. IIt can also see a two color tag then report its location and angle. Kick start supporters can pre-purchase for $60.
One of the questions was about head tracking. They replied;
This product obviously has a potential application in VR for position tracking. I can imagine a system with color tags on top of user's VR helmets who are walking around in an arena. Alternatively, I can imagine a user's computer determining a user's view direction and their location by the camera mounted on the user's VR helmet that looks for colored tags around the room.Facial recognition is a more difficult problem than face detection, so let's just focus on face detection (for now). Pixy will not ship with face detection/tracking functionality, but since we've had such a huge response for this functionality, we're committed to bringing it to you as soon as possible. We're looking at a few possible algorithms. We have experience with Viola-Jones and have seen good results (http://www.cmucam.org/projects/cmucam3/wiki/Viola-jones) But-- yes, expect this to come out before the end of the year!
-Joe Dunfee