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Smidlee on 05 November 2009
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MaxwellGT2000 said:
Smidlee said:

Head tracking devices can be use to track the hand  as a mouse is a hand tracking device. Thus take Johnny video but instead of using glasses with IR lights just put the IR bar in your hand and Bingo it now tracks your hand without having to aim at the camera. (Unlike the wand you still have to make sure the IR lights is facing the camera)

*shakes head*

You realize that has nothing to do with being accurate right? It's just as accurate in your hand or on your TV... Head tracking helps make the illusion of images popping out of the screen and not a whole lot else.

As far as real accuracy the more points of reference the IR camera has the easier it is to track position.  The sensor bar has 2 points of reference so the IR camera can tell when you're turning upside down, it can also tell how far away the camera is by tracking those two points in reference to the camera. 

On the other hand the PS wand has one IR ball on the top of the wand, the PS eye can track where that is, but its using software to "fake" tracking in a 3D space, basically it tracks it by seeing the item in reference getting bigger (getting closer) and smaller (going away).  It doesn't truly know, if a baloon was deflating in front of it it would think it was moving away.  On top of that there was a head tracking tech demo made for the PS eye, it worked well but not as precise as the head tracking demo Johnny made.

From my understanding PS wand doesn't have a IR ball. Also 2 points of reference can't tell you when you upside down yet it can tell you turning your wii remote. What Johnny was very careful not to show you was if he turn his head slightly toward to left or right of the screen it would zoom out and lean right or left instead of changing the view to the  right or left. That's because it only has two reference points so it can't track 6d movement.

 The reason you can be more accurate with movement the  IR points instead of the camera is exact like you can be more accurate putting a camcorder on a stand and turn the person in view around rather than keeping the person in video still and you walk around the person with the camcorder in hand.

 As far as tracking 6D movement the wand uses motion detection with the ball tracking. (that's the problem with wii-mote it's hard to use both motion detection and IR tracking at the same time since you got to aim with the wii-mote) Just how well this works we have to wait and see.