Author Topic: about headtracking  (Read 13631 times)

Offline troy59

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Reply #15 on: January 21, 2008, 09:25:07 PM
I know ir leds' are pretty safe, its just you don't want to use a laser pointer even if you could



Offline pini

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Reply #16 on: February 09, 2008, 04:49:36 PM
Regarding the safety issue:
There is A LOT of near IR light in regular sun light - so I think our eyes are well equipped to handle that part of the spectrum.
A sunny day has much more IR light than a LED array in an indoor environment...

On top of that, I know of a number of car manufacturers (big ones) who are working on integrating driver's eye detection for safety application in their vehicles (identifying that a driver is drowsy). They use active IR LEDs to illuminate the drivers face and eyes, and from what I understood it is safe for the eyes (if not they should expect major lawsuits...)

I work in computer vision and have experience with active IR illumination - and I think that the major issue here would be the "noise" coming from reflections on the face and other surfaces. reflected light tends to reduce in intensity much faster / closer than illuminated light, so in order to get a reliable signal the sensitivity of the camera would have to be increased - introducing more reflections from other surfaces.

It might work, but it's not a given thing...