Robin Burgener wrote: > Tracking the eye with a camera is an interesting idea but it might > interfere with the head-mounted display. What if you could project an > IR grid or dot pattern on the eye then use a IR CCD camera to pick-up > the image; You should be able to see a distortion in the pattern > caused by the bulge of the cornea. As an added bonus, it should be > possible to measure the curvature of the cornea to calculate the eye's > focal length. So that it wouldn't interfere with the HMD, an optical > splitter could combine/split the images. At the risk of sounding practical, don't many high-end auto focus SLR cameras use something of this sort for determining where in the frame to focus? The few that I have used had very limited "zones" of focus, so it might not be applicable for a real input device. I don't have any info on how the tech works. On another note, SLR cameras are a good example of a "simple" HUD. In the same manner as wristwatches are the first wearables, SLR viewfinders are somewhere between augmented and mediated displays. In addition to being able to zoom and adjust focal depth, they usually have displays on the side of the dispay to relay camera information and a few have transparent LCD's on the ground glass prism. Still waiting on my micro LCD's from Halted Electronics... Tramm -- o
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