Killer-app for wearable-computing? Once a beach-head is secured, can add HUD, games, telephony, movies...
I was concerned that the geometry calculation requires your pupil to be at a precisely known location, but in practice, if it was off, you'd just adjust the sunglasses (and maybe the temples can be made so that you feel their position). You'd calibrate them when you first use them. Of course, the black-spot can be made a little overlarge, for margin of error.
Larry Niven (surely not the only one) mentioned this idea in Grendel (in the Neutron Star collection), a 1968 shortstory, which included [MINOR SPOILER] an update on the old fighter-pilot tactic of attacking out of the sun - which with these sunglasses, is hidden by the black-spot.
I think you'd be surprised what a small variation there would be on pupil location given a mounting point like a nose and a pair of ears. I'm guessing the standard deviation for normal people would be very small, and a fudge factor added to the blackout spot would cover 95% of the population. This could also be also catered for by a range of say, 3 sizes, narrow, wide and normal. George Bush gets a narrow, Uma Thurman gets a wide. It would be a snap to try on each size and work out which one was best.
My comment was mainly about when glasses shift slightly on your face, especially moving down the bridge. For conventional sunglasses, a small change in location has little effect, but for these, even a millimeter could correspond to over 10 pixels (depending on the dpi).
The pane is very close to the eye, so small changes are amplified if lines are extended outward into the scene being viewed.
Actually, to be more accurate, it wouldn't depend on the location of the pupil, but on the center of the eye (because the geometry is that when the eye looks in different directions, it rotates about this center). The pupil moves quite a lot, as you glance left and right.
Yes, you're right. So effectively the black spot is going to be of a sufficient size to create a shaded area over 95% of the area that the pupil is likely to be at any one time.
That's going to be difficult without having internally looking cameras that monitor the pupil.
I don't think that's necessary - when the pupil moves, the whole eyeball rotates, but the light still passes through the center of the eyeball. So we can just that center in our geometry calculations. http://en.wikipedia.org/wiki/Human_eye#Extraocular_muscles
Possibly, we might want to track the pupil size, but it seems reasonable to assume it is always small, since glare is only an issue in bright light. Although, once the glare is hidden, the pupil would dilate slightly, so it's probably best to use that pupil size in the calculations.
If we wanted to cover the whole retina (not just the fovea), we'd need a much bigger blackspot. Actually, the ideal is not to have a sharply delineated spot, but a gradient, corresponding to the sensitivity of retina that it falls upon.
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Killer-app for wearable-computing? Once a beach-head is secured, can add HUD, games, telephony, movies...
I was concerned that the geometry calculation requires your pupil to be at a precisely known location, but in practice, if it was off, you'd just adjust the sunglasses (and maybe the temples can be made so that you feel their position). You'd calibrate them when you first use them. Of course, the black-spot can be made a little overlarge, for margin of error.
Larry Niven (surely not the only one) mentioned this idea in Grendel (in the Neutron Star collection), a 1968 shortstory, which included [MINOR SPOILER] an update on the old fighter-pilot tactic of attacking out of the sun - which with these sunglasses, is hidden by the black-spot.
I think you'd be surprised what a small variation there would be on pupil location given a mounting point like a nose and a pair of ears. I'm guessing the standard deviation for normal people would be very small, and a fudge factor added to the blackout spot would cover 95% of the population. This could also be also catered for by a range of say, 3 sizes, narrow, wide and normal. George Bush gets a narrow, Uma Thurman gets a wide. It would be a snap to try on each size and work out which one was best.
My comment was mainly about when glasses shift slightly on your face, especially moving down the bridge. For conventional sunglasses, a small change in location has little effect, but for these, even a millimeter could correspond to over 10 pixels (depending on the dpi).
The pane is very close to the eye, so small changes are amplified if lines are extended outward into the scene being viewed.
Actually, to be more accurate, it wouldn't depend on the location of the pupil, but on the center of the eye (because the geometry is that when the eye looks in different directions, it rotates about this center). The pupil moves quite a lot, as you glance left and right.
Yes, you're right. So effectively the black spot is going to be of a sufficient size to create a shaded area over 95% of the area that the pupil is likely to be at any one time.
That's going to be difficult without having internally looking cameras that monitor the pupil.
Add a small camera looking inward at the pupil to track it and the shadow of the block.
I don't think that's necessary - when the pupil moves, the whole eyeball rotates, but the light still passes through the center of the eyeball. So we can just that center in our geometry calculations. http://en.wikipedia.org/wiki/Human_eye#Extraocular_muscles
Possibly, we might want to track the pupil size, but it seems reasonable to assume it is always small, since glare is only an issue in bright light. Although, once the glare is hidden, the pupil would dilate slightly, so it's probably best to use that pupil size in the calculations.
If we wanted to cover the whole retina (not just the fovea), we'd need a much bigger blackspot. Actually, the ideal is not to have a sharply delineated spot, but a gradient, corresponding to the sensitivity of retina that it falls upon.