[shagie]

A lot of distance approximation for humans is done with parallax. (not everyone, I worked with a guy who's brain wouldn't do distance approximation via parallax and so when he went to 3d movies with friends he wore an eyepatch)

If you completely obscure one eye's vision that no longer works and you've lost your depth perception.

Even having one eye blurry is sufficient for parallax to work. (I have very different prescriptions for each eye and if I take my glasses off I can still do distance vision even though one eye can't read any text further away than about 2 feet)

So try it - put an eye patch on for a day and see how many door frames you walk into... or the headache you may get trying to use focusing an eye at different distances (and that's fairly tiring for the lens muscle to be doing all day if it isn't properly exercised).

[skedaddle]

That makes sense. I wonder how these transparent displays handle the focus issues though. If you're not looking at your Monocle/Glasses, maybe 1in in front of your eye, but instead on something hundreds or thousands of times that distance behind it, how does the semitransparent information dense overlay appear at all, let alone in sharp focus?

The "Open source platform" part of the slideshow shows object detection at various distances. If it can box a car 20 feet away, a building 400 yards away, near objects on my breakfast plate, etc., then the plane of projection has to vary over a huge range as you look around (?). In general many of the demos I see seem to have remarkable things going on, in terms of what parts of the UI and world are in focus simultaneously.

[shagie]

Small, high resolution sensors often have a very large depth of field. As an example, if I take a 50mm lens on a full frame 35mm camera at f/8 and I focus at 50 feet away, everything from 25 feet to infinity is in acceptable focus.

While I'm making up some numbers... the sensor for that camera is 3.6mm x 2.7mm. A 5mm lens (that's a made up number) at f/3.5 (that's a guess) would have everything from 5 feet away to infinity be in acceptable focus. If it's a 3mm lens (again, made up number), then everything from 2 feet to infinity is in acceptable focus.

So having the stuff on your plate and the building in the distance both be in focus - yea, that's something reasonable.

But I am still interested in the overlay and how distracting that actually becomes.

[skedaddle]

What you described is how a camera sees the world, and how we see it in pictures. Part of what seems unconvincing to me about these concept ideas is that the demo UIs are superimposed over basically isometric, wide depth of field pictures and video.

So by plane of projection I mean the apparent distance of the virtual image of the UI. If your eyes are focused "through" the display on something a few yards away vs. relatively close, the light from the UI needs to come into your eye (or possibly glasses etc.) as though it is tracing rays in parallel from roughly the same distance away.

Quake style consoles and other HUDs work in video games because in reality the entire scene is coming from the plane of the display, some inches in front of you. If you tried to really focus on a game object 20 yards away, instead of on the screen in front of you, the HUD wouldn't be visible anymore.

In VR optics I believe the virtual screen is something like ~6 feet out in front of you. It is a compromise and still causes eye strain, but is workable perceptually. The issues for transparent AR seem much more complex.

Many of the far-out concepts and ideas that are mocked up for AR seem actually very achievable right now, or yesterday, if the display works like a phone or laptop or VR goggle's does, by re-projecting camera input from a plane a few (possibly virtual) inches or yards away from your eye. The value added though is pretty niche, because people have mobile phones anyway. But if the iPhone hadn't happened, a little display in front of the eye, a whole visor, or a pop-up wrist computer might have been possible to sell. It sounds kind of silly now, but that's what the expectation was in the 80s-90s. The idea of putting a computer on your head still seemed cool then.