Reverse Projector: New Tech for Immersive Video Experience

[Arceus]

Good morning physicists, I have a small problem, having a sony projector, like all projectors I always have the usual problem of image pollution. I heard a few months ago (but now I can no longer find the link), of a new technology according to which the projector instead of projecting on the panel, in front of me, projects the video directly into my eyes.

In the link of the description you could see a boy who tried it and it was like a narrow beam of light, then the inventor made us understand that when it was pointed in our eyes, we only see what is projected and not the objects that are around us we therefore manage to take our entire field of vision, this idea of occupying the entire field of vision and not looking at anything that surrounds us but only the video of the projector fascinates me a lot.

Unfortunately I no longer have the link, but the inventor was a amateur who exploited a known physical principle, do you know anything about it?

 

[Drakkith]

You're describing VR goggles, basically. They project images directly into the eye and not on an intermediate surface for the eye to then view.

we only see what is projected and not the objects that are around us we therefore manage to take our entire field of vision, this idea of occupying the entire field of vision and not looking at anything that surrounds us but only the video of the projector fascinates me a lot, unfortunately I no longer have the link, but the inventor was a amateur who exploited a known physical principle, do you know anything about it?

This isn't possible except by physically blocking/misdirecting the unwanted light, which VR goggles do by entirely enclosing the user's eyes. You can take away most of the sides of the goggles, but then environmental light get in and reduces the contrast of the projected image.

 

[berkeman]

I have a small problem, having a sony projector, like all projectors I always have the usual problem of image pollution.

Sorry, what is "image pollution"?

 

[Baluncore]

Sorry, what is "image pollution"?

Reduction of the contrast and the loss of true black.
Contamination of the projected image by stray light from other sources.
https://en.wikipedia.org/wiki/Light_pollution

 

[berkeman]

Reduction of the contrast and the loss of true black.
Contamination of the projected image by stray light from other sources.
https://en.wikipedia.org/wiki/Light_pollution

But why are those not easily fixable? Why does there need to be some amazing technical fix for stray light leaking in a window?

 

[Arceus]

You're describing VR goggles, basically. They project images directly into the eye and not on an intermediate surface for the eye to then view.This isn't possible except by physically blocking/misdirecting the unwanted light, which VR goggles do by entirely enclosing the user's eyes. You can take away most of the sides of the goggles, but then environmental light get in and reduces the contrast of the projected image.

yes this is what I mean just like glasses do, but ip i want to do it with a projector at a distance of 2 meters, some experts have told me that it is possible using the concept of focal point and for the eye it is 7mm, and to keep the eye still. Basically what I want is that I can only see what the projector shows me and not what surrounds me because it would not make me concentrate.

 

[Arceus]

Sorry, what is "image pollution"?

oh sorry (it's a translation) I mean objects that are close to the image of the projector, such as a chair or the floor and do not make me concentrate on the projection of the video that's why I ask if it can be projected in the eye and not see nothing else, but only what the projector throws at me, thus occupying my entire field of vision

 

[berkeman]

oh sorry (it's a translation) I mean objects that are close to the image of the projector, such as a chair or the floor and do not make me concentrate on the projection of the video that's why I ask if it can be projected in the eye and not see nothing else, but only what the projector throws at me, thus occupying my entire field of vision

Why don't you just watch the material on your laptop in a darkened room? There is no need for some high-tech solution here, IMO.

 

[Arceus]

Reduction of the contrast and the loss of true black.
Contamination of the projected image by stray light from other sources.
https://en.wikipedia.org/wiki/Light_pollution

I don't know if you mean the image quality of the projector, but I am not referring to that but to the objects that are around the image that I want to eliminate, so projecting the image directly into my eye and occupying the whole field of view I can only see the image of the projector and not other objects in the room. in fact, the light diffused by the other objects is bothersome

 

[Arceus]

Why don't you just watch the material on your laptop in a darkened room? There is no need for some high-tech solution here, IMO.

yes sir I tried but since the image of the laptop is not a beam, it happens that even if in a dark room I see the pc screen with the images and all the black of the room around with some diffused light in the around due to the spread of my white face. instead I would like it to occupy my entire field of vision just like the VR glasses, but the glasses are close, instead I at a distance of 2 m with a projector

 

[berkeman]

yes sir I tried but since the image of the laptop is not a beam, it happens that even if in a dark room I see the pc screen with the images and all the black of the room around with some diffused light in the around due to the spread of my white face.

Speaking as a Medic (my part-time job) -- Have you spoken with your family doctor about these issues? There are likely some ways that your doctor can help you get beyond these difficulties.

Speaking as a display engineer who has worked with Head-Up Displays (HUDs) and devices similar to Google Glass, I don't think there is a way to do what you are asking.

 

[bob012345]

It is not clear what the setup is and why there is both a projector and a PC on.

 

[Drakkith]

yes this is what I mean just like glasses do, but ip i want to do it with a projector at a distance of 2 meters, some experts have told me that it is possible using the concept of focal point and for the eye it is 7mm, and to keep the eye still. Basically what I want is that I can only see what the projector shows me and not what surrounds me because it would not make me concentrate.

What you want falls into the realm of 'possible but extremely impractical'. If you've ever put on VR goggles, you may have noticed that they don't actually give you a view that encompasses your entire visual field. Looking up, down, left, or right reveals darkness. This is because the lenses are what is sending the light into your eyes and the lenses don't fully surround your eyes. Instead they occupy about a 90 to 110 degree area in front of your eyes. See left diagram below:

To increase the FOV, you either need to move the lens closer or make it larger (right diagram, ignore the lenslet array and other stuff and just look at where the collecting lens is).
So to do what you're wanting you need a lens that takes up most of your FOV at a distance of 2 meters. Which would be the size of a wall.
Not going to happen.

 

[bob012345]

Speaking as a display engineer who has worked with Head-Up Displays (HUDs) and devices similar to Google Glass, I don't think there is a way to do what you are asking.

Neural stimulation. One does not need a light source while dreaming.

 

[berkeman]

Thread is closed temporarily for Moderation...

 

[berkeman]

that's why I ask if it can be projected in the eye and not see nothing else, but only what the projector throws at me, thus occupying my entire field of vision

Well, I think we've done all that we can to help you. We are not going to help you figure out a system to shine bright lights into your eyes and onto your retinas -- that is very dangerous for someone with as little knowledge and skill as you seem to have (no insult intended; we are looking out for your safety).

Please talk to your doctor, and s/he will help you to figure out what you need to do to be able to concentrate fully on the image on your laptop or projector display in a darkened room. Please be well.