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Using Cellophane For 3D Displays On Your Laptop
prestidigital writes "From the abstract:
[the authors] present a novel, inexpensive, stereoscopic technique for generating 3D displays from cellophane and a laptop computer screen.
(Once again my physnews update sends me email that doesn't suck!)"
no duct tape?
My problem? I was perfectly gruntled, until some numbnuts came by and dissed me.
Cell o phone ???????
Looks neat, but do you need anything that converts images?
Site seems a little slashdotted too.
Okay, I just had to respond to this. I've been a long-time semi-dabbler in stereophotography, and naturally anything 3-D related on /. just jumps right out at me (sorry about the pun). This article, while organized in a scholarly-looking fashion, really doesn't present anything new whatsoever. In fact, if I'm reading it correctly, you can achieve exactly the same results with no cellophane at all!
They talk a lot about cellophane having natural polarizing characteristics (I'd never heard that, but okay). Then they talk about how laptops have polarizers built into them -- sure, I've known that ever since the glasses for Starchaser: Legend of Orin made my digital watch look funky. Where their article breaks down is in the actual application of polarizing technology on the laptop.
They suggest putting the right eye's image on the left half of the screen, and the left eye's image on the right, then using polarizing filters to ensure that each eye only sees what's appropriate for it. Great. No problem. Except that there is one problem -- when your left eye is looking at the right half of the screen, your right eye is looking there, too!!
In order for your brain to properly "fuse" the images together, your eyes will have to perform some tiresome calisthenics -- that is, your left eye is going to have to turn slightly right, to face the right half of the screen, while your right eyes turns slightly left. Basically, you're crossing your eyes.
If you're just going to cross your eyes anyway, drop all the cumbersome cellophane goggles and overlays and crap, and simply look at two images side by side.
Also, I'm not convinced that placing a polarizer over half the screen wouldn't just turn that half of the screen totally black (as shown in figure 2 of the paper).
The challenge for 3-D image display isn't blocking the "wrong" images from each eye, it's blocking the wrong images when they're displayed in the same space -- overlaid in a single frame. For that, you need colors (anaglyphic glasses), or polarizing filters (again, though, both images displayed in the same space), or lcd shutters (multiplexing the images in time, rather than in color or polarization). Or you can use a lenticular screen, that bends the images left or right and draws them in a series of interlaced vertical stripes.
But not what they're suggesting here. It all seems pretty useless to me.
[obCaveat: "Unless I'm missing the point entirely."]
No, this is science.
The unofficial
Dude1: Hey, you been pr0ning again? Dude2: Erm, no way dude! Dude1: So why you got cellophane over your screen?! Dude2: 3D display man, 3d display Dude1: Aahhhhhh
I can't wait to try this with TuxRacer.
Boromir, son of Faramir, King of Gondor and Minas Tirith
Sheesh, evil *and* a jerk. -- Jade
thats hilarious man
The unofficial
But, if things will be like is shown in Fig 4, I have to wear two pairs of glasses for work in 3d?
I recommend wrapping the cellophane around your head. It takes very little time after application before things look 3D, an effect that lasts suprisingly long before everything goes black.
FYI, cellophane is not a self adhesive phone :)
cellophane dude, you know saranwrap...
I never said I was smart, I just said I was smarter than you
Should read:
"Once again my physnews update sends me email that sucks!"
Wow, congratulations on removing a word!
Platform independent bug tracking software
http://perljam.net/cache/individual.utoronto.ca/i
-ted
Porn companies have decided to ship Cellophane to their customers free of charge. ;)
smd4985
This technique does not, however, protect your servers from a severe /.ing! 30 comments and already down... Woo hoo! Way to go guys!
Webmaster Wanted - Entropic Reactions
Heh.. and if we took that attitude, we'd still be riding in carriages pulled by horses, watching cinema acompanied by live piano or organ music, and looking up at the sky wondering if man would ever take to the skies.
I don't know - I really don't look on these interim inventions as the real progression, but they all help develop bigger better things later on down the line.
And besides.. I like that my cellphone can take photos, or play silly music instead of a shrill and bland ringing noise!
"Hey! Unless this is a nude love-in, get the hell off my property!!"
lol I knew this would generate some interesting responses.
You're right, I wouldn't steal a car. But if it were possible, I sure as hell would download one!
sure.. play it like that and no one will ever know what a degenerate waste of carbon you are
Don't forget the 's'!
I believe displays that use this technique already exist, but couldn't you print a transparency with a special dot pattern, and place it over the laptop screen? The dots would be arranged so that the parallax from your eye spacing would block the pixels that the other eye can see. Laser printers have much more resolution than LCD screens, so you could adjust for the changing viewing angle from the center to the edges of the screen. You'd have to be able to control the distance from the mask to the screen pretty accurately, and there would be pretty much only one viewing position.
...
They caught him infringing on their IP property by using 12 lines of SCO code in his homebrew linux computer's kernel. Please help us save this young man. Check out The Mike Green Challenge site today, to help rescue this young man from the oppressive clutches of SCO and Micro$oft.
...you'll see a 3-d star field. But it fades out after a while.
Using cellophane to convert a laptop computer screen into a three-dimensional display
Keigo lizuka
Department of Electrical & Computer Engineering
35 St. George Street
University of Toronto
Toronto, Ontario, Canada M5S 1A4
Abstract
We present a novel, inexpensive, stereoscopic technique for generating 3D displays from cellophane and a laptop computer screen. Stereoscopy requires independent manipulation of the left and right eye views.1 Our technique takes advantage of two facts; the first is that the light from the liquid crystal display of a laptop computer is polarized light 2, and therefore we can easily manipulate its transmission with a polarizer sheet. The second fact is that a cellophane half-waveplate can change the direction of polarization of light. The direction of polarization of one half of the laptop screen was rotated by the cellophane half-waveplate. Two images displayed with orthogonal polarization on two halves of the screen become separable by wearing a pair of glasses of orthogonal polarization.
A distinct advantage of our technique is its simplicity; a laptop screen can be converted into a 3D display with minimal knowledge of optics. An additional advantage of our technique is that we can eliminate the need for the observer to wear special glasses by making the computer wear the glasses instead. This is possible because a laptop computer normally has only one viewer at a time, and the relative orientation of the viewer's head and the laptop screen is sufficiently stationary. A further significant discovery is that we verified that cellophane (costing mere pennies) proved to be a better half-waveplate than a commercial half-waveplate (costing hundreds of dollars for the required size) for rotating the polarization of white light.
1. Properties of cellophane
Let us begin by examining the properties of cellophane. Cellophane is fabricated by protruding an alkaline viscose solution through a narrow die into an acid bath. Because of the unidirectional strain during the protruding process, cellophane is an anisotropic material and it behaves like a calcite crystal. The refractive index ny of cellophane measured by a light wave component polarized in the direction of the longer dimension of the rolled cellophane (in the y direction) is larger than nx, measured by a light wave component polarized in the direction of the shorter dimension (in the x direction).
As a result, the component polarized in the x direction propagates through the medium faster than the component polarized in the y direction. After transmission through such a medium, a phase difference arises between these two light wave components. The difference ny-nx in the refractive index and the thickness of the cellophane determine the amount of the phase difference between the components polarized in the x and y directions. A medium that creates a 180o phase delay is a half-waveplate. The phase difference incurred in plain ordinary colorless cellophane (our sample had a thickness of 25 microns was measured to be 170.2o , which is about 95% of the phase delay of an ideal half-waveplate. These measured results are within acceptable limits for a number of practical applications that do not require a precise 180o phase delay. Having demonstrated the feasibility of using cellophane as a half-waveplate, we now examine what a half-waveplate does and how it can be used to create a 3D display.
One of the most important functions of a half-waveplate is its ability to rotate the direction of polarization of the transmitted light. We found that cellophane's performance in rotating the direction of polarization of white light was superior to that of a commercially available half-waveplate designed for a specific wavelength. An added bonus is that cellophane is very inexpensive. Before describing the role of a half-waveplate in generating 3D images, we need to introduce some basic stereoscopic principles.
2. Stereoscopic principles
Figure 1 explains the basic principle of
Damn it all, it don't work for people who are blind in one eye!
Someone make a 3D thingy for those people!
Before some idiot invents the "condom phone".
You have been forewarned.
Zero comments and it's already slashdotted!
This means everyone went to read the article before posting. (Gasp!)
They probably just wanted to figure out what the hell cellphane is...
The unofficial
Using cellophane to convert a laptop computer screen into a three-dimensional display Keigo lizuka
Department of Electrical & Computer Engineering
35 St. George Street
University of Toronto
Toronto, Ontario, Canada M5S 1A4
Abstract
We present a novel, inexpensive, stereoscopic technique for generating 3D displays from cellophane and a laptop computer screen. Stereoscopy requires independent manipulation of the left and right eye views.1 Our technique takes advantage of two facts; the first is that the light from the liquid crystal display of a laptop computer is polarized light 2, and therefore we can easily manipulate its transmission with a polarizer sheet. The second fact is that a cellophane half-waveplate can change the direction of polarization of light. The direction of polarization of one half of the laptop screen was rotated by the cellophane half-waveplate. Two images displayed with orthogonal polarization on two halves of the screen become separable by wearing a pair of glasses of orthogonal polarization.
A distinct advantage of our technique is its simplicity; a laptop screen can be converted into a 3D display with minimal knowledge of optics. An additional advantage of our technique is that we can eliminate the need for the observer to wear special glasses by making the computer wear the glasses instead. This is possible because a laptop computer normally has only one viewer at a time, and the relative orientation of the viewer's head and the laptop screen is sufficiently stationary. A further significant discovery is that we verified that cellophane (costing mere pennies) proved to be a better half-waveplate than a commercial half-waveplate (costing hundreds of dollars for the required size) for rotating the polarization of white light.
1. Properties of cellophane
Let us begin by examining the properties of cellophane. Cellophane is fabricated by protruding an alkaline viscose solution through a narrow die into an acid bath. Because of the unidirectional strain during the protruding process, cellophane is an anisotropic material and it behaves like a calcite crystal. The refractive index ny of cellophane measured by a light wave component polarized in the direction of the longer dimension of the rolled cellophane (in the y direction) is larger than nx, measured by a light wave component polarized in the direction of the shorter dimension (in the x direction).
As a result, the component polarized in the x direction propagates through the medium faster than the component polarized in the y direction. After transmission through such a medium, a phase difference arises between these two light wave components. The difference ny-nx in the refractive index and the thickness of the cellophane determine the amount of the phase difference between the components polarized in the x and y directions. A medium that creates a 180o phase delay is a half-waveplate. The phase difference incurred in plain ordinary colorless cellophane (our sample had a thickness of 25 microns was measured to be 170.2o , which is about 95% of the phase delay of an ideal half-waveplate. These measured results are within acceptable limits for a number of practical applications that do not require a precise 180o phase delay. Having demonstrated the feasibility of using cellophane as a half-waveplate, we now examine what a half-waveplate does and how it can be used to create a 3D display.
One of the most important functions of a half-waveplate is its ability to rotate the direction of polarization of the transmitted light. We found that cellophane's performance in rotating the direction of polarization of white light was superior to that of a commercially available half-waveplate designed for a specific wavelength. An added bonus is that cellophane is very inexpensive. Before describing the role of a half-waveplate in generating 3D images, we need to introduce some basic stereoscopic principles.
hey man. at least i have the balls to troll on my real account and not anonymously.
i'll have to come up with something not-as-good for the next article so morons like you actually get the joke.
You're right, I wouldn't steal a car. But if it were possible, I sure as hell would download one!
No, because your right eye is wearing a polarizer that blacks out the right half of the screen and lets it see only the left half. See figure 3.
" Damn it all, it don't work for people who are blind in one eye!"
what??? Do you mean to tell me if you are blind in both eyes, this will work fine?
Don't blame Durga. I voted for Centauri.
Does this mean that Nokia will come out with a cool new cellophone with one of these 3-d saranwrap displays?
Don't blame Durga. I voted for Centauri.
cellophane has a poor separation quality, i.e the difference between 90 degrees (blocked) and 0 degrees (pass) polarized light is little.
Real lab-quality polarizer crystals are way to expensive and generally too small for this application.
however, sheet polarizing material can be bought in photo equipment stores and cut to size with normal scissors. It's more expensive than cellophane but less expensive than lab polarizers and has a quality that is waaaaay better than cellophane. I paid about 15 bucks for 25*25 cm. about 8 years ago in Germany. Hama sold them at the time
This animated GIF technique showed up on Metafilter a couple of weeks ago, and for me it was one of those "Why the hell didn't anyone try this sooner" epiphanies for me. Yes, the constant jitter while flipping between frames gets old, but not nearly as old as straining your eyes with the 'cross-eye' viewing method.
... so their burgers don't look so flat.
Buy Steampunk Clothing Online!
(Once again my physnews update sends me email that doesn't suck!)"
I beg to differ.
I won't be happy till I get 3-d pop-ups from hell all displaying a diffrent a cum-shot!
I'd hate to have to peel off the melted cellophane from the LCD.
Alex.
Next up is a virtual reality display that you can build using only a pair of tweezers, a toaster, tin foil and a blender.....
does it work with edible underwear, too?
Healthcare article at Kuro5hin
So I didn't RTFA.
I'm assuming its similar to this .
I just hope the solution was more inventive than doing the old theatrical movie stunt about using relative shifting of color information and celluloid glasses - which gives you depth information at the expense of color information. Spy Kids 3D just did this using a blue or green image for the left eye and a red image for the right.. That one's been around since the 40's. In both movie and book. Cute trick but it gives me headaches to see it for any length of time.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]
Now that everyone can create 3-D pr0n in the comfort of thier own home, (the cellophane doubles as a great um... contaminant guard)
...when do we get the Scratch N Sniff feature?
do() || do_not();
I guess that this is more proof of the old saying that technology is driven by either
a) Man's desire to impress women
b) Man's desire to find a subsitute for women when he is rejected
We all got the shitty joke. It's that you pointed out it was a joke, thus stripping your original post of any comedic value. Also, you like dicks.
This reminds me of a rather famous April fools joke here in Sweden. Some guy (known for his technical expertise in different matters) said, on TV, that if you put nylon stockings or pantyhose over the screen, you got color TV (this was in 1962).
There are 010 kinds of people. Those who understand octal, those who don't, and 06 other kinds of morons.
This idea has been around for years. I first saw in the "Garage VR Handbook", which was published in the early 90's.
Sigpilot : I'm in the pipe, 5 by 5.
Just put cellophane over your head, be sure to cover your nose and mouth.
Stare at your laptop screen and it'll start spinning & rotating. It doesn't work for very long though. My frags dropped after a bit, dunno why.
Good security is based upon reality and common sense. Common sense is a function of having common knowledge.
"Some guy (known for his technical expertise in different matters) said, on TV, that if you put nylon stockings or pantyhose over the screen, you got color TV (this was in 1962)."
I know this bloke. Goes by the name of MacGuyver, right? Same guy once made a laser cannon out of a 9 volt battery, an ice cube, and a kitchen collander. He can use escape from prison using a paperclip, a piece of chewing gum, and the head of an action figure.
Don't blame Durga. I voted for Centauri.
What was it that featured "Biclops: The Man with Two Eyes" as a superhero? I think it was The Simpsons, but I could be wrong.
Don't blame Durga. I voted for Centauri.
6) Profit
I tried for 5 years to come up with a clever sig...only to realize that I am not clever.
So long, michael. Don't let the door hit you...
It is only a matter of time before SCTV's Dr Tongue (maker of 3-D House of Pancakes and 3-D House of Beef) sues these guys for prior art.
Don't blame Durga. I voted for Centauri.
Here's a short but decent article on the same research.
It would save people a lot of bother if we posted links to new stories in the past so that the news stories would appear on Slashdot with pre-slashdotted links.
Don't blame Durga. I voted for Centauri.
This sounds very interesting. I don't understand this part though:
"Two images displayed with orthogonal polarization on two halves of the screen become separable by wearing a pair of glasses of orthogonal polarization."
No you don't.
So you have to wear special glasses to use this tecnique. But two lines later:
"An additional advantage of our technique is that we can eliminate the need for the observer to wear special glasses by making the computer wear the glasses instead."
Am I missing something?
That doesn't sound so bad. I might even get to have a whole weekend off of work.
Coding Blog
This is a interesting thing i noticed once, and it works on probably any monitor.
Basicaly by putting your face close to your monitor and focusing past the monitor surface, you can make any real image appear to have depth.
Dont do it for a long time as it will no doubt hurt your eyes.
Im not sure exactly why it works, but i have my guesses. your eyes split the image when you focus on a point past the surface.
In America we are imprisoned by our fear of them.
Yes, those animated GIFs achieve a 3D effect. They do so via motion, however, not via stereo--a completely different mechanism. You can actually be blind to depth from motion and still perceive stereo and vice versa. The fact that it works by alternating between stereo pairs has to do with the way motion perception works.
Using motion to indicate depth has a long history in computer graphics. The obvious problem is that it requires the viewpoint or the object to move significantly, not always desirable.
Images that use motion to indicate depth don't have to look as horribly jittery as those animated GIFs: the effect works just as well with nice, smooth motion sequences. So, get out your camcorder and make some nice animated images.
I had this idea myself, actually, but it was stemmed from being pissed off that there was no good, cheap VR headmounted gear.
:-)
I was thinking about using 2 relatively-cheap cellphone LCD displays, mounting them with some lenses, and using that for some nice 320x200-style action. I figure the lcd driver machinery should be cheap and/or have well-enough-documented interfaces, and so wouldn't be *that* hard. Then again, there are many massive projects that were spawned from solutions that were 'not too hard'.
Oh well, at least they are doing something with it. I just went to earthlcd.com and checked prices and looked at some lcd driving machinery. Whatever, I hope they get their product nice and cheap.
fair.org counterpunch.com truthout.com indymedia.org salon.com
eff.org guerrilla.net debian.org gentoo.org
Explain how answering a question is 'redundant'?
Apologies to everyone for this. A coworker just had a little fun at my expense.
Oh, man that's sick!
Sucking off a man with just one ball.
How low can Slashdot go?!
The display on my laptop just croaked out last week and now I have to use it through a KVM on a standard CRT.
Arrrgh!!
So I figured I'd shake my head, synchronized, in the opposite direction of the image shake, separating my eyes with my hand. I studied, ahem, one of the pictures for quite a while to get it right.
:)
It works - real stereo viewing.
And gives me quite a headache.
My God, it's Full of Source!
OUTSIDE_IP=$(dig +short my.ip @outsideip.net)
I bet this guy reads Slashdot, too.
It's been a while since I've looked into optics, but with having to basically display the same image on each half of the screen, won't monitors have to become extremely large to make any kind of 3D display worth while? Or is there some special property I'm overlooking that would allow functional 3D displays on todays "small" LCD screens?
I could see this becoming very useful for building 3D UI's where you could technically stack things on top of each other. Might have to play around with the point-and-click ability, but nevertheless cool.
In C++, friends can touch each others private parts.
Using cellophane to convert a laptop computer screen into a three-dimensional display
Keigo lizuka
Department of Electrical & Computer Engineering
35 St. George Street
University of Toronto
Toronto, Ontario, Canada M5S 1A4
Abstract
We present a novel, inexpensive, stereoscopic technique for generating 3D displays from cellophane and a laptop computer screen. Stereoscopy requires independent manipulation of the left and right eye views.1 Our technique takes advantage of two facts; the first is that the light from the liquid crystal display of a laptop computer is polarized light 2, and therefore we can easily manipulate its transmission with a polarizer sheet. The second fact is that a cellophane half-waveplate can change the direction of polarization of light. The direction of polarization of one half of the laptop screen was rotated by the cellophane half-waveplate. Two images displayed with orthogonal polarization on two halves of the screen become separable by wearing a pair of glasses of orthogonal polarization.
A distinct advantage of our technique is its simplicity; a laptop screen can be converted into a 3D display with minimal knowledge of optics. An additional advantage of our technique is that we can eliminate the need for the observer to wear special glasses by making the computer wear the glasses instead. This is possible because a laptop computer normally has only one viewer at a time, and the relative orientation of the viewer's head and the laptop screen is sufficiently stationary. A further significant discovery is that we verified that cellophane (costing mere pennies) proved to be a better half-waveplate than a commercial half-waveplate (costing hundreds of dollars for the required size) for rotating the polarization of white light.
1. Properties of cellophane
Let us begin by examining the properties of cellophane. Cellophane is fabricated by protruding an alkaline viscose solution through a narrow die into an acid bath. Because of the unidirectional strain during the protruding process, cellophane is an anisotropic material and it behaves like a calcite crystal. The refractive index ny of cellophane measured by a light wave component polarized in the direction of the longer dimension of the rolled cellophane (in the y direction) is larger than nx, measured by a light wave component polarized in the direction of the shorter dimension (in the x direction).
As a result, the component polarized in the x direction propagates through the medium faster than the component polarized in the y direction. After transmission through such a medium, a phase difference arises between these two light wave components. The difference ny-nx in the refractive index and the thickness of the cellophane determine the amount of the phase difference between the components polarized in the x and y directions. A medium that creates a 180o phase delay is a half-waveplate. The phase difference incurred in plain ordinary colorless cellophane (our sample had a thickness of 25 microns was measured to be 170.2o , which is about 95% of the phase delay of an ideal half-waveplate. These measured results are within acceptable limits for a number of practical applications that do not require a precise 180o phase delay. Having demonstrated the feasibility of using cellophane as a half-waveplate, we now examine what a half-waveplate does and how it can be used to create a 3D display.
One of the most important functions of a half-cuntplate is its ability to rotate the direction of polarization of the transmitted light. We found that cellophane's performance in rotating the direction of polarization of white light was superior to that of a commercially available half-waveplate designed for a specific wavelength. An added bonus is that cellophane is very inexpensive. Before describing the role of a half-waveplate in generating 3D images, we need to introduce some basic stereoscopic principles.
2. Stereoscopic principles
Figure 1 explains the basic principle of
Please keep in mind that this post started as +2. In my opinion it's very insightful, but that's just my opinionl. If you don't understand it, don't mod it down, ok?
Do you mean to say that wildcat is on teh spoke?
The thing is your eyes do "cross" when you're looking at something close up.
Try this: hold your finger six inches from your face, with your monitor in front of that. You'll notice that if you close each eye the image of your finger is in front of the opposite half of the screen.
Now, if you put the cellophane on the other side of the screen, instead of the image appearing between you and the screen, it would be behind the screen.
It's the same as if you cross your eyes when you look at those sterescopic pictures at the mall. If you focus past the image, it pops out, if you cross your eyes it pops in (that might be the other way around).
Crazy - great effect - looks like a motor drive (a retronym?) and some handheld camera shake is enough to take a 3D picture.
Couldn't I just take a regular old CRT monotir, put celophane over the right half to polarize it, then put another pice of celophane over the left half, but rotated 90 degrees, and still end up with two halves of a monitor polarized 90 degrees from each other?
paintball
Think of it as just looking at a spot in the air between you and the screen - the object overing in the air between the screen and the observer in the fugure.
Of course, you could just put the left eye image on the left side and focus on a point behind the monitor as well, but in order to get good image size you'd have to be pretending to look at something pretty far away (or holding your monitor real close).
paintball
couldn't you do the same with a regular monitor and a poleriseing screen? of course if your controling the direction of polerisation anyway you could dispence with the celophane entirely
What was it that featured "Biclops: The Man with Two Eyes" as a superhero?
What about the classic line from "The Yellow Submarine"?
"Look out, it's a cyclops!"
"It can't be a cyclops, it's got two eyes."
"Look out, it's a bicyclops!"
That modded down thing is my sig bud. I'm making fun of all the morons on slashdot who put that in their posts in an attempt to draw sympathy from mods.
You're right, I wouldn't steal a car. But if it were possible, I sure as hell would download one!
I know OSDN is a "struggling enterprise," and both you and g'parent are trolls, but I'll respond anyway. I think the problem is not one of supporting /., which most people will do, it's a matter of journalistic integrity. The ability to discern ads (or "sponsored" stories) from real stories is critical. The LA Times got roasted a few years back when it did a "story" on the Lakers' new arena, which turned out to be paid for.
So the question is, is slashdot expected to have any journalistic integrity? If so, then people have a right to complain about stories that look paid for. I haven't heard Taco's party line regarding paid-for stories lately.
-Looking for a job as a materials chemist or multivariat
Oops... my bad.
And I bet that works, too. I think I saw a counter-sig out there that says something like, "If you put 'I'll probably get modded down for this...' in your post, I will mod you down." Now that guy is a tool...
So long, michael. Don't let the door hit you...
Actually, it depends on whether the individual's depth perception is more triangulation based, or focus based. If it is focussed based, then the eyes will point the way you say. If it is triangulation based, then they will be looking at an out of focus image floating in front of the machine.
This is where this method will fall down. Either the person will triangulate their eyes based on the focus depth of the image in the dominant eye, or they will focus based on the triangulation depth of the virtual image. With this method, it is either one or the other. The brain will constantly be trying to focus based on the triangulation, or triangulate based on the focus, and you'll wind up with either tremendous eyestrain, or a vicious headache.
Really good stereoscopic systems will have the image focus depth and the image triangulation depth at the same "distance", so that your brain doesn't have to do any extra work to perceive the image.
"I'm not impatient. I just hate waiting." - My Dad
Neat trick, but its pretty obvious.
Now, with all this GPU power and speedy ram we have to drool over these days on our videocards, why doesnt someone just hack together a driver that calculates and displays a stereoscopic image? Or does this already exist?
I seem to remember SMS games that used the 3d glasses, though I have never played one, so I don't know how it worked exactly....
Then these stupid glasses I got from the 7-11 years ago, would be useful.
---Up Up Down Down Left Right Left Right B A START
I'm completely baffled by what seems like a totally pointless system. If you're going to put a pair of "glasses on the computer," all you need to do is use a pair of lenses that have the right focal length to view the screen sharply, and the right amount of "prism" to provide a comfortable amount of convergence to the eyes.
This is essentially what the Wheatstone stereoscope--the familiar Victorian parlor stereoscope--did, well over a century ago.
The cellophane and the polarizers add nothing much useful to this, except to contribute eyestrain by forcing you to become crosseyed or walleyed.
And the obvious question is: how is a system that requires you to hold your head in a fixed position better than one that forces you to wear glasses but allows at least a small amount of freedom of head motion?
"How to Do Nothing," kids activities, back in print!
Sounds like an interesting experiment.
Do you think that the problem was because of the separation between the screen and the transparent foil? It would have to be extremely precise.
The placement of the dots would also have to take in to effect the different angles that your eye would follow to see pixels on the left and right sides of the screen.
What about using a half-waveplate with holes punched in it for every other pixel? This could then be placed right up against the screen. The position would just need to be adjusted to fit the LCD pixel grid.
You would have to use something more rigid than cellophane, of course. You would also still need polarizing glasses.
Unless you work at places where seeing full frontal nudity (that "jiggles") is permitted.
The way it works in theatre is that one eye sees one color and the other eye sees the other color, whose images are just barely offset from each other in the same frame. But that only works because each eye has an independant filter. If both filters are right on top of the frame it won't do any good, you'll just end up with a tinted screen.
MacGyver
Honey, I shrunk the Cygwin
In other news the gross national usage of cellophane went through the roof this week as thousands of geeks tried to test it's light altering abilities.
I just threw away a bunch of celophane after tring to get it to polarize or block light from my laptop. Can someone who got this to work a little send me the "oh yeah" clue I'm missing?
M@
Krispy Cream is people
It would sure beat getting a headache from crossing your eyes. It might also help to keep focus when you try to focus on something on the screen in 3D, but of course.. it's on the screen.. so it's no in 3D.. and everything goes blurry again.. while you try to re-cross your eyes and keep from getting fragged at the same time.
Now.. if someone could make StereoUT(2003) ....
You can also do this with a standard monitor and a mirror. I you put the two images side by side and place a mirror between the two, you get the same effect.
Two comments:
The polarization 3D effect causes severe headaches and eye pain in some people. Stick with red/green red/green is your friend, red/green ask for it.
IcePirates was that stupid, ignorant, lame, ugly flick that used these to steal water from earth when there was plenty just floating around in space. Or something equally bad.
I'd go on a Vegan diet but the delivery time from Vega is too long. --brownkitty
My problem is that I don't like ads. Yes it is too hard to click. Yes I do block ads and cookies. You don't like it? Too bad. My computer. My eyes. I'll read what I want when I want in just the way I like it, and the only cookies are the tough cookies for you to eat! And your name-calling bout isn't even worth responding to.
Those screen shots look two-dimensional to me.
I object to that article, and to the next reply.
At work we tried using lighting gels when we saw the "3d StrongBad."
It worked.
Slashdot editors, please give up posting articles on stereoscopy, as it is plainly obvious that you know nothing about the subject. How else does one explain the posting to the front page of yet another worthless "paper" such as this one?
Firstly, the technique still requires you to stress the visual system's control systems triad (Google for it or read ISBN 0306446677), because the distance at which your eyes must focus is very different to that at which they must converge. As has been pointed out, this is equivalent to freeviewing, which a) requires no special equipment, and b) is crap.
Secondly, the one advantage over plain old freeviewing is that the unwanted images are blocked by the polarising arrangement. Aside from the rather dubious value of this, you can achieve exactly the same effect with two pieces of card. Look at the diagram in the paper, it's rather obvious where you can put them. Better still, for the full Slashdot experience, why not simply take a pair of glasses and paint a black stripe down the middle of each lens! And then write a paper about it! You could even write it on actual toilet paper so it isn't completely useless.
Polarised stereo is already commonplace, but in projection, where the two orthogonally-polarised images are projected at the same point in space. This is actually useful and comfortable to view. Polarisation is also the basis of some parallax barriers used in autostereoscopic displays, and in general can be used in lots of creative, clever and useful ways in stereo. This "paper" isn't one of them.
Please, either give up posting "science" articles, or hand the editing responsibilities over to someone who has a clue. Watching you publicise this kind of rubbish is embarrassing.
I'd have posted this info yesterday if I had actually been able to RTFA.
One of the interesting effects of binocular photographic images (e.g. those looked at with a Viewmaster) is that they are not only stereo, but the fused image is perceived as twice the resolution as either of the two constituent images. Binocular solutions such as the one outlined here halve the resolution of the screen to achieve their stereo effect.
Bah.
Far preferable to put a small, cheap, 640 x 480 monitor in front of each eye which will be not only fused by the processor behind the eyes into a stereo scene, but one at 1280 x 960. This implies kludgy wires, though, or brain-frying bluetooth.
Or . . . or maybe you could teach yourself to wink with alternate eyes in synchrony with a screen that showed two views in quick succession. For user training, I envision a headmounted device with leads taped to the eyelids, and just a touch of voltage applied as negative feedback when the user is out-of-synch.
will acheive the same effect. Have the two images displayed side by side and place the mirror between.
Yes, stuff hitting you in the face would be notably limited, but the wedge doesn't stop at the LCD screen---it extends away from you to infinity.
The effect (and the affect, for you psychologists out there :-) comes from your eyes/brain applying what they know about parallax to the funky display. The larger the shift in position (relative to each half-LCD frame), the closer the synthesized object appears. At some point, the delta is great enough that if you believed your eyes/brain, the object would be behind you; that way lies headache.
The smaller the shift in position, the farther away it seems, until they're in the same location (again, each wrt its own half-screen), and the object seems to be at infinity (or however far away something must be for binocular vision to be of no help judging distance).
The result is that the technique can generate the sort of images you could see by looking through a piece of cardboard with a hole the size and shape of one-half your laptop's screen. It's a lot larger than a stage as seen from the cheap seats.
If you're truly bored, you can make such crossed-eye 3-D images on paper, with pencil, ruler, and a lot of fiddly proportionality calculations. I used to do it in school (well before computers were playthings for seventh-graders) in the dull classes.
I refuse to believe corporations are people until Texas executes one. -- desert rain on http://www.dailykos.com/user/
thought you'd like to know.