Where can I buy 3-D glasses?
Steve Rossiter
I have a neat video entitled "Head Candy: Aerobics for the Mind" with some
fascinating 3-D art work. It's a rental and is missing what they call the
"3-D
holographic glasses". I'd like to purchase a pair for myself, something
sturdier
and perhaps more effective than the typical cardboard cut-out glasses you
usually see. I'm hoping somebody can point me in the direction of a hobby
or science outlet that would sell such a thing. Thanks everybody. Steve.
Post or email to: SRos...@email.msn.com
Don Stauffer
First of all, even though they may call them "holographic glasses," in
all likelihood they have nothing to do with holography. Holography is
NOT a synonom for 3D, it is one of many techniques that create a 3D
image. You need to know which technology your video uses. In all
likelihood it uses colored glasses, the most common type for use with
unmodified TV (polarized technology will NOT work with standard TV
receivers). Then, you need to know which color goes with which eye.
I believe Edmund scientific may sell those glasses. Additionally, an
issue of Astronomy magazine a few months ago included two pair free.
Now, depending on the colors used, those may or may not work with your
video.
--
Don Stauffer in Minneapolis
home web site- http://home1.gte.net/stauffer/
home email- stau...@gte.net
work email- stau...@htc.honeywell.com
Brian Park
Don Stauffer wrote:
>
> Steve Rossiter wrote:
> >
> > I have a neat video entitled "Head Candy: Aerobics for the Mind"
If this is the same Head Candy that Brian Eno got roped into doing the
music for, I'm afraid it is not a 3D video at all, but simply uses the
"holographic" glasses to diffract the tedious images and make pretty
rainbows. Even Eno was pissedoff.
seeyalata
--
Brian Park
principal
flogiston corporation
realspace: Austin, Tx
mindspace: 512 894 0562
cyberspace: www.flogiston.com
mindspace is as immersive as cyberspace, just different.
b.h.j...@hw.ac.uk
On 1998-06-05 stau...@htc.honeywell.com said:
Newsgroups: alt.3d,alt.3d.misc,sci.optics,sci.physics
Steve Rossiter wrote:
> I have a neat video entitled "Head Candy: Aerobics for the Mind"
>with some fascinating 3-D art work. It's a rental and is missing
>what they call the "3-D
> holographic glasses". I'd like to purchase a pair for myself,
>something sturdier
> and perhaps more effective than the typical cardboard cut-out
>glasses you usually see. I'm hoping somebody can point me in the
>direction of a hobby or science outlet that would sell such a
thing. Thanks everybody. Steve. >
First of all, even though they may call them "holographic glasses,"
in all likelihood they have nothing to do with holography.
Holography is NOT a synonom for 3D, it is one of many techniques
that create a 3D image. You need to know which technology your
video uses. In all likelihood it uses colored glasses, the most
common type for use with unmodified TV (polarized technology will
NOT work with standard TV receivers). Then, you need to know which
color goes with which eye.
I believe Edmund scientific may sell those glasses. Additionally,
an issue of Astronomy magazine a few months ago included two pair
free. Now, depending on the colors used, those may or may not work
with your video.
--
Don Stauffer in Minneapolis
home web site- http://home1.gte.net/stauffer/
home email- stau...@gte.net
work email- stau...@htc.honeywell.com
I'm likely to be out of date here but the 1951 Festival of Britain 3D
polaroid specs were polarised at 45 degrees to the horizontal (or
vertical if you like), and at 90 degrees to each other.
In the cinema, some trick prevented the screen surface from depolarising
the light from the two synchronised projectors.
It gave me a headache. (I was far too young to have a headache for any
other reason, then.)
SO, you could make such 'specs by obtaining ordinary driving Polaroids
and rotating the lenses, one 45 degrees one way and the other 45 degrees
the other way.
Which is probably why they don't make the lenses circular.
============ ===== ===== BILL J. ===== ===== ============
GM8APX, qthr Edinburgh, Scotland, UK
Sic vos non vobis mellificatis, apes
Net-Tamer V 1.11 - Registered
Steve Berezin
Steve Rossiter wrote:
>
> I have a neat video entitled "Head Candy: Aerobics for the Mind" with some
> fascinating 3-D art work. It's a rental and is missing what they call the
> "3-D
> holographic glasses". I'd like to purchase a pair for myself, something
> sturdier
> and perhaps more effective than the typical cardboard cut-out glasses you
> usually see. I'm hoping somebody can point me in the direction of a hobby
> or science outlet that would sell such a thing. Thanks everybody. Steve.
>
Steve,
When you look at the video is it a double image or is it in
funky colors? If it is a double image you need LCD type
shutter glasses, if has two images of different colors you
probably need red/blue glasses. Polorized glasses don't
work on video. Tell me after you look and I can tell you
where to get them.
--
Steve Berezin
mailto:sb...@ix.netcom.com
L. Michael Roberts
b.h.j...@hw.ac.uk wrote:
>
> On 1998-06-05 stau...@htc.honeywell.com said:
> Newsgroups: alt.3d,alt.3d.misc,sci.optics,sci.physics
>
> > I have a neat video entitled "Head Candy: Aerobics for the Mind"
> >with some fascinating 3-D art work. It's a rental and is missing
> >what they call the "3-D
> > holographic glasses". I'd like to purchase a pair for myself,
> >something sturdier
> > and perhaps more effective than the typical cardboard cut-out
> >glasses you usually see. I'm hoping somebody can point me in the
> >direction of a hobby or science outlet that would sell such a
> thing. Thanks everybody. Steve. >
>
Silver screens are used to preserve the polarisation from the two movie
projectors or two laser projectors in the case of 3D laser systems. TV
does not preserve polarisation information so any system made to work in
conjunction with TV has to use some other method of image separation.
+====================== L. Michael Roberts ======================+
This represents my personal opinion and NOT Company policy
Burlington, Ont, Canada - to reply, remove 'SpamSux' from my address
+====================================================================+
Carl Seutter
Steve Berezin wrote:
> Steve Rossiter wrote:
> >
> > I have a neat video entitled "Head Candy: Aerobics for the Mind" with some
> > fascinating 3-D art work. It's a rental and is missing what they call the
> > "3-D
> > holographic glasses". I'd like to purchase a pair for myself, something
> > sturdier
> > and perhaps more effective than the typical cardboard cut-out glasses you
> > usually see. I'm hoping somebody can point me in the direction of a hobby
> > or science outlet that would sell such a thing. Thanks everybody. Steve.
> >
> > Post or email to: SRos...@email.msn.com
>
> Steve,
>
> When you look at the video is it a double image or is it in
> funky colors? If it is a double image you need LCD type
> shutter glasses, if has two images of different colors you
> probably need red/blue glasses. Polorized glasses don't
> work on video. Tell me after you look and I can tell you
> where to get them.
>
> --
> Steve Berezin
> mailto:sb...@ix.netcom.com
If the video looks normal without any glasses on (no double images, or double
images of different colors), then the video is relying on a pair of glasses with
one lens tinted neutral grey (gray, whichever way you want to spell it.) and the
other being clear. It's usually the left being clear and the right being tinted
to about 70% absorption. Any cheap eyeglass shop or chain should be able to set
you up. Don't go for the fancy places, a low budget shop can fill the bill.
(less than $60 US) If colored lenses are needed, they could also make them,
they would just need to know the color for each eye.
Carl
(Being a roller coaster fanatic, I once received a couple of 3-D roller coaster
videos for X-mas from a family member. The left lens clear and right lens tinted
grey glasses were used. I made a pair of glasses to that setup and they work
better due to better lenses and frame fit. Hey anything is better than
cellophane in a cardboard frame!)
k...@swbell.net
that sounds great!
was the video in good color or was it black and white?
thank,
kil
Carl Seutter
The videos looked like normal 2D color tapes you'd rent at the local video store
until you put the glasses on. Then again, the glasses have a similar, but less
dramatic effect when watching normal videos or broadcast TV (animations not designed
for it and video games don't seem to work ) . The technique is based off of our
perception. Dim the light reception of a scene sufficiently to one eye and the brain
perceives it as being different enough to process depth information from it. If a
person's binocular depth perception is deficient, they will not see the effect.
People wearing monocular contacts will have a similar problem. It's similar to
viewing stereograms. To most people it is interesting! Especially if you have
previously been on the roller coaster that the footage is being taken from. I've also
watched a few episodes of Deep Space 9 with them on. It did spice up the space combat
scenes. Binocular vision is the key. (It's tested for by eye docs, the test is the
"stereo fly" and other similar tests. {also, which ring is closer?} They use
polarized lenses mounted 90degrees apart, but if you pass that test, you can see the
effect of filtering one eye only.)
Carl
k...@swbell.net
so,
any idea how they code the video for this effect? i mean, the video
is still shot from two different angles, right? i wonder how they
make one eye see one angle and the other see the other? maybe one
view is dimmer than the other?
thanks again
kil
Carl Seutter
k...@swbell.net wrote:
> so,
> any idea how they code the video for this effect? i mean, the video
> is still shot from two different angles, right? i wonder how they
> make one eye see one angle and the other see the other? maybe one
> view is dimmer than the other?
>
> thanks again
> kil
>
Since the effect works on normal broadcast episodes to a moderate degree, I'd think that
there is little if any encoding. A slight increase in contrast would be about the limit.
The effect is due to neural processing and doesn't need much in the way of "coding." The
"coding" is already wired into our brains. Differences in signal timing OR position can be
interpolated as a depth cue. The signal for the same image in the eye looking through the
dark lens will be a few centiseconds off from the signal from the eye looking through the
clear lens. The slight buildup time before the cones affected reach their threshhold makes
the difference. The brain picks this up as a depth cue and relies on contrast and relative
shift to decide how much depth is there.
Considering the technology used, it's one video camera recording at a slightly higher
contrast setting than normal VHS recorders. There are not two cameras, just the one. The
depth perception is an illusion based on how we perceive things. Monocular people will not
see this effect. (even if both eyes work properly by themselves. )
> On Wed, 10 Jun 1998 08:27:44 GMT, Carl Seutter <"cseutter
> "@alaska.net> wrote:
>
> >The videos looked like normal 2D color tapes you'd rent at the local video store
> >until you put the glasses on. Then again, the glasses have a similar, but less
> >dramatic effect when watching normal videos or broadcast TV (animations not designed
> >for it and video games don't seem to work ) . The technique is based off of our
> >perception. Dim the light reception of a scene sufficiently to one eye and the brain
> >perceives it as being different enough to process depth information from it. If a
> >person's binocular depth perception is deficient, they will not see the effect.
> >People wearing monocular contacts will have a similar problem. It's similar to
> >viewing stereograms. To most people it is interesting! Especially if you have
> >previously been on the roller coaster that the footage is being taken from. I've also
> >watched a few episodes of Deep Space 9 with them on. It did spice up the space combat
> >scenes. Binocular vision is the key. (It's tested for by eye docs, the test is the
> >"stereo fly" and other similar tests. {also, which ring is closer?} They use
> >polarized lenses mounted 90degrees apart, but if you pass that test, you can see the
> >effect of filtering one eye only.)
> >
> >Carl
> >
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Rick Harmon
Look for "RealView" glasses; they work on this principle
- one side has a thick, dark lens (you get to figure out which eye works
better).
I got mine months ago from Damark (mail-order) for about $40
and they actually do yield some depth for some kinds of shows
(good lighting, outdoors or large set, good contrast, action, etc.)
Damark may or may not have them anymore, but I have been seeing them
in one of those yuppie gadget mail-order catalogues (TopiX or Sharper
Image).
ioannis galidakis
Rick Harmon wrote:
>
> Look for "RealView" glasses; they work on this principle
> - one side has a thick, dark lens (you get to figure out which eye works
> better).
> I got mine months ago from Damark (mail-order) for about $40
> and they actually do yield some depth for some kinds of shows
> (good lighting, outdoors or large set, good contrast, action, etc.)
> Damark may or may not have them anymore, but I have been seeing them
> in one of those yuppie gadget mail-order catalogues (TopiX or Sharper
> Image).
Apologies, i seem to have missed the original post, but for those who
cannot get hold of any 3d glasses, a simple trick will suffice. You can
view the rotating image on tv or cinema by placing the darkened lens of
some regular sunglasses on one of your eyes. It will achieve the same
results. The other type of 3d method, that of displaced imaging is
slightly different though.
Cheers
--
Ioannis Galidakis
my return address is a spam trap. Use:jg...@ath.forthnet.gr
________________________________________________________________
shadowolf
There are several approaches to creating stereoscopic displays. For
true stereo vision, each eye must recieve slightly different
information.
The first (and I believe oldest) is to place a red filter over one
eye, a blue over the other. The information for the left and right
eyes are both displayed on the same frames on screen, but are tinted
themselves such that the filters over the viewer's eyes only allow the
proper image to get to the proper eye. Used since the 1950's, but kind
of cheezy.
The technique was refined by replacing the color filters with
polarization filters... the lenses you wear over the eyes look like
odd sunglasses. These are the types of lenses currently used at
attractions such as the 3d movies at walt disney worlds and universal
studios. Next time you're at one of these attractions try holding one
lens of the glasses over your eye while you view the film, and then
rotating the lens 90 degrees.
A newer approach is the LCD shutter display, such as is used by the
crystal eyes shutter glasses and the displays at certain IMAX
theatres. The glasses intermittently block the display from one eye to
the next while the movie is synchronized to only display the proper
frame of animation for the eye currently allowed to see.
Even better (IMHO) are head-mounted-displays, or HMDs. The VFX1 and
the i-glasses are cheaply available, and HMDs are now being used in
many industry applications as well as Virtual Reality entertainment
centers such as DisneyQuest in Orlando. HMDs display completely
separate images to each eye, usually by completely separate LCD
displays. Resolution and refresh rate are the main issues here, as
well as the weight of the HMDs themselves.
And the most recent and promising solution... Researchers have now
develloped a thimble-sized device capable of using 3 colored lasers to
directly project light on the retina of the eye itself. Varying levels
of light can be used to either completely obscure the view of the
outside world or to "ghost" images over the "real world." See the most
recent Discover Magazine Innoventions Awards for more info. It will be
a while yet before we see commercial application of this still
experimental tech, but it sounds ideal.
Georges-Henry Portefait
We (Sim Team) are selling Crystal eyes and various model of HMD, feel free
to contact our sales deparment sa...@simteam.com
billy
shadowolf wrote:
>
> There are several approaches to creating stereoscopic displays. For
> true stereo vision, each eye must recieve slightly different
> information.
There's one way you didn't mention: There's a company called
"ChromaTek" that sell glasses that map color to distance, with red
appearing close, blue far away, and other shades in between. You can
get a 3D image from a single picture. The disadvantage is that you no
longer have the freedom to choose any color you wish for your objects.
Their homepage is http://www.chromatek.com/
BC
--
,-------------------------------------------------------.
~~ ; My views are not necessarily those of Lockheed Martin, :
C--O\ ,-=. unless that would persuade you to buy several aircraft. :
- `-------------------------------------------------------'