Why do Real D 3D glasses work in the cinema but they wont work with any other 3D images at home Are there any images that do work?


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2011-11-08 20:18:53
2011-11-08 20:18:53

Real D 3D movies work by projecting two copies of the movie onto the screen, one after the other in quick succession. One series of frames is from the perspective of the left eye, while the other is from the perspective of the right eye. The left and right projections have different light polarizations. The left lens of the 3D glasses allows the light from the left projection to be seen by the left eye, but prevents light from the right projection being seen by the left eye. The right lens does the opposite, allowing only the right projection's light to be seen by the right eye. This has the effect of making the right and left eyes see slightly different versions of the movie, each from a different perspective, just as occurs when viewing a real-world scene. The human brain naturally combines the two two-dimensional images into a single, 3-dimensional scene.

This doesn't work at home on a television or monitor because the monitor is not projecting two different images and even if it were, it can't polarize the light from each image so that it's filtered by the lenses.

In Addition:

  • Traditional red / blue 3D images use the same principal of filtering light for each eye, but use color as the filter instead of polarization, and therefore do not work with Real D 3D glasses.
  • The glasses themselves are not tailored to a specific movie or theater. Real D 3D glasses should work with any Real D 3D movie.
  • Real D 3D is a proprietary item belonging to REALD the company and in essence what happens is movie theaters buy a item that fits over the lens of their projector that projector shoots the image through REALD'S apparatus and then projects onto the screen therefore without that apparatus you have no REAL D 3D and rather only 2D... hope that helps ...check out amazon though for some more comfortable 3D glasses rather then the cardboard stuff.
  • The "3d glasses" have a horizontally polarized filter in the left lens and a vertically polarized filter in the right lens. The cinema uses a projector with two separate images on the film. The left image is projected through a horizontal polarizer and the right image is projected through a vertical polarizer. The two images have slightly different 'perspectives' because they were recorded using a camera with two lenses, one for left, the other for right (just like your eyes). This system generates a combined stereoscopic image which is synchronized and which is how the 3D effect works. Incidentally the sound is recorded in the same way which is how you get stereo (or even surround sound) in the cinema.
  • As you probably now realize, you cannot reproduce this effect with your home cinema or TV system because you don't have the two separately polarized images. TV's only give un-polarized light and home cinemas don't have the polarizers fitted either.
  • If you wanted to reproduce the effect at home, you would have to have both the left and right polarized images projected from separate sources, and since only the cinemas have access to them its very unlikely that you could replicate the system.
  • The above answer is correct for the recording process and discusses basically how 3D movies work, Real D which is what asked works as follows; Its nothing to do with the curvature of the screen sorry to say, the only impact the screen in the cinema has is how much light it reflects back to the eye. (IMAX screens have a silver reflective paint for example to make sure the ray of light are reflected straight and strong to your eye).
  • The reason why, much to my disappointment, you can't have 3D movies on your home TV is because of polarization, which is how the 3D thing works. The projector in the cinema projects alternate frames, each frame from a slightly different perspective to create the 3D stereoscopy. Basically each alternate frame uses a different circular polarization, L frame is clockwise, R frame is anti-clockwise. Those 3D glasses you use are also polarized, the left eye with a clockwise filter, the right with an anti clockwise filter. So the left eye only lets in frames frame one perspective and the right eye from the other.
  • So to answer you question, the reason why that doesn't work on your home TV, is because the TV can't produce polarized images, let alone alternating frames with different circular polarization attributes. So if you want 3D at home, either wait to purchase a 3D TV along with 3D blu-ray, use the dodgy red blue (found in Shrek and others), try out nvidia 3D vision or play around with existing 3D monitors like Zalman.

Related Questions

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Active 3D TVs use shutter glasses to send images to the left and right eye one at a time very rapidly. This can also cause the viewer to see flickering. Passive 3D TVs use polarized cinema 3D Glasses which sends the 3D image to the eyes simulaneously, allowing viewers to view 3D exactly how we view objects in real life. The glasses for active type 3D TVs are around $100-200 while the cinema 3D glasses for passive TVs are about $10 each.

Yes they do but not like the ones you get at the cinema(real D) The ones you get in store or online give you the red and blue filter glasses

Real images are inverted

Real drawings for that images they draw it for real and then put it on google

Real images are always inverted

just make them have light plastic and the outside you have them feel like real glasses and make them real on the outside.

Real D glasses are a technology called circular passive polarized glasses. The technology works be polarizing the light coming from the projector into different modes for each eye. This requires the projector to have what's called an "active polarizer" on the front of the projector which rapidly switches the light for each eye. 3D in your home on TVs used technology called active shutter glasses. What the manufactuers do is simply have LCDs on your glasses that open and close very rapidly and perform a similar technique to active polarizers on the projectors. The TV then simply just needs to have a really fast refresh rate to work with the glasses. That's why movie glasses are called "passive" (no battery) and 3D TV glasses are called "active" (battery operated). Its easier to manufacturer TVs like this than to try to attach and active polarizer to each display right now.

example of Real Images are the images seen on screen on cinema and image form in the human retina. also image produced on the camera. An example of a Virtual image is your image in a flat bathroom mirror. The light rays reflect away from the mirrors and do not actually pass through the image of yourself. The general rule of thumb to follow is: if the light rays ACTUALLY pass through the image, then it is a real image.

Cinema Bizarre's keyboard player's real name is Romeo Nightingale. His band name was Luminor.

The glasses worn by Daniel Radcliffe as Harry Potter in the movies, are 'real' in the fact that they are not CGI. They glasses are physically real, however they do not have lenses in the frames.

Only plane mirrors produce real images. I beleve this is right.

Yes. Real images can be projected onto a screen.

Google Images provide many images of real chicken farms, while Bing images provide a wide range of photos. However, on Bing images not all the images are relevant.

There are no Virtual Reality Glasses, but there are VR headsets.

There is no such thing as a mermaid and therefore there are no images of any.

There really is no difference between a cinema and a movie theater. The only real difference is the word itself. Depending on where you are, some people may refer to it as a cinema, while other people may refer to it as a movie theater. There really is no difference in meaning.

Nope! his vision is too perfect for glasses!(:

Real images can be obtained on the screen,whereas virtual images can't be obtained on the screen

Real time imaging refers to using a procedure which allows images to be captured in real time. In other words, like a movie as opposed to a still photograph.

Virtual images can't be captured anywhere. The imagescaptured on the retina are real ones.

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