Ever wondered why the 3D glasses you get in the cinema, when you try watching a 3D image/video at home it doesn’t work? Here is the reason
Real D 3D movies work by projecting two copies of the movie on 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 human brain naturally combines two two-dimensional images into a single 3-dimensional scene, how that happens?
The right and left eye see a slightly different versions of the movie, each via a different perspective, just like it happens while viewing a real world scene. The can be produced by having different light polarizations for the left and the right eye. 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 and opposite for the right eye.
This won’t work with home TVs and Monitors because the monitor will not project 2 different images and even if it does it can’t polarize the light from each image so that it can be filtered byt the glass lenses.
The home/TV, 3D red/blue images use the same principal of filtering light for each eye but uses color as a filter instead of polarization, hence RealD 3D glasses don not work.
RealD 3D is a proprietary product belonging to RealD and the Theaters place a device that fits over the lens of their projector that projector shoots the image through REALD’S apparatus and then projects on the screen therefore without that apparatus you have no REALD 3D
The Cinema 3D glasses have a horizontally polarized filter in the left lens while a vertically polarized filter in the right, the left image is projected through a horizontal polarizer and the right image is projected through a vertical polarizer. These images have different perspective since they were recorded using a special camera with two lenses, one for the left and another for the right eye, the system then combines the image and produces a 3D effect, additionally the sound is also recorded in the same way to get the 3D sound effects too!
To get this effect at home you have to do what the Theaters do, reproduce the left and right polarizer images from a separate source, since only Cinemas have the access to it, it is very unlikely that you could replicate the system but it will definitely be a lot easier if you have a home theater system.