Monday, December 24, 2012

How 3D Glasses Work

As the cinematic experience radically changed from  Black & White to colour and the current 3D/4D/6D, so did the TVs n our home. 3D glasses are indispensable to enjoying 3D effect.


3D effect relies on creating an illusion of depth to the viewer. To understand what this means, watch your thumb with both your eyes, then close one eye while you keep watching with other one. Now close this eye and open the other one. Repeat this twice or thrice.You will se as if thumb is shifting back and forth. This back and forth distance basically arises due to the depth created in the visualising the thumb with different eyes.
Working of Red/Blue 3D glass
This simple phenomenon is the basis for developing 3D glasses. The movie screen actually displays two images. The glasses are designed to feed different images into our eyes. These let one of the images to enter one eye and the other to enter the other eye. This is achieved by either of two ways red/green or red/blue , and polarisation.

Red/Green or Red/Blue 3D glasses

In this system to produce the 3D effect, two images are displayed on the screen- one in red and the other in the green or blue. The colour filters on the glasses allow only one image to enter each eye. This leads depth to the image,making it appear 3D to our brain.  However image quality with this system is not as good as the polarised system. The reason is it somehow restricts some of the actual colours of the scene as it applies filtration y means of the colour itself.


This method uses differently polarised lenses to feed images into our eyes. The system consists of two synchronised projectors to project two respective view of an image, each with a different polarisation  The glasses have a pair of differently polarised filters at 90 degrees to each other  As each filters passes only that light which is similarly polarised and blocks the light polarised in the opposite direction, each eyes sees a different image. Thus two different images reach our eyes, creating a sense of  depth leading to a very high quality 3D effect.

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