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That’s why these glasses are sometimes called “Shutter” glasses.įor this purpose LCD “lenses” are used. These type of glasses do require a power source (batteries) and the left and right lens are rapidly “opened” and “closed” while your TV rapidly alternates images for the left or right eye. Passive 3D glasses Active 3D Glasses – Switching imagesĪn alternative to the Polarization method is the use of Active 3D glasses which rapidly switching images on the screen while alternating the lens of the glasses one can see through. Filter means: to remove something unwanted. So a red filter will remove all red colors. Keep in mind that a filter removes the color it’s suppose to be filtering. The same happens for the left eye, but in this case anything in the red spectrum will not be visible.

The blue or cyan lens (right eye) will filter out anything in the blue spectrum – therefor anything in the blue spectrum will not be visible for the right eye. Then the image for one eye will then be converted to colors in the blue (cyan) spectrum, and the image for the other eye will be converted to colors in the red spectrum. Each of the two images is then converted to greyscale. In it’s basic form: Two pictures are taken under a slightly different angle. The trick for Anaglyph 3D is that we use two images, one for each eye. The big downside though is that it will not be able to see full color images since this method is based on filtering out certain colors. Therefor this method has been used in movie theaters and illustrations like comic books, etc. The advantage of Anaglyph 3D is that it works for both video and still images and it’s cheap to implement. This stereoscopic method is often referred to as Anaglyph. One of the earliest 3D illusions where achieved with the well known paper 3D glasses, with a red lens for one eye, and a blue (cyan) lens for the other eye.

Anaglyph – Old school Red and Blue 3D Glasses For example: you can’t walk to a different position and look behind an item, the items remain in the exact same perspective as they were from before you moved to a different position. They give the impression that you’re looking at 3D objects, but it’s really not 3D at all. If we now combine these 2 images in our brains, depth will be perceived.Īgain : The current methods for 3D display are only illusions. However when looking at object B, only with your right eye, you would see at least a part of object A behind object B. When looking at object B, only with the left eye, you would not see object A.

Yet each eye see a fraction that cannot be seen by the other eye (brighter areas). Simplified: Both eyes see the overlapping, darker, area. As you can see in the illustration above, under the assumption than an eye has roughly a 140 degree angle of view, we see how both viewable areas overlap yet under a slightly different angle.

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