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Imax 3D Technology
The term 'IMAX' comes from the words 'Image Maximum' and the IMAX Experience can be described as 'the most powerful and involving film experience possible'.
The difference between The IMAX Experience and watching a film at a conventional cinema is the feeling that you don't merely watch a film - you feel as if you are actually there - inside the human body, fighting for survival in Antarctica or plunging into the depths of the sea. The key to this experience is cinema's largest film frame, being projected by the world's most sophisticated projector onto a huge screen that encompasses the viewer's peripheral vision.
IMAX 3D technology is the most advanced 3D film technology in the world and is based on human vision. When you look at an object, each of your eyes sees a slightly different view. Through a process called "stereopsis" your brain brings the two views together into a single three dimensional image.
IMAX 3D cameras incorporate two identical lenses that are precisely spaced to match the distance between your eyes.
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This interocular distance allows each lens to "see" both left and right views exactly as your eyes would see them. This helps to facilitate realistic 3D images once projected.
During shooting, the images register on two separate rolls of 15/70 film that run through the camera at the same time and speed. IMAX 3D cameras weigh a hefty 240 pounds.
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3D Projector
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The IMAX 3D projector uses Rolling Loop technology to run two separate rolls of film simultaneously past twin projection lenses. To enable the 3D effect, the lenses are carefully aligned to project both left and right eye views onto the giant screen.
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To see images in 3D, the audience wears either polarized glasses or a headset that includes electronic liquid-crystal shutter (E3D) glasses. While they have different technologies, both types of 3D glasses work with the IMAX 3D projector to provide stunning 3D images.
To enable the 3D effect, polarized glasses worn by the audience are precisely matched with the polarizing filters of the projector's twin lenses. While the lenses superimpose separate left and right eye views onto the screen, the glasses make sure that each eye sees the appropriate image, allowing your brain to create a single 3D image.
Instead of superimposing images, two sets of shutters within the 3D projector switch back and forth at 96 times per second, to project alternate left and right eye images on the screen. During the presentation, E3D glasses sense a signal from the projector. In response to this signal, the left and right eye shutters in the glasses alternately open and close in conjunction with the projector shutters to make sure each eye sees the appropriate image, ultimately creating the 3D effect.
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To enable the 3D effect, polarized glasses worn by the audience are precisely matched with the polarizing filters of the projector's twin lenses. While the lenses superimpose separate left and right eye views onto the screen, the glasses make sure that each eye sees the appropriate image, allowing your brain to create a single 3D image.
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Projecting 3d Films
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There are several ways to project the dual images necessary to exhibit a 3D film; however, not all processes require two separate projectors. The anaglyphic film format simultaneously projects two different, offset images from one single strip of film. One image is coated with a green (or blue) colour, the other image is coated red. Spectators are given glasses that sort one green (or blue) lens and one red lens. The green lens of the glasses cancels out the red image on screen, while the red lens of the glasses cancel out the green (or blue) image on the screen. Your brain processes the two separated images as one 3D 'black and white' image!
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Previous methods placed two 35 mm frames in various configurations, either over and under each other or side by side. Today, when 3D films are shown through an IMAX projection system, two platters of film are used simultaneously, one for the right eye, and one for the left. First a right-eye image is projected onto the screen, then a left-eye image. First a right-eye image is projected onto the screen, then a left-eye image. Viewers wear special lightweight 3D glasses that cause each eye to see only the image intended for it, fooling your brain into believing objects are much closer than they really are.
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