Imax Projection & Dome

When recording an IMAX 3D film will be recorded for each eye by two cameras per eye in an image distance

. The "IMAX 3D" process uses for the required separation in the image projection, the polarization technique to generate a three-dimensional color picture.

The film projection is carried out with linearly polarized light. Thereby, the polarization directions for the right and the left part of image is rotated 90 to each other. The viewer wears special 3D glasses , which provide turn by appropriate polarization filters that each eye only gets to see the corresponding sub-image. In the brain, this creates the impression of three-dimensional film. The image is on a silver screen projected as the conventional projection would destroy the polarization of light.

One advantage of the polarization filter technology, the manufacturing cost of 3D glasses and their easy handling. The polarizer can, however, by only a third of the available light. Therefore, very strong xenon lamps needed due to high heat (800 C operating temperature) must be continuously cooled with air and water. Another disadvantage is the strong angle dependence of the silver screen. For lateral viewing angle greater than about 20 , the image is only less than half as bright as compared with the frontal view. Viewers should also sit at the front of the screen projection centered as possible.

In contrast, some cinemas are shutter glasses used. In this technique the projector casts an image alternately for the left and the right eye on the big screen. The shutter glasses included for each eye, a thin LCD glass, which - in sync with the projector - only then will transmit light, even if the operation on the eye image is seen on the screen. This process is controlled by the same infrared signal transmitter above the canvas for all glasses. In order to prevent a headache ready end flickering of the image, left, every single picture can be shown four times, alternating with the matching right frame. Since the glasses contain active components, this technique is also referred to as "active" stereo projection, as opposed to "passive" polarization filter technology.

As the only working the IMAX cinema in the Transport Museum in Lucerne with the interference filter technology , used in both left and right eye each different wavelengths of light. The lenses have each only by the need for the right eye and blocking other wavelengths to the eye. The 3D digital projection takes place here, however, not with the "IMAX Digital" double-projector

IMAX Dome

The IMAX Dome System (formerly OMNIMAX), is characterized by a hemispherical screen with up to 21 m in diameter and up to 700 m from that in the horizontal plane 180 degrees in the vertical direction 122 (100 above the horizon of the beholder and 22 below) and thus covers the entire field of view of the viewer fills. Here, the film is through a dedicated camera with fisheye - wide-angle lens included, so that appears on the film strip, an oval, distorted, black bordered image. This black edge is in projection masked and distorted picture of the area by an appropriate wide-angle lens and equalizes the curved projection screen projected onto the screen. This system reinforced the feeling that they are too "in the film." Dizziness among viewers during rapid camera movements are not unusual.

See also the Omnivision process in 180-degree cinema since 1979 and its predecessor from 1958.

Meanwhile, some IMAX Dome-capable cinemas have started to project as "flat" IMAX films on the dome screen. This has a negative effect but the image quality, since distortion occurs in the image that will be stronger with increasing proximity to the edge of the canvas. As straight lines become curved toward the center of the screen. Occasionally, light blue and yellow are color fringing seen.

by: heena151211

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