Alternate-frame sequencing

Alternate-frame squencing (sometimes called Alternate Image, or AI) is a method of showing 3-D film that is used in some venues.

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The movie is filmed with two cameras like most other 3-D films. Then the images are placed into a single strip of film in alternating order. In other words, there is the first left-eye image, then the corresponding right-eye image, then the next left-eye image, followed by the corresponding right-eye image and so on.

Related Topics:
Movie - Cameras - Film

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The film is then run at 48 frames-per-second instead of the traditional 24 frames-per-second. The audience wears very specialized LCD shutter glasses that have lenses that can open and close in rapid succession. The glasses also contain special radio receivers. The projection system has a transmitter that tells the glasses which eye to have open. The glasses switch eyes as the different frames come on the screen.

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This system is not generally used anymore in venues in favor of polarization. It is used, however, in home 3-D movie systems.

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