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Line alternate stereoscopic images
reformat the right and left images so that they are interleaved on a line-by-line
basis. Each line alternates between the right and left image. Many head
mounted displays (HMD's) use this format.
If your graphics card can support interlaced video modes (most cards can), then line alternate images can be used to achieve high-speed page-flipping with shutter glasses. Shutter glasses have high-speed electronic shutters (typically made with Liquid Crystal material) which open and close in sync with the images on the monitor. The advantage of using line alternate images with interlaced video is that the resulting 3D image is flicker free since very high scan rates can be reached. The image are in full color as with the page flipping method. Here is an example of using alternate images with interlaced video: 
Shutter glasses come in many forms. Some have wires which connect to your video card. Some connect to your serial port or parallel printer port. Some are wire-less and use special transmitters which send out infra-red pulses to the glasses. The VR Surfer from VRex is an example of a wireless pair of shutter glasses which supports line alternate methods. |
