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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.
lees on line alternate methodsquished side by side method