Video capture hardware takes analog video input & turns it into digital image data
Video is a sequence of images
Full NTSC resolution is roughly 640x480, 30 frames/second
HD can be 1920x1080, 30 frames/second
Uses:
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Video interaction can use advanced computer vision algorithms,
or simpler hacks
Can use special tools, or user's body
Interaction without tools usually either detects motion, body silhouette, or body features (e.g. face)
Interaction may be focused on real world, or on user's image in video display
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