Wearable camera systems give remote users a first-hand view of a local problem [Mann, 1994,Kraut et al., 1996,Baum et al., 1996]. Such ``over the shoulder'' telepresence has applications in repair and maintenance, medicine, courtroom proceedings, security, conferencing, and many other fields. Camera systems can also enable users with visual disabilities. When a wearable system has access to a digitizer and the CPU power to process the images, the camera becomes a sensor which can be integrated into the user interface itself. In addition, wearable computers enable a unique, first-person viewpoint for computer vision researchers concentrating on understanding human gesture and context.