However, wearable computers attempt to augment the user directly and provide a mobile platform while ubiquitous computing augments the surrounding physical environment with a network of machines and sensors. Both systems collect and organize data that is relevant to the human user for subsequent retrieval. It registers synthetic multimedia data acquired using a head-mounted video camera. However, information is retrieved explicitly by the user via speech commands. In addition, the machine vision algorithm used, was limited to 2D objects viewed from head-on and at appropriate distance.
Users view the real-world together with context sensitive information generated by the computer.
Users passively trigger the transmission of auditory cues as they move through their workplace. Faster, more natural and convenient means for users to exchange information with computers are needed.