Ī proposed system called the P-ISM combines the technology with a small video projector to create a portable computer the size of a fountain pen. In 2002, start-up company Canesta developed a projection keyboard using their proprietary "electronic perception technology." The company subsequently licensed the technology to Celluon of Korea. Mechanical input units can be replaced by such virtual devices, potentially optimized for a specific application and for the user's physiology, maintaining speed, simplicity, and unambiguity of manual data input. In that way, it can emulate unlimited types of manually operated input devices (such as a mouse, keyboard, and other devices). It optically detects and analyses human hand and finger motions and interprets them as operations on a physically non-existent input device like a surface with painted or projected keys. An optical virtual keyboard was invented and patented by IBM engineers in 1992.
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