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reacTIVision is a computer vision framework for the fast and robust tracking of markers attached on physical objects, and the creation of multi-touch surfaces. It was designed for the rapid development of table-based tangible user interfaces.
The purpose of the project is to allow a normal webcam to be used as a Human Interface Device (HID). Examples of how to use this software would be used are : mouse, control video games, electronic white board, or a replacement for a tabletpc.