Abstract: A keyboard printed on a flat surface and its use facilitated only by a single video camera and range imaging device is presented. The detection of the pressing of a key is accomplished via the combined use of the video camera and range imaging device as well as the correct communication between them and editing of the range image data. In addition, the use of a video camera allows the keyboard be moved while in use thanks to the existence of an additional fiducial marker printed on the flat surface. The keyboard can also be given an arbitrary shape, layout and key design and is not restricted to be printed on any one type of flat surface.