US Patent 7934655 Input arrangement for controlling electronic device

An input arrangement for controlling an electronic device. The arrangement comprises a substrate have a position-coding pattern printed thereon. The position-coding pattern codes first and second sets of absolute positions on spatially separate areas of the substrate. The first and second sets of absolute positions are mutually exclusive and coded by first and second subsets of the position-coding pattern. A handheld image-recording device comprises an image sensor for recording images of the position-coding pattern a processor is configured for deriving an absolute position from the position-coding pattern in the recorded image and providing an instruction to the electronic device to perform a first function when the absolute position belongs to the first set and a second function when the absolute position belongs to the second set.