Some aspects for the invention include a method and a structure including a light-emitting device disposed over a second crystalline semiconductor material formed over a semiconductor substrate comprising a first crystalline material. A semiconductor device has a top region of a second conductivity type, a deep region of the second conductivity type, and an intermediate region of a first conductivity type for isolating the top region and the deep region. The marker signal is appended to the image signal in accordance with the thus determined direction and the thus determined appending position of the marker signal. In this way, the computer is configured to periodically record data read from the RFID tags by the RFID detector.