| 摘要 |
A technology to measure the position of a distant mark object and denote an automatic recognition data by the object. A light-emitting device includes an R (red) light, a G (green) light, and a B (blue) light emitters, and a control device for controlling their light-up states. The light-emitting device is affixed to the mark object and made to emit the lights by a predetermined light-emitting pattern. The light-emitting pattern forms a time-change optical recognition code denoting a desired data by change of the colors along the time axis. This optical recognition code is accomplished with a small area of space. Further, by photographing the light-emitting device with a CCD camera and the like, it is possible to recognize the position of the light-emitting device, that is, the position of the mark object. By carrying out this behavior continuously, it is possible to trace the movement of the mark object.
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