| 摘要 |
LEDs are driven by pseudorandom number sequences unique to the LEDs, respectively, and emit light having light intensity change corresponding to their respective pseudorandom number sequences. The light from the LEDs enters a PSD. The PSD outputs currents having levels corresponding to intensity of bright spot images occurring at incident positions of the light and the incident positions. Matched filters subject the outputs of the PSD to correlation operation processing, thereby separate outputs corresponding to each LED, and then supply the outputs to a decoding circuit. The decoding circuit generates an output signal for each light source photographed, which signal comprises information on the position on a plane of incidence of the PSD and an identifying number of the light source. The positions of the LEDs are determined by using the output signal.
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