| 摘要 |
A method is devised for the automatic detection of a human body. The method utilizes the near-infrared reflection bands of the skin of the human body as the identifying signature. Illumination of the body is provided by a near-infrared light source and the detection of the reflection bands, three in number, is performed by three detectors, each optically tuned to one of the reflection bands. When each of the three detectors simultaneously register a signal of the proper reflection values, a coincident trigger circuit enables an indicator device which signifies a human body is detected.
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