摘要 |
PROBLEM TO BE SOLVED: To conduct a predetermined operation by well sensing a visitor without using a human body sensing sensor even when any entrance is installed without selecting installing conditions. SOLUTION: An infrared LED 4 is provided separately at a predetermined distance from a CCD 3b and a CCD 3b in an entrance unit 1, and an image processing unit 14 and a decision unit 15 are provided at a habitable room terminal 11. The LED 4 periodically emits a ray, calculates a difference between the image picked up at the LED 4 off time immediately before the emission and the image imaged at the emission time and specifies the position of a reflected ray arriving at the CCD 3a by reflecting on a matter to be reflected. A distance between the position of the specified ray and a center of an element of the CCD 3b is measured, and a distance between the matter to be reflected and the unit 1 is calculated by the processing unit 14. The calculated distance is compared with a preset reference distance by the decision unit 15, and if the calculated distance falls within the reference distance, it is determined that there is a visitor. COPYRIGHT: (C)2004,JPO
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