| 摘要 |
During use of equipment by a user having qualifications to use the equipment, an image of the user is continuously photographed by a video camera. When the face of the user can no longer be detected from the image acquired by the camera, warning is issued through voice and screen display and the photographing of an image and the detection of a face are continued. When the face of the user cannot be detected within a predetermined amount of time (e.g., 10 seconds), the equipment is locked.
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