Figure 5
The left panel labeled “(a)” shows the video data acquisition setup inside an elevator with metallic interior walls. A smartphone mounted on a small holder is attached to the wall and is labeled “Video Collector”, with its screen displaying a recording interface. Above the smartphone near the ceiling, a dome-shaped surveillance camera is visible. The surrounding surfaces appear metallic and reflective, forming the interior structure of the elevator cabin. The right panel labeled “(b)” shows the vibration data acquisition setup near the elevator doorway. The panel displays two metallic sliding door sections identified by the labels “Landing Door” on the left and “Car Door” on the right. Between the door panels, a small rectangular device labeled “Vibration sensor” is mounted vertically along the door frame. Thin annotation lines connect each label to the corresponding component, indicating the sensor placement and the positions of the two doors.Device acquisition diagram. Source(s): Figure created by authors