| 摘要 |
An apparatus for measuring a moving state of a vehicle in a tunnel, in which traffic information such as number of vehicles which have passed, velocity, and the like can be always accurately measured without being influenced by changes in brightness in the tunnel. The measuring apparatus has an image pickup device installed in the tunnel and an image processing device for processing image data generated from the image pickup device. The apparatus further includes an input device for receiving a brightness/darkness signal which is changeable to adjust brightness of an illuminating apparatus installed in the tunnel, and adjusting device for adjusting an operation of the image pickup device or an operation of the image processing device in accordance with a change of the brightness/darkness signal, thereby preventing possible errors caused in the measurement.
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