| 摘要 |
<p>PURPOSE: To precisely detect vehicle without being influenced by shadow in respect to a vehicle detector in charge receiving system of toll road. CONSTITUTION: When a vehicle traveling on a road 6 enters a gantry 2, color marking 7 of red and green periodically drawn crossing lanes is picked up by a one-dimensional color image pickup machine 1 fixed to the gantry 2, its signal is inputted to a signal processor 5 through a cable 4 and the periodicity of the signal is checked based upon the light quantity signals of red and green and a reference signal. Since the periodicity of the color marking 7 is changed when a vehicle passes over the color marking 7, the entry, passage and width of the vehicle can be detected.</p> |
