| 摘要 |
PURPOSE:To measure a time taken in traveling of a vehicle, by arranging image sensors such as television cameras in plural observation positions and comparing and collating picture information of sampled vehicle numbers of vehicles passing through observation positions to obtain the matching of patterns of vehicle numbers. CONSTITUTION:An image sensor ISA is arranged 5m above the ground in the about center of one traffic lane at a position A. When the arrival of a vehicle C at a detecting line DL is detected on the picture, only a partial picture including a number plate NP is cut on the basis of detection information of the vehicle and is stored in a picture memory. A binary picture of the number plate is obtaind, and its binary luminance is processed with a slice level of the luminance in a processing device A3, and the picture subjected to the binary encoding processing is transmitted to a center M through a high-speed transmission line. Through the similar processing course, binary information of the number plate is transmitted from a position B to the center M for every arrival of a vehicle. In the center M, number plates are collated on the basis of picture information transmitted from positions A and B, and the time when the vehicle passing through the position A passes through the position B, and thus, a time taken in traveling of the vehicle C from the position A to the position B is measured. |
