| 摘要 |
A running vehicle is photographed at a predetermined frame period by an image pickup unit (TV camera) provided at a position above a road. Two images of a present frame image and a previous frame image which were photographed are successively stored in an image storing unit. A vehicle detecting unit detects a motion of a license plate in a head portion of the running vehicle on the basis of the present frame image and the previous frame image stored in the image storing unit. A character recognizing unit recognizes all of the characters on the license plate on the basis of a dictionary in which character images of all of the characters used for the license plate have been registered and an image in a license plate area detected by the vehicle detecting unit by collating with the character images registered in the dictionary.
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