The vehicle information may also be stored in the vehicle information base in the form of character, i.e., the vehicle information stored in the vehicle information base is text information. Correspondingly, when determining whether the extracted vehicle information is consistent with the standard vehicle information in the vehicle information base with the second identifier 3, the vehicle information extracted by the image obtainer 1 (i.e., vehicle information in the form of text) is directly matched in the vehicle information base, i.e., directly matches the characters. Directly matching the characters can realize fast and precise matching.

Step 25, determining whether the license plate of the vehicle is tampered according to the license plate number image and the preset standard license plate number image. If it is a tampered license plate, move to step 26; otherwise, the procedure is ended.