the second identifier is configured to determine whether a vehicle information contained in the vehicle image is consistent with a standard vehicle information in a vehicle information base, and to send a first identification command to the first identifier when the vehicle information contained in the vehicle image is not consistent with the standard vehicle information in the vehicle information base; and

the first identifier is configured to determine whether the license plate is tampered according to the received license plate number image and the preset standard license plate number image after receiving the first identification command.

The vehicle information and the standard vehicle information may include a license plate number, a color and a vehicle type; and

the second identifier is configured to send the first identification command to the first identifier when at least one of the color and the vehicle type of the vehicle information contained in the vehicle image is not consistent with the corresponding at least one of the color and the vehicle type in the standard vehicle information of the same license plate number in the vehicle information base.

The vehicle information base may store a standard vehicle image, and the second identifier is configured to match the vehicle image to the standard vehicle image in the vehicle information base.

The standard vehicle information in the vehicle information base may be text information;

the image obtainer is further configured to extract vehicle information in the form of text contained in the vehicle image according to the vehicle image, and send the vehicle information in the form of text contained in the vehicle image to the second identifier; and