Installed at the entrances and exits of military and police bases to optically collect vehicle bottom information of vehicles passing above, requiring high-resolution and high-definition capture to capture, quickly and accurately synthesize undistorted and complete vehicle bottom images, and image analysis software Discover and analyze abnormal conditions and report to the police to achieve the anti-hiding effect. Suitable for all types of vehicles with high and low chassis and length. It can also be equipped with an integrated human identification collection module, an intelligent anti-terrorism card punching module and a crossing guidance system to form an integrated smart crossing solution, and support secondary development, which can be docked with an internal smart security platform.