There are two common situations in height restriction scenes. One is artificially set height restriction devices, and the other is insufficient road clearance height caused by branches, eaves and other objects.
Height limit device is a common type of motor vehicle traffic restriction device on the road. Its general form is a horizontal height limit pole set up at a certain height above the road, or a height limit scene composed of viaducts and other facilities. Generally its geometric features are parallel to the road surface. However, non-artificial scenes such as tree branches, diagonal poles, and pipelines where road clearance is insufficient have variable shapes and diverse geometric features, making them difficult to summarize.
There are no unified standards for the shape, color, and material of height-limited obstacles, resulting in: 1) The image recognition of the monocular system relies on the sample library and classifier, and it is impossible to use visual recognition methods to detect height-limited obstacles; 2) Sensors such as laser and millimeter wave radar have poor reliability in detecting height limit poles.
Based on the binocular stereoscopic vision perception method, these problems can be effectively avoided and effective detection of height limit signs or obstacles can be achieved. Practice has proven that the binocular stereo vision system is good at judging thin and complex height-limited obstacles based on its dense 3D point cloud.
Smarter Eye was the first in China to launch a vehicle-mounted height limit detection system based on binocular stereo vision. Effectively detect collisions with various irregular height-limited obstacles (bridge openings, overpasses, tunnels, height-limited poles) to help car manufacturers improve user experience and reduce the probability of accidents.