Road signboard detection method and device

The invention relates to a road signboard detection method, which is carried out according to the following steps that: the step 1, a vehicle-mounted terminal is equipped with an intermittent light source and a camera, so that the intermittent light source and the camera face two sides of a road and can shoot a road signboard; the step 2, a camera respectively collects a plurality of road sign images with alternate brightness and darkness in an intermittent period; the step 3, frame difference calculation is performed on the image acquired by the camera; the step 4, an effective area of the image is determined; the step 5, target segmentation is performed on the image; and the step 6, target identification is carried out on the image, and road sign detection is completed. According to the invention, the intermittent light source is arranged on the vehicle-mounted terminal equipment, and after the camera collects the image, the traffic sign can be quickly positioned through a frame difference method, so that u