Expressway thrown object detection method based on double backgrounds

The invention discloses an expressway thrown object detection method based on double backgrounds, and the method comprises the following steps: S1, carrying out the background modeling of an expressway monitoring video, and obtaining a background frame video; s2, subtracting the historical background frame from the current background frame in the background frame video to obtain a difference graph of the current background frame and the historical background frame; s3, performing mathematical morphology operation on the difference image to obtain a moving object in the background frame video; and S4, removing the moving objects which are too small and too large in area, too far away from the camera and not on the road surface from the obtained moving objects, judging the other moving objects as throwing objects, and marking the throwing objects in the picture. According to the invention, through background modeling, background frame subtraction and a series of condition judgment, the thrown object is detected