Method for detecting vehicle flow of multiple lanes on basis of video analysis

The invention relates to a method for detecting vehicle flow of multiple lanes on the basis of video analysis, and belongs to the field of acquisition of traffic parameters of intelligent traffic systems. The technical scheme includes that the method for detecting the vehicle flow of the multiple lanes on the basis of video analysis includes steps of building video background models; setting transverse main virtual detection lines, auxiliary virtual detection lines and longitudinal virtual detection lines in video backgrounds; preprocessing video; building background image models by the aid of Gaussian mixture background models and detecting vehicle targets; determining whether vehicles need to be counted or not, in other words, determining whether change of relations between the vehicle targets is available in image data of each local frame on the corresponding main virtual detection line and image data of a next frame or not, according to the background image models of front and rear frames when the moving