1. A pedestrian tracking and counting method for a near-front top-view monitoring video, comprising: acquiring a video image under a current monitoring scene; comparing the video image with a background image, and when it is determined that the video image is a foreground image, segmenting and combining each blob in the foreground image to acquire a target blob representing an individual pedestrian; performing tracking and counting according to a centre-of-mass coordinate of each target blob in a detection area to acquire the number of pedestrians under the current monitoring scene.