Object tracking method, device and system

The invention discloses an object tracking method, device and system, and the method comprises the steps: obtaining a current frame image, carrying out the detection of the current frame image, determining a detection region of a first detection object in the current frame image, and determining a target region according to the detection region and an estimated region, wherein the target region is a region actually associated with the first detection object in the current frame image, and the pre-estimated region is a region, pre-estimated based on the historical frame image, of the second detection object in the current frame image. According to the scheme, on the basis of estimation of the second detection object in the historical frame image in the region of the current frame image and determination of the detection region of the first detection object in the current frame image, the actual association region of the first detection object in the current frame image is determined, therefore, the area where