In one exemplary embodiment, an object region tracking and picturing module is constructed on a moving platform of a mobile end and a remote control module is constructed on anther platform for an image object region tracking system. The two modules communicate with each other via a digital network for delivering required information. The object region tracking and picturing module uses a real-time image backward search technology to store at least an image frame previously captured on the moving platform into a frame buffer, and start tracking an object region from the position pointed out by the remote control module to a newest image frame captured on the moving platform, then find out a relative position on the newest image frame for the tracked object region.