1. A system mounted on a powered industrial vehicle for detecting and classifying in real time at least one obstruction in the scene around the vehicle, the vehicle capable of moving in multiple directions, the system comprising: (a) a plurality of cameras mounted on the vehicle; and (b) a plurality of image processors operatively attached to each of said cameras, wherein said image processors each processes a plurality of image frames acquired respectively by said cameras, and when a pedestrian is present in the viewing zone viewed by one of said cameras, the image processor attached to said one camera identifies in at least one of the image frames at least a portion of an image of the detected pedestrian, thereby producing a detected pedestrian data object, and wherein said detected pedestrian data object is transferred from said one camera to another one of the cameras, thereby tracking the pedestrian.