1. A method of detecting an incident on a portion of route ( 1 ) situated in a scene ( 2 ) when said portion of route is suitable for having objects traveling therealong, and when the method makes use of a video camera ( 3 ) having a target ( 4 ) constituting an optoelectronic converter of a real optical image of the scene, said target being controlled by a programmable processor member ( 6 ), the process for detecting incidents being suitable for being performed by activating said programmable processor member only while the real image ( 5 ) of the scene focused on the target ( 4 ) is stationary, the method being characterized in that it consists: in detecting the beginning of movement of the real image of the scene relative to the target; in deactivating the programmable processor member as soon as the real image of the scene begins to move relative to the target; in detecting the end of movement of the real image of the scene relative to the target; and in reactivating the programmable processor member at the end of the movement of the real image of the scene relative to the target in order to implement the process for detecting an incident.