Abstract: The invention pertains to a supervision system which allows significant aid to be afforded to the operators of large road networks. Image sensors, autonomous from the electrical standpoint and comprising software for automatically detecting incidents, transmit alarms to a network management center by way of a wireless communication network. Swivelable cameras may be pointed at the alarm zones so as to perform zooms displayed on the screens of the operators of the center. The alarms are ranked by order of technical priority and then as a function of service quality criteria defined by the operator. They may be distributed into alarms requiring immediate action and other alarms. They can also be distributed into alarms for which an automatic action may be triggered and may suffice for the resolution of the incident and alarms requiring an operator action.

Abstract: Methods for calibrating at least two video cameras for a stereoscopic device includes: providing, on the lane portion, nine marks of hue other than that of the lane, sequenced on a first set of three concurrent virtual straight lines in a first point and distributed in specific manner on a second set of concurrent virtual straight lines in a second point; forming, with each of the cameras an image of the lane portion; defining, in each of the two images, one characteristic point of each mark image; determining, with the characteristic points, six concurrent straight line images respectively in two concurrent points; and processing the video signals delivered by each video camera such that the signals are representative of two images suitable for forming a stereoscopic video image. The method is useful for determining the occupancy condition of a lane portion and detecting incidents.

Abstract: Methods for calibrating at least two video cameras for a stereoscopic device includes: providing, on the lane portion, nine marks of hue other than that of the lane, sequenced on a first set of three concurrent virtual straight lines in a first point and distributed in specific manner on a second set of concurrent virtual straight lines in a second point; forming, with each of the cameras an image of the lane portion; defining, in each of the two images, one characteristic point of each mark image; determining, with the characteristic points, six concurrent straight line images respectively in two concurrent points; and processing the video signals delivered by each video camera such that the signals are representative of two images suitable for forming a stereoscopic video image. The method is useful for determining the occupancy condition of a lane portion and detecting incidents.