EP0494815A1 - Motor vehicles traffic measuring system - Google Patents

Motor vehicles traffic measuring system Download PDF

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Publication number
EP0494815A1
EP0494815A1 EP92400027A EP92400027A EP0494815A1 EP 0494815 A1 EP0494815 A1 EP 0494815A1 EP 92400027 A EP92400027 A EP 92400027A EP 92400027 A EP92400027 A EP 92400027A EP 0494815 A1 EP0494815 A1 EP 0494815A1
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EP
European Patent Office
Prior art keywords
vehicles
camera
measurement
infrared
trigger detector
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Granted
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EP92400027A
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German (de)
French (fr)
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EP0494815B1 (en
Inventor
Philippe Challe
Alain Sarignac
Gérard Barreault
Pascal Gucher
Gilles Defelix
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Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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Publication of EP0494815A1 publication Critical patent/EP0494815A1/en
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    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/01Detecting movement of traffic to be counted or controlled
    • G08G1/04Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/01Detecting movement of traffic to be counted or controlled
    • G08G1/052Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed

Definitions

  • the present invention relates to a system for measuring the traffic of motor vehicles on a traffic lane, comprising at least two measuring stations, spaced along said lane.
  • the present invention aims to achieve a device for measuring automobile traffic requiring no special equipment on motor vehicles.
  • each measurement station comprises a trigger detector operating by transmission / reception of a beam infra-red laser and providing a trigger signal for each reference vehicle, an infra-red light projector directing a beam on the vehicles in circulation and a camera whose shooting is triggered by the signal of the trigger detector and providing a video signal to an image analysis and data processing system that analyzes vehicle license plates to identify them and calculates vehicle travel time.
  • the measuring stations are located in height relative to the roadway, at the edge or above the track.
  • the projector consists of a discharge lamp associated with a reflector and an infrared filter, an electronic control unit and an electronic supply for the discharge lamp.
  • the trigger detector is constituted by a triangulation measurement system the transmitter of which is an infrared laser diode and the receiver of which is a photoelement associated with a lens fitted with an infrared filter and with a electronic detection of the signal received by reflection on the road or on vehicles.
  • the system comprises means of synchronization between the lightning of the infrared projector, the shooting by the CCD camera, acquisition and computer processing of images and arrival of the vehicle in the field of the camera.
  • the system according to the invention comprises two measuring stations A and B located along a traffic lane 1 and spaced apart from one another in the direction of traffic.
  • Each station comprises a shooting head 2 situated in height relative to the track, on the edge or above this track, integrating or associated with an image processing system 8.
  • Measuring stations A and B are located high above the road, at the edge or above the track.
  • Each shooting head 2 comprises a trigger detector 3, a light projector 4, and a CCD camera 5.
  • the trigger detector 3 has the function of detecting each vehicle 9 in the flow of traffic and triggering a shooting. It is placed next to camera 5 and observes the way in the same way as the camera.
  • the trigger detector 3 illustrated in FIG. 3 is based on a distance measurement by telemetry, thanks to the emission of an infrared laser beam modulated in amplitude and the detection by appropriate optics and electronics of the beam reflected by the roadway or a vehicle.
  • the trigger detector 3 operates on a triangulation principle. It is constituted by an infrared laser emitter 31 giving a focused beam 36 and amplitude modulated and by a light receiver 32 receiving the reflected beam 37 on the vehicle 5. The axes of the beams 36 and 37 make a non-zero angle between them.
  • the transmitter 31 consists of a laser diode.
  • the light receiver 32 is constituted by a lens 33, associated with a filter 35 and by a detector 34 constituted by a photodiode with two sensitive surfaces 341 and 342.
  • An electronics controls the laser diode and processes the signal coming from photodiode 34. Au rest, the reflected beam 37, reference 37 A in FIG.
  • the light projector 4 illustrated in FIG. 4 is of the infrared projector type. It comprises a discharge lamp 41 mounted on a support 42, a parabolic or spherical focusing reflector 43 and an infrared filter 44 associated with at least one lens.
  • This projector 4 emits a flash of light in the near infrared which is focused on the front of the vehicles by the reflector 43.
  • This emission of light is intended to compensate for a lack of light due to the nocturnal situations and the short time d integration of the measurement chain associated with the shooting head.
  • the emitted power is concentrated in space thanks to good focusing, and in time thanks to an impulse type emission. It also has the advantage of being almost completely invisible and therefore meets the criterion of discretion.
  • the lamp is controlled by an electronic assembly comprising a power electronics 45, a control electronics 46 and an interface electronics 47.
  • the camera 5 makes it possible to take the image of the front of the moving vehicles, detected by the trigger 3. Reading license plates requires precise image taking when the front of the vehicle is in the field of the camera.
  • Camera 5 is of the CCD type with electronic shutter. It has a low integration time and preferably works with frame transfer to obtain a better quality image.
  • the integration time time during which the image is formed on the CCD is low.
  • the camera includes a mechanical or optical shutter or an equivalent electronic function.
  • the video signal supplied by the camera 5 is sent by a link 61 to an image acquisition card 71 included in a microcomputer 8.
  • This card 71 is composed of an analog-digital converter, of one or more memory plans for image storage and possibly specialized processors providing part of the processing on the card.
  • the associated software includes a specific software for recognition of the number plates, which provides (if possible) an alphanumeric character string representing the number plate and an operating software which ensures the course of all the operations of taking pictures, detection and reading the license plate, communicating with the other station (s), or measuring and storing journey time (and other traffic information: vehicle counting, hourly statistics, etc.)
  • the projector 4, the detector 3 and the camera 5 are synchronized by a synchronization card 72 mounted in the microcomputer and connected by a link 62 to a synchronization circuit 63 of the shooting head connected to the various elements 4, 3, 5.
  • Other cards 73 and 74 respectively allow the optional connection with a screen-keyboard interface and inter-station communication.
  • the vehicle When the vehicle arrives near the station, it cuts off the infrared beam from the vehicle detector 3. The latter triggers the infra-red projector 4, the camera shoots 5 and acquires the image by the image analysis system. This identifies the vehicle by its registration number and enters the time of passage of the vehicle. It transmits this information to station B which stores it.
  • Travel time measurement systems can be implemented in a city no longer as a series of pairs of stations A and B but as a complete network.
  • the stations can be organized either in chain (figure. 6), each transmitting information to the next and receiving from the previous one, or in star (fig. 7) the information of each station being concentrated towards the same common system , or again any configuration associating these two modes of organization (fig. 8).

Abstract

System for measuring motor vehicle traffic on a route, comprising at least two measurement stations (A and B) spaced out along the said route, characterised in that each measurement station comprises a triggering detector (3) emitting an infrared laser beam and detecting the reflected beam, an infrared light projector (4) directing a beam onto the moving vehicles, a camera (5) whose shutter is controlled by the signal from the triggering detector (3) and supplying a video signal to an image analysis and data processing system (8) which analyses the registration plates of the vehicles in such a way as to identify them and calculates the transit time of the vehicles. <IMAGE>

Description

La presente invention se rapporte à un système de mesure du trafic de véhicules automobiles sur une voie de circulation, comportant au moins deux postes de mesure, espacés le long de ladite voie.The present invention relates to a system for measuring the traffic of motor vehicles on a traffic lane, comprising at least two measuring stations, spaced along said lane.

On cherche à obtenir des informations sur la circulation des automobiles. Le temps mis par un vehicule pour parcourir un tronçon de voie urbaine ou routière est le principal élément qui définit la "fluidité du trafic".We are looking for information on automobile traffic. The time taken by a vehicle to travel a stretch of urban or road lane is the main element that defines "traffic flow".

Actuellement on mesure le débit d'une voie à l'aide d'un compteur de véhicules (boucle magnétique placée dans la chaussée).Currently we measure the flow of a lane using a vehicle counter (magnetic loop placed in the roadway).

Il a été imaginé d'équiper une flotte de véhicules (dits véhicules traceurs) d'un dispositif de mesure et d'un dispositif de transmission de données vers des balises installées aux carrefours. Un pourcentage significatif (5 à 10 %) du parc automobile doit être équipe pour obtenir des informations valides du système ce qui impose un investissement initial élevé.It has been imagined to equip a fleet of vehicles (so-called tracer vehicles) with a measuring device and a device for transmitting data to beacons installed at crossroads. A significant percentage (5 to 10%) of the vehicle fleet must be equipped to obtain valid information from the system, which requires a high initial investment.

La présente invention a pour but de réaliser un dispositif de mesure de la cirulation automobile ne nécessitant aucun équipement spécial sur les véhicules automobiles.The present invention aims to achieve a device for measuring automobile traffic requiring no special equipment on motor vehicles.

Le système de mesure de trafic de véhicules automobiles selon l'invention est caractérisé par le fait que chaque poste de mesure comprend un détecteur de déclenchement fonctionnant par émission/réception d'un faisceau laser infra-rouge et fournissant un signal de déclenchement pour chaque véhicule repère, un projecteur de lumière infra-rouge dirigeant un faisceau sur les véhicules en circulation et une caméra dont la prise de vue est déclenchée par le signal du détecteur de déclenchement et fournissant un signal vidéo à un système d'analyse d'images et de traitement des données qui analyse les plaques d'immatriculation des véhicules afin de les identifier et calcule le temps de parcours des véhicules .The motor vehicle traffic measurement system according to the invention is characterized in that each measurement station comprises a trigger detector operating by transmission / reception of a beam infra-red laser and providing a trigger signal for each reference vehicle, an infra-red light projector directing a beam on the vehicles in circulation and a camera whose shooting is triggered by the signal of the trigger detector and providing a video signal to an image analysis and data processing system that analyzes vehicle license plates to identify them and calculates vehicle travel time.

Selon une caractéristique, les postes de mesure sont situés en hauteur par rapport à la chaussée, au bord ou au-dessus de la voie.According to one characteristic, the measuring stations are located in height relative to the roadway, at the edge or above the track.

Selon une caractéristique, le projecteur est constitué d'une lampe à décharge associée à un réflecteur et à un filtre infra-rouge, d'une électronique de commande et d'une électronique d'alimentation de la lampe à décharge.According to one characteristic, the projector consists of a discharge lamp associated with a reflector and an infrared filter, an electronic control unit and an electronic supply for the discharge lamp.

Selon une caractéristique, le détecteur de déclenchement est constitué par un système de mesure à triangulation dont l'émetteur est une diode laser infra-rouge et dont le récepteur est un photoélément associe à un objectif muni d'un filtre infra-rouge et à une électronique de détection du signal reçu par réflexion sur la chaussée ou sur les véhicules.According to one characteristic, the trigger detector is constituted by a triangulation measurement system the transmitter of which is an infrared laser diode and the receiver of which is a photoelement associated with a lens fitted with an infrared filter and with a electronic detection of the signal received by reflection on the road or on vehicles.

Selon une caractéristique, le système comporte des moyens de synchronisation entre l'éclair du projecteur infra-rouge, la prise de vue par la caméra CCD, l'acquisition et le traitement informatique des images et l'arrivée du véhicule dans le champ de la caméra.According to one characteristic, the system comprises means of synchronization between the lightning of the infrared projector, the shooting by the CCD camera, acquisition and computer processing of images and arrival of the vehicle in the field of the camera.

L'invention va maintenant être décrite avec plus de détails en se référant à un modèle de réalisation donne à titre d'exemple et représenté par les dessins annexes sur lesquels :

  • La figure 1 est une vue d'ensemble montrant les deux postes de mesure du système selon l'invention.
  • La figure 2 est un schéma synoptique d'une tête de prise de vues et du dispositif de traitement des formations associé .
  • La figure 3 est un schéma de principe du dispositif de détection automatique des véhicules équipant chaque poste de mesure.
  • La figure 4 est une vue de détail du capteur utilisé dans ce dispositif de détection.
  • La figure 5 est un schéma synoptique du projecteur d'éclairage équipant chaque poste de mesure.
  • La figure 6 est un schéma d'une disposition en chaîne de postes de mesure dans une ville.
  • La figure 7 est un schéma d'une disposition en étoile des postes de mesure dans une ville.
  • La figure 8 est un schéma d'une disposition en réseau multiple des postes de mesure dans une ville.
The invention will now be described in more detail with reference to an embodiment given by way of example and represented by the accompanying drawings in which:
  • Figure 1 is an overview showing the two measuring stations of the system according to the invention.
  • Figure 2 is a block diagram of a shooting head and the associated training processing device.
  • Figure 3 is a block diagram of the automatic detection device for vehicles fitted to each measurement station.
  • Figure 4 is a detailed view of the sensor used in this detection device.
  • Figure 5 is a block diagram of the lighting projector fitted to each measurement station.
  • FIG. 6 is a diagram of a chain arrangement of measurement stations in a city.
  • FIG. 7 is a diagram of a star arrangement of the measurement stations in a city.
  • Figure 8 is a diagram of a multiple network arrangement of measurement stations in a city.

Le système selon l'invention comprend deux postes de mesure A et B situés le long d'une voie de circulation 1 et espacés l'un par rapport à l'autre dans le sens de la circulation. Chaque poste comprend une tête de prise de vues 2 située en hauteur par rapport à la voie, sur le bord ou au-dessus de cette voie, intégrant ou associée à un système de traitement des images 8.The system according to the invention comprises two measuring stations A and B located along a traffic lane 1 and spaced apart from one another in the direction of traffic. Each station comprises a shooting head 2 situated in height relative to the track, on the edge or above this track, integrating or associated with an image processing system 8.

Les postes de mesure A et B sont situés en hauteur par rapport à la chaussée, au bord ou au-dessus de la voie.Measuring stations A and B are located high above the road, at the edge or above the track.

Chaque tête de prise de vues 2 comporte un détecteur de déclenchement 3, un projecteur de lumière 4, et une caméra CCD 5.Each shooting head 2 comprises a trigger detector 3, a light projector 4, and a CCD camera 5.

Le détecteur de déclenchement 3 a pour fonction de détecter chaque véhicule 9 dans le flot de la circulation et de déclencher une prise de vue. Il est placé à côté de la caméra 5 et observe la voie de la même façon que la caméra.The trigger detector 3 has the function of detecting each vehicle 9 in the flow of traffic and triggering a shooting. It is placed next to camera 5 and observes the way in the same way as the camera.

Le détecteur de déclenchement 3 illustré à la figure 3 est basé sur une mesure de distance par télémétrie, grâce à l'émission d'un faisceau laser infra-rouge module en amplitude et la détection par une optique et une électronique appropriées du faisceau réfléchi par la chaussée ou un véhicule.The trigger detector 3 illustrated in FIG. 3 is based on a distance measurement by telemetry, thanks to the emission of an infrared laser beam modulated in amplitude and the detection by appropriate optics and electronics of the beam reflected by the roadway or a vehicle.

Le détecteur de déclenchement 3 fonctionne selon un principe de triangulation. Il est constitué par un émetteur laser infra-rouge 31 donnant un faisceau 36 focalisé et modulé en amplitude et par un récepteur de lumière 32 recevant le faisceau réfléchi 37 sur le véhicule 5. Les axes des faisceaux 36 et 37 font un angle non nul entre eux. L'émetteur 31 est constitué par une diode laser. Le récepteur de lumière 32 est constitué par un objectif 33, associé à un filtre 35 et par un détecteur 34 constitué par une photodiode à deux surfaces sensibles 341 et 342. Une électronique pilote la diode laser et traite le signal issu de la photodiode 34. Au repos, le faisceau réfléchi 37, repère 37 A sur la figure 3 donne un spot lumineux qui est reparti également entre les deux surfaces sensibles 341 et 342 (figure 4a). Le système est alors à l'équilibre. Lorsqu'un véhicule 9 arrive, le faisceau repère 37 B sur la figure 3 se déplace. De ce fait la surface 341 ou 342 déséquilibre le système (figure 4 b) ce qui est détecté par l'électronique qui émet alors le signal de déclenchement.The trigger detector 3 operates on a triangulation principle. It is constituted by an infrared laser emitter 31 giving a focused beam 36 and amplitude modulated and by a light receiver 32 receiving the reflected beam 37 on the vehicle 5. The axes of the beams 36 and 37 make a non-zero angle between them. The transmitter 31 consists of a laser diode. The light receiver 32 is constituted by a lens 33, associated with a filter 35 and by a detector 34 constituted by a photodiode with two sensitive surfaces 341 and 342. An electronics controls the laser diode and processes the signal coming from photodiode 34. Au rest, the reflected beam 37, reference 37 A in FIG. 3 gives a light spot which is also distributed between the two sensitive surfaces 341 and 342 (FIG. 4a). The system is then in equilibrium. When a vehicle 9 arrives, the reference beam 37 B in FIG. 3 moves. As a result, the surface 341 or 342 unbalances the system (FIG. 4 b) which is detected by the electronics which then emits the trigger signal.

Le projecteur de lumière 4 illustre à la figure 4 est du type projecteur à infra-rouge. Il comprend une lampe à décharge 41 monte sur un support 42, un réflecteur parabolique ou sphérique de focalisation 43 et un filtre infra-rouge 44 associe à au moins une lentille. Ce projecteur 4 émet un éclair de lumière dans le proche infra-rouge qui est focalisé sur l'avant des véhicules par le réflecteur 43. Cette émission de lumière a pour but de pallier un manque de lumière dû aux situations nocturnes et au faible temps d'intégration de la chaîne de mesure associée à la tête de prise de vues. La puissance émise est concentrée dans l'espace grâce à une bonne focalisation, et dans le temps grâce à une émission de type impulsionnelle. Il a de plus l'avantage d'être presque totalement invisible et respecte donc le critère de discrétion. La lampe est commandée par un ensemble électronique comprenant une électronique de puissance 45, une électronique de commande 46 et une électronique d'interface 47.The light projector 4 illustrated in FIG. 4 is of the infrared projector type. It comprises a discharge lamp 41 mounted on a support 42, a parabolic or spherical focusing reflector 43 and an infrared filter 44 associated with at least one lens. This projector 4 emits a flash of light in the near infrared which is focused on the front of the vehicles by the reflector 43. This emission of light is intended to compensate for a lack of light due to the nocturnal situations and the short time d integration of the measurement chain associated with the shooting head. The emitted power is concentrated in space thanks to good focusing, and in time thanks to an impulse type emission. It also has the advantage of being almost completely invisible and therefore meets the criterion of discretion. The lamp is controlled by an electronic assembly comprising a power electronics 45, a control electronics 46 and an interface electronics 47.

La caméra 5 permet de prendre l'image de l'avant des véhicules en mouvement, détectés par le détecteur de déclenchement 3. La lecture de plaques minéralogiques nécessite une prise d'image précise lorsque l'avant du véhicule se présente dans le champ de la caméra.The camera 5 makes it possible to take the image of the front of the moving vehicles, detected by the trigger 3. Reading license plates requires precise image taking when the front of the vehicle is in the field of the camera.

La caméra 5 est de type CCD à obturateur électronique. Elle est à faible temps d'integration et fonctionne de préférence avec transfert de trame pour obtenir une image de meilleure qualité. Le temps d'intégration (temps pendant lequel l'image se forme sur le CCD) est faible. A cet effet, la caméra comporte un obturateur mécanique ou optique ou une fonction électronique équivalente.Camera 5 is of the CCD type with electronic shutter. It has a low integration time and preferably works with frame transfer to obtain a better quality image. The integration time (time during which the image is formed on the CCD) is low. To this end, the camera includes a mechanical or optical shutter or an equivalent electronic function.

Le signal vidéo fourni par la caméra 5 est envoyé par une liaison 61 à une carte d'acquisition d'images 71 incluse dans un micro-ordinateur 8. Cette carte 71 est composée d'un convertisseur analogique-numérique, d'un ou plusieurs plans mémoire pour le stockage des images et éventuellement de processeurs spécialisés assurant une partie du traitement sur la carte. Le logiciel associé comporte un logiciel spécifique de reconnaissance des plaques minéralogiques, qui fournit (si possible) une chaîne de caractères alphanumériques représentant la plaque minéralogique et un logiciel d'exploitation qui assure le déroulement de l'ensemble des opérations de prise de vues, détection et lecture de la plaque minéralogique, communication avec le (ou les) autre(s) poste(s),ou mesure et stockage du temps de parcours (et autres informations sur la circulation : comptage véhicules, statistiques horaires....)The video signal supplied by the camera 5 is sent by a link 61 to an image acquisition card 71 included in a microcomputer 8. This card 71 is composed of an analog-digital converter, of one or more memory plans for image storage and possibly specialized processors providing part of the processing on the card. The associated software includes a specific software for recognition of the number plates, which provides (if possible) an alphanumeric character string representing the number plate and an operating software which ensures the course of all the operations of taking pictures, detection and reading the license plate, communicating with the other station (s), or measuring and storing journey time (and other traffic information: vehicle counting, hourly statistics, etc.)

Le projecteur 4, le détecteur 3 et la caméra 5 sont synchronisés par une carte de synchronisation 72 montée dans le micro-ordinateur et relié par une liaison 62 à un circuit de synchronisation 63 de la tête de prise de vues relié aux différents éléments 4, 3, 5.The projector 4, the detector 3 and the camera 5 are synchronized by a synchronization card 72 mounted in the microcomputer and connected by a link 62 to a synchronization circuit 63 of the shooting head connected to the various elements 4, 3, 5.

D'autres cartes 73 et 74 permettent respectivement la liaison optionnelle avec un interface écran-clavier et la communication inter-postes.Other cards 73 and 74 respectively allow the optional connection with a screen-keyboard interface and inter-station communication.

Le fonctionnement du système est le suivant:The system works as follows:

A l'arrivée du véhicule près du poste à celui-ci coupe le faisceau infra-rouge du détecteur de véhicules 3. Ce dernier déclenche le projecteur infra-rouge 4, la prise de vue par la caméra 5 et l'acquisition de l'image par le système d'analyse d'images. Celui-ci identifie le véhicule par son numéro d'immatriculation et saisit l'heure de passage du véhicule. Il transmet ces informations au poste B qui les mémorise.When the vehicle arrives near the station, it cuts off the infrared beam from the vehicle detector 3. The latter triggers the infra-red projector 4, the camera shoots 5 and acquires the image by the image analysis system. This identifies the vehicle by its registration number and enters the time of passage of the vehicle. It transmits this information to station B which stores it.

Seule une partie du numéro minéralogique peut être lue ou communiquée entre les postes, tout en assurant une identification suffisante des véhicules dans le flot de la circulation.Only a part of the mineralogical number can be read or communicated between stations, while ensuring sufficient identification of the vehicles in the traffic flow.

D'autres informations saisies dans l'image prise par la caméra peuvent être associées au numéro d'immatriculation pour renforcer l'identification des véhicules.Other information entered in the image taken by the camera can be associated with the registration number to reinforce the identification of the vehicles.

Lors de l'arrivée du véhicule au poste B, les opérations précédentes se renouvellent. Le véhicule est ré-identifié par son numéro d'immatriculation et l'heure de passage est saisie. Le véhicule est alors recherché dans la liste mémorisée par le poste B, d'où il est extrait. On peut ainsi par différence des heures, mesurer le temps de parcours du véhicule et en déduire un temps de parcours moyen (par tranche horaire,...).When the vehicle arrives at station B, the previous operations are repeated. The vehicle is re-identified by its registration number and the time of passage is entered. The vehicle is then searched for in the list stored by station B, from which it is extracted. We can thus by difference of hours, measure the journey time of the vehicle and deduce an average journey time (by time slot, ...).

Il suffit de reconnaître au poste B une partie des véhicules détectés et identifiés au poste A pour mesurer le temps de parcours et donc la vitesse moyenne entre A et B.It is sufficient to recognize at station B part of the vehicles detected and identified at station A to measure the journey time and therefore the average speed between A and B.

Les systèmes de mesure de temps de parcours peuvent être implantés dans une ville non plus comme une série de couples de postes A et B mais comme un réseau complet. Dans ce cas les postes peuvent être organisés soit en chaîne (figure. 6), chacun transmettant des informations vers le suivant et en recevant du précédent, soit en étoile (fig. 7) les informations de chaque poste étant concentrées vers un même système commun, soit encore toute configuration associant ces deux modes d'organisation (fig. 8).Travel time measurement systems can be implemented in a city no longer as a series of pairs of stations A and B but as a complete network. In this case the stations can be organized either in chain (figure. 6), each transmitting information to the next and receiving from the previous one, or in star (fig. 7) the information of each station being concentrated towards the same common system , or again any configuration associating these two modes of organization (fig. 8).

Claims (6)

[1] Système de mesure du trafic de véhicules automobiles sur une voie de circulation, comportant au moins deux postes de mesure (A et B) espacés le long de ladite voie, caractérisé par le fait que chaque poste de mesure comprend un détecteur de déclenchement (3) émettant un faisceau laser infra-rouge et détectant le faisceau réfléchi, un projecteur de lumière infra-rouge (4) dirigeant un faisceau sur les véhicules en circulation, une caméra (5) dont la prise de vue est commandée par le signal du détecteur de déclenchement (3) et fournissant un signal vidéo à un système d'analyse d'images et de traitement de données (8) qui analyse les plaques d'immatriculation des véhicules de manière à les identifier et calcule les temps de parcours des véhicules. [1] Motor vehicle traffic measurement system on a traffic lane, comprising at least two measurement stations (A and B) spaced along said lane, characterized in that each measurement station comprises a trigger detector (3) emitting an infrared laser beam and detecting the reflected beam, an infra-red light projector (4) directing a beam on the vehicles in circulation, a camera (5) whose shooting is controlled by the signal from the trigger detector (3) and supplying a video signal to an image analysis and data processing system (8) which analyzes the license plates of the vehicles so as to identify them and calculates the travel times of the vehicles. [2] Système selon la revendication 1, caractérisé par le fait que les postes de mesure (A et B) sont situés en hauteur par rapport à la chaussée, au bord ou au-dessus de la voie. [2] System according to claim 1, characterized in that the measuring stations (A and B) are located in height relative to the road, at the edge or above the track. [3] Système selon la revendication 1 ou 2, caractérisé par le fait que le projecteur (4), déclenché par le détecteur de déclenchement (3), est constitué par une lampe à décharge (41) associée à un réflecteur (43) et à un filtre infra-rouge (44), d'une électronique de commande (45, 46, 47) et d'une électronique d'alimentation de la lampe à décharge. [3] System according to claim 1 or 2, characterized in that the projector (4), triggered by the trigger detector (3), is constituted by a discharge lamp (41) associated with a reflector (43) and an infrared filter (44), control electronics (45, 46, 47) and electronics for supplying the discharge lamp. [4] Système selon l'une quelconque des revendications précédentes, caractérisé par le fait que le détecteur de déclenchement (3) est constitué par un système de mesure à triangulation dont l'émetteur (31) est une diode laser infra-rouge et dont le récepteur (32) est un photoélément associé à un objectif muni d'un filtre infra-rouge et à une électronique de détection du signal reçu par réflexion sur la chaussée ou sur les véhicules. [4] System according to any one of the preceding claims, characterized in that the trigger detector (3) consists of a triangulation measurement system, the emitter (31) of which is an infrared laser diode and of which the receiver (32) is a photoelement associated with a lens fitted with an infrared filter and with electronics for detecting the signal received by reflection on the roadway or on vehicles. [5] Système selon l'une quelconque des revendications précédentes, caractérisé par le fait que la caméra (5) est une caméra de type CCD à obturateur électronique. [5] System according to any one of the preceding claims, characterized in that the camera (5) is a CCD type camera with electronic shutter. [6] Système selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'il comporte des moyens de synchronisation (72, 63) entre l'éclair du projecteur infra-rouge (4), la prise de vue par la caméra CCD (5), l'acquisition et le traitement informatique des images et l'arrivée du véhicule dans le champ de la caméra. [6] System according to any one of the preceding claims, characterized in that it comprises synchronization means (72, 63) between the flash of the infrared projector (4), the shooting by the camera CCD (5), the acquisition and computer processing of images and the arrival of the vehicle in the field of the camera.
EP19920400027 1991-01-11 1992-01-07 Motor vehicles traffic measuring system Expired - Lifetime EP0494815B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9100314 1991-01-11
FR9100314A FR2671653B1 (en) 1991-01-11 1991-01-11 MOTOR VEHICLE TRAFFIC MEASUREMENT SYSTEM.

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EP0494815A1 true EP0494815A1 (en) 1992-07-15
EP0494815B1 EP0494815B1 (en) 1996-12-18

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EP0625767A2 (en) * 1993-03-31 1994-11-23 Siemens Aktiengesellschaft Control system for checking fee payment for road users
AT402675B (en) * 1992-09-03 1997-07-25 Schweitzer Karl Ing DEVICE FOR MONITORING THE TRAFFIC DEVICE FOR MONITORING THE TRAFFIC OF MOTOR VEHICLES MOTOR VEHICLES
WO1998036398A1 (en) * 1997-02-12 1998-08-20 Trafficmaster Plc Methods and systems of monitoring traffic flow
NL1005785C2 (en) * 1997-04-10 1998-10-14 Traffic Test B V System for detecting vehicles overtaking in zone where overtaking is forbidden
EP0877253A1 (en) * 1997-05-07 1998-11-11 Münz, Erwin Optical speed detection device
NL1010490C2 (en) * 1997-11-10 1999-05-18 Nederland Haarlem B V Method of measuring average speed of a vehicle along length of road
EP0945840A2 (en) 1998-03-24 1999-09-29 John B. Moetteli Traffic law enforcement system
EP0947969A2 (en) * 1998-03-30 1999-10-06 Siemens Aktiengesellschaft Device for detection of vehicles, particularly to count the number of vehicles
EP0978811A2 (en) * 1998-08-07 2000-02-09 Siemens Aktiengesellschaft Method and device to obtain travel times of vehicles
WO2001035372A1 (en) * 1999-11-09 2001-05-17 C.R.A.F.T. S.R.L. System for surveillance of vehicular traffic on roads and highways
EP1276086A1 (en) * 2001-07-10 2003-01-15 Romolo Donnini System for monitoring and controlling the average speed of vehicles in transit, and surveying of traffic on roads and motorways
GB2425385A (en) * 2005-04-18 2006-10-25 Pips Technology Ltd Vehicle speed monitoring system
CN100351875C (en) * 2002-12-14 2007-11-28 三星Sds株式会社 Method and apparatus for determining advanicng-backing using local sensor and taking picture of vehicle driving against traffic regulations
US8218822B2 (en) 2007-05-14 2012-07-10 Pips Technology, Inc. Apparatus and method for recognizing the state of origin of a vehicle license plate
US10488492B2 (en) 2014-09-09 2019-11-26 Leddarttech Inc. Discretization of detection zone
USRE48914E1 (en) 2012-03-02 2022-02-01 Leddartech Inc. System and method for multipurpose traffic detection and characterization
USRE49342E1 (en) 2007-12-21 2022-12-20 Leddartech Inc. Distance detection method and system

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Cited By (25)

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Publication number Priority date Publication date Assignee Title
US5809161A (en) * 1992-03-20 1998-09-15 Commonwealth Scientific And Industrial Research Organisation Vehicle monitoring system
WO1993019441A1 (en) * 1992-03-20 1993-09-30 Commonwealth Scientific And Industrial Research Organisation An object monitoring system
AT402675B (en) * 1992-09-03 1997-07-25 Schweitzer Karl Ing DEVICE FOR MONITORING THE TRAFFIC DEVICE FOR MONITORING THE TRAFFIC OF MOTOR VEHICLES MOTOR VEHICLES
EP0625767A2 (en) * 1993-03-31 1994-11-23 Siemens Aktiengesellschaft Control system for checking fee payment for road users
EP0625767A3 (en) * 1993-03-31 1995-11-08 Siemens Ag Control system for checking fee payment for road users.
US6177886B1 (en) 1997-02-12 2001-01-23 Trafficmaster Plc Methods and systems of monitoring traffic flow
WO1998036398A1 (en) * 1997-02-12 1998-08-20 Trafficmaster Plc Methods and systems of monitoring traffic flow
NL1005785C2 (en) * 1997-04-10 1998-10-14 Traffic Test B V System for detecting vehicles overtaking in zone where overtaking is forbidden
EP0877253A1 (en) * 1997-05-07 1998-11-11 Münz, Erwin Optical speed detection device
NL1010490C2 (en) * 1997-11-10 1999-05-18 Nederland Haarlem B V Method of measuring average speed of a vehicle along length of road
EP0945840A2 (en) 1998-03-24 1999-09-29 John B. Moetteli Traffic law enforcement system
EP0947969A2 (en) * 1998-03-30 1999-10-06 Siemens Aktiengesellschaft Device for detection of vehicles, particularly to count the number of vehicles
EP0947969A3 (en) * 1998-03-30 2000-09-06 Siemens Aktiengesellschaft Device for detection of vehicles, particularly to count the number of vehicles
EP0978811A3 (en) * 1998-08-07 2000-08-16 Siemens Aktiengesellschaft Method and device to obtain travel times of vehicles
EP0978811A2 (en) * 1998-08-07 2000-02-09 Siemens Aktiengesellschaft Method and device to obtain travel times of vehicles
WO2001035372A1 (en) * 1999-11-09 2001-05-17 C.R.A.F.T. S.R.L. System for surveillance of vehicular traffic on roads and highways
EP1276086A1 (en) * 2001-07-10 2003-01-15 Romolo Donnini System for monitoring and controlling the average speed of vehicles in transit, and surveying of traffic on roads and motorways
CN100351875C (en) * 2002-12-14 2007-11-28 三星Sds株式会社 Method and apparatus for determining advanicng-backing using local sensor and taking picture of vehicle driving against traffic regulations
GB2425385A (en) * 2005-04-18 2006-10-25 Pips Technology Ltd Vehicle speed monitoring system
GB2425385B (en) * 2005-04-18 2007-08-01 Pips Technology Ltd Vehicle speed monitoring system
US8189048B2 (en) 2005-04-18 2012-05-29 Pips Technology Limited Vehicle speed monitoring system
US8218822B2 (en) 2007-05-14 2012-07-10 Pips Technology, Inc. Apparatus and method for recognizing the state of origin of a vehicle license plate
USRE49342E1 (en) 2007-12-21 2022-12-20 Leddartech Inc. Distance detection method and system
USRE48914E1 (en) 2012-03-02 2022-02-01 Leddartech Inc. System and method for multipurpose traffic detection and characterization
US10488492B2 (en) 2014-09-09 2019-11-26 Leddarttech Inc. Discretization of detection zone

Also Published As

Publication number Publication date
DE69215906T2 (en) 1997-06-05
DE69215906D1 (en) 1997-01-30
FR2671653A1 (en) 1992-07-17
FR2671653B1 (en) 1995-05-24
EP0494815B1 (en) 1996-12-18

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