EP1542191A1 - A moving vehicle identification method and system - Google Patents

A moving vehicle identification method and system Download PDF

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Publication number
EP1542191A1
EP1542191A1 EP04292606A EP04292606A EP1542191A1 EP 1542191 A1 EP1542191 A1 EP 1542191A1 EP 04292606 A EP04292606 A EP 04292606A EP 04292606 A EP04292606 A EP 04292606A EP 1542191 A1 EP1542191 A1 EP 1542191A1
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EP
European Patent Office
Prior art keywords
shooting
vehicle
optical device
attenuation
image
Prior art date
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Granted
Application number
EP04292606A
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German (de)
French (fr)
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EP1542191B1 (en
Inventor
Guillaume Batto
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Idemia Identity and Security France SAS
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Sagem SA
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
    • G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
    • G08G1/054—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed photographing overspeeding vehicles

Definitions

  • the present invention relates to the field of identifying a vehicle traveling on a road, or the like.
  • This identification is notably implemented in the field of control of traffic conditions, and mainly the speed of motor vehicles.
  • the identification of a vehicle usually includes at least identification of the vehicle registration number. Depending on the type of carried out, it may also include a number of elements additional information relating to the identification of specific features of that vehicle or to its occupants, generally relating to offenses committed by the driver or passengers, eg speeding, lack of safety belt, use of a mobile phone by the driver etc.
  • Offenses can be detected using devices such as a radar, a laser or a pair of pneumatic detectors in the case of speed control.
  • a camera is triggered after detection of the offense, to provide an image of the vehicle for reading the license plate and usually to see the driver's face (or another element in the passenger compartment representative of a possible offense: a laptop in the driver's ear, a seatbelt not put, etc.).
  • Document FR 2 797 081 describes a method and an apparatus identification of a registered motor vehicle for identification purposes of vehicles.
  • the method described is particularly suitable for the identification of vehicles equipped with retro reflective plates.
  • two photographs are taken successively, one with a flash of powerful flash to get a good picture of the driver's face through the windshield glass, the other with a less powerful flash of flash to get a good picture of the license plate.
  • the identification of registration number is thus achieved with the help of a specific photo, a another photo allowing the identification of the driver's face.
  • This technique requires two flashes of flash, so means, besides flash wear, an obligation to have two operations successive photography, so a processing capacity of vehicles in a given lower time.
  • the present invention aims at providing a method and a device identification of a vehicle traveling on a predetermined path which overcome the limitations of the techniques of the prior art.
  • the method according to the invention proposes an identification technique the registration of a vehicle that can be carried out automatically, regardless of the offense, and to reduce flash wear and processing time. Indeed, it allows with a single flash of flash to get a representation of the license plate and any element of the predetermined cabin located behind the windshield, in the cockpit.
  • a identification according to the invention can be carried out without the intervention of a operator to frame the photos.
  • the method according to the invention also makes it possible to carry out the identification vehicles with treated windshields, which in particular prevent the reflection in the direction of the means of shooting, signals in the spectral range of the near infrared.
  • the second means of shooting so that they selectively attenuate the intensity of the received signals belonging to the visible spectral band compared to that of the received signals belonging to the near infrared spectral band, with the added benefit of reducing shadows on the plate and therefore a better readability of it.
  • the attenuation is for example carried out at least with the aid of a filter located upstream of the second optical device, that is to say between the scene at photograph and the optical device.
  • Attenuation can be achieved using at least one filter located in the second optical device, and / or between the second device optical and the second sensor.
  • the attenuation is carried out at least by means of a transmitting filter mainly, if not exclusively, signals from the infrared domain close.
  • the first means of shooting so that they attenuate selectively the intensity of the received signals belonging to the spectral band near infrared compared to the received signals belonging to the band spectral visible.
  • the attenuation provided by the first means of shooting is performed for example at least using a filter located upstream of the first optical device, and / or at least with a filter located in the first optical device and / or between the first optical device and the first sensor.
  • the attenuation is carried out at least using a filter transmitting mainly or exclusively, signals from the visible domain.
  • At least one other setting parameters of at least one of the first and second shooting means comprising at least the sensitivity and / or exposure time and / or aperture and / or gain.
  • the invention proposes a system identification of vehicles traveling on a specified trajectory and comprising a conductor and a license plate, comprising means for implementing a method according to the first aspect of the invention.
  • the vehicle identification system may further comprise means transmission systems functionally associated with a transmission path of digital data, and clean, in the event of infringement found relating to a vehicle, to transmit digital data representative of the first and second shots made for said vehicle.
  • the vehicle identification system may comprise means to extract two shots taken for a vehicle, an image unique combination of both a representation of the license plate and a representation of the chosen element. This provision reduces the volume of data to be transmitted and / or manipulated, and may furthermore allow remove from the final image non-useful information to highlight infringement, for example breach of privacy (In particular we can remove the representation of the passenger).
  • the required flow defines the type and capacity of the link to use.
  • FIG. 1 is represented a radar 1, comprising an antenna radar 2 installed at the edge of a road 3, and controlled by a control unit of radar 4.
  • the radar 1 is for example a radar adapted to perform speed checks.
  • the radar is associated with a detection field corresponding to a beam of waves emitted by the antenna 2.
  • the radar 1 is connected to a device 8 for identifying vehicles in displacement arranged according to the invention.
  • the control unit 4 of the radar 1 transmits on this link signals to a control box 9 of the device 8.
  • the device 8 comprises a flash 17, comprising a light source 17a emitting in a spectral band comprising the visible range (wavelengths typically between 0.4 and 0.75 ⁇ m), and from the near infrared (wavelengths between 0.75 ⁇ m and 1.5 ⁇ m).
  • the flash 17 further comprises an optical device for projecting luminous flux 17b on the scene to photograph.
  • the device 8 comprises in a digital shooting system 7, such as a camera or video camera.
  • This system 7 has a optical device 7a and a sensor 7b of the CCD type ("Charge-Coupled Device") or CMOS ("Complementary Metal-Oxide Semiconductor”) or any other sensor.
  • the shooting system is suitable for shooting an image in the visible spectrum.
  • the device 8 further comprises a second camera system digital 10, such as a camera or a video camera type.
  • This system 10 comprises an optical device 10a and a sensor 10b of the CCD type ("Charge-Coupled Device") or CMOS ("Complementary Metal-Oxide Semiconductor) or any other sensor.
  • the shooting system is adapted to Shooting digital images in the near-infrared spectrum.
  • the flash 17 and the cameras 7 and 10 are in the case considered suitable for emitting illumination, respectively to capture images, on receipt of respective orders almost simultaneous in from the control box 9.
  • the orders come from an operator.
  • the device 8 comprises an image processing module 11 operating on images captured by the shooting systems 7 and 10.
  • the device 8 furthermore comprises a memory 12 making it possible to store images.
  • the device 8 also comprises a transmission block 13, which transmits data on a digital data transmission channel 14, to a national center for the exploitation of these data.
  • the communication link 14 may be a dedicated link, by fiber optical, by wired electrical conductor (connection type modem, ADSL or ethernet), via a radio link, or can be a public radio link GPRS or GSM type, adapted to the required transmission capacity and enabling a reduction in transmission and installation costs.
  • a predetermined location is defined L shooting a vehicle found in violation and traveling on the road 3.
  • the setting parameters of the shooting system 7 (axis aiming, zoom etc.) so that any shooting of a detected vehicle in the predetermined location L and obtained from the pickup system view 7 shows the face of the driver of the vehicle.
  • the setting parameters of the shooting system 10 (axis aiming, zoom etc.) so that any shooting of a detected vehicle in the predetermined location L and obtained from the pickup system view 10 shows the license plate of the vehicle.
  • P1 and P2 shots of a vehicle detected in position L obtained respectively by the camera system 7 and the camera system. in one embodiment shown in FIGS. 3.
  • the waves reflected by a vehicle 16 traveling on the road 3 and present in the detection field of the radar are picked up by the antenna 2 of the radar and analyzed in the control unit 4, which calculates the speed of the vehicle 16, and compares this calculated speed with a maximum speed allowed predefined.
  • the control unit 4 sends to the control box 9 of the device 8, a signal causing the sending from the housing 9, to the flash 17, a command illumination and sending almost simultaneous from the housing 9, to the systems of shooting 7 and 10, of respective commands of shooting and this with when the vehicle is in the determined shooting position L previously (this moment is determined by the housing 9 according to the estimated speed for the vehicle).
  • the time between the first command and the last command is a maximum of 15 ms.
  • the Shooting systems 7 and 10 each capture an image of the vehicle 16.
  • the image I1 captured by the shooting system 7 contains the face of the driver and the image I2 captured by the camera system 10 contains the numberplate. These images I1 and I2 are stored in the memory 12.
  • a method according to the invention thus allows with a single flash of flash to obtain an identification of the vehicle, including the representation of the license plate and that of the driver's face. According to the modes of realization, we will choose an element other than the driver's face and located behind the windshield, in the cockpit.
  • the shooting system 7 is particularly suitable for producing a shot of a windshield not returning infrared. Similarly the shooting system 7 is particularly suitable for making a take view of reflective plates mainly infrared.
  • the dimensions of the location area predetermined L or the accuracy of the detection of the presence of a vehicle in this area L can not guarantee that on an image taken by the system of shooting 7, it will not appear a part of plate registration, or that on an image taken by the system of grip from view 10, it will not appear a portion of the windshield.
  • a filter 18 can be disposed in the pickup system 10 upstream of the optical device 10a, reducing the intensity of the the visible spectral band.
  • the filter can transmit only the signals of the infrared spectral band.
  • a filter performing similar operations can in another mode in the optical device 10a or between the 10a optical device and the sensor 10b (it is in this case preferably placed on the sensitive area of the sensor 10b).
  • the filter in the shooting system 7 (inside or upstream of the optical device 10a, or between the optical device 7a and the sensor 7b) reducing the intensity of the signals of the infrared spectral band.
  • the filter can transmit exclusively the signals of the band spectral visible.
  • the processing module 11 is adapted to apply digital processing to I1 images and I2 relating to a vehicle 16 and stored in the memory 12.
  • This treatment makes it possible, for example, to isolate the plate image fraction F corresponding to the license plate on the image I2 supplied by the camera system 10, by referring to a base, also stored in memory 12, of models plate standards.
  • a character recognition program can then be applied to the F- plate image fraction.
  • This character recognition program provides N number of license estimated from the fraction F image plate, with a confidence score associated P N.
  • the module 11 applies for example a treatment digital image on the image 11 obtained by the shooting system 7, allowing to isolate the driver's face from the vehicle 16 (in one embodiment other, it can isolate the representation of the windshield of the vehicle and of what appear through it, or isolate the seat belt or the telephone portable hand held by the driver).
  • the set of digital data corresponding to the images I1 and 12, and / or the estimated registration number N with the associated confidence score P N , and / or to the image fractions F plate and F face , and to the Speed violation V are then selected and assembled, and then delivered by the control box 9 to the transmission block 13.
  • the image 11 may be sent with only the fraction F visible face (and the other parts of the image 11 hidden) to preserve private information (in particular, the passenger (s) can not be identified).
  • the image processing module 11 will be able to reconstruct a single image I from the images I1 and I2, providing the representation of both the driver's face and the license plate (this in order to reduce the volume of data to be transmitted while retaining relevant information).
  • the transmission block 13 compresses, shapes at least some of these data (depending on the chosen embodiment), then the sends, via the communication link 14, to the exploitation center 15.
  • the administrative operations for example: editing and recording the report infringement comprising the data sent by the transmission block 13, the amount of the fine corresponding to the infringement committed by the driver of the vehicle 16, determination of the driver's from the estimated number of the license plate and sending the statement infringement.
  • the number of data transmitted by way of transmission is thus limited and can be further reduced by compression techniques. Account given the image processing implemented according to the invention, the data numbers sent on the transmission channel (s) are very reduced, relevant and of good quality.
  • a method and system according to the invention provides a representation the number plate of a vehicle and the driver's face, only requires a flash of flash. They avoid obtaining images unusable in the prior art due to the characteristics of very different reflections of the various elements that can appear in the image. They are particularly suitable for the characteristics of strong reflection in infrared plate and low transmission of new windshields treated to prevent the passage of infrared rays in the passenger compartment and therefore overheating, this for the purpose of passenger comfort.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The method involves detecting a vehicle (16) situated in a predetermined position. A flash unit (17) and two digital photographic systems (7) e.g. video cameras, are simultaneously switched on, where the flash unit emits light in a visible spectral range. The systems provide two images of which one represents an image of a vehicle driver and another represents the number plate of the vehicle. An independent claim is also included for a system for identifying a moving vehicle.

Description

La présente invention concerne le domaine de l'identification d'un véhicule en déplacement sur une route, ou analogue.The present invention relates to the field of identifying a vehicle traveling on a road, or the like.

Cette identification est notamment mise en oeuvre dans le domaine du contrôle de conditions de circulation, et principalement de la vitesse de véhicules automobiles.This identification is notably implemented in the field of control of traffic conditions, and mainly the speed of motor vehicles.

L'identification d'un véhicule comprend en général au moins l'identification du numéro d'immatriculation du véhicule. Suivant le type de contrôle effectué, elle peut en outre comprendre un certain nombre d'éléments additionnels relatifs à l'identification de particularités propres dudit véhicule ou à ses occupants, en général relatives à des infractions commises par le conducteur ou les passagers, par exemple excès de vitesse, absence de ceinture de sécurité, utilisation d'un téléphone portable par le conducteur etc.The identification of a vehicle usually includes at least identification of the vehicle registration number. Depending on the type of carried out, it may also include a number of elements additional information relating to the identification of specific features of that vehicle or to its occupants, generally relating to offenses committed by the driver or passengers, eg speeding, lack of safety belt, use of a mobile phone by the driver etc.

La mise en évidence d'infractions peut s'effectuer à l'aide de dispositifs tels qu'un radar, d'un laser ou une paire de détecteurs pneumatiques dans le cas du contrôle de la vitesse.Offenses can be detected using devices such as a radar, a laser or a pair of pneumatic detectors in the case of speed control.

En général, en outre un appareil photographique est déclenché après détection de l'infraction, pour procurer une image du véhicule permettant de lire la plaque d'immatriculation et généralement de voir le visage du conducteur (ou encore un élément dans l'habitacle représentatif d'une infraction éventuelle : un portable à l'oreille du conducteur, une ceinture de sécurité non mise etc).In general, furthermore a camera is triggered after detection of the offense, to provide an image of the vehicle for reading the license plate and usually to see the driver's face (or another element in the passenger compartment representative of a possible offense: a laptop in the driver's ear, a seatbelt not put, etc.).

L'usage le plus répandu est qu'un opérateur, par exemple un gendarme, prenne une photographie du véhicule pratiquement de face ou sous une faible incidence.The most common use is that an operator, for example a policeman, take a photograph of the vehicle practically from the front or under low incidence

On connaít des solutions de l'art antérieur selon lesquelles on illuminait le véhicule à l'aide d'un unique éclair de flash et on obtenait sur une unique photographie le visage du conducteur et la plaque minéralogique.We know solutions of the prior art according to which we illuminated the vehicle using a single flash of lightning and we got on a single photograph the driver's face and the license plate.

Cette technique n'est plus satisfaisante à présent que les véhicules sont équipés de plaques rétro réfléchissantes, d'une part, et qu'on utilise des appareils de prise de vue numériques (et non plus des appareils à films argentiques), d'autre part. En effet, pour obtenir une image satisfaisante du visage du conducteur (ou plus généralement de tout élément choisi dans l'habitacle), il faut un éclair de flash puissant, capable de « traverser » le pare-brise. Cependant avec un tel éclair de flash, une plaque d'immatriculation rétro réfléchissante, dont le facteur de réflexion est très supérieur au facteur de réflexion des éléments dans l'habitacle, apparaít illisible sur la photo lorsque celle-ci est prise à l'aide d'un appareil numérique. Le numéro d'immatriculation ne peut donc être lu.This technique is no longer satisfactory now that vehicles are equipped with retro-reflective plates, on the one hand, and that digital cameras (and not film cameras filmstrips), on the other hand. Indeed, to obtain a satisfactory image of face of the driver (or more generally of any element chosen in interior), you need a powerful flash of flash, able to "cross" the windshield. However with such a flash of flash, a retro license plate reflective, whose reflection factor is much higher than the factor of reflection of the elements in the passenger compartment, appears illegible in the picture when it is taken using a digital device. The registration number can not be read.

Le clivage entre les caractéristiques optiques des deux zones d'intérêt particulier (plaque minéralogique et un élément situé derrière le pare-brise, dans l'habitacle) va encore s'intensifier avec le développement des pare-brises traités, qui en particulier empêchent la réflexion des signaux dans le domaine spectral du proche infrarouge.The cleavage between the optical characteristics of the two areas of interest particular (number plate and one element behind the windshield, in the cockpit) will further intensify with the development of windshields treated, which in particular prevent reflection of signals in the field near infrared spectral.

Le document FR 2 797 081 décrit un procédé et un appareil d'identification d'un véhicule automobile immatriculé permettant l'identification de véhicules. Le procédé décrit convient en particulier pour l'identification de véhicules équipés de plaques rétro réfléchissantes. Conformément à ce document, deux photos sont prises successivement, l'une avec un éclair de flash puissant pour obtenir une bonne image du visage du conducteur à travers la vitre du pare-brise, l'autre avec un éclair de flash moins puissant permettant d'obtenir une bonne image de la plaque d'immatriculation. L'identification du numéro d'immatriculation est ainsi réalisée à l'aide d'une photo spécifique, une autre photo permettant l'identification du visage du conducteur.Document FR 2 797 081 describes a method and an apparatus identification of a registered motor vehicle for identification purposes of vehicles. The method described is particularly suitable for the identification of vehicles equipped with retro reflective plates. In accordance with this document, two photographs are taken successively, one with a flash of powerful flash to get a good picture of the driver's face through the windshield glass, the other with a less powerful flash of flash to get a good picture of the license plate. The identification of registration number is thus achieved with the help of a specific photo, a another photo allowing the identification of the driver's face.

Cette technique nécessite deux éclairs de flash, donc signifie, outre une usure du flash, une obligation de devoir enchaíner deux opérations successives de prise de photographie, donc une capacité de traitement de véhicules en un temps donné plus faible.This technique requires two flashes of flash, so means, besides flash wear, an obligation to have two operations successive photography, so a processing capacity of vehicles in a given lower time.

Or, la systématisation des contrôles conduit à la généralisation de l'automatisation des systèmes de contrôle et d'identification, sans présence d'opérateurs, et des contraintes importantes sont données sur le nombre de véhicules traités en un temps donné.However, the systematisation of controls leads to the generalization of automation of control and identification systems, without presence operators, and significant constraints are given on the number of treated vehicles in a given time.

La présente invention vise à proposer un procédé et un dispositif d'identification d'un véhicule en déplacement sur une trajectoire prédéterminée qui pallient les limitations des techniques de l'art antérieur. The present invention aims at providing a method and a device identification of a vehicle traveling on a predetermined path which overcome the limitations of the techniques of the prior art.

Ainsi suivant un premier aspect, l'invention propose un procédé d'identification de véhicules en déplacement sur une trajectoire déterminée et comportant un conducteur dans un habitacle et une plaque minéralogique. Le procédé met en oeuvre des moyens d'illumination comprenant au moins une source lumineuse et un dispositif de projection du flux lumineux sur le véhicule. Le procédé met en oeuvre en outre des premiers et des seconds moyens de prise de vue. Les premiers moyens de prise de vue comportent au moins un premier dispositif optique et un premier capteur et les seconds moyens de prise de vue comportent au moins un second dispositif optique et un second capteur. Le procédé comprend dans une phase préparatoire, les étapes suivantes :

  • on définit une position prédéterminée de prise de vue de véhicules ;
  • on règle les premiers moyens de prise de vue de façon à inclure un élément choisi situé dans l'habitacle du véhicule dans une prise de vue de tout véhicule situé dans la susdite position prédéterminée et réalisée à l'aide des premiers moyens de prise de vue ;
  • on règle les seconds moyens de prise de vue de façon à inclure la plaque minéralogique dans une prise de vue de tout véhicule situé dans la susdite position prédéterminée et réalisée à l'aide des seconds moyens de prise de vue ;
  • on constitue les moyens d'illumination de manière à ce qu'ils émettent de la lumière à la fois dans le domaine visible et dans le domaine infrarouge proche ;
  • on constitue les premiers moyens de prise de vue de manière à ce que la bande passante spectrale desdits premiers moyens comprennent la bande spectrale visible ;
  • on constitue les seconds moyens de prise de vue de manière à ce que la bande passante spectrale desdits seconds moyens comprennent la bande spectrale infra-rouge proche ;
Thus according to a first aspect, the invention proposes a method for identifying vehicles traveling on a given trajectory and comprising a driver in a passenger compartment and a license plate. The method uses illumination means comprising at least one light source and a device for projecting the luminous flux onto the vehicle. The method also uses first and second means of shooting. The first camera means comprise at least a first optical device and a first sensor and the second camera means comprise at least a second optical device and a second sensor. The method comprises, in a preparatory phase, the following steps:
  • defining a predetermined position of shooting vehicles;
  • the first shooting means are adjusted so as to include a selected element located in the passenger compartment of the vehicle in a shooting of any vehicle situated in the aforesaid predetermined position and carried out using the first means of shooting ;
  • adjusting the second shooting means so as to include the license plate in a shooting of any vehicle located in the aforesaid predetermined position and carried out using the second means of shooting;
  • the illumination means are formed so that they emit light both in the visible range and in the near-infrared range;
  • the first shooting means are constituted so that the spectral bandwidth of said first means comprise the visible spectral band;
  • the second imaging means is constituted so that the spectral bandwidth of said second means comprise the near infra-red spectral band;

Dans une phase opératoire, le procédé comprend les étapes suivantes :

  • on détecte un véhicule situé dans la position prédéterminée ;
  • on déclenche de façon sensiblement simultanée les moyens d'illumination et les premiers et seconds moyens de prise de vue ;
  • on obtient une première image, fournie par les premiers moyens de prise de vue, d'au moins une partie du véhicule incluant une représentation de l'élément choisi et une seconde image, fournie par les seconds moyens de prise de vue, d'au moins une partie du véhicule incluant une représentation de la plaque minéralogique.
In an operating phase, the method comprises the following steps:
  • detecting a vehicle located in the predetermined position;
  • the illumination means and the first and second means of shooting are triggered substantially simultaneously;
  • a first image is obtained, provided by the first image-taking means, of at least a part of the vehicle including a representation of the chosen element and a second image, provided by the second image-taking means, of at least a portion of the vehicle including a representation of the license plate.

Ainsi le procédé selon l'invention propose une technique d'identification de l'immatriculation d'un véhicule pouvant être réalisée de façon automatique, quelle que soit l'infraction, et permettant de diminuer l'usure du flash et le temps de traitement. En effet, elle permet avec un seul éclair de flash d'obtenir une représentation de la plaque d'immatriculation et de tout élément de l'habitacle prédéterminé situé derrière le pare-brise, dans l'habitacle. Une identification selon l'invention peut être réalisée sans l'intervention d'un opérateur devant cadrer les photos.Thus the method according to the invention proposes an identification technique the registration of a vehicle that can be carried out automatically, regardless of the offense, and to reduce flash wear and processing time. Indeed, it allows with a single flash of flash to get a representation of the license plate and any element of the predetermined cabin located behind the windshield, in the cockpit. A identification according to the invention can be carried out without the intervention of a operator to frame the photos.

Le procédé selon l'invention permet en outre de réaliser l'identification de véhicules comportant des pare-brises traités, qui en particulier empêchent la réflexion en direction des moyens de prise de vue, des signaux dans le domaine spectral du proche infrarouge.The method according to the invention also makes it possible to carry out the identification vehicles with treated windshields, which in particular prevent the reflection in the direction of the means of shooting, signals in the spectral range of the near infrared.

Dans un mode de mise en oeuvre, on constitue les seconds moyens de prise de vue de manière à ce qu'ils atténuent sélectivement l'intensité des signaux reçus appartenant à la bande spectrale visible par rapport à celle des signaux reçus appartenant à la bande spectrale infrarouge proche, avec l'avantage supplémentaire d'une réduction des ombres portées sur la plaque et donc une meilleur lisibilité de celle-ci.In one mode of implementation, the second means of shooting so that they selectively attenuate the intensity of the received signals belonging to the visible spectral band compared to that of the received signals belonging to the near infrared spectral band, with the added benefit of reducing shadows on the plate and therefore a better readability of it.

L'atténuation est par exemple réalisée au moins à l'aide d'un filtre situé en amont du second dispositif optique, c'est-à-dire entre la scène à photographier et le dispositif optique.The attenuation is for example carried out at least with the aid of a filter located upstream of the second optical device, that is to say between the scene at photograph and the optical device.

Une atténuation peut être réalisée au moins à l'aide d'un filtre situé dans le second dispositif optique, et/ou encore entre le second dispositif optique et le second capteur.Attenuation can be achieved using at least one filter located in the second optical device, and / or between the second device optical and the second sensor.

Dans des modes de réalisation du procédé selon l'invention, l'atténuation est réalisée au moins à l'aide d'un filtre transmettant principalement, voire exclusivement, des signaux du domaine de l'infrarouge proche. In embodiments of the method according to the invention, the attenuation is carried out at least by means of a transmitting filter mainly, if not exclusively, signals from the infrared domain close.

Dans un mode de mise en oeuvre avantageux, on constitue les premiers moyens de prise de vue de manière à ce qu'ils atténuent sélectivement l'intensité des signaux reçus appartenant à la bande spectrale infrarouge proche par rapport à celle des signaux reçus appartenant à la bande spectrale visible.In an advantageous mode of implementation, the first means of shooting so that they attenuate selectively the intensity of the received signals belonging to the spectral band near infrared compared to the received signals belonging to the band spectral visible.

L'atténuation apportée par les premiers moyens de prise de vue est réalisée par exemple au moins à l'aide d'un filtre situé en amont du premier dispositif optique, et/ou au moins à l'aide d'un filtre situé dans le premier dispositif optique et/ou encore entre le premier dispositif optique et le premier capteur.The attenuation provided by the first means of shooting is performed for example at least using a filter located upstream of the first optical device, and / or at least with a filter located in the first optical device and / or between the first optical device and the first sensor.

Dans certains modes de mise en oeuvre du procédé, l'atténuation est réalisée au moins à l'aide d'un filtre transmettant principalement, voire exclusivement, des signaux du domaine du visible.In certain embodiments of the method, the attenuation is carried out at least using a filter transmitting mainly or exclusively, signals from the visible domain.

Avantageusement, on adapte de façon différente en outre au moins un des paramètres de réglage d'au moins des moyens choisis parmi les premiers et seconds moyens de prise de vue, lesdits paramètres comportant au moins la sensibilité et/ou le temps d'exposition et/ou l'ouverture et/ou le gain.Advantageously, at least one other setting parameters of at least one of the first and second shooting means, said parameters comprising at least the sensitivity and / or exposure time and / or aperture and / or gain.

Suivant un second aspect, l'invention propose un système d'identification de véhicules en déplacement sur une trajectoire déterminée et comportant un conducteur et une plaque minéralogique, comprenant des moyens pour mettre en oeuvre un procédé suivant le premier aspect de l'invention.According to a second aspect, the invention proposes a system identification of vehicles traveling on a specified trajectory and comprising a conductor and a license plate, comprising means for implementing a method according to the first aspect of the invention.

Afin d'accroítre la rapidité de traitement en cas d'infraction constatée, le système d'identification de véhicules peut en outre comporter des moyens de transmission fonctionnellement associés à une voie de transmission de données numériques, et propres, en cas d'infraction constatée relative à un véhicule, à transmettre des données numériques représentatives des première et seconde prises de vue réalisées pour ledit véhicule.In order to increase the speed of treatment in case of infringement, the vehicle identification system may further comprise means transmission systems functionally associated with a transmission path of digital data, and clean, in the event of infringement found relating to a vehicle, to transmit digital data representative of the first and second shots made for said vehicle.

Le système d'identification de véhicules peut comporter des moyens pour extraire des deux prises de vue réalisées pour un véhicule, une image unique comportant à la fois une représentation de la plaque minéralogique et une représentation de l'élément choisi. Cette disposition permet de réduire le volume de données à transmettre et/ou à manipuler, et peut en outre permettre de retirer de l'image finale des informations non utiles pour mettre en évidence l'infraction et portant par exemple atteinte au respect de la vie privée (notamment on peut retirer la représentation du passager). Le débit nécessaire définit le type et la capacité de la liaison à utiliser.The vehicle identification system may comprise means to extract two shots taken for a vehicle, an image unique combination of both a representation of the license plate and a representation of the chosen element. This provision reduces the volume of data to be transmitted and / or manipulated, and may furthermore allow remove from the final image non-useful information to highlight infringement, for example breach of privacy (In particular we can remove the representation of the passenger). The required flow defines the type and capacity of the link to use.

D'autres caractéristiques et avantages de l'invention apparaítront encore à la lecture de la description qui va suivre. Celle-ci est purement illustrative et doit être lue en regard des dessins annexés sur lesquels :

  • la figure 1 est un schéma de principe d'un système dans un mode de réalisation de l'invention ;
  • la figure 2 représente une prise de vue de véhicule réalisée par l'un des deux systèmes de prise de vues dans un mode de réalisation de l'invention ;
  • la figure 3 représente une prise de vue de véhicule réalisée par l'autre des deux systèmes de prise de vues dans un mode de réalisation de l'invention.
Other features and advantages of the invention will become apparent on reading the description which follows. This is purely illustrative and should be read in conjunction with the attached drawings in which:
  • Figure 1 is a block diagram of a system in one embodiment of the invention;
  • FIG. 2 represents a vehicle shot taken by one of the two camera systems in one embodiment of the invention;
  • FIG. 3 represents a vehicle shot taken by the other of the two camera systems in one embodiment of the invention.

Sur la figure 1 est représenté un radar 1, comportant une antenne radar 2 installée au bord d'une route 3, et piloté par une unité de commande de radar 4. Le radar 1 est par exemple un radar adapté pour effectuer des contrôles de vitesse.In FIG. 1 is represented a radar 1, comprising an antenna radar 2 installed at the edge of a road 3, and controlled by a control unit of radar 4. The radar 1 is for example a radar adapted to perform speed checks.

Le radar est associé à un champ de détection correspondant à un faisceau d'ondes émises par l'antenne 2.The radar is associated with a detection field corresponding to a beam of waves emitted by the antenna 2.

Le radar 1 est relié à un dispositif 8 d'identification de véhicules en déplacement agencé selon l'invention. L'unité de commande 4 du radar 1 émet sur cette liaison des signaux à destination d'un boítier de commande 9 du dispositif 8.The radar 1 is connected to a device 8 for identifying vehicles in displacement arranged according to the invention. The control unit 4 of the radar 1 transmits on this link signals to a control box 9 of the device 8.

Le dispositif 8 comporte un flash 17, comportant une source lumineuse 17a émettant dans une bande spectrale comprenant le domaine du visible (longueurs d'onde comprises typiquement entre 0,4 et 0,75 µm), et du proche infrarouge (longueurs d'onde comprises entre 0,75 µm et 1,5 µm). Le flash 17 comprend en outre un dispositif optique de projection de flux lumineux 17b sur la scène à photographier.The device 8 comprises a flash 17, comprising a light source 17a emitting in a spectral band comprising the visible range (wavelengths typically between 0.4 and 0.75 μm), and from the near infrared (wavelengths between 0.75 μm and 1.5 μm). The flash 17 further comprises an optical device for projecting luminous flux 17b on the scene to photograph.

Le dispositif 8 comporte en un système de prise de vue numérique 7, tel un appareil photo ou une caméra de type vidéo. Ce système 7 comporte un dispositif optique 7a et un capteur 7b du type CCD ("Charge-Coupled Device") ou CMOS ("Complementary Metal-Oxyde Semiconductor) ou tout autre capteur. Le système de prise de vue est adapté à la prise de vue d'image numérique dans le spectre visible.The device 8 comprises in a digital shooting system 7, such as a camera or video camera. This system 7 has a optical device 7a and a sensor 7b of the CCD type ("Charge-Coupled Device") or CMOS ("Complementary Metal-Oxide Semiconductor") or any other sensor. The shooting system is suitable for shooting an image in the visible spectrum.

Le dispositif 8 comporte en outre un second système de prise de vue numérique 10, tel un appareil photo ou une caméra de type vidéo. Ce système 10 comporte un dispositif optique 10a et un capteur 10b du type CCD ("Charge-Coupled Device") ou CMOS ("Complementary Metal-Oxyde Semiconductor) ou tout autre capteur. Le système de prise de vue est adapté à la prise de vue d'images numériques dans le spectre proche infrarouge.The device 8 further comprises a second camera system digital 10, such as a camera or a video camera type. This system 10 comprises an optical device 10a and a sensor 10b of the CCD type ("Charge-Coupled Device") or CMOS ("Complementary Metal-Oxide Semiconductor) or any other sensor. The shooting system is adapted to Shooting digital images in the near-infrared spectrum.

Le flash 17 et les systèmes de prise de vues 7 et 10 sont dans le cas considéré adaptés pour émettre une illumination, respectivement capturer des images, sur réception de commandes respectives quasi simultanées en provenance du boítier de commande 9. Dans un mode de réalisation différent, les commandes proviennent d'un opérateur.The flash 17 and the cameras 7 and 10 are in the case considered suitable for emitting illumination, respectively to capture images, on receipt of respective orders almost simultaneous in from the control box 9. In a different embodiment, the orders come from an operator.

Le dispositif 8 comporte un module de traitement d'images 11 opérant sur des images capturées par les systèmes de prise de vue 7 et10.The device 8 comprises an image processing module 11 operating on images captured by the shooting systems 7 and 10.

Le dispositif 8 comporte en outre une mémoire 12 permettant de stocker des images.The device 8 furthermore comprises a memory 12 making it possible to store images.

Le dispositif 8 comprend également un bloc de transmission 13, qui transmet des données sur une voie de transmission de données numériques 14, à destination d'un centre national d'exploitation 15 de ces données.The device 8 also comprises a transmission block 13, which transmits data on a digital data transmission channel 14, to a national center for the exploitation of these data.

La liaison de communication 14 peut être une liaison dédiée, par fibre optique, par conducteur électrique filaire (liaison de type modem, ADSL ou ethernet), via un faisceau hertzien, ou peut être une liaison radio grand public de type GPRS ou GSM, adaptée à la capacité de transmission nécessaire et permettant une réduction des coûts de transmission et d'installation.The communication link 14 may be a dedicated link, by fiber optical, by wired electrical conductor (connection type modem, ADSL or ethernet), via a radio link, or can be a public radio link GPRS or GSM type, adapted to the required transmission capacity and enabling a reduction in transmission and installation costs.

Dans une phase préparatoire, on définit une localisation prédéterminée L de prise de vue d'un véhicule constaté en infraction et circulant sur la route 3.In a preparatory phase, a predetermined location is defined L shooting a vehicle found in violation and traveling on the road 3.

On fixe les paramètres de réglage du système de prise de vue 7 (axe de visée, zoom etc) de façon à ce que toute prise de vue d'un véhicule détecté dans la localisation prédéterminée L et obtenue à partir du système de prise de vue 7 fasse apparaítre le visage du conducteur du véhicule. The setting parameters of the shooting system 7 (axis aiming, zoom etc.) so that any shooting of a detected vehicle in the predetermined location L and obtained from the pickup system view 7 shows the face of the driver of the vehicle.

On fixe les paramètres de réglage du système de prise de vue 10 (axe de visée, zoom etc) de façon à ce que toute prise de vue d'un véhicule détecté dans la localisation prédéterminée L et obtenue à partir du système de prise de vue 10 fasse apparaítre la plaque d'immatriculation du véhicule.The setting parameters of the shooting system 10 (axis aiming, zoom etc.) so that any shooting of a detected vehicle in the predetermined location L and obtained from the pickup system view 10 shows the license plate of the vehicle.

Les prises de vue P1 et P2 d'un véhicule détecté en position L obtenues respectivement par le système de prise de vue 7 et par le système de prise de vue 10 sont dans un mode de réalisation représentées en figures 2 et 3.P1 and P2 shots of a vehicle detected in position L obtained respectively by the camera system 7 and the camera system. in one embodiment shown in FIGS. 3.

Les ondes réfléchies par un véhicule 16 circulant sur la route 3 et présent dans le champ de détection du radar sont captées par l'antenne 2 du radar et analysées dans l'unité de commande 4, qui calcule la vitesse du véhicule 16, et compare cette vitesse calculée avec une vitesse maximale autorisée prédéfinie.The waves reflected by a vehicle 16 traveling on the road 3 and present in the detection field of the radar are picked up by the antenna 2 of the radar and analyzed in the control unit 4, which calculates the speed of the vehicle 16, and compares this calculated speed with a maximum speed allowed predefined.

Lorsqu'une infraction de vitesse est observée, l'unité de commande 4 envoie à destination du boítier de commande 9 du dispositif 8, un signal provoquant l'envoi depuis le boítier 9, vers le flash 17, d'une commande d'illumination et l'envoi quasi-simultané depuis le boítier 9, vers les systèmes de prise de vue 7 et 10, de commandes respectives de prise de vue et ce au moment où le véhicule se trouve en position L de prise de vue déterminée précédemment (ce moment est déterminé par le boítier 9 en fonction de la vitesse estimée pour le véhicule). Par exemple le délai entre la première commande et la dernière commande est au maximum de 15 ms.When a speed violation is observed, the control unit 4 sends to the control box 9 of the device 8, a signal causing the sending from the housing 9, to the flash 17, a command illumination and sending almost simultaneous from the housing 9, to the systems of shooting 7 and 10, of respective commands of shooting and this with when the vehicle is in the determined shooting position L previously (this moment is determined by the housing 9 according to the estimated speed for the vehicle). For example the time between the first command and the last command is a maximum of 15 ms.

Dès réception de ces commandes, un flash unique est émis et les systèmes de prise de vues 7 et 10 capturent chacune une image du véhicule 16. L'image I1 capturée par le système de prise de vue 7 contient le visage du conducteur et l'image I2 capturée par le système de prise de vue 10 contient la plaque d'immatriculation. Ces images I1 et I2 sont stockées dans la mémoire 12.Upon receipt of these commands, a single flash is issued and the Shooting systems 7 and 10 each capture an image of the vehicle 16. The image I1 captured by the shooting system 7 contains the face of the driver and the image I2 captured by the camera system 10 contains the numberplate. These images I1 and I2 are stored in the memory 12.

Un procédé selon l'invention permet ainsi avec un seul éclair de flash d'obtenir une identification du véhicule, comportant la représentation de la plaque d'immatriculation et celle du visage du conducteur. Selon les modes de réalisation, on choisira un élément autre que le visage du conducteur et localisé derrière le pare-brise, dans l'habitacle. A method according to the invention thus allows with a single flash of flash to obtain an identification of the vehicle, including the representation of the license plate and that of the driver's face. According to the modes of realization, we will choose an element other than the driver's face and located behind the windshield, in the cockpit.

Le système de prise de vue 7 convient particulièrement pour réaliser une prise de vue d'un pare-brise ne renvoyant pas les infrarouges. De même le système de prise de vue 7 convient particulièrement pour réaliser une prise de vue de plaques réfléchissant principalement les infrarouges.The shooting system 7 is particularly suitable for producing a shot of a windshield not returning infrared. Similarly the shooting system 7 is particularly suitable for making a take view of reflective plates mainly infrared.

Dans certains cas, les dimensions de la zone de localisation prédéterminée L ou encore la précision de la détection de la présence d'un véhicule dans cette zone L ne permettent pas de garantir que sur une image prise par le système de prise de vue 7, il n'apparaítra pas une partie de plaque d'immatriculation, ou encore que sur une image prise par le système de prise de vue 10, il n'apparaítra pas une portion du pare-brise.In some cases, the dimensions of the location area predetermined L or the accuracy of the detection of the presence of a vehicle in this area L can not guarantee that on an image taken by the system of shooting 7, it will not appear a part of plate registration, or that on an image taken by the system of grip from view 10, it will not appear a portion of the windshield.

Afin d'éviter les phénomènes de saturation du capteur du système de prise de vue 7 ou du capteur du système de prise de vue 8, on pourra adapter les sensibilités, les temps d'exposition, les ouvertures et/ou les gains respectifs de chaque système de prise de vue pour que sur toute image prise par le système de prise de vue 7, la représentation du visage du conducteur soit exploitable (même si la représentation de la plaque d'immatriculation ne l'est pas), et que réciproquement toute image prise par le système de prise de vue 10, la représentation de la plaque d'immatriculation soit exploitable (même si la représentation du visage du conducteur ne l'est pas).In order to avoid the phenomena of saturation of the sensor of the system of shooting 7 or the sensor of the shooting system 8, we can adapt sensitivities, exposure times, openings and / or respective gains of each shooting system so that on any image taken by the system 7, the representation of the driver's face is exploitable (even if the representation of the license plate is not not), and conversely any image taken by the system of shooting 10, the representation of the license plate is exploitable (even if the representation of the driver's face is not).

Par ailleurs, dans un mode de réalisation, on peut en outre atténuer, voire ne pas transmettre du tout, certaines bandes spectrales in fine aux capteurs respectifs des systèmes de prise de vues.Moreover, in one embodiment, it is also possible to attenuate not even transmit at all, some spectral bands in fine to respective sensors of the camera systems.

Par exemple, on peut disposer un filtre 18 dans le système de prise de vue 10 en amont du dispositif optique 10a, réduisant l'intensité des signaux de la bande spectrale visible. Dans un mode de réalisation, le filtre peut transmettre exclusivement les signaux de la bande spectrale infrarouge.For example, a filter 18 can be disposed in the pickup system 10 upstream of the optical device 10a, reducing the intensity of the the visible spectral band. In one embodiment, the filter can transmit only the signals of the infrared spectral band.

Un filtre effectuant des opérations similaires peut dans un autre mode de réalisation être disposé dans le dispositif optique 10a ou encore entre le dispositif optique 10a et le capteur 10b (il est dans ce cas de préférence placé sur la zone sensible du capteur 10b).A filter performing similar operations can in another mode in the optical device 10a or between the 10a optical device and the sensor 10b (it is in this case preferably placed on the sensitive area of the sensor 10b).

Dans un mode de réalisation, on peut en outre disposer un filtre dans le système de prise de vue 7 (à l'intérieur ou en amont du dispositif optique 10a, ou encore entre le dispositif optique 7a et le capteur 7b) réduisant l'intensité des signaux de la bande spectrale infrarouge. Dans un mode de réalisation, le filtre peut transmettre exclusivement les signaux de la bande spectrale visible.In one embodiment, it is also possible to have a filter in the shooting system 7 (inside or upstream of the optical device 10a, or between the optical device 7a and the sensor 7b) reducing the intensity of the signals of the infrared spectral band. In a mode of realization, the filter can transmit exclusively the signals of the band spectral visible.

Dans un mode de réalisation de l'invention, le module de traitement d'images 11 est adapté pour appliquer un traitement numérique aux images I1 et I2 relatives à un véhicule 16 et stockées dans la mémoire 12.In one embodiment of the invention, the processing module 11 is adapted to apply digital processing to I1 images and I2 relating to a vehicle 16 and stored in the memory 12.

Ce traitement permet par exemple d'isoler la fraction d'image Fplaque correspondant à la plaque minéralogique sur l'image I2 fournie par le système de prise de vue 10, en se référant à une base, également stockée en mémoire 12, de modèles standards de plaques.This treatment makes it possible, for example, to isolate the plate image fraction F corresponding to the license plate on the image I2 supplied by the camera system 10, by referring to a base, also stored in memory 12, of models plate standards.

Dans un mode de réalisation de l'invention, un programme de reconnaissance de caractères peut ensuite être appliqué sur la fraction d'image Fplaque. Ce programme de reconnaissance de caractères fournit un numéro N de plaque minéralogique estimé à partir de la fraction d'image Fplaque, avec une note de confiance associée PN.In one embodiment of the invention, a character recognition program can then be applied to the F- plate image fraction. This character recognition program provides N number of license estimated from the fraction F image plate, with a confidence score associated P N.

Dans un mode de réalisation, en parallèle du traitement relatif à la plaque minéralogique, le module 11 applique par exemple un traitement numérique sur l'image 11 obtenue par le système de prise de vue 7, permettant d'isoler le visage du conducteur du véhicule 16 (dans un mode de réalisation autre, il peut isoler la représentation du pare-brise du véhicule et de ce qui apparaít au travers de celui-ci, ou isoler la ceinture de sécurité ou le téléphone portable tenu en main par le conducteur).In one embodiment, in parallel with the processing relating to the license plate, the module 11 applies for example a treatment digital image on the image 11 obtained by the shooting system 7, allowing to isolate the driver's face from the vehicle 16 (in one embodiment other, it can isolate the representation of the windshield of the vehicle and of what appear through it, or isolate the seat belt or the telephone portable hand held by the driver).

Il extrait ainsi de l'image considérée une seconde fraction d'image Fvisage représentant le visage du conducteur.He thus extracts from the image considered a second fraction of image F face representing the driver's face.

L'ensemble des données numériques correspondant aux images I1 et 12, et/ou au numéro d'immatriculation estimé N avec la note de confiance associé PN, et/ou aux fractions d'image Fplaque et Fvisage, et à l'infraction de vitesse V sont ensuite sélectionnées et assemblées, puis délivrées par le boítier de commande 9 au bloc de transmission 13. Dans un mode de réalisation de l'invention, l'image 11 pourra être envoyée avec seulement la fraction Fvisage visible (et les autres parties de l'image 11 masquées) afin de préserver des informations d'ordre privé (en particulier, le(s) passager(s) ne peuvent ainsi être identifiés). Dans un autre mode de réalisation, le module de traitement d'images 11 pourra reconstituer une image unique I à partir des images I1 et I2, fournissant la représentation à la fois du visage du conducteur et de la plaque d'immatriculation (ceci afin de réduire le volume des données à transmettre tout en conservant les informations pertinentes).The set of digital data corresponding to the images I1 and 12, and / or the estimated registration number N with the associated confidence score P N , and / or to the image fractions F plate and F face , and to the Speed violation V are then selected and assembled, and then delivered by the control box 9 to the transmission block 13. In one embodiment of the invention, the image 11 may be sent with only the fraction F visible face (and the other parts of the image 11 hidden) to preserve private information (in particular, the passenger (s) can not be identified). In another embodiment, the image processing module 11 will be able to reconstruct a single image I from the images I1 and I2, providing the representation of both the driver's face and the license plate (this in order to reduce the volume of data to be transmitted while retaining relevant information).

Le bloc de transmission 13 compresse, met en forme au moins certaines de ces données (en fonction du mode de réalisation choisi), puis les envoie, via la liaison de communication 14, au centre d'exploitation 15.The transmission block 13 compresses, shapes at least some of these data (depending on the chosen embodiment), then the sends, via the communication link 14, to the exploitation center 15.

Dans ce centre d'exploitation 15, les opérations administratives suivantes sont par exemple effectuées : édition et enregistrement du constat d'infraction comprenant les données envoyées par le bloc de transmission 13, calcul du montant de l'amende correspondant à l'infraction commise par le conducteur du véhicule 16, détermination des coordonnées du conducteur à partir du numéro estimé de la plaque d'immatriculation et envoi du constat d'infraction.In this operations center 15, the administrative operations for example: editing and recording the report infringement comprising the data sent by the transmission block 13, the amount of the fine corresponding to the infringement committed by the driver of the vehicle 16, determination of the driver's from the estimated number of the license plate and sending the statement infringement.

Le nombre de données transmises par voie de transmission est ainsi limité et peut être encore réduit par des techniques de compression. Compte tenu du traitement d'images mis en oeuvre selon l'invention, les données numériques envoyées sur la ou les voies de transmission sont de volume très réduit, pertinentes et de bonne qualité.The number of data transmitted by way of transmission is thus limited and can be further reduced by compression techniques. Account given the image processing implemented according to the invention, the data numbers sent on the transmission channel (s) are very reduced, relevant and of good quality.

Un procédé et un système selon l'invention fournit une représentation de la plaque d'immatriculation d'un véhicule ainsi que du visage du conducteur, ne nécessite qu'un seul éclair de flash. Ils évitent l'obtention d'images inexploitables fréquentes dans l'art antérieur du fait des caractéristiques de réflexion très différentes des divers éléments pouvant apparaítre dans l'image. Ils conviennent particulièrement aux caractéristiques de forte réflexion en infrarouge de la plaque et de faible transmission des nouveaux pare-brises traités pour éviter le passage des rayons infrarouges dans l'habitacle et donc sa surchauffe, ceci à des fins de confort des passagers.A method and system according to the invention provides a representation the number plate of a vehicle and the driver's face, only requires a flash of flash. They avoid obtaining images unusable in the prior art due to the characteristics of very different reflections of the various elements that can appear in the image. They are particularly suitable for the characteristics of strong reflection in infrared plate and low transmission of new windshields treated to prevent the passage of infrared rays in the passenger compartment and therefore overheating, this for the purpose of passenger comfort.

Claims (16)

Procédé d'identification de véhicules (16) en déplacement sur une trajectoire (3) déterminée et comportant un conducteur dans un habitacle et une plaque minéralogique, ledit procédé mettant en oeuvre des moyens d'illumination (17) comprenant au moins une source lumineuse (17a) et un dispositif (17b) de projection du flux lumineux sur le véhicule, et au moins des premiers (7) et des seconds (10) moyens de prise de vue comprenant au moins un premier dispositif optique (7a) et un premier capteur (7b), respectivement au moins un second dispositif optique (10a) et un second capteur (10b), ledit procédé comprenant : dans une phase préparatoire, les étapes suivantes : on définit une position prédéterminée (L) de prise de vue de véhicules ; on règle les premiers moyens de prise de vue de façon à inclure un élément choisi situé dans l'habitacle du véhicule dans une prise de vue de tout véhicule situé dans la susdite position prédéterminée et réalisée à l'aide des premiers moyens de prise de vue ; on règle les seconds moyens de prise de vue de façon à inclure la plaque minéralogique dans une prise de vue de tout véhicule situé dans la susdite position prédéterminée et réalisée à l'aide des seconds moyens de prise de vue ; on constitue les moyens d'illumination de manière à ce qu'ils émettent de la lumière à la fois dans le domaine visible et dans le domaine infrarouge proche ; on constitue les premiers moyens de prise de vue de manière à ce que la bande passante spectrale desdits premiers moyens comprennent la bande spectrale visible ; on constitue les seconds moyens de prise de vue de manière à ce que la bande passante spectrale desdits seconds moyens comprennent la bande spectrale infra-rouge proche ; puis, dans une phase opératoire, les étapes selon lesquelles : on détecte un véhicule situé dans la position prédéterminée ; on déclenche de façon sensiblement simultanée les moyens d'illumination et les premiers et seconds moyens de prise de vue ; on obtient une première image (I1) fournie par les premiers moyens de prise de vue, d'au moins une partie du véhicule incluant une représentation de l'élément choisi et une seconde image (I2), fournie par les seconds moyens de prise de vue, d'au moins une partie du véhicule incluant une représentation de la plaque minéralogique. A method of identifying vehicles (16) traveling on a determined trajectory (3) and comprising a conductor in a passenger compartment and a license plate, said method using illumination means (17) comprising at least one light source ( 17a) and a device (17b) for projecting the luminous flux onto the vehicle, and at least first (7) and second (10) imaging means comprising at least a first optical device (7a) and a first sensor (7b), respectively at least a second optical device (10a) and a second sensor (10b), said method comprising: in a preparatory phase, the following steps: defining a predetermined position (L) for shooting vehicles; the first shooting means are adjusted so as to include a selected element located in the passenger compartment of the vehicle in a shooting of any vehicle situated in the aforesaid predetermined position and carried out using the first means of shooting ; adjusting the second shooting means so as to include the license plate in a shooting of any vehicle located in the aforesaid predetermined position and carried out using the second means of shooting; the illumination means are formed so that they emit light both in the visible range and in the near-infrared range; the first shooting means are constituted so that the spectral bandwidth of said first means comprise the visible spectral band; the second imaging means is constituted so that the spectral bandwidth of said second means comprise the near infra-red spectral band; then, in an operating phase, the steps according to which: detecting a vehicle located in the predetermined position; the illumination means and the first and second means of shooting are triggered substantially simultaneously; a first image (I1) provided by the first image-taking means is obtained, at least part of the vehicle including a representation of the chosen element and a second image (I2), provided by the second image-taking means. view of at least a portion of the vehicle including a representation of the license plate. Procédé selon la revendication 1, selon lequel l'élément choisi est le visage du conducteur.The method of claim 1, wherein the selected element is the driver's face. Procédé selon l'une quelconque des revendications précédentes, selon lequel on constitue les seconds moyens (10) de prise de vue de manière à ce qu'ils atténuent sélectivement l'intensité des signaux reçus appartenant à la bande spectrale visible par rapport à celle des signaux reçus appartenant à la bande spectrale infra-rouge proche.Method according to one of the preceding claims, according to which the second means (10) of shooting is constituted so as to what they selectively attenuate the intensity of the signals received belonging at the visible spectral band compared to that of the signals received belonging to the near infra-red spectral band. Procédé selon la revendication 3, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre situé en amont du second dispositif optique (10a).The method of claim 3, wherein the attenuation is performed at less with a filter located upstream of the second optical device (10a). Procédé selon la revendication 3 ou la revendication 4, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre situé dans le second dispositif optique (10a).A process according to claim 3 or claim 4, wherein the attenuation is achieved at least using a filter located in the second optical device (10a). Procédé selon l'une quelconque des revendications 3 à 5, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre situé entre le second dispositif optique (10a) et le second capteur (10b). Process according to any one of claims 3 to 5, according to which the attenuation is carried out at least using a filter located between the second optical device (10a) and the second sensor (10b). Procédé selon l'une quelconque des revendications 4 à 6, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre transmettant principalement des signaux du domaine de l'infrarouge proche.A process according to any one of claims 4 to 6, wherein the attenuation is carried out at least by means of a transmitting filter mainly signals from the near-infrared domain. Procédé selon l'une quelconque des revendications précédentes, selon lequel on constitue les premiers moyens (7) de prise de vue de manière à ce qu'ils atténuent sélectivement l'intensité des signaux reçus appartenant à la bande spectrale infra-rouge proche par rapport à celle des signaux reçus appartenant à la bande spectrale visible.Method according to one of the preceding claims, according to which constitutes the first means (7) of shooting so as to what they selectively attenuate the intensity of the signals received belonging to the infra-red spectral band close to that of the signals received belonging to the visible spectral band. Procédé selon la revendication 8, selon lequel l'atténuation par les premiers moyens de prise de vue (7) est réalisée au moins à l'aide d'un filtre situé en amont du premier dispositif optique (7a).The method of claim 8, wherein the attenuation by the first means of shooting (7) is carried out at least with the aid of a filter located upstream of the first optical device (7a). Procédé selon la revendication 8 ou la revendication 9, selon lequel l'atténuation par les premiers moyens de prise de vue (7) est réalisée au moins à l'aide d'un filtre situé dans le premier dispositif optique (7a).A process according to claim 8 or claim 9, wherein the attenuation by the first shooting means (7) is carried out at less with a filter in the first optical device (7a). Procédé selon l'une quelconque des revendications 8 à 10, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre situé entre le premier dispositif optique (7a) et le premier capteur (7b).A process according to any of claims 8 to 10, wherein the attenuation is performed at least using a filter located between the first optical device (7a) and the first sensor (7b). Procédé selon l'une quelconque des revendications 8 à 11, selon lequel l'atténuation est réalisée au moins à l'aide d'un filtre transmettant principalement des signaux du domaine du visible.A process according to any of claims 8 to 11, wherein the attenuation is carried out at least by means of a transmitting filter mainly signals from the visible domain. Procédé selon l'une quelconque des revendications précédentes, selon lequel on adapte de façon différente en outre au moins un des paramètres de réglage d'au moins des moyens choisis parmi les premiers (7) et seconds (10) moyens de prise de vue, lesdits paramètres comportant au moins la sensibilité et/ou le temps d'exposition et/ou l'ouverture et/ou le gain.Method according to one of the preceding claims, according to which is furthermore adapted to at least one of the parameters setting of at least one of the first (7) and second (10) means of shooting, said parameters comprising at least less the sensitivity and / or the exposure time and / or the opening and / or the gain. Système d'identification de véhicules en déplacement sur une trajectoire déterminée et comportant un conducteur et une plaque minéralogique, comprenant des moyens pour mettre en oeuvre un procédé selon l'une des revendications précédentes.Identification system for vehicles traveling on a trajectory determined and comprising a driver and a license plate, comprising means for implementing a method according to one of preceding claims. Système d'identification de véhicules selon la revendication 14, comprenant en outre des moyens de transmission (13) fonctionnellement associés à une voie de transmission (14) de données numériques, et propres, en cas d'infraction constatée relative à un véhicule, à transmettre des données numériques représentatives des première (I1) et seconde (I2) prises de vue réalisées pour ledit véhicule.Vehicle identification system according to claim 14, further comprising transmitting means (13) operatively associated with a transmission channel (14) of digital data, and in the event of a detected infringement relating to a vehicle, to be transmitted digital data representative of the first (I1) and second (I2) shots taken for said vehicle. Système d'identification de véhicules selon l'une quelconque des revendications 14 et 15, comprenant des moyens (11) pour extraire des première (I1) et seconde (12) prises de vue réalisées, une image unique comportant à la fois une représentation de la plaque minéralogique et une représentation de l'élément choisi.Vehicle identification system according to any one of claims 14 and 15, comprising means (11) for extracting first (I1) and second (12) shots taken, a single image comprising both a representation of the license plate and a representation of the chosen element.
EP04292606A 2003-12-10 2004-11-03 A moving vehicle identification method and system Expired - Lifetime EP1542191B1 (en)

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FR0314487A FR2867594B1 (en) 2003-12-10 2003-12-10 METHOD AND SYSTEM FOR IDENTIFYING A MOVING VEHICLE

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EP1542191B1 (en) 2006-07-19
FR2867594A1 (en) 2005-09-16
ATE333690T1 (en) 2006-08-15
DE602004001568T2 (en) 2007-06-28
FR2867594B1 (en) 2006-05-26

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