EP1542191B1 - Verfahren und System zur Identifikation eines sich bewegenden Fahrzeuges - Google Patents

Verfahren und System zur Identifikation eines sich bewegenden Fahrzeuges Download PDF

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Publication number
EP1542191B1
EP1542191B1 EP04292606A EP04292606A EP1542191B1 EP 1542191 B1 EP1542191 B1 EP 1542191B1 EP 04292606 A EP04292606 A EP 04292606A EP 04292606 A EP04292606 A EP 04292606A EP 1542191 B1 EP1542191 B1 EP 1542191B1
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EP
European Patent Office
Prior art keywords
vehicle
photographing means
produced
optical device
attenuation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04292606A
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English (en)
French (fr)
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EP1542191A1 (de
Inventor
Guillaume Batto
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Idemia Identity and Security France SAS
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Sagem Defense Securite SA
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Publication of EP1542191A1 publication Critical patent/EP1542191A1/de
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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 identification of a vehicle traveling on a road, or the like.
  • This identification is particularly implemented in the field of controlling traffic conditions, and mainly the speed of motor vehicles.
  • the identification of a vehicle generally includes at least the identification of the registration number of the vehicle. Depending on the type of control carried out, it may also include a number of additional elements relating to the identification of particular features of the vehicle or its occupants, generally relating to offenses committed by the driver or passengers, for example speeding, lack of seat belt, use of a mobile phone by the driver, etc.
  • the detection of infractions can be done using devices such as a radar, a laser or a pair of pneumatic sensors in the case of speed control.
  • a camera is triggered after detection of the offense, to provide an image of the vehicle to read the license plate and generally to see the driver's face (or an element in the passenger compartment representative of a possible offense: a laptop in the driver's ear, a seatbelt not put, etc).
  • the most common use is for an operator, for example a policeman, to take a photograph of the vehicle practically from the front or at a low incidence.
  • the document FR 2 797 081 describes a method and apparatus for identifying a registered motor vehicle for the identification of vehicles.
  • the method described is particularly suitable for the identification of vehicles equipped with retro-reflective plates.
  • two pictures 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 flash of less powerful flash to 'get a good picture of the license plate.
  • the identification of the registration number is thus carried out using a specific photo, another photo allowing the identification of the driver's face.
  • This technique requires two flashes of flash, which means, in addition to flash wear, an obligation to have two successive photographing operations to follow, thus a vehicle processing capacity in a given time lower.
  • the present invention aims at providing a method and a device for identifying a vehicle traveling on a predetermined trajectory that overcomes the limitations of the techniques of the prior art.
  • the method according to the invention proposes a technique of identifying the registration of a vehicle that can be performed automatically, regardless of the offense, and to reduce flash wear and processing time. Indeed, it allows with a single flash of flash to obtain a representation of the license plate and any predetermined element of the cabin located behind the windshield, in the cockpit. An identification according to the invention can be performed without the intervention of an operator to frame the photos.
  • the method according to the invention also makes it possible to carry out the identification of vehicles comprising treated windshields, which in particular prevent the reflection in the direction of the image-taking means of signals in the near-infrared spectral range.
  • the second imaging means are constituted so that they selectively attenuate the intensity of the signals received belonging to the visible spectral band compared to that of the signals received belonging to the spectral band. near infrared, with the added benefit of reducing the shadows on the plate and thus improving its readability.
  • the attenuation is for example performed at least with the aid of a filter located upstream of the second optical device, that is to say between the scene to be photographed and the optical device.
  • Attenuation can be achieved at least by means of a filter located in the second optical device, and / or between the second optical device and the second sensor.
  • the attenuation is carried out at least with the aid of a filter transmitting mainly, or even exclusively, signals of the near-infrared range.
  • the first shooting means are constituted so that they selectively attenuate the intensity of the signals received belonging to the near infrared spectral band with respect to that of the signals received belonging to the visible spectral band.
  • the attenuation provided by the first shooting means is made for example at least with the aid of a filter located upstream of the first optical device, and / or at least with the aid of 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 with the aid of a filter transmitting mainly, or even exclusively, signals of the visible range.
  • At least one of the adjustment parameters of at least one of the first and second means of shooting is adapted differently, said parameters comprising at least the sensitivity and / or the exposure time and / or the opening and / or the gain.
  • the invention proposes a system for identifying vehicles traveling on a given 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 of transmission functionally associated with a digital data transmission channel, and which are clean, in the event of a violation noted. relating to a vehicle, to transmit digital data representative of the first and second shots taken for said vehicle.
  • the vehicle identification system may comprise means for extracting two shots taken for a vehicle, a single image comprising both a representation of the license plate and a representation of the chosen element. This arrangement makes it possible to reduce the volume of data to be transmitted and / or manipulated, and may further enable to remove from the final image non-useful information to highlight the offense and for example infringing the respect of privacy (in particular we can remove the representation of the passenger).
  • the required rate defines the type and capacity of the link to use.
  • FIG. 1 shows a radar 1, comprising a radar antenna 2 installed at the edge of a road 3, and driven by a radar control unit 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 moving vehicles arranged according to the invention.
  • the control unit 4 of the radar 1 transmits on this link signals intended for 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 the near infrared (wavelengths between 0.75 ⁇ m and 1.5 ⁇ m).
  • the flash 17 further comprises an optical light projection device 17b on the scene to be photographed.
  • the device 8 comprises a digital shooting system 7, such as a camera or a video-type 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 adapted to digital image shooting in the visible spectrum.
  • the device 8 further comprises a second digital recording system 10, such as a camera or a video-type camera.
  • 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 system of shooting is adapted to the taking of view of digital images in the near-infrared spectrum.
  • the flash 17 and the cameras 7 and 10 are in this case considered adapted to emit an illumination, respectively to capture images, on receipt of respective quasi simultaneous commands 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 further comprises a memory 12 for storing images.
  • the device 8 also comprises a transmission block 13, which transmits data on a digital data transmission channel 14, intended for a national data exploitation center 15.
  • the communication link 14 may be a dedicated link, by optical fiber, by wired electrical conductor (modem, ADSL or ethernet link), via a radio link, or may be a GPRS or GSM type mainstream radio link, adapted the necessary transmission capacity and reducing transmission and installation costs.
  • a predetermined location L is defined for shooting a vehicle found in violation and traveling on the road 3.
  • the adjustment parameters of the shooting system 7 are fixed so that any shooting of a vehicle detected in the predetermined location L and obtained from the camera system 7 make the face of the driver of the vehicle appear.
  • the adjustment parameters of the camera system 10 are fixed so that any shooting of a vehicle detected in the predetermined location L and obtained from the camera system 10 show the license plate of the vehicle.
  • the images P1 and P2 of a vehicle detected in position L respectively obtained by the camera system 7 and by the camera system 10 are in one embodiment shown in FIGS. 2 and 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 speed calculated with a predefined maximum speed allowed.
  • the control unit 4 sends to the control unit 9 of the device 8, a signal causing the sending from the housing 9 to the flash 17, an illumination control and the sending almost simultaneously from the camera 9, to the camera systems 7 and 10, respectively, of the respective shooting commands, at the moment when the vehicle is in the shooting position L determined previously (this moment is determined by the housing 9 according to the estimated speed for the vehicle).
  • the delay between the first command and the last command is at most 15 ms.
  • a single flash is emitted and the cameras 7 and 10 each capture an image of the vehicle 16.
  • the image I1 captured by the camera system 7 contains the driver's face and the image I2 captured by the shooting system 10 contains the license plate. These images I1 and I2 are stored in the memory 12.
  • a method according to the invention thus makes it possible with a single flash of flash to obtain an identification of the vehicle, comprising the representation of the license plate and that of the driver's face.
  • an identification of the vehicle comprising the representation of the license plate and that of the driver's face.
  • one will choose an element other than the driver's face and located behind the windshield, in the passenger compartment.
  • the shooting system 7 is particularly suitable for taking a picture of a windshield not returning infrared. Similarly, the shooting system 7 is particularly suitable for taking pictures of plates mainly reflecting infrared.
  • the dimensions of the predetermined location area 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 camera system 7, there will not appear a license plate part, or that on an image taken by the shooting system 10, there will not appear a portion of the windshield.
  • a filter 18 may be provided in the image pickup system 10 upstream of the optical device 10a, reducing the signal strength of the visible spectral band.
  • the filter can transmit only the signals of the infrared spectral band.
  • a filter performing similar operations may in another embodiment be disposed in the optical device 10a or between the optical device 10a and the sensor 10b (it is in this case preferably placed on the sensitive area of the sensor 10b).
  • a filter may further be provided in the image pickup 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 only the signals of the visible spectral band.
  • the image processing module 11 is adapted to apply a digital processing to the images I1 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 in parallel with the processing relating to the license plate, applies, for example, digital processing on the image 11 obtained by the camera system 7, making it possible to isolate the driver's face from the vehicle 16 (in another embodiment, it can isolate the representation of the windshield of the vehicle and that which appears through it, or isolate the seat belt or mobile phone held in hand 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 can be sent with only the fraction F visible face (and other parts of the image I1 masked) to preserve private information (in particular, the passenger (s) can not be identified).
  • the module of image processing 11 will be able to reconstruct a unique image I from 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, formats at least some of these data (depending on the embodiment chosen), then sends them, via the communication link 14, to the exploitation center 15.
  • the following administrative operations are performed for example: editing and recording of the statement of offense including the data sent by the transmission block 13, calculation of the amount of the fine corresponding to the offense committed by the driver of the vehicle 16, determining the coordinates of the driver from the estimated number of the license plate and sending the statement of offense.
  • the number of data transmitted by way of transmission is thus limited and can be further reduced by compression techniques.
  • the digital data sent on the transmission channel or channels are very small volume, relevant and of good quality.
  • a method and system according to the invention provides a representation of the license plate of a vehicle as well as the driver's face, requires only a flash of flash. They avoid obtaining unusable images that are frequent in the prior art because of the very different reflection characteristics of the various elements that may appear in the image. They are particularly suitable for the characteristics of high reflection in infrared of the plate and low transmission of the new windshields treated to avoid the passage of the infrared rays in the passenger compartment and therefore its overheating, this for the purpose of comfort of the passengers.

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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)

Claims (16)

  1. Verfahren zur Identifikation von Fahrzeugen (16), die sich auf einer bestimmten Bahn (3) fortbewegen und einen Fahrer in einer Fahrgastzelle und ein Nummernschild umfassen, wobei das Verfahren Beleuchtungsmittel (17) umsetzt, die mindestens eine Lichtquelle (17a) und eine Vorrichtung (17b) zum Projizieren des Lichtstrahls auf das Fahrzeug sowie mindestens erste (7) und zweite (10) Mittel zur Bildaufnahme umfassen, die mindestens eine erste optische Vorrichtung (7a) und einen ersten Sensor (7b) umfassen, jeweils mindestens eine zweite optische Vorrichtung (10a) und einen zweiten Sensor (10b), wobei das Verfahren Folgendes umfasst:
    in einer Vorbereitungsphase die folgenden Schritte:
    - Definieren einer vorausbestimmten Position (L) zur Bildaufnahme von Fahrzeugen,
    - Einstellen der ersten Bildaufnahmemittel, so dass ein ausgewähltes Element, das sich in der Fahrgastzelle des Fahrzeugs befindet, in einer Bildaufnahme des ganzen Fahrzeugs, das sich in der oben genannten vorausbestimmten Position befindet, und die mit Hilfe der ersten Bildaufnahmemittel durchgeführt wird, enthalten ist,
    - Einstellen der zweiten Bildaufnahmemittel, so dass das Nummernschild in einer Bildaufnahme des ganzen Fahrzeugs enthalten ist, das sich in der oben genannten vorausbestimmten Position befindet, und die mit Hilfe der zweiten Bildaufnahmemittel durchgeführt wird,
    - Gestalten der Beleuchtungsmittel so, dass sie Licht gleichzeitig in dem sichtbaren Bereich und in dem nahen Infrarotbereich senden,
    - Gestalten der ersten Bildaufnahmemittel, so dass der spektrale Durchgangsbereich der ersten Mittel das sichtbare spektrale Band enthält,
    - Gestalten der zweiten Bildaufnahmemittel, so dass der spektrale Durchgangsbereich der zweiten Mittel den nahen spektralen Infrarotbereich enthält,
    dann, in einer Betriebsphase, die Schritte gemäß welchen
    - man ein Fahrzeug erfasst, das sich in der vorausbestimmten Position befindet,
    - man im Wesentlichen gleichzeitig die Beleuchtungsmittel und das erste und das zweite Bildaufnahmemittel auslöst,
    - man ein erstes Bild (1), das von den ersten Bildaufnahmemitteln geliefert wird, mindestens eines Teils des Fahrzeugs erzielt, der eine Darstellung des ausgewählten Elements enthält, und ein zweites Bild (2), das von den zweiten Bildaufnahmemitteln geliefert wird, mindestens eines Teils des Fahrzeugs, der eine Darstellung des Nummernschilds enthält.
  2. Verfahren nach Anspruch 1, gemäß welchem das ausgewählte Element das Gesicht des Fahrers ist.
  3. Verfahren nach einem der vorhergehenden Ansprüche, gemäß welchem man die zweiten Bildaufnahmemittel (10) so gestaltet, dass sie selektiv die Stärke der empfangenen Signale, die zu dem sichtbaren spektralen Band gehören, in Bezug auf die der empfangenen Signale, die zu dem nahen spektralen Infrarotbereich gehören, dämpfen.
  4. Verfahren nach Anspruch 3, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters stromaufwärts der zweiten optischen Vorrichtung (10a) durchgeführt wird.
  5. Verfahren nach Anspruch 3 oder Anspruch 4, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters durchgeführt wird, das sich in der zweiten optischen Vorrichtung (10a) befindet.
  6. Verfahren nach einem der Ansprüche 3 bis 5, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters durchgeführt wird, das sich zwischen der zweiten optischen Vorrichtung (10a) und dem zweiten Sensor (10b) befindet.
  7. Verfahren nach einem der.Ansprüche 4 bis 6, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters durchgeführt wird, das im Wesentlichen Signale des nahen Infrarotbereichs überträgt.
  8. Verfahren nach einem der vorhergehenden Ansprüche, gemäß welchem man die ersten Bildaufnahmemittel (7) gestaltet, so dass sie selektiv die Stärke der empfangenen Signale, die zum nahen spektralen Infrarotbereich gehören, in Bezug auf die der empfangenen Signale, die zum sichtbaren spektralen Bereich gehören, dämpfen.
  9. Verfahren nach Anspruch 8, gemäß welchem das Dämpfen durch die ersten Bildaufnahmemittel (7) mindestens mit Hilfe eines Filters stromaufwärts der ersten optischen Vorrichtung (7a) durchgeführt wird.
  10. Verfahren nach Anspruch 8 oder nach Anspruch 9, gemäß welchem das Dämpfen durch die ersten Bildaufnahmemittel (7) mindestens mit Hilfe eines Filters, das sich in der ersten optischen Vorrichtung (7a) befindet, durchgeführt wird.
  11. Verfahren nach einem der Ansprüche 8 bis 10, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters, das sich zwischen der ersten optischen Vorrichtung (7a) und dem ersten Sensor (7b) befindet, durchgeführt wird.
  12. Verfahren nach einem der Ansprüche 8 bis 11, gemäß welchem das Dämpfen mindestens mit Hilfe eines Filters durchgeführt wird, das im Wesentlichen Signale des sichtbaren Bereichs überträgt.
  13. Verfahren nach einem der vorhergehenden Ansprüche, gemäß welchem man ferner mindestens einen der Einstellparameter mindestens eines der Mittel ausgewählt aus dem ersten Bildaufnahmemittel (7) und dem zweiten Bildaufnahmemittel (10) unterschiedlich anpasst, wobei die Parameter mindestens die Empfindlichkeit und/oder die Belichtungsdauer und/oder die Blendeneinstellung und/oder die Verstärkung umfassen.
  14. System zur Identifikation von Fahrzeugen, die sich auf einer vorausbestimmten Bahn fortbewegen und einen Fahrer und ein Nummernschild umfassen, und das Mittel aufweist, um ein Verfahren gemäß einem der vorhergehenden Ansprüche umzusetzen.
  15. System zur Identifikation von Fahrzeugen nach Anspruch 14, das ferner Übertragungsmittel (13) umfasst, die funktional mit einem Übertragungskanal (14) für digitale Daten verbunden sind, und die im Falle eines festgestellten Verstoßes in Zusammenhang mit einem Fahrzeug digitale Daten übertragen können, die für die erste (11) und die zweite (12) Bildaufnahme, die für das Fahrzeug durchgeführt wurden, repräsentativ sind.
  16. System zur Identifikation von Fahrzeugen nach einem der Ansprüche 14 und 15, das Mittel (11) umfasst, um aus der ersten (I1) und zweiten (I2) durchgeführten Bildaufnahme ein einziges Bild zu extrahieren, das sowohl eine Darstellung des Nummernschilds als auch eine Darstellung des ausgewählten Elements umfasst.
EP04292606A 2003-12-10 2004-11-03 Verfahren und System zur Identifikation eines sich bewegenden Fahrzeuges Expired - Lifetime EP1542191B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0314487A FR2867594B1 (fr) 2003-12-10 2003-12-10 Procede et systeme d'identification d'un vehicule en deplacement
FR0314487 2003-12-10

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EP1542191A1 EP1542191A1 (de) 2005-06-15
EP1542191B1 true EP1542191B1 (de) 2006-07-19

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EP (1) EP1542191B1 (de)
AT (1) ATE333690T1 (de)
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US7982634B2 (en) 2006-03-22 2011-07-19 Kria S.R.L. System for detecting vehicles

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AU2009338673B2 (en) * 2009-01-28 2014-03-13 Jenoptik Robot Gmbh Method and system for conclusively capturing a violation of the speed limit on a section of a road
DE102010012811B4 (de) * 2010-03-23 2013-08-08 Jenoptik Robot Gmbh Verfahren zur Messung von Geschwindigkeiten und Zuordnung der gemessenen Geschwindigkeiten zu angemessenen Fahrzeugen durch Erfassen und Zusammenführen von Objekt-Trackingdaten und Bild-Trackingdaten
US9641806B2 (en) 2013-03-12 2017-05-02 3M Innovative Properties Company Average speed detection with flash illumination
FR3048104B1 (fr) * 2016-02-19 2018-02-16 Hymatom Procede et dispositif de capture d'images d'un vehicule
FR3063827B1 (fr) * 2017-03-07 2021-09-17 Bluematrix Procede et dispositif de surveillance routiere et sa fabrication

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EP1542191A1 (de) 2005-06-15
FR2867594B1 (fr) 2006-05-26
FR2867594A1 (fr) 2005-09-16
ATE333690T1 (de) 2006-08-15
DE602004001568T2 (de) 2007-06-28
DE602004001568D1 (de) 2006-08-31

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