EP2220634B1 - Method and device for detecting whether a vehicle has exceeded a speed limit - Google Patents

Method and device for detecting whether a vehicle has exceeded a speed limit Download PDF

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Publication number
EP2220634B1
EP2220634B1 EP08858840A EP08858840A EP2220634B1 EP 2220634 B1 EP2220634 B1 EP 2220634B1 EP 08858840 A EP08858840 A EP 08858840A EP 08858840 A EP08858840 A EP 08858840A EP 2220634 B1 EP2220634 B1 EP 2220634B1
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EP
European Patent Office
Prior art keywords
vehicle
feature
monitoring
vehicle feature
captured
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Not-in-force
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EP08858840A
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German (de)
French (fr)
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EP2220634A1 (en
Inventor
Josef Alois Birchbauer
Jürgen HATZL
Marcus Hennecke
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Siemens AG
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Siemens AG
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Priority to PL08858840T priority Critical patent/PL2220634T3/en
Publication of EP2220634A1 publication Critical patent/EP2220634A1/en
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Publication of EP2220634B1 publication Critical patent/EP2220634B1/en
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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 invention relates to a method and a device for detecting a speeding violation of a vehicle, wherein a speed violation of the vehicle is detected on the basis of an average speed of the vehicle within a monitoring path.
  • a period of time is determined which a vehicle requires to cover the monitoring route, whereby such a monitoring route is generally a longer, for example several kilometers long, section of a route Highway or around a tunnel section.
  • the average speed of the vehicle is calculated, from which then optionally results in exceeding the predetermined maximum speed.
  • a speeding violation of a vehicle is determined, for example, as part of traffic monitoring in order to monitor adherence to a predetermined maximum speed in road traffic.
  • a method of the type mentioned is, for example, from WO 01/35372 A1 known.
  • WO 01/35372 A1 For monitoring the average speed along the monitoring path, two spaced-apart monitoring stations are provided. By means of a camera, a retraction and departure from the monitoring route by a vehicle is registered at the monitoring stations. In this case, an image of the vehicle is obtained when entering the vehicle in the monitoring route, and when leaving the monitoring route by means of the camera and the image is a vehicle license plate of the vehicle. The determined data are stored at least temporarily.
  • the present invention seeks to provide an alternative method for detecting a speeding of a vehicle. Another object is to provide an alternative device for detecting a speeding of a vehicle.
  • a vehicle characteristic characterizing a vehicle entering a monitoring route is detected at a first time, wherein a first coding value that can be assigned to the vehicle feature is determined by means of a one-way encryption method.
  • a second coding value that can be assigned to the vehicle feature detected at the second time is determined by means of the one-way encryption method.
  • the assignment of the coding values can be particularly unambiguous.
  • the first and second coding values are compared with each other. If the first and the second coding value match, an average speed of the vehicle is determined on the basis of the time span required to travel the monitoring distance. The average speed is compared with a predetermined maximum speed, and only if the maximum speed is detected by the average speed is the vehicle characteristic stored.
  • the invention is based on the consideration that for the detection of a speed violation on the basis of an average speed according to the prior art usually of each vehicle, which travels a monitoring distance, when entering and leaving the monitoring distance a characteristic vehicle feature, such as the license plate, detected and stored at least temporarily.
  • a speed violation can only be determined when leaving the monitoring route, so that the characteristic vehicle feature, such as the license plate, was also collected and temporarily stored, if there is no speeding, the driver has therefore behaved in accordance with the law.
  • This can in particular data protection concerns arise, especially since such a characteristic vehicle feature allows individualization of the vehicle in question, which in particular also opens the possibility of a conclusion on personal data of a vehicle owner.
  • the invention therefore provides for storing a characteristic vehicle feature only when a speed violation actually occurs.
  • the invention first assigns a first coding value to the vehicle feature detected at the time of entry at a first time, so that the vehicle characteristic underlying the coding value can no longer be deduced from the first coding value.
  • the first coding value is determined by means of a one-way encryption method. While it is usually possible with a "normal” encryption method to obtain the corresponding unencrypted value from the encrypted value when the "key" is known, there is simply no "key” in the one-way encryption method. This makes it almost impossible to deduce from the first coding value back to the vehicle characteristic underlying the first coding value. If, for example, the vehicle registration number has been recorded as a vehicle feature, it is almost impossible to reconclude the vehicle registration number from the corresponding first coding value. This feature of the one-way encryption technique is sometimes referred to as "pre-image resistance.”
  • the first encoding value is associated with the vehicle feature, i. Each vehicle which enters the monitoring route receives a "unique" first coding value.
  • the first coding value is stored at least temporarily.
  • the vehicle characteristic itself underlying the first coding value is not stored. An identification of the incoming vehicle is therefore not possible in the following by the characteristic vehicle feature, but only by the first Kodierwert.
  • the vehicle feature of a vehicle leaving the monitoring route is detected, wherein the detected vehicle feature is assigned a second coding value by means of the one-way encryption method. Since both the first and the second coding value are assigned to the vehicle feature, it is possible to identify a vehicle driving the monitoring route by comparing the corresponding coding values. A match of the first and the second coding value means that, for example, the vehicle A, which has moved into the monitoring path at the first time, leaves the monitoring path again at the second time. Since the length of the monitoring path is known, the average speed then results from the time period between the first and the second time.
  • the determined average speed is compared with a predetermined maximum speed, for example a "speed limit". Only when, in the comparison, an exceeding of the maximum speed by the average speed is detected, the vehicle characteristic detected by the vehicle leaving the monitoring route is stored. This means that it comes only in case of speeding to a storage of data that allow individualization of the vehicle and thus, for example, in terms of a fines levy, allow conclusions about the vehicle owner.
  • a predetermined maximum speed for example a "speed limit”.
  • the invention provides in an advantageous embodiment that an identifying image taken of the incoming vehicle, another vehicle feature detected, under identification of the other Vehicle feature generated a dynamic key, the image capture using the generated dynamic key encrypted, discarded the key, when leaving the monitoring track detects the other vehicle feature, generated at a detected exceed the maximum speed of the key by means of the further recorded upon leaving the vehicle feature, the encrypted image capture means tries to decrypt the newly generated key, and only on successful decryption the image recording the vehicle feature is stored.
  • the image recording can in particular include the characteristic vehicle feature.
  • the characteristic and the other vehicle feature can be identical.
  • an image recording of the vehicle registration number of the entering vehicle is encrypted.
  • the key to this encryption is not "fixed” but dynamic, i. the key is regenerated for each incoming vehicle.
  • the dynamic key is thereby generated in particular on the basis of the further vehicle feature, which in principle can be any desired vehicle feature, such as a vehicle color or a vehicle shape.
  • the motor vehicle license plate is also used for the generation of the key, since this characterizes each vehicle clearly, so that in particular the generated key is unique for each vehicle.
  • the key After encrypting the image recording, the key is deleted again, so that it can no longer be accessed by unauthorized persons. Only under identification of the further vehicle feature, the key can be regenerated again and the encrypted image capture decrypted again. Otherwise, the decryption fails.
  • the image acquisition can additionally be stored in a further embodiment of the invention.
  • the first and the second coding value from the detected vehicle feature is determined by means of a hash algorithm.
  • a hash algorithm is generally used to calculate a scatter value function, which is also referred to as a hash function.
  • a cryptographic hash function is addressed, which is often used, for example, for storing passwords.
  • the corresponding coding value is calculated as a so-called hash value.
  • the memory requirement of such a hash value is generally very low, so that the hash algorithm in particular also enables the fast and effective processing of large amounts of data.
  • the vehicle feature may be, for example, a single optical vehicle feature, such as a license plate, a vehicle shape, or a color design. It is also possible to detect a combination of different vehicle characteristics or a characteristic acoustic signal of the vehicle.
  • a license plate of the vehicle is detected as a vehicle feature.
  • the license plate makes it possible to characterize the vehicle in a particularly simple way.
  • the license plate is thereby detected, for example, by means of a camera, so that already existing surveillance cameras, e.g. can be used for other traffic monitoring in road traffic.
  • the license plate of the license plate is detected by means of an automatic license plate recognition.
  • the license plate usually includes a variety of features, such as a characteristic shape or color, a .Landkennung and the license plate number.
  • the license plate is usually sufficient to clearly characterize the vehicle. This makes it possible, in particular, to effectively reduce the amount of data to be processed.
  • the license plate number from an image of the vehicle is automatically determined, for example, by means of optical character recognition (OCR), in particular by means of the LPR (License Plate Recognition) or the ANPR (Automatic Number Plate Recognition).
  • OCR optical character recognition
  • LPR Local Plate Recognition
  • ANPR Automatic Number Plate Recognition
  • the use of the one-way encryption method in generating the first and second encoding values makes it almost impossible to "crack" the corresponding coding values, thereby inferring the underlying vehicle characteristic of each of the coding values.
  • a “brute-force” attack is understood to mean a “cracking" of the coding value by trying out all possible solutions. Concretely, this would mean that, for example, for a "brute-force” attack, the corresponding coding value would be calculated for each license plate present in an official license plate register in order to find the license plate number on which a specific coding value is based.
  • an official license plate register is usually safe from unauthorized access.
  • an additional vehicle feature is detected.
  • a combination of vehicle features is detected, for example, the vehicle registration number and an additional vehicle feature.
  • the first and second coding values are in each case assigned to the detected combination of vehicle features. Since a combination of vehicle features is usually not recorded in any database, it can be ensured by detecting the additional vehicle feature that even by a "brute-force" attack can not be closed by the corresponding coding value, for example on the vehicle registration.
  • the detection of any combination of acoustic and / or optical vehicle features is possible in this embodiment of the invention.
  • the vehicle registration number and an additional vehicle feature is detected.
  • an optical feature of the vehicle is detected as an additional vehicle feature, in particular the color of the vehicle.
  • the object directed to a device is achieved according to the invention by the features of the claim directed to a device.
  • the device for detecting a speed violation of a vehicle comprises a first monitoring station and a second monitoring station spaced apart from the first monitoring station, as well as a coding device, a timing device and a computing device.
  • the computing device is connected to the first and second monitoring stations, as well as to the coding device and the timing device.
  • the first and second monitoring stations in each case comprise a detection means which is adapted to detect a characteristic vehicle feature of a vehicle entering a monitoring route and leaving a monitoring route.
  • the time-measuring device is configured to detect a first time of entry into the monitoring path and a second time of exit of the monitoring path.
  • the encoding device is configured to determine first and second encoding values from the vehicle features detected by the first and second monitoring stations, respectively, by a one-way encryption method, and the computing device is configured to set an average speed of the vehicle within the distance between the first and second encoder values determine second monitoring station based on the timing signals of the time measuring device, and to detect an exceeding of a predetermined maximum speed and to store the vehicle feature at a detected overrun.
  • the first monitoring station and the second monitoring station are spaced apart from one another so that they essentially predetermine the length of the monitoring path with their distance from one another.
  • the distance of the monitoring stations from each other for example, be several hundred meters or a few kilometers.
  • the first and the second monitoring stations are each equipped with a detection means.
  • the detection means detects a characteristic vehicle characteristic of a vehicle entering the monitoring route and leaving the monitoring route.
  • the detection means can be designed to detect optical and / or acoustic vehicle features.
  • the detection means comprises for example, a microphone.
  • the detection means expediently comprises a camera, for example a video camera or a telephoto camera. Such a camera may be positioned such that it takes a picture of the rear of the vehicle or an image of another area of the vehicle.
  • the optical vehicle feature is detected, for example, by the image acquisition as such.
  • the optical vehicle feature is extracted from the image acquisition, for example, by a corresponding recognition software and detected.
  • the detection means comprises, for example, a corresponding circuit or is connected via an interface to the computing device.
  • the monitoring stations may additionally include light sources that illuminate the vehicle.
  • lighting by an infrared light source is advantageous in order to enable nocturnal image recordings.
  • the coding device determines a first or a second coding value by means of a one-way encryption method.
  • the coding device can be implemented as a corresponding circuit or as software in the computing device, which is given for example as a computer. Alternatively, the coding device may be given as a separate computer.
  • the first time is detected, in which a vehicle enters the monitoring route, that is, the first monitoring station passes.
  • the vehicle-type identification device uses the coding values to determine the time required for the detected vehicle to travel the distance between the first and the second monitoring stations. For this purpose, the computing device synchronizes, for example, the time signals received by the time-measuring device.
  • the computing device From the determined period of time calculates the computing device, including the length of the monitoring path, an average speed of the vehicle within the monitoring distance.
  • the computing device compares the determined average speed with a predetermined maximum speed. If the predefined maximum speed is exceeded, the computing device stores the vehicle feature, that is to say, for example, the motor vehicle license plate which characterizes the vehicle leaving the monitoring route.
  • FIG. 1 shows two devices 2, 2 'for detecting a speed violation, which are provided for traffic monitoring on a 2-lane highway 4. As can be seen from the illustration, in each case one of the devices 2, 2 'is provided for monitoring one of the two directional lanes 6, 8.
  • Each of the devices 2, 2 comprises two monitoring stations 10, 12, which are spaced from each other, such that the Monitoring station 10 seen in the direction of travel 14 before the monitoring station 12 is located. As a result, a monitoring path 13 is predetermined by the monitoring stations 10, 12. The distance between the monitoring stations 10, 12 can be several kilometers.
  • the monitoring stations 10, 12 are each assigned a detection means 16.
  • a timing device 18, a coding device 20, as well as a computing device 22 are provided in each case.
  • a vehicle characteristic characterizing the vehicle 24, 26 is detected.
  • a combination of optical vehicle features namely a license plate 30 of a license plate 23 and additionally a color of the corresponding vehicle 24, 26 is detected.
  • the detection means 16 comprises a camera 28.
  • the camera 28 acquires an image of the rear area, which in particular also images the license plate 23 of the respective vehicle 24, 26. From the image recording of the rear area then the vehicle feature, so the vehicle registration number 30 and the color of the vehicle 24, 26, determined.
  • the vehicle registration number 30 is in this case detected in particular by means of an automatic license plate recognition from the image acquisition.
  • the feature combination of motor vehicle license plate 30 and color of the vehicle 24, 26 detected by the detection means 16 is assigned a first or second coding value by means of the coding device 20.
  • the coding device 20 is realized for this purpose as a corresponding software of the computing device 22.
  • the first coding value is assigned to the detected feature combination of a vehicle 24 entering the monitoring route 13.
  • the second coding value is assigned to the detected feature combination of a vehicle 26 leaving the monitoring route 13.
  • the first and second coding values are each uniquely assigned to the detected feature combination.
  • the first and second coding values are respectively determined by means of a one-way encryption method. As a result, it is almost impossible to return from the first or the second coding value back to the vehicle characteristic underlying the coding values mentioned. That a "cracking" of the coding values is almost impossible. A “cracking" would theoretically be possible at best by a "brute-force” attack. By detecting the feature combination of vehicle registration number 30 and vehicle color, the "cracking" of the coding values is effectively prevented by a "brute-force” attack, since such a combination of features is not recorded in any database.
  • the retracting into the monitoring section 13 vehicle 24 happens when entering first the front in the direction of travel 14 monitoring station 10.
  • the front monitoring station 10 detected by means of its associated detection means 16, the vehicle registration number 30 and the color of the incoming vehicle 24th
  • the said feature combination of motor vehicle license plate 30 and color of the incoming vehicle 24 is assigned by means of the coding device 20, a first Kodierwert which is uniquely associated with the retracting vehicle 24.
  • the time measuring device 18 detects when entering the vehicle 24 in the monitoring section 13, a first time.
  • the timing device 18 is given, for example, as a corresponding electronic circuit of the computing device 20.
  • the vehicle 26 When leaving the monitoring section 13, the vehicle 26 passes the rear in the direction of travel 14 monitoring station 12, wherein the timing device 18 detects a second time.
  • the coding device 20 assigns the feature combination of motor vehicle license plate 30 and color of the leaving vehicle 26 to a second coding value.
  • the second encoding value is uniquely associated with said feature combination of the leaving vehicle 26, i.
  • Each vehicle leaving the monitoring route 13 receives a "unique" second coding value. This makes it possible to determine by means of a comparison of the first and second Kodierwerts whether the monitoring section 13 leaving the second time vehicle 26 is the same as the first time in the monitoring track 13 retracted vehicle 24. Voices of the first and the second Kodierwert match , so it is the same vehicle.
  • the computing device 22 uses the time signals of the time measurement device 18 to determine the time required for the vehicle 24, 26 to travel the monitoring route 13. Including the length of the monitoring section 13, the computing device 22 determines the average speed of the vehicle 24, 26 within the monitoring section 13 and compares the determined average speed with a predetermined maximum speed. If the average speed exceeds the predefined maximum speed, the computing device 22 stores the motor vehicle license plate 13 of the vehicle 24, 26. In addition, the computing device 22 also stores an image capture here, which represents the rear area of the corresponding vehicle 24, 26.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Transmission Device (AREA)

Abstract

A method for detecting if a vehicle has exceeded a speed limit captures a vehicle feature characterizing a vehicle entering a monitoring section at a first time. A first coding value to be assigned to the vehicle feature is determined by one-way encryption. The vehicle feature of a vehicle leaving the monitoring section is captured at a second time. A second coding value to be assigned to the vehicle feature captured at the second point in time is determined by the one-way encryption. The first and second coding values are compared and if they match, the average speed of the vehicle is determined using the time required to travel through the monitoring section. The average speed is compared to a predefined maximum speed and the vehicle feature is only stored if the average speed exceeds the maximum speed. A corresponding device for carrying out the method is also provided.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erfassung einer Geschwindigkeitsübertretung eines Fahrzeugs, wobei eine Geschwindigkeitsübertretung des Fahrzeugs anhand einer Durchschnittsgeschwindigkeit des Fahrzeugs innerhalb einer Überwachungsstrecke erfasst wird.The invention relates to a method and a device for detecting a speeding violation of a vehicle, wherein a speed violation of the vehicle is detected on the basis of an average speed of the vehicle within a monitoring path.

Zur Erfassung der Durchschnittsgeschwindigkeit wird bei einem solchen, auch "Section-Control" genannten Verfahren eine Zeitspanne ermittelt, die ein Fahrzeug zum Zurücklegen der Überwachungsstrecke benötigt, wobei es sich bei einer derartigen Überwachungsstrecke in der Regel um einen längeren, beispielsweise mehrere Kilometer langen Streckenabschnitt einer Autobahn oder um einen Tunnelabschnitt handelt. Mittels der ermittelten Zeitspanne wird die Durchschnittsgeschwindigkeit des Fahrzeugs berechnet, woraus sich dann gegebenenfalls eine Überschreitung der vorgegebenen Maximalgeschwindigkeit ergibt.In order to record the average speed, in such a method also referred to as "section control", a period of time is determined which a vehicle requires to cover the monitoring route, whereby such a monitoring route is generally a longer, for example several kilometers long, section of a route Highway or around a tunnel section. By means of the determined period of time, the average speed of the vehicle is calculated, from which then optionally results in exceeding the predetermined maximum speed.

Eine Geschwindigkeitsübertretung eines Fahrzeugs wird beispielsweise im Rahmen einer Verkehrsüberwachung ermittelt, um die Einhaltung einer vorgegebenen Maximalgeschwindigkeit im Straßenverkehr zu überwachen.A speeding violation of a vehicle is determined, for example, as part of traffic monitoring in order to monitor adherence to a predetermined maximum speed in road traffic.

Ein Verfahren der eingangs genannten Art ist beispielsweise aus der WO 01/35372 A1 bekannt. In der WO 01/35372 A1 sind zur Erfassung der Durchschnittsgeschwindigkeit entlang der Überwachungsstrecke zwei voneinander beabstandete Überwachungsstationen vorgesehen. Mittels einer Kamera wird an den Überwachungsstationen ein Einfahren und ein Verlassen der Überwachungsstrecke durch ein Fahrzeug registriert. Dabei wird beim Einfahren des Fahrzeugs in die Überwachungsstrecke, sowie beim Verlassen der Überwachungsstrecke mittels der Kamera ein Bild des Fahrzeugs gewonnen und aus dem Bild ein Kraftfahrzeugkennzeichen des Fahrzeugs ermittelt. Die ermittelten Daten werden zumindest temporär gespeichert.A method of the type mentioned is, for example, from WO 01/35372 A1 known. In the WO 01/35372 A1 For monitoring the average speed along the monitoring path, two spaced-apart monitoring stations are provided. By means of a camera, a retraction and departure from the monitoring route by a vehicle is registered at the monitoring stations. In this case, an image of the vehicle is obtained when entering the vehicle in the monitoring route, and when leaving the monitoring route by means of the camera and the image is a vehicle license plate of the vehicle. The determined data are stored at least temporarily.

Ausgehend vom Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein alternatives Verfahren zur Erfassung einer Geschwindigkeitsübertretung eines Fahrzeugs anzugeben. Eine weitere Aufgabe besteht darin, eine alternative Vorrichtung zur Erfassung einer Geschwindigkeitsübertretung eines Fahrzeugs anzugeben.Based on the prior art, the present invention seeks to provide an alternative method for detecting a speeding of a vehicle. Another object is to provide an alternative device for detecting a speeding of a vehicle.

Die auf ein Verfahren gerichtete Aufgabe wird erfindungsgemäß durch die Merkmalskombination des Anspruchs 1 gelöst.The task directed to a method according to the invention is achieved by the feature combination of claim 1.

Demgemäß wird zu einem ersten Zeitpunkt ein ein in eine Überwachungsstrecke einfahrendes Fahrzeug charakterisierendes Fahrzeugmerkmal erfasst, wobei mittels eines Einweg-Verschlüsselungsverfahrens ein dem Fahrzeugmerkmal zuordenbarer erster Kodierwert ermittelt wird. Zu einem zweiten Zeitpunkt wird das Fahrzeugmerkmal eines die Überwachungsstrecke verlassenden Fahrzeugs erfasst, wobei mittels des Einweg-Verschlüsselungsverfahrens ein dem zum zweiten Zeitpunkt erfassten Fahrzeugmerkmal zuordenbarer zweiter Kodierwert ermittelt wird. Die Zuordnung der Kodierwerte kann insbesondere eindeutig sein. Der erste und der zweite Kodierwert werden miteinander verglichen. Bei einer Übereinstimmung des ersten und des zweiten Kodierwerts wird eine Durchschnittsgeschwindigkeit des Fahrzeugs anhand der zum Zurücklegen der Überwachungsstrecke benötigten Zeitspanne ermittelt. Die Durchschnittsgeschwindigkeit wird mit einer vorgegebenen Maximalgeschwindigkeit verglichen und nur bei einer festgestellten Überschreitung der Maximalgeschwindigkeit durch die Durchschnittsgeschwindigkeit wird das Fahrzeugmerkmal gespeichert.Accordingly, a vehicle characteristic characterizing a vehicle entering a monitoring route is detected at a first time, wherein a first coding value that can be assigned to the vehicle feature is determined by means of a one-way encryption method. At a second point in time, the vehicle characteristic of a vehicle leaving the monitoring route is detected, wherein a second coding value that can be assigned to the vehicle feature detected at the second time is determined by means of the one-way encryption method. The assignment of the coding values can be particularly unambiguous. The first and second coding values are compared with each other. If the first and the second coding value match, an average speed of the vehicle is determined on the basis of the time span required to travel the monitoring distance. The average speed is compared with a predetermined maximum speed, and only if the maximum speed is detected by the average speed is the vehicle characteristic stored.

Die Erfindung geht von der Überlegung aus, dass für die Erfassung einer Geschwindigkeitsübertretung anhand einer Durchschnittsgeschwindigkeit gemäß dem Stand der Technik in der Regel von jedem Fahrzeug, welches eine Überwachungsstrecke befährt, beim Einfahren und beim Verlassen der Überwachungsstrecke ein charakteristisches Fahrzeugmerkmal, wie beispielsweise das Kraftfahrzeugkennzeichen, erfasst und zumindest temporär gespeichert wird. Eine Geschwindigkeitsübertretung kann erst beim Verlassen der Überwachungsstrecke ermittelt werden, so dass das charakteristische Fahrzeugmerkmal, beispielsweise das Kraftfahrzeugkennzeichen, auch dann erhoben und temporär gespeichert wurde, wenn sich keine Geschwindigkeitsüberschreitung ergibt, der Fahrer sich also gesetzeskonform verhalten hat. Daraus können insbesondere datenschutzrechtliche Bedenken erwachsen, zumal ein derartiges charakteristisches Fahrzeugmerkmal eine Individualisierung des betreffenden Fahrzeugs erlaubt, was insbesondere auch die Möglichkeit eines Rückschlusses auf personenbezogene Daten eines Fahrzeughalters eröffnet.The invention is based on the consideration that for the detection of a speed violation on the basis of an average speed according to the prior art usually of each vehicle, which travels a monitoring distance, when entering and leaving the monitoring distance a characteristic vehicle feature, such as the license plate, detected and stored at least temporarily. A speed violation can only be determined when leaving the monitoring route, so that the characteristic vehicle feature, such as the license plate, was also collected and temporarily stored, if there is no speeding, the driver has therefore behaved in accordance with the law. This can in particular data protection concerns arise, especially since such a characteristic vehicle feature allows individualization of the vehicle in question, which in particular also opens the possibility of a conclusion on personal data of a vehicle owner.

Die Erfindung sieht deswegen vor, ein charakteristisches Fahrzeugmerkmal erst dann zu speichern, wenn eine Geschwindigkeitsübertretung tatsächlich vorliegt.The invention therefore provides for storing a characteristic vehicle feature only when a speed violation actually occurs.

Die Erfindung ordnet dazu dem bei Einfahrt zu einem ersten Zeitpunkt erfassten Fahrzeugmerkmal zunächst einen ersten Kodierwert zu, derart dass aus dem ersten Kodierwert nicht mehr auf das dem Kodierwert zugrunde liegende Fahrzeugmerkmal geschlossen werden kann. Dazu wird der erste Kodierwert mittels eines Einweg-Verschlüsselungsverfahrens ermittelt. Während es bei einem "normalen" Verschlüsselungsverfahren in der Regel möglich ist, bei Kenntnis des "Schlüssels" aus dem verschlüsselten Wert den entsprechenden unverschlüsselten Wert zu erhalten, existiert vereinfacht gesagt bei dem Einweg-Verschlüsselungsverfahren kein "Schlüssel". Dadurch ist es nahezu unmöglich, von dem ersten Kodierwert wieder zurück auf das dem ersten Kodierwert zugrunde liegende Fahrzeugmerkmal zu schließen. Wenn beispielsweise als Fahrzeugmerkmal das Kraftfahrzeugkennzeichen erfasst wurde, ist es nahezu unmöglich, aus dem entsprechenden ersten Kodierwert wieder auf das Kraftfahrzeugkennzeichen zu schließen. Diese Eigenschaft des Einweg-Verschlüsselungsverfahrens wird gelegentlich auch als "pre-image resistance" bezeichnet.For this purpose, the invention first assigns a first coding value to the vehicle feature detected at the time of entry at a first time, so that the vehicle characteristic underlying the coding value can no longer be deduced from the first coding value. For this purpose, the first coding value is determined by means of a one-way encryption method. While it is usually possible with a "normal" encryption method to obtain the corresponding unencrypted value from the encrypted value when the "key" is known, there is simply no "key" in the one-way encryption method. This makes it almost impossible to deduce from the first coding value back to the vehicle characteristic underlying the first coding value. If, for example, the vehicle registration number has been recorded as a vehicle feature, it is almost impossible to reconclude the vehicle registration number from the corresponding first coding value. This feature of the one-way encryption technique is sometimes referred to as "pre-image resistance."

Der erste Kodierwert ist dem Fahrzeugmerkmal zugeordnet, d.h. jedes Fahrzeug, welches in die Überwachungsstrecke einfährt, erhält einen "eigenen" ersten Kodierwert. Der erste Kodierwert wird zumindest temporär gespeichert. Das dem ersten Kodierwert zugrunde liegende Fahrzeugmerkmal selber wird nicht gespeichert. Eine Identifizierung des einfahrenden Fahrzeugs ist also im Folgenden nicht durch das charakteristische Fahrzeugmerkmal möglich, sondern nur durch den ersten Kodierwert.The first encoding value is associated with the vehicle feature, i. Each vehicle which enters the monitoring route receives a "unique" first coding value. The first coding value is stored at least temporarily. The vehicle characteristic itself underlying the first coding value is not stored. An identification of the incoming vehicle is therefore not possible in the following by the characteristic vehicle feature, but only by the first Kodierwert.

Zu einem zweiten Zeitpunkt wird das Fahrzeugmerkmal eines die Überwachungsstrecke verlassenden Fahrzeugs erfasst, wobei dem erfassten Fahrzeugmerkmal mittels des Einweg-Verschlüsselungsverfahrens ein zweiter Kodierwert zugeordnet wird. Da sowohl der erste als auch der zweite Kodierwert dem Fahrzeugmerkmal zugeordnet ist, ist es möglich, durch einen Vergleich der entsprechenden Kodierwerte ein die Überwachungsstrecke befahrendes Fahrzeug zu identifizieren. Eine Übereinstimmung des ersten und des zweiten Kodierwerts bedeutet, dass beispielsweise das Fahrzeug A, welches zum ersten Zeitpunkt in die Überwachungsstrecke eingefahren ist, zum zweiten Zeitpunkt die Überwachungsstrecke wieder verlässt. Da die Länge der Überwachungsstrecke bekannt ist, ergibt sich die Durchschnittsgeschwindigkeit dann anhand der Zeitspanne zwischen dem ersten und dem zweiten Zeitpunkt.At a second time, the vehicle feature of a vehicle leaving the monitoring route is detected, wherein the detected vehicle feature is assigned a second coding value by means of the one-way encryption method. Since both the first and the second coding value are assigned to the vehicle feature, it is possible to identify a vehicle driving the monitoring route by comparing the corresponding coding values. A match of the first and the second coding value means that, for example, the vehicle A, which has moved into the monitoring path at the first time, leaves the monitoring path again at the second time. Since the length of the monitoring path is known, the average speed then results from the time period between the first and the second time.

Die ermittelte Durchschnittsgeschwindigkeit wird mit einer vorgegebenen Maximalgeschwindigkeit, beispielsweise einem "Tempolimit", verglichen. Nur wenn bei dem Vergleich eine Überschreitung der Maximalgeschwindigkeit durch die Durchschnittsgeschwindigkeit festgestellt wird, wird das Fahrzeugmerkmal, welches von dem die Überwachungsstrecke verlassenden Fahrzeug erfasst wurde, gespeichert. Das bedeutet also, dass es nur im Falle einer Geschwindigkeitsüberschreitung zu einer Speicherung von Daten kommt, die eine Individualisierung des Fahrzeugs erlauben und damit, beispielsweise im Sinne einer Bußgelderhebung, Rückschlüsse auf den Fahrzeughalter zulassen.The determined average speed is compared with a predetermined maximum speed, for example a "speed limit". Only when, in the comparison, an exceeding of the maximum speed by the average speed is detected, the vehicle characteristic detected by the vehicle leaving the monitoring route is stored. This means that it comes only in case of speeding to a storage of data that allow individualization of the vehicle and thus, for example, in terms of a fines levy, allow conclusions about the vehicle owner.

Falls keine Überschreitung der Maximalgeschwindigkeit festgestellt wird, erfolgt keine Speicherung des erfassten Fahrzeugmerkmals. In dem Fall werden also bei dem Verfahren zu keinem Zeitpunkt, also weder beim Einfahren in die Überwachungsstrecke, noch beim Verlassen dieser, Daten gespeichert, die als solche eine Individualisierung des Fahrzeugs erlauben.If no exceeding of the maximum speed is detected, there is no storage of the detected vehicle characteristic. In this case, in the method at no time, that is to say neither when entering the monitoring path nor when leaving the latter, are data stored which as such permit individualization of the vehicle.

Bei einer jeweils eindeutigen Zuordnung der Kodierwerte zu dem das Fahrzeug charakterisierenden Fahrzeugmerkmal ist jedwede Verwechslung bei der Identifizierung eines geschwindigkeitsübertretenden Fahrzeugs ausgeschlossen. Jedoch ist es selbst bei äußerst komplexen Kodierverfahren nicht gänzlich ausgeschlossen, dass es zu einer sogenannten "Kollision" von Kodierwerten kommt. Eine derartige "Kollision" tritt dann auf, wenn zwei unterschiedlichen Fahrzeugmerkmalen der gleiche Kodierwert zugeordnet wird. Dadurch könnte es bei einem Vergleich des ersten und des zweiten Kodierwerts zu einer Verwechslung von Fahrzeugen kommen, wodurch es unter Umständen zu einer unberechtigten Feststellung einer Geschwindigkeitsübertretung eines Fahrzeugs kommen könnte.With a respectively unique assignment of the coding values to the vehicle characteristic characterizing the vehicle, any confusion in the identification of a speeding vehicle is excluded. However, even with extremely complex coding methods, it is not completely ruled out that a so-called "collision" of coding values occurs. Such a "collision" occurs when two different vehicle features are assigned the same coding value. This could lead to a confusion of vehicles in a comparison of the first and the second encoding value, which could possibly lead to an unjustified determination of a speeding violation of a vehicle.

Um zu vermeiden, dass es durch eine derartige "Kollision" von Kodierwerten zu einer unberechtigten Belangung eines unbescholtenen Fahrzeughalters kommt, sieht die Erfindung in einer vorteilhaften Ausgestaltung vor, dass eine identifizierende Bildaufnahme des einfahrenden Fahrzeugs getätigt, ein weiteres Fahrzeugmerkmal erfasst, unter Kennung des weiteren Fahrzeugmerkmals ein dynamischer Schlüssel generiert, die Bildaufnahme mittels des generierten dynamischen Schlüssels verschlüsselt, der Schlüssel verworfen, bei Verlassen der Überwachungsstrecke das weitere Fahrzeugmerkmal erfasst, bei einer festgestellten Überschreitung der Maximalgeschwindigkeit der Schlüssel mittels des weiteren bei Verlassen erfassten Fahrzeugmerkmals neu generiert, die verschlüsselte Bildaufnahme mittels des neu generierten Schlüssels zu entschlüsseln versucht, und nur bei einer erfolgreichen Entschlüsselung der Bildaufnahme das Fahrzeugmerkmal gespeichert wird.In order to avoid that such a "collision" of Kodierwerten to an unjustified appeal to a respectable vehicle owner, the invention provides in an advantageous embodiment that an identifying image taken of the incoming vehicle, another vehicle feature detected, under identification of the other Vehicle feature generated a dynamic key, the image capture using the generated dynamic key encrypted, discarded the key, when leaving the monitoring track detects the other vehicle feature, generated at a detected exceed the maximum speed of the key by means of the further recorded upon leaving the vehicle feature, the encrypted image capture means tries to decrypt the newly generated key, and only on successful decryption the image recording the vehicle feature is stored.

Dabei kann die Bildaufnahme insbesondere das charakteristische Fahrzeugmerkmal umfassen. Auch können das charakteristische und das weitere Fahrzeugmerkmal identisch sein.In this case, the image recording can in particular include the characteristic vehicle feature. Also, the characteristic and the other vehicle feature can be identical.

Beispielsweise wird eine Bildaufnahme des Kraftfahrzeugkennzeichens des einfahrenden Fahrzeugs verschlüsselt. Der Schlüssel für diese Verschlüsselung ist nicht "fest", sondern dynamisch, d.h. der Schlüssel wird für jedes einfahrende Fahrzeug neu generiert. Der dynamische Schlüssel wird dabei insbesondere ausgehend von dem weiteren Fahrzeugmerkmal generiert, welches grundsätzlich ein beliebiges Fahrzeugmerkmal, wie beispielsweise eine Fahrzeugfarbe oder eine Fahrzeugform, sein kann. Vorteilhafterweise wird aber auch für die Generierung des Schlüssels das Kraftfahrzeugkennzeichen herangezogen, da dieses jedes Fahrzeug eindeutig charakterisiert, so dass insbesondere der generierte Schlüssel für jedes Fahrzeug einmalig ist.For example, an image recording of the vehicle registration number of the entering vehicle is encrypted. The key to this encryption is not "fixed" but dynamic, i. the key is regenerated for each incoming vehicle. The dynamic key is thereby generated in particular on the basis of the further vehicle feature, which in principle can be any desired vehicle feature, such as a vehicle color or a vehicle shape. Advantageously, however, the motor vehicle license plate is also used for the generation of the key, since this characterizes each vehicle clearly, so that in particular the generated key is unique for each vehicle.

Nach dem Verschlüsseln der Bildaufnahme wird der Schlüssel wieder gelöscht, so dass auf diesen durch Unbefugte nicht mehr zurückgegriffen werden kann. Nur unter Kennung des weiteren Fahrzeugmerkmals kann der Schlüssel wieder regeneriert werden und die verschlüsselte Bildaufnahme wieder entschlüsselt werden. Andernfalls schlägt die Entschlüsselung fehl.After encrypting the image recording, the key is deleted again, so that it can no longer be accessed by unauthorized persons. Only under identification of the further vehicle feature, the key can be regenerated again and the encrypted image capture decrypted again. Otherwise, the decryption fails.

Wird nun anhand der Kodierwerte festgestellt, dass beispielsweise das Fahrzeug A, welches die Überwachungsstrecke verlässt, eine Geschwindigkeitsübertretung begangen hat, kann über die erfolgreiche Entschlüsselung eine Verwechslung von Fahrzeugen ausgeschlossen werden. Denn nur bei einer erfolgreichen Entschlüsselung handelt es sich um dasselbe Fahrzeug. Erst dann wird das charakteristische Fahrzeugmerkmal abgespeichert. Unbescholtene Fahrzeughalter gelangen somit nicht aufgrund einer Verwechslung in einen Datenbestand.If it is determined on the basis of the coding values that, for example, the vehicle A, which leaves the monitoring route, has committed a speeding violation, a confusion of vehicles can be ruled out via the successful decryption. Because only with a successful decryption is it the same vehicle. Only then is the characteristic vehicle feature stored. Unsuspected vehicle owners thus do not reach a database due to a confusion.

Für eine Dokumentation kann in einer weiteren Ausführung der Erfindung zusätzlich die Bildaufnahme abgespeichert werden.For documentation, the image acquisition can additionally be stored in a further embodiment of the invention.

In einer bevorzugten Ausgestaltung der Erfindung wird der erste und der zweite Kodierwert aus dem erfassten Fahrzeugmerkmal mittels eines Hash-Algorithmus' ermittelt. Ein derartiger Hash-Algorithmus dient im Allgemeinen zur Berechnung einer Streuwertfunktion, die auch als Hashfunktion bezeichnet wird. Hier wird insbesondere eine kryptographische Hashfunktion angesprochen, die beispielsweise häufig zur Speicherung von Passwörtern eingesetzt wird. Mittels des Hash-Algorithmus' wird der entsprechende Kodierwert als ein sogenannter Hashwert berechnet. Der Speicherbedarf eines derartigen Hashwertes ist im Allgemeinen sehr gering, so dass der Hash-Algorithmus insbesondere auch die schnelle und effektive Verarbeitung großer Datenmengen ermöglicht.In a preferred embodiment of the invention, the first and the second coding value from the detected vehicle feature is determined by means of a hash algorithm. Such a hash algorithm is generally used to calculate a scatter value function, which is also referred to as a hash function. Here, in particular, a cryptographic hash function is addressed, which is often used, for example, for storing passwords. By means of the hash algorithm, the corresponding coding value is calculated as a so-called hash value. The memory requirement of such a hash value is generally very low, so that the hash algorithm in particular also enables the fast and effective processing of large amounts of data.

Das Fahrzeugmerkmal kann beispielsweise ein einzelnes optisches Fahrzeugmerkmal sein, wie beispielsweise ein Kraftfahrzeugkennzeichen, eine Fahrzeugform oder eine Farbgestaltung. Ebenso ist es möglich eine Kombination verschiedener Fahrzeugmerkmale oder ein charakteristisches akustisches Signal des Fahrzeugs zu erfassen.The vehicle feature may be, for example, a single optical vehicle feature, such as a license plate, a vehicle shape, or a color design. It is also possible to detect a combination of different vehicle characteristics or a characteristic acoustic signal of the vehicle.

Vorzugsweise wird als Fahrzeugmerkmal ein Nummernschild des Fahrzeugs erfasst. Durch das Nummernschild ist es auf besonders einfache Weise möglich, das Fahrzeug zu charakterisieren. Das Nummernschild wird dabei beispielsweise mittels einer Kamera erfasst, so dass auf schon vorhandene Überwachungskameras, die z.B. für eine anderweitige Verkehrsüberwachung im Straßenverkehr genutzt werden, zurückgegriffen werden kann.Preferably, a license plate of the vehicle is detected as a vehicle feature. The license plate makes it possible to characterize the vehicle in a particularly simple way. The license plate is thereby detected, for example, by means of a camera, so that already existing surveillance cameras, e.g. can be used for other traffic monitoring in road traffic.

Vorteilhafterweise wird das Kraftfahrzeugkennzeichen des Nummernschilds mittels einer automatischen Kennzeichenerkennung erfasst. Das Nummernschild umfasst in der Regel eine Vielzahl an Merkmalen, wie beispielsweise eine charakteristische Form oder Farbgebung, eine.Länderkennung und das Kraftfahrzeugkennzeichen. Das Kraftfahrzeugkennzeichen ist aber in der Regel ausreichend, um das Fahrzeug eindeutig zu charakterisieren. Dadurch ist es insbesondere möglich, die zu verarbeitende Datenmenge effektiv zu reduzieren. Bei einer automatischen Kennzeichenerkennung wird beispielsweise mittels einer optischen Schriftzeichenerkennung (OCR), im Speziellen mittels der LPR (License Plate Recognition) oder der ANPR (Automatic Number Plate Recognition), das Kraftfahrzeugkennzeichen aus einem Bild des Fahrzeugs automatisch ermittelt. Die automatische Kennzeichenerkennung wird häufig zur Verkehrsüberwachung eingesetzt, so dass hier auf ein ausgereiftes Verfahren zurückgegriffen werden kann.Advantageously, the license plate of the license plate is detected by means of an automatic license plate recognition. The license plate usually includes a variety of features, such as a characteristic shape or color, a .Landkennung and the license plate number. However, the license plate is usually sufficient to clearly characterize the vehicle. This makes it possible, in particular, to effectively reduce the amount of data to be processed. In the case of automatic license plate recognition, the license plate number from an image of the vehicle is automatically determined, for example, by means of optical character recognition (OCR), in particular by means of the LPR (License Plate Recognition) or the ANPR (Automatic Number Plate Recognition). The automatic license plate recognition is frequently used for traffic monitoring, so that a mature procedure can be used here.

Wie schon erläutert, macht die Anwendung des Einweg-Verschlüsselungsverfahrens bei der Erzeugung des ersten und des zweiten Kodierwerts es nahezu unmöglich, die entsprechenden Kodierwerte zu "knacken", um dadurch auf das den Kodierwerten jeweils zugrunde liegende Fahrzeugmerkmal zu schließen. Allenfalls durch einen sogenannten "brute-force" Angriff bestünde die Möglichkeit, den entsprechenden Kodierwert zu knacken. Dabei wird unter einem "brute-force" Angriff ein "Knacken" des Kodierwerts durch das Ausprobieren sämtlicher möglicher Lösungen verstanden. Konkret hieße das, dass bei einem "brute-force" Angriff beispielsweise für jedes Kraftfahrzeugkennzeichen, das in einem amtlichen Kennzeichenregister vorliegt, der entsprechende Kodierwert berechnet würde, um dadurch das einem konkreten Kodierwert zugrunde liegende Kraftfahrzeugkennzeichen zu finden. Ein derartiges Szenario ist natürlich sehr unwahrscheinlich, da beispielsweise ein amtliches Kennzeichenregister in der Regel sicher vor unbefugtem Zugriff ist.As already explained, the use of the one-way encryption method in generating the first and second encoding values makes it almost impossible to "crack" the corresponding coding values, thereby inferring the underlying vehicle characteristic of each of the coding values. At most, by a so-called "brute-force" attack would be the opportunity to crack the corresponding coding value. A "brute-force" attack is understood to mean a "cracking" of the coding value by trying out all possible solutions. Concretely, this would mean that, for example, for a "brute-force" attack, the corresponding coding value would be calculated for each license plate present in an official license plate register in order to find the license plate number on which a specific coding value is based. Of course, such a scenario is very unlikely because, for example, an official license plate register is usually safe from unauthorized access.

Um insbesondere zu gewährleisten, dass selbst bei einem derartigen "brute-force" Angriff die entsprechenden Kodierwerte nicht "geknackt" werden können, wird in einer besonders vorteilhaften Ausgestaltung der Erfindung ein zusätzliches Fahrzeugmerkmal erfasst. Das bedeutet, dass zum ersten und zum zweiten Zeitpunkt jeweils zumindest zwei Fahrzeugmerkmale erfasst werden. Es wird also eine Kombination an Fahrzeugmerkmalen erfasst, beispielsweise das Kraftfahrzeugkennzeichen und ein zusätzliches Fahrzeugmerkmal. Der erste und der zweite Kodierwert sind dabei jeweils der erfassten Kombination an Fahrzeugmerkmalen zugeordnet. Da eine Kombination an Fahrzeugmerkmalen in der Regel in keiner Datenbank erfasst ist, kann durch die Erfassung des zusätzlichen Fahrzeugmerkmals gewährleistet werden, dass selbst durch einen "brute-force" Angriff nicht von dem entsprechenden Kodierwert beispielsweise auf das Kraftfahrzeugkennzeichen geschlossen werden kann. Prinzipiell ist in dieser Ausgestaltung der Erfindung die Erfassung einer beliebigen Kombination an akustischen und/oder optischen Fahrzeugmerkmalen möglich. Zweckmäßigerweise wird das Kraftfahrzeugkennzeichen und ein zusätzliches Fahrzeugmerkmal erfasst.In order to ensure in particular that even with such a "brute-force" attack the corresponding coding values can not be "cracked", in an especially advantageous embodiment of the invention an additional vehicle feature is detected. This means that at least two vehicle features are detected at the first and at the second time become. Thus, a combination of vehicle features is detected, for example, the vehicle registration number and an additional vehicle feature. The first and second coding values are in each case assigned to the detected combination of vehicle features. Since a combination of vehicle features is usually not recorded in any database, it can be ensured by detecting the additional vehicle feature that even by a "brute-force" attack can not be closed by the corresponding coding value, for example on the vehicle registration. In principle, the detection of any combination of acoustic and / or optical vehicle features is possible in this embodiment of the invention. Appropriately, the vehicle registration number and an additional vehicle feature is detected.

Vorteilhafterweise wird als zusätzliches Fahrzeugmerkmal ein optisches Merkmal des Fahrzeugs erfasst, insbesondere die Farbe des Fahrzeugs. Durch die Erfassung der Farbe des Fahrzeugs, insbesondere zusätzlich zum Kraftfahrzeugkennzeichen, ist es auf einfache Weise möglich, die Ermittlung des Kraftfahrzeugkennzeichens aus dem Kodierwert durch einen "brute-force" Angriff zu verhindern, da die Merkmalskombination von Kraftfahrzeugkennzeichen und Fahrzeugfarbe in keiner Datenbank erfasst ist.Advantageously, an optical feature of the vehicle is detected as an additional vehicle feature, in particular the color of the vehicle. By detecting the color of the vehicle, in particular in addition to the motor vehicle license plate, it is possible in a simple manner to prevent the identification of the motor vehicle license plate from the Kodierwert by a "brute-force" attack, since the feature combination of vehicle registration number and vehicle color is recorded in any database ,

Die auf eine Vorrichtung gerichtete Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des auf eine Vorrichtung gerichteten Patentanspruchs.The object directed to a device is achieved according to the invention by the features of the claim directed to a device.

Demnach umfasst die Vorrichtung zur Erfassung einer Geschwindigkeitsübertretung eines Fahrzeugs eine erste Überwachungsstation und eine zur ersten Überwachungsstation beabstandete zweite Überwachungsstation, sowie eine Kodiervorrichtung, eine Zeitmessvorrichtung und eine Rechenvorrichtung. Die Rechenvorrichtung ist mit der ersten und der zweiten Überwachungsstation, sowie mit der Kodiervorrichtung und der Zeitmessvorrichtung verbunden. Die erste und die zweite Überwachungsstation umfassen jeweils ein Erfassungsmittel, welches dafür eingerichtet ist, ein charakteristisches Fahrzeugmerkmal eines in eine Überwachungsstrecke einfahrenden und eines die Überwachungsstrecke verlassenden Fahrzeugs zu erfassen. Die Zeitmessvorrichtung ist dafür eingerichtet, einen ersten Zeitpunkt eines Einfahrens in die Überwachungstrecke und einen zweiten Zeitpunkt eines Verlassens der Überwachungsstrecke zu erfassen. Die Kodiervorrichtung ist dafür eingerichtet, mittels eines Einweg-Verschlüsselungsverfahrens aus den von der ersten und der zweiten Überwachungsstation erfassten Fahrzeugmerkmalen einen ersten bzw. einen zweiten Kodierwert zu ermitteln und die Rechenvorrichtung ist dafür eingerichtet, eine Durchschnittsgeschwindigkeit des Fahrzeugs innerhalb der Strecke zwischen der ersten und der zweiten Überwachungsstation anhand der Zeitsignale der Zeitmessvorrichtung zu ermitteln, und eine Überschreitung einer vorgegebenen Maximalgeschwindigkeit festzustellen und bei einer festgestellten Überschreitung das Fahrzeugmerkmal zu speichern.Accordingly, the device for detecting a speed violation of a vehicle comprises a first monitoring station and a second monitoring station spaced apart from the first monitoring station, as well as a coding device, a timing device and a computing device. The computing device is connected to the first and second monitoring stations, as well as to the coding device and the timing device. The first and second monitoring stations in each case comprise a detection means which is adapted to detect a characteristic vehicle feature of a vehicle entering a monitoring route and leaving a monitoring route. The time-measuring device is configured to detect a first time of entry into the monitoring path and a second time of exit of the monitoring path. The encoding device is configured to determine first and second encoding values from the vehicle features detected by the first and second monitoring stations, respectively, by a one-way encryption method, and the computing device is configured to set an average speed of the vehicle within the distance between the first and second encoder values determine second monitoring station based on the timing signals of the time measuring device, and to detect an exceeding of a predetermined maximum speed and to store the vehicle feature at a detected overrun.

Die für das Verfahren geschilderten Vorteile können dabei sinngemäß auf die Vorrichtung übertragen werden.The advantages described for the method can be transferred analogously to the device.

Die erste Überwachungsstation und die zweite Überwachungsstation sind voneinander beabstandet, so dass sie mit ihrem Abstand zueinander im Wesentlichen die Länge der Überwachungsstrecke vorgeben. Der Abstand der Überwachungsstationen voneinander kann beispielsweise mehrere hundert Meter oder einige Kilometer betragen.The first monitoring station and the second monitoring station are spaced apart from one another so that they essentially predetermine the length of the monitoring path with their distance from one another. The distance of the monitoring stations from each other, for example, be several hundred meters or a few kilometers.

Die erste und die zweite Überwachungsstation sind jeweils mit einem Erfassungsmittel ausgestattet. Mit dem Erfassungsmittel wird ein charakteristisches Fahrzeugmerkmal eines in die Überwachungsstrecke einfahrenden und eines die Überwachungsstrecke verlassenden Fahrzeugs erfasst.The first and the second monitoring stations are each equipped with a detection means. The detection means detects a characteristic vehicle characteristic of a vehicle entering the monitoring route and leaving the monitoring route.

Das Erfassungsmittel kann dabei zur Erfassung von optischen und/oder akustischen Fahrzeugmerkmalen ausgestaltet sein. Zur Erfassung akustischer Fahrzeugmerkmale umfasst das Erfassungsmittel beispielsweise ein Mikrofon. Zur Erfassung optischer Fahrzeugmerkmale umfasst das Erfassungsmittel zweckmäßigerweise eine Kamera, beispielsweise eine Videokamera oder eine Teleobjektivkamera. Eine derartige Kamera kann dabei derart positioniert sein, dass sie ein Bild des Heckbereichs des Fahrzeugs aufnimmt oder ein Bild eines anderen Bereichs des Fahrzeugs. Dabei wird das optische Fahrzeugmerkmal beispielsweise durch die Bildaufnahme als solche erfasst. Alternativ wird das optische Fahrzeugmerkmal aus der Bildaufnahme beispielsweise durch eine entsprechende Erkennungs-Software extrahiert und erfasst. Für die Erfassung des Kraftfahrzeugkennzeichens aus einer Bildaufnahme des Nummernschildes sind mit der entsprechenden Software häufig nur wenige Millisekunden nötig. Für eine derartige Verarbeitung der Bildaufnahmen umfasst das Erfassungsmittel beispielsweise einen entsprechenden Schaltkreis oder ist über eine Schnittstelle mit der Rechenvorrichtung verbunden.The detection means can be designed to detect optical and / or acoustic vehicle features. For detecting acoustic vehicle features, the detection means comprises for example, a microphone. For detecting optical vehicle features, the detection means expediently comprises a camera, for example a video camera or a telephoto camera. Such a camera may be positioned such that it takes a picture of the rear of the vehicle or an image of another area of the vehicle. In this case, the optical vehicle feature is detected, for example, by the image acquisition as such. Alternatively, the optical vehicle feature is extracted from the image acquisition, for example, by a corresponding recognition software and detected. For the detection of the license plate from an image of the license plate often only a few milliseconds are required with the appropriate software. For such processing of the image recordings, the detection means comprises, for example, a corresponding circuit or is connected via an interface to the computing device.

Um eine Aufnahme ausreichender Qualität durch die Kamera zu ermöglichen, können die Überwachungsstationen zusätzlich Lichtquellen umfassen, die das Fahrzeug beleuchten. Vorteilhaft ist in dem Zusammenhang ein Beleuchten durch eine Infrarot-Lichtquelle, um nächtliche Bildaufnahmen zu ermöglichen.In order to allow the camera to capture sufficient quality, the monitoring stations may additionally include light sources that illuminate the vehicle. In the context, lighting by an infrared light source is advantageous in order to enable nocturnal image recordings.

Anhand der von der ersten und der zweiten Überwachungsstation erfassten Fahrzeugmerkmale wird von der Kodiervorrichtung mittels eines Einweg-Verschlüsselungsverfahrens ein erster bzw. ein zweiter Kodierwert ermittelt. Die Kodiervorrichtung kann dabei als ein entsprechender Schaltkreis oder als eine Software in der Rechenvorrichtung, die beispielsweise als ein Computer gegeben ist, implementiert sein. Alternativ kann die Kodiervorrichtung als ein separater Rechner gegeben sein.On the basis of the vehicle characteristics detected by the first and the second monitoring station, the coding device determines a first or a second coding value by means of a one-way encryption method. The coding device can be implemented as a corresponding circuit or as software in the computing device, which is given for example as a computer. Alternatively, the coding device may be given as a separate computer.

Mittels der Zeitmessvorrichtung wird zum einen der erste Zeitpunkt erfasst, in dem ein Fahrzeug in die Überwachungsstrecke einfährt, also die erste Überwachungsstation passiert. Zum anderen wird der zweite Zeitpunkt erfasst, in dem das Fahrzeug die Überwachungsstrecke verlässt, also die zweite Überwachungsstation passiertBy means of the time measuring device, the first time is detected, in which a vehicle enters the monitoring route, that is, the first monitoring station passes. Second, the second time is recorded, in which The vehicle leaves the monitoring line, so the second monitoring station happens

Anhand der Zeitsignale, die die Zeitmessvorrichtung erzeugt, wird von der Rechenvorrichtung bei Fahrzeugidentifizierung anhand der Kodierwerte die Zeitspanne ermittelt, die das erfasste Fahrzeug zum Zurücklegen der Strecke zwischen der ersten und der zweiten Überwachungsstation benötigt. Dazu synchronisiert die Rechenvorrichtung beispielsweise die von der Zeitmessvorrichtung empfangenen Zeitsignale.On the basis of the time signals generated by the time-measuring device, the vehicle-type identification device uses the coding values to determine the time required for the detected vehicle to travel the distance between the first and the second monitoring stations. For this purpose, the computing device synchronizes, for example, the time signals received by the time-measuring device.

Aus der ermittelten Zeitspanne berechnet die Rechenvorrichtung, unter Einbeziehung der Länge der Überwachungsstrecke, eine Durchschnittsgeschwindigkeit des Fahrzeugs innerhalb der Überwachungsstrecke. Die Rechenvorrichtung vergleicht die ermittelte Durchschnittsgeschwindigkeit mit einer vorgegebenen Maximalgeschwindigkeit. Bei einer Überschreitung der vorgegebenen Maximalgeschwindigkeit speichert die Rechenvorrichtung das Fahrzeugmerkmal, also beispielsweise das Kraftfahrzeugkennzeichen, welches das die Überwachungsstrecke verlassende Fahrzeug charakterisiert.From the determined period of time calculates the computing device, including the length of the monitoring path, an average speed of the vehicle within the monitoring distance. The computing device compares the determined average speed with a predetermined maximum speed. If the predefined maximum speed is exceeded, the computing device stores the vehicle feature, that is to say, for example, the motor vehicle license plate which characterizes the vehicle leaving the monitoring route.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert. Dabei zeigt in einer schematischen Darstellung:

FIG 1
zwei Vorrichtungen zur Erfassung einer Geschwindig- keitsübertretung eines Fahrzeugs.
An embodiment of the invention will be explained in more detail with reference to a drawing. It shows in a schematic representation:
FIG. 1
two devices for detecting a speed violation of a vehicle.

Die Darstellung in FIG 1 zeigt zwei Vorrichtungen 2, 2' zur Erfassung einer Geschwindigkeitsübertretung, die zur Verkehrsüberwachung an einer 2-spurigen Autobahn 4 vorgesehen sind. Wie aus der Darstellung ersichtlich, ist jeweils eine der Vorrichtungen 2, 2' zur Überwachung einer der beiden Richtungsfahrbahnen 6, 8 vorgesehen.The representation in FIG. 1 shows two devices 2, 2 'for detecting a speed violation, which are provided for traffic monitoring on a 2-lane highway 4. As can be seen from the illustration, in each case one of the devices 2, 2 'is provided for monitoring one of the two directional lanes 6, 8.

Jede der Vorrichtungen 2, 2' umfasst zwei Überwachungsstationen 10, 12, die voneinander beabstandet sind, derart dass die Überwachungsstation 10 in Fahrtrichtung 14 gesehen vor der Überwachungsstation 12 liegt. Dadurch wird durch die Überwachungsstationen 10, 12 eine Überwachungsstrecke 13 vorgegeben. Der Abstand zwischen den Überwachungsstationen 10, 12 kann dabei mehrere Kilometer betragen.Each of the devices 2, 2 'comprises two monitoring stations 10, 12, which are spaced from each other, such that the Monitoring station 10 seen in the direction of travel 14 before the monitoring station 12 is located. As a result, a monitoring path 13 is predetermined by the monitoring stations 10, 12. The distance between the monitoring stations 10, 12 can be several kilometers.

Den Überwachungsstationen 10, 12 ist jeweils ein Erfassungsmittel 16 zugeordnet. Zusätzlich ist jeweils eine Zeitmessvorrichtung 18, eine Kodiervorrichtung 20, sowie eine Rechenvorrichtung 22 vorgesehen.The monitoring stations 10, 12 are each assigned a detection means 16. In addition, a timing device 18, a coding device 20, as well as a computing device 22 are provided in each case.

Mit dem Erfassungsmittel 16 wird ein das Fahrzeug 24, 26 charakterisierendes Fahrzeugmerkmal erfasst. In dem dargestellten Ausführungsbeispiel wird eine Kombination an optischen Fahrzeugmerkmalen, nämlich ein Kraftfahrzeugkennzeichen 30 eines Nummernschilds 23 und zusätzlich eine Farbe des entsprechenden Fahrzeugs 24, 26 erfasst. Zur Erfassung der entsprechenden optischen Fahrzeugmerkmale umfasst das Erfassungsmittel 16 eine Kamera 28. Mit der Kamera 28 wird eine Bildaufnahme des Heckbereichs gewonnen, die insbesondere auch das Nummernschild 23 des betreffenden Fahrzeugs 24, 26 abbildet. Aus der Bildaufnahme des Heckbereichs wird dann das Fahrzeugmerkmal, also das Kraftfahrzeugkennzeichen 30 und die Farbe des Fahrzeugs 24, 26, ermittelt. Das Kraftfahrzeugkennzeichen 30 wird hierbei insbesondere mittels einer automatischen Kennzeichenerkennung aus der Bildaufnahme erfasst.With the detection means 16, a vehicle characteristic characterizing the vehicle 24, 26 is detected. In the illustrated embodiment, a combination of optical vehicle features, namely a license plate 30 of a license plate 23 and additionally a color of the corresponding vehicle 24, 26 is detected. For detecting the corresponding optical vehicle features, the detection means 16 comprises a camera 28. The camera 28 acquires an image of the rear area, which in particular also images the license plate 23 of the respective vehicle 24, 26. From the image recording of the rear area then the vehicle feature, so the vehicle registration number 30 and the color of the vehicle 24, 26, determined. The vehicle registration number 30 is in this case detected in particular by means of an automatic license plate recognition from the image acquisition.

Der von dem Erfassungsmittel 16 erfassten Merkmalskombination aus Kraftfahrzeugkennzeichen 30 und Farbe des Fahrzeugs 24, 26 wird mittels der Kodiervorrichtung 20 ein erster bzw. zweiter Kodierwert zugeordnet. Die Kodiervorrichtung 20 ist hierzu als eine entsprechende Software der Rechenvorrichtung 22 realisiert. Der erste Kodierwert ist der erfassten Merkmalskombination eines in die Überwachungsstrecke 13 einfahrenden Fahrzeugs 24 zugeordnet. Der zweite Kodierwert ist der erfassten Merkmalskombination eines die Überwachungsstrecke 13 verlassenden Fahrzeugs 26 zugeordnet.The feature combination of motor vehicle license plate 30 and color of the vehicle 24, 26 detected by the detection means 16 is assigned a first or second coding value by means of the coding device 20. The coding device 20 is realized for this purpose as a corresponding software of the computing device 22. The first coding value is assigned to the detected feature combination of a vehicle 24 entering the monitoring route 13. The second coding value is assigned to the detected feature combination of a vehicle 26 leaving the monitoring route 13.

Der erste und der zweite Kodierwert sind der erfassten Merkmalskombination jeweils eindeutig zugeordnet. Jedes Fahrzeug 24, 26, welches in die Überwachungsstrecke 13 einfährt bzw. diese verlässt, erhält demnach einen "eigenen" ersten bzw. zweiten Kodierwert. Der erste und der zweite Kodierwert wird jeweils mittels eines Einweg-Verschlüsselungsverfahrens ermittelt. Dadurch ist es nahezu unmöglich, von dem ersten bzw. dem zweiten Kodierwert wieder zurück auf das den genannten Kodierwerten zugrunde liegende Fahrzeugmerkmal zu schließen. D.h. ein "Knacken" der Kodierwerte ist nahezu ausgeschlossen. Ein "Knacken" wäre theoretisch allenfalls durch einen "brute-force" Angriff denkbar. Durch die Erfassung der Merkmalskombination aus Kraftfahrzeugkennzeichen 30 und Fahrzeugfarbe wird das "Knacken" der Kodierwerte durch einen "brute-force" Angriff wirksam verhindert, da eine derartige Merkmalskombination in keiner Datenbank erfasst ist.The first and second coding values are each uniquely assigned to the detected feature combination. Each vehicle 24, 26, which enters or leaves the monitoring route 13, accordingly receives a "separate" first or second coding value. The first and second coding values are respectively determined by means of a one-way encryption method. As a result, it is almost impossible to return from the first or the second coding value back to the vehicle characteristic underlying the coding values mentioned. That a "cracking" of the coding values is almost impossible. A "cracking" would theoretically be possible at best by a "brute-force" attack. By detecting the feature combination of vehicle registration number 30 and vehicle color, the "cracking" of the coding values is effectively prevented by a "brute-force" attack, since such a combination of features is not recorded in any database.

Die folgenden Ausführungen dienen der Veranschaulichung der Wirkungsweise der Vorrichtung 2, 2'. Dazu wird exemplarisch eine Fahrt eines Fahrzeugs 24, 26 betrachtet.The following explanations serve to illustrate the operation of the device 2, 2 '. For this purpose, a drive of a vehicle 24, 26 is considered as an example.

Das in die Überwachungsstrecke 13 einfahrende Fahrzeug 24 passiert beim Einfahren zunächst die in Fahrtrichtung 14 vordere Überwachungsstation 10. Die vordere Überwachungsstation 10 erfasst mittels des ihr zugeordneten Erfassungsmittels 16 das Kraftfahrzeugkennzeichen 30 und die Farbe des einfahrenden Fahrzeugs 24.The retracting into the monitoring section 13 vehicle 24 happens when entering first the front in the direction of travel 14 monitoring station 10. The front monitoring station 10 detected by means of its associated detection means 16, the vehicle registration number 30 and the color of the incoming vehicle 24th

Der genannten Merkmalskombination aus Kraftfahrzeugkennzeichen 30 und Farbe des einfahrenden Fahrzeugs 24 wird mittels der Kodiervorrichtung 20 ein erster Kodierwert zugeordnet, der dem einfahrenden Fahrzeug 24 eindeutig zugeordnet ist.The said feature combination of motor vehicle license plate 30 and color of the incoming vehicle 24 is assigned by means of the coding device 20, a first Kodierwert which is uniquely associated with the retracting vehicle 24.

Zusätzlich erfasst die Zeitmessvorrichtung 18 beim Einfahren des Fahrzeugs 24 in die Überwachungsstrecke 13 einen ersten Zeitpunkt. Die Zeitmessvorrichtung 18 ist beispielsweise als ein entsprechender elektronischer Schaltkreis der Rechenvorrichtung 20 gegeben.In addition, the time measuring device 18 detects when entering the vehicle 24 in the monitoring section 13, a first time. The timing device 18 is given, for example, as a corresponding electronic circuit of the computing device 20.

Beim Verlassen der Überwachungsstrecke 13 passiert das Fahrzeug 26 die in Fahrtrichtung 14 hintere Überwachungsstation 12, wobei die Zeitmessvorrichtung 18 einen zweiten Zeitpunkt erfasst. Das Erfassungsmittel 16, welches der hinteren Überwachungsstation 12 zugeordnet ist, erfasst das Kraftfahrzeugkennzeichen 30 und die Farbe des die Überwachungsstrecke 13 verlassenden Fahrzeugs 26.When leaving the monitoring section 13, the vehicle 26 passes the rear in the direction of travel 14 monitoring station 12, wherein the timing device 18 detects a second time. The detection means 16, which is assigned to the rear monitoring station 12, detects the vehicle registration number 30 and the color of the vehicle 26 leaving the monitoring area 13.

Die Kodiervorrichtung 20 ordnet der Merkmalskombination aus Kraftfahrzeugkennzeichen 30 und Farbe des verlassenden Fahrzeugs 26 einen zweiten Kodierwert zu.The coding device 20 assigns the feature combination of motor vehicle license plate 30 and color of the leaving vehicle 26 to a second coding value.

Der zweite Kodierwert ist der genannten Merkmalskombination des verlassenden Fahrzeugs 26 eindeutig zugeordnet, d.h. jedes Fahrzeug, das die Überwachungsstrecke 13 verlässt, erhält einen "eigenen" zweiten Kodierwert. Dadurch ist es möglich mittels eines Vergleichs des ersten und des zweiten Kodierwerts festzustellen, ob das die Überwachungsstrecke 13 zum zweiten Zeitpunkt verlassende Fahrzeug 26 dasselbe ist, wie das zum ersten Zeitpunkt in die Überwachungsstrecke 13 eingefahrene Fahrzeug 24. Stimmen der erste und der zweite Kodierwert überein, so handelt es sich um dasselbe Fahrzeug.The second encoding value is uniquely associated with said feature combination of the leaving vehicle 26, i. Each vehicle leaving the monitoring route 13 receives a "unique" second coding value. This makes it possible to determine by means of a comparison of the first and second Kodierwerts whether the monitoring section 13 leaving the second time vehicle 26 is the same as the first time in the monitoring track 13 retracted vehicle 24. Voices of the first and the second Kodierwert match , so it is the same vehicle.

Bei einer Übereinstimmung ermittelt die Rechenvorrichtung 22 anhand der Zeitsignale der Zeitmessvorrichtung 18 die Zeitspanne, die das Fahrzeug 24, 26 zum Zurücklegen der Überwachungsstrecke 13 benötigte. Unter Einbeziehung der Länge der Überwachungsstrecke 13 ermittelt die Rechenvorrichtung 22 die Durchschnittsgeschwindigkeit des Fahrzeugs 24, 26 innerhalb der Überwachungsstrecke 13 und vergleicht die ermittelte Durchschnittsgeschwindigkeit mit einer vorgegeben Maximalgeschwindigkeit. Überschreitet die Durchschnittsgeschwindigkeit die vorgegebene Maximalgeschwindigkeit, speichert die Rechenvorrichtung 22 das Kraftfahrzeugkennzeichen 13 des Fahrzeugs 24, 26. Zusätzlich speichert die Rechenvorrichtung 22 hier auch eine Bildaufnahme, die den Heckbereich des entsprechenden Fahrzeugs 24, 26 darstellt.If there is a match, the computing device 22 uses the time signals of the time measurement device 18 to determine the time required for the vehicle 24, 26 to travel the monitoring route 13. Including the length of the monitoring section 13, the computing device 22 determines the average speed of the vehicle 24, 26 within the monitoring section 13 and compares the determined average speed with a predetermined maximum speed. If the average speed exceeds the predefined maximum speed, the computing device 22 stores the motor vehicle license plate 13 of the vehicle 24, 26. In addition, the computing device 22 also stores an image capture here, which represents the rear area of the corresponding vehicle 24, 26.

Claims (16)

  1. Method for capturing a speed violation by a vehicle (24, 26),
    wherein
    - a vehicle feature (30) characterizing a vehicle (24) entering a monitoring section (13) is captured at a first time,
    - the vehicle feature (30) from a vehicle (26) leaving the monitoring section (13) is captured at a second time,
    - an average speed of the vehicle (24, 26) is ascertained using the period of time required to cover the monitoring section (13),
    - the average speed is compared with a prescribed maximum speed, and
    - the vehicle feature (30) is stored only if the average speed is found to have exceeded the maximum speed,
    characterized in that
    - a one-way encryption method is used to ascertain a first and a second coding value which can each be associated with the vehicle feature (30) captured at the first and the second time, respectively,
    - the first and second coding values are compared with one another,
    - and the average speed is ascertained if the first and second coding values match.
  2. Method according to Claim 1,
    wherein
    - an identifying photograph of the entering vehicle (24) is taken,
    - a further vehicle feature is captured,
    - the further vehicle feature is identified to generate a dynamic key,
    - the photograph is encrypted using the generated dynamic key,
    - the key is discarded,
    - the further vehicle feature is captured when the monitoring section (13) is left,
    - the key is regenerated using the further vehicle feature captured upon exit if the maximum speed is found to have been exceeded,
    - an attempt is made to decrypt the encrypted photograph using the regenerated key, and
    - the vehicle feature (30) is stored only if the photograph is decrypted successfully.
  3. Method according to Claim 2,
    wherein the vehicle feature (30) and the photograph are stored if the maximum speed is found to have been exceeded and if the encrypted photograph is decrypted successfully.
  4. Method according to one of the preceding claims,
    wherein the first and second coding values are ascertained from the captured vehicle feature (30) using a hash algorithm.
  5. Method according to one of the preceding claims,
    wherein the vehicle feature captured is a license plate (23) on the vehicle (24, 26).
  6. Method according to Claim 5,
    wherein the motor vehicle registration (30) on the license plate (23) is captured by means of automatic license plate recognition.
  7. Method according to one of the preceding claims,
    wherein an additional vehicle feature is captured.
  8. Method according to Claim 7,
    wherein the additional vehicle feature captured is a visual feature of the vehicle, particularly the color of the vehicle (24, 26).
  9. Apparatus (2, 2') for capturing a speed violation by a vehicle (24, 26),
    - having a first monitoring station (10) and a second monitoring station (12) which is at a distance from the first monitoring station (10), which each comprise a capturing means (16) which is set up to capture a characteristic vehicle feature (30) of a vehicle (24) entering a monitoring section (13) and of a vehicle (26) leaving the monitoring section (13),
    - having a timing apparatus (18) which is set up to capture a first time of entry into the monitoring section (13) and a second time of exit from the monitoring section (13),
    - and having a computation apparatus (22) which is connected to the first and second monitoring stations (10, 12) and also to the timing apparatus (18) and which is set up to ascertain an average speed of the vehicle (24, 26) within the section between the first and second monitoring stations (10, 12) using the time signals from the timing apparatus (18), and to establish whether a prescribed maximum speed has been exceeded and to store the vehicle feature (30) if said maximum speed is found to have been exceeded,
    characterized by
    - a coding apparatus (20) which is set up to use a one-way encryption method to ascertain a first and a second coding value from the vehicle features (30) captured by the first and second monitoring stations (10, 12),
    - the computation apparatus (22) being connected to the coding apparatus (20) and being set up to compare the first and second coding values with one another and to ascertain the average speed when the first and second coding values match.
  10. Apparatus (2, 2') according to claim 9,
    wherein
    - the capturing means (16) is set up to take an identifying photograph of the entering vehicle (24) and to capture a further vehicle feature upon entry and upon exit,
    - the coding apparatus (20) is set up to identify the further vehicle feature to generate a dynamic key, to encrypt the photograph using the generated dynamic key, to discard the key, to regenerate the key using the further vehicle feature captured upon exit if the maximum speed is found to have been exceeded, and to decrypt the encrypted photograph using the regenerated key, and
    - the computation apparatus (22) is set up to store the vehicle feature (30) only if the photograph is decrypted successfully.
  11. Apparatus (2, 2') according to Claim 10,
    wherein the computation apparatus (22) is set up to additionally store the photograph if the maximum speed is found to have been exceeded and if decryption is successful.
  12. Apparatus (2, 2') according to one of Claims 9 and 10,
    wherein the coding apparatus (20) is set up to ascertain the first and second coding values using a hash algorithm.
  13. Apparatus (2, 2') according to one of Claims 9 to 12,
    wherein the capturing means (16) is set up to capture a license plate (23) on the vehicle (24, 26) as a vehicle feature.
  14. Apparatus (2, 2') according to Claim 13,
    wherein the capturing means (16) is set up to capture the motor vehicle registration (30) on the license plate (23) using automatic license plate recognition.
  15. Apparatus (2, 2') according to one of Claims 9 to 14,
    wherein the capturing means (16) is set up to capture an additional vehicle feature (30).
  16. Apparatus (2, 2') according to Claim 15,
    wherein the capturing means (16) is set up to capture a visual feature of the vehicle (24, 26), particularly the color of the vehicle (24, 26), as an additional vehicle feature.
EP08858840A 2007-12-10 2008-11-20 Method and device for detecting whether a vehicle has exceeded a speed limit Not-in-force EP2220634B1 (en)

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DE102007059346A DE102007059346B4 (en) 2007-12-10 2007-12-10 Method and device for detecting a speeding violation of a vehicle
PCT/EP2008/065898 WO2009074436A1 (en) 2007-12-10 2008-11-20 Method and device for detecting whether a vehicle has exceeded a speed limit

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EP2220634A1 (en) 2010-08-25
DE102007059346B4 (en) 2009-11-19
WO2009074436A1 (en) 2009-06-18
US20100302362A1 (en) 2010-12-02
IL205739A0 (en) 2010-11-30
ATE505776T1 (en) 2011-04-15
DE502008003223D1 (en) 2011-05-26
PL2220634T3 (en) 2011-09-30
DE102007059346A1 (en) 2009-06-18

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