EP1650724B1 - Method and device for monitoring road traffic - Google Patents
Method and device for monitoring road traffic Download PDFInfo
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- EP1650724B1 EP1650724B1 EP05108415A EP05108415A EP1650724B1 EP 1650724 B1 EP1650724 B1 EP 1650724B1 EP 05108415 A EP05108415 A EP 05108415A EP 05108415 A EP05108415 A EP 05108415A EP 1650724 B1 EP1650724 B1 EP 1650724B1
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- light
- flashgun
- vehicle
- camera
- attenuating filter
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012544 monitoring process Methods 0.000 title claims abstract description 6
- 238000002834 transmittance Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims 4
- 238000011496 digital image analysis Methods 0.000 claims 1
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 3
- 230000003292 diminished effect Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 238000012806 monitoring device Methods 0.000 description 7
- 238000010191 image analysis Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- 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
Definitions
- the invention relates to a method and a device for monitoring road traffic with a camera for receiving vehicles, which have at least one highly reflective part, and with a flash unit for illuminating the vehicles.
- the invention addresses the problem of reliably detecting vehicles with highly reflective license plates with photographic traffic surveillance systems.
- Traffic surveillance systems are used, for example, at intersections to detect vehicles crossing a red traffic light.
- Such systems are also used in conjunction with speedometers to detect vehicles traveling too fast. In this case, especially in bad weather or during the dark the recorded vehicle must be brightly lit so that the driver of the vehicle for reasons of reasoning in the photo is easily recognizable.
- This is usually done with an electronic flash unit, which generates a flashlight with a gas discharge lamp.
- the number plate of the vehicle must be clearly visible in order to identify the vehicle and its holder.
- the publication DE 35 35 588 A1 proposes to place in the photographic camera a filter that covers only part of the visual field.
- the filter is attached, for example, as a strip in the lower portion of the recording, which is usually the license plate of the vehicle to be identified.
- Object of the present invention is to provide a novel method and a novel device of the type mentioned, which reliably avoid overexposure by highly reflective license plates.
- a lichtabschwarraender filter is arranged in the beam path of the flash device, which attenuates the incident on the strong reflecting part light of the flash device, wherein the light attenuating filter is disposed on a portion of a light-transmissive element.
- the proposed displacement of the filter from the camera into the flash unit eliminates the cause of overexposure.
- the fact that the flashlight which strikes the license plate is already attenuated on the flash unit, the feared overexposures do not occur.
- the camera can record the vehicle illuminated by the flashlight without a filter. On one single photograph, the flashlight on the one hand, the windshield and the driver sitting behind it are strongly illuminated and through the filter on the other hand the license plate is illuminated so that there is no overexposure on the photographic image.
- the proposed method and apparatus are suitable for use in conjunction with film cameras as well as with digital still cameras, which convert the captured image into digital image data via a CCD sensor.
- the translucent element may be constructed in the manner of a slide. It consists of a transparent film, wherein the filter is realized by a colored portion of the film.
- the light-transmissive element may be an LCD surface whose local light transmittance is electronically controllable.
- LCD surfaces are known by flat screens. They have a liquid crystal layer, which is arranged on a transparent carrier made of glass or plastic. By applying a voltage to individual liquid crystal elements whose light transmittance can be changed. In this way, can be adjusted by an electronic control precisely the area that is darkened by the filter.
- this embodiment is advantageous in connection with digital cameras.
- Modern picture analysis programs can be used to quickly determine where the picture is taken, the windshield and where the recording is the highly reflective license plate.
- this information can be extracted by means of an image analysis of the continuously recorded by a digital camera image data.
- the filtering section of the LCD surface can be selected such that the windshield is brightly lit and the license plate is darkened.
- a projection optics can be used, which images the light-attenuating filter on the vehicle.
- the flash device may be similar to a slide projector and include an objective lens which generates a sharp image of the light attenuating filter in the plane of the vehicle to be recorded. This creates a clear dividing line between the filtered and non-filtered area. Transitions are avoided.
- the sharp image of the filter on the vehicle ensures that the desired reduced illumination is achieved in the area of the license plate.
- the recording can be done with a lower flash output, which extends the life of the flash.
- the projection optics may further comprise a condenser lens which focuses the light of the flashlamp on the filter to be imaged and the objective lens and optimizes the illumination.
- the flash unit may be conventionally provided with a gas-discharge flash lamp and a reflector for generating the flash.
- a roadway 1 is shown, on which a vehicle 2 drives.
- a traffic monitoring device 3 is arranged according to the invention.
- the monitoring device 3 comprises a digital camera 4 and a flash unit 5, which is formed by a flashlamp 6 within a reflector 7.
- a condenser lens 8 is arranged in the beam path of the flash unit 5 and in front of the light exit of the reflector 7, a condenser lens 8 is arranged. Again in front of the translucent element 9 and near the light exit from the light exit opening 10 of the traffic monitoring device 3 is an objective lens 11. The condenser lens 8 bundles the light of the light source, so that it is substantially completely the objective lens 11 impinges.
- the objective lens 11 images the image on the flat transmissive member 9 in a plane close to the front of the vehicle 2.
- the flash unit 5 is constructed like a slide projector and ensures optimal bright illumination of the windshield of the vehicle, the area of the license plate is darkened. Since the number plate of most vehicles is in a certain height range, the translucent element 9 may consist of a transparency in the form of a translucent disc having a filtering strip in the lower region.
- the translucent element 9 is an LCD surface whose light transmission is locally controllable.
- the data of the digital still camera 4 are supplied via a data line 12 to an image analysis unit 13 comprising a microprocessor.
- the image analysis unit 13 can continuously evaluate the images taken by the digital camera 4 and determine where in the image the brightly reflecting license plate is.
- Via a control line 14, in accordance with the data of the image analysis, the LCD panel 9 is controlled so that the area of the license plate is darkened. A non-reflective license plate is present on the vehicle, can be dispensed with the darkening of the flash.
- the objective lens 11 images the image of the LCD surface 9 substantially in the plane of the vehicle. If the vehicle distance to the digital camera 4 can vary, the objective lens 11 can be adjusted, so that the imaging takes place substantially exactly in the vehicle level. For this purpose, a second control line 15 is provided.
- the distance of the vehicle, the image analysis unit 13 can be determined based on distance measurement data of a built-in the digital camera 4 rangefinder or by analyzing the digital image.
- Fig. 3 shows the illumination of the vehicle 2 with the device according to the invention. It can be seen that the lower portion of the vehicle 2 is located in a darkened zone 16. This ensures that the highly reflective license plate 17 of the vehicle 2 is illuminated with a reduced light intensity.
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Überwachung des Straßenverkehrs mit einer Kamera zur Aufnahme von Fahrzeugen, welche mindestens ein stark reflektierendes Teil aufweisen, und mit einem Blitzlichtgerät zur Ausleuchtung der Fahrzeuge.The invention relates to a method and a device for monitoring road traffic with a camera for receiving vehicles, which have at least one highly reflective part, and with a flash unit for illuminating the vehicles.
Insbesondere widmet sich die Erfindung dem Problem, Fahrzeuge mit stark reflektierenden Nummernschildern mit fotografischen Verkehrsüberwachungsanlagen zuverlässig zu erfassen. Verkehrsüberwachungsanlagen werden beispielsweise an Kreuzungen eingesetzt, um Fahrzeuge zu erfassen, die eine Ampel bei Rot überqueren. Derartige Anlagen werden ebenfalls in Verbindung mit Geschwindigkeitsmeßgeräten eingesetzt, um zu schnell fahrende Fahrzeuge zu erfassen. Dabei muß insbesondere bei schlechter Witterung oder während der Dunkelheit das aufzunehmende Fahrzeug hell ausgeleuchtet werden, damit der Fahrer des Fahrzeuges aus Gründen der Beweisführung auf dem Foto gut erkennbar ist. Dies erfolgt in aller Regel mit einem elektronischen Blitzgerät, welches mit einer Gasentladungslampe ein Blitzlicht erzeugt. Gleichzeitig muß das Nummernschild des Fahrzeugs gut erkennbar sein, um das Fahrzeug und dessen Halter identifizieren zu können.In particular, the invention addresses the problem of reliably detecting vehicles with highly reflective license plates with photographic traffic surveillance systems. Traffic surveillance systems are used, for example, at intersections to detect vehicles crossing a red traffic light. Such systems are also used in conjunction with speedometers to detect vehicles traveling too fast. In this case, especially in bad weather or during the dark the recorded vehicle must be brightly lit so that the driver of the vehicle for reasons of reasoning in the photo is easily recognizable. This is usually done with an electronic flash unit, which generates a flashlight with a gas discharge lamp. At the same time the number plate of the vehicle must be clearly visible in order to identify the vehicle and its holder.
Moderne Fahrzeuge sind mit stark reflektierenden Nummernschildern ausgerüstet. Hierdurch soll die visuelle Identifizierung des Nummernschildes, beispielsweise im Scheinwerferlicht eines nachfolgenden Wagens, erleichtert werden. In Verbindung mit der genannten Verkehrsüberwachungsanlage stellt sich das Problem, daß das stark reflektierende Nummernschild das Licht des Blitzgerätes zurückwirft und die fotografische Aufnahme derart überbelichtet, daß eineModern vehicles are equipped with highly reflective license plates. As a result, the visual identification of the license plate, for example, in the headlight of a subsequent car to be facilitated. In connection with said traffic monitoring system, the problem arises that the highly reflective license plate throws back the light of the flash unit and overexposing the photograph so that a
Die Druckschrift
Ein derartiger Eingriff in die Kamera kann sich als kompliziert erweisen. Außerdem besteht keine Möglichkeit, den gefilterten Bereich von Aufnahme zu Aufnahme zu ändern. Falls das Nummernschild eines Fahrzeuges beispielsweise außerhalb des Filters liegt, wird es aufgrund der Überbelichtung nicht erkennbar sein.
Aus
Out
Aufgabe der vorliegenden Erfindung ist es, ein neuartiges Verfahren und eine neuartige Vorrichtung der eingangs genannten Art zu schaffen, welche eine Überbelichtung durch stark reflektierende Nummernschilder zuverlässig vermeiden.Object of the present invention is to provide a novel method and a novel device of the type mentioned, which reliably avoid overexposure by highly reflective license plates.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im Strahlengang des Blitzlichtgeräts ein lichtabschwächender Filter angeordnet wird, der das auf das stark reflektierende Teil auftreffende Licht des Blitzlichtgeräts abschwächt, wobei der lichtabschwächende Filter auf einem Teilbereich eines lichtdurchlässigen Elements angeordnet ist.This object is achieved in that a lichtabschwächender filter is arranged in the beam path of the flash device, which attenuates the incident on the strong reflecting part light of the flash device, wherein the light attenuating filter is disposed on a portion of a light-transmissive element.
Durch die vorgeschlagene Verlagerung des Filters aus der Kamera in das Blitzlichtgerät läßt sich die Ursache für eine Überbelichtung beseitigen. Dadurch, daß das Blitzlicht, welches auf das Nummernschild auftrifft, bereits am Blitzlichtgerät abgeschwächt wird, treten die befürchteten Überbelichtungen nicht auf. Die Kamera kann ohne Filter das durch das Blitzlicht ausgeleuchtete Fahrzeug aufnehmen. Auf einer einzigen fotografischen Aufnahme ist durch das Blitzlichtgerät einerseits die Windschutzscheibe und der dahinter sitzende Fahrer stark ausgeleuchtet und durch den Filter andererseits das Nummernschild abgeschwächt ausgeleuchtet, so daß auf der fotografischen Aufnahme keine Überbelichtung entsteht.The proposed displacement of the filter from the camera into the flash unit eliminates the cause of overexposure. The fact that the flashlight which strikes the license plate is already attenuated on the flash unit, the feared overexposures do not occur. The camera can record the vehicle illuminated by the flashlight without a filter. On one single photograph, the flashlight on the one hand, the windshield and the driver sitting behind it are strongly illuminated and through the filter on the other hand the license plate is illuminated so that there is no overexposure on the photographic image.
Das vorgeschlagene Verfahren und die vorgeschlagene Vorrichtung eignen sich zur Verwendung in Verbindung mit Filmkameras sowie mit digitalen Fotokameras, welche das aufgenommene Bild über einen CCD-Sensor in digitale Bilddaten umwandeln.The proposed method and apparatus are suitable for use in conjunction with film cameras as well as with digital still cameras, which convert the captured image into digital image data via a CCD sensor.
Das lichtdurchlässige Element kann nach Art eines Diapositivs aufgebaut sein. Es besteht aus einer transparenten Folie, wobei der Filter durch einen eingefärbten Teilbereich der Folie realisiert ist.The translucent element may be constructed in the manner of a slide. It consists of a transparent film, wherein the filter is realized by a colored portion of the film.
Bei einer alternativen Ausführungsform der Erfindung kann das lichtdurchläs-sige Element eine LCD-Fläche sein, deren lokale Lichtdurchlässigkeit elektronisch steuerbar ist. LCD-Flächen sind von Flachbildschirmen bekannt. Sie haben eine Flüssigkristallschicht, die auf einem transparentem Träger aus Glas oder Kunststoff angeordnet ist. Durch Anlegen einer Spannung an einzelne Flüssigkristall-Elemente kann deren Lichtdurchlässigkeit verändert werden. Auf diese Weise läßt sich durch eine elektronische Steuerung präzise der Bereich einstellen, der durch den Filter abgedunkelt ist.In an alternative embodiment of the invention, the light-transmissive element may be an LCD surface whose local light transmittance is electronically controllable. LCD surfaces are known by flat screens. They have a liquid crystal layer, which is arranged on a transparent carrier made of glass or plastic. By applying a voltage to individual liquid crystal elements whose light transmittance can be changed. In this way, can be adjusted by an electronic control precisely the area that is darkened by the filter.
Insbesondere ist diese Ausführungsform in Verbindung mit digitalen Kameras von Vorteil. Durch moderne Bild-Analyseprogramme läßt sich schnell ermitteln, an welchem Ort der Aufnahme die Windschutzscheibe und an welchem Ort der Aufnahme das stark reflektierende Nummernschild ist. In der Zeit kurz vor der Aufnahme können diese Informationen mittels einer Bildanalyse den kontinuierlich durch eine digitale Kamera aufgenommenen Bilddaten entnommen werden. Für die Beweisaufnahme kann dann der filternde Teilabschnitt der LCD-Fläche derart gewählt werden, daß die Windschutzscheibe hell ausgeleuchtet und das Nummernschild abgedunkelt ist.In particular, this embodiment is advantageous in connection with digital cameras. Modern picture analysis programs can be used to quickly determine where the picture is taken, the windshield and where the recording is the highly reflective license plate. In the time just before shooting, this information can be extracted by means of an image analysis of the continuously recorded by a digital camera image data. For the taking of evidence then the filtering section of the LCD surface can be selected such that the windshield is brightly lit and the license plate is darkened.
In der Praxis kann eine Projektionsoptik eingesetzt werden, die den lichtabschwächenden Filter auf das Fahrzeug abbildet. Hierbei kann das Blitzlichtgerät ähnlich einem Diaprojektor aufgebaut sein und eine Objektivlinse umfassen, welche ein scharfes Bild des lichtabschwächenden Filters in der Ebene des aufzunehmenden Fahrzeuges erzeugt. Es entsteht hierdurch eine klare Trennlinie zwischen dem gefilterten und nicht-gefilterten Bereich. Überblendungen werden vermieden. Durch die scharfe Abbildung des Filters auf das Fahrzeug ist sichergestellt, daß im Bereich des Nummernschildes die gewünschte reduzierte Ausleuchtung erzielt wird. Außerdem kann die Aufnahme mit einer geringeren Blitzleistung erfolgen, wodurch die Lebensdauer des Blitzlichtes verlängert wird. Die Projektionsoptik kann ferner eine Kondensorlinse umfassen, welche das Licht der Blitzlichtlampe auf den abzubildenden Filter und die Objektivlinse konzentriert und die Ausleuchtung optimiert.In practice, a projection optics can be used, which images the light-attenuating filter on the vehicle. Here, the flash device may be similar to a slide projector and include an objective lens which generates a sharp image of the light attenuating filter in the plane of the vehicle to be recorded. This creates a clear dividing line between the filtered and non-filtered area. Transitions are avoided. The sharp image of the filter on the vehicle ensures that the desired reduced illumination is achieved in the area of the license plate. In addition, the recording can be done with a lower flash output, which extends the life of the flash. The projection optics may further comprise a condenser lens which focuses the light of the flashlamp on the filter to be imaged and the objective lens and optimizes the illumination.
Das Blitzlichtgerät kann in herkömmlicher Weise mit einer Gasentladungs-Blitzlampe und einem Reflektor zur Erzeugung des Blitzes versehen sein.The flash unit may be conventionally provided with a gas-discharge flash lamp and a reflector for generating the flash.
Eine Ausführungsform der Erfindung wird nachfolgend unter Bezugnahme auf die beigefügten Zeichnungen erläutert. Hierbei zeigt
- Fig. 1
- eine an einem Fahrbahnrand angeordnete Verkehrsüberwachungsvorrichtung gemäß der Erfindung;
- Fig. 2
- eine schematische Darstellung der verschiedenen Elemente einer erfindungsgemäßen Verkehrsüberwachungsvorrichtung und
- Fig. 3
- eine schematische Darstellung der Ausleuchtung eines Fahrzeuges durch die erfindungsgemäße Überwachungseinrichtung.
- Fig. 1
- a roadside traffic monitoring device according to the invention;
- Fig. 2
- a schematic representation of various elements of a traffic monitoring device according to the invention and
- Fig. 3
- a schematic representation of the illumination of a vehicle by the monitoring device according to the invention.
In Fig. 1 ist eine Fahrbahn 1 dargestellt, auf der ein Fahrzeug 2 fährt. Am Rand der Fahrbahn 1 ist eine Verkehrsüberwachungsvorrichtung 3 gemäß der Erfindung angeordnet. Die Überwachungsvorrichtung 3 umfaßt eine Digitalkamera 4 und ein Blitzlichtgerät 5, welches von einer Blitzlichtlampe 6 innerhalb eines Reflektors 7 gebildet wird.In Fig. 1, a
Im Strahlengang des Blitzlichtgerätes 5 und vor dem Lichtaustritt des Reflektors 7 ist eine Kondensorlinse 8 angeordnet. Vor der Kondensorlinse 8 liegt ein ebenes, lichtdurchlässiges Element 9. Wiederum vor dem lichtdurchlässigen Element 9 und nahe dem Lichtaustritt aus der Lichtaustrittsöffnung 10 der Verkehrsüberwachungsvorrichtung 3 liegt eine Objektivlinse 11. Die Kondensorlinse 8 bündelt das Licht der Lichtquelle, so daß es im wesentlichen vollständig auf der Objektivlinse 11 auftrifft.In the beam path of the
Die Objektivlinse 11 bildet das Bild auf dem ebenen, lichtdurchlässigen Element 9 in einer Ebene ab, die nahe der Vorderseite des Fahrzeugs 2 liegt.The
Das Blitzlichtgerät 5 ist wie ein Diaprojektor aufgebaut und sorgt für eine optimale helle Ausleuchtung der Windschutzscheibe des Fahrzeuges, wobei der Bereich des Nummernschildes abgedunkelt ist. Da sich das Nummernschild der meisten Fahrzeuge in einem bestimmten Höhenbereich befindet, kann das lichtdurchlässige Element 9 nach Art eines Diapositivs aus einer lichtdurchlässigen Scheibe bestehen, welche im unteren Bereich einen filternden Streifen aufweist.The
Bei der Ausführungsform der Fig. 2 ist das lichtdurchlässige Element 9 eine LCD-Fläche, deren Lichtdurchlässigkeit lokal steuerbar ist. Die Daten der digitalen Fotokamera 4 werden über eine Datenleitung 12 einer Bildanalyseeinheit 13 zugeführt, welche einen Mikroprozessor umfaßt. Die Bildanalyseeinheit 13 kann kontinuierlich die durch die Digitalkamera 4 aufgenommenen Bilder auswerten und ermitteln, an welcher Stelle des Bildes das hell reflektierende Nummernschild ist. Über eine Steuerleitung 14 wird in Übereinstimmung mit den Daten der Bildanalyse die LCD-Fläche 9 gesteuert, so daß der Bereich des Nummernschildes abgedunkelt ist. Ein nicht reflektierendes Nummernschild an dem Fahrzeug vorhanden ist, kann auf die Abdunklung des Blitzes verzichtet werden.In the embodiment of FIG. 2, the
Die Objektivlinse 11 bildet das Bild der LCD-Fläche 9 im wesentlichen in der Ebene des Fahrzeuges ab. Wenn der Fahrzeugabstand zu der Digitalkamera 4 variieren kann, kann die Objektivlinse 11 verstellt werden, so daß die Abbildung im wesentlichen genau in der Fahrzeugebene erfolgt. Hierzu ist eine zweite Steuerleitung 15 vorgesehen. Den Abstand des Fahrzeuges kann die Bildanalyseeinheit 13 anhand von Entfernungs-Meßdaten eines in die Digitalkamera 4 eingebauten Entfernungsmessers oder anhand einer Analyse des digitalen Bildes ermitteln.The
Die Fig. 3 zeigt die Ausleuchtung des Fahrzeuges 2 mit der erfindungsgemäßen Vorrichtung. Es ist zu erkennen, daß der untere Bereich des Fahrzeuges 2 sich in einer verdunkelten Zone 16 befindet. Hierdurch ist sichergestellt, daß das stark reflektierende Nummernschild 17 des Fahrzeugs 2 mit einer reduzierten Lichtstärke angestrahlt wird.Fig. 3 shows the illumination of the
- 11
- Fahrbahnroadway
- 22
- Fahrzeugvehicle
- 33
- VerkehrsüberwachungsvorrichtungTraffic monitoring device
- 44
- DigiatalkameraDigiatalkamera
- 55
- BlitzlichtgerätFlashgun
- 66
- BlitzlichtlampeFlash lamp
- 77
- Reflektorreflector
- 88th
- Kondensorlinsecondenser
- 99
- ebenes lichtdurchlässiges Element, LCD-Flächeflat translucent element, LCD surface
- 1010
- LichtaustrittsöffnungLight opening
- 1111
- Objektivlinseobjective lens
- 1212
- Datenleitungdata line
- 1313
- BildanalyseeinheitImage analysis unit
- 1414
- Steuerleitungcontrol line
- 1515
- Steuerleitungcontrol line
- 1616
- verdunkelte Zonedarkened zone
- 1717
- stark reflektierendes Teil, Nummernschildstrong reflective part, license plate
Claims (13)
- A method of monitoring road traffic using a camera (4) for photographing vehicles (2) which have at least one highly reflective part (17), and using a flashgun device for illuminating the vehicles (2), characterised in that in the beam path of the flashgun device (5) there is arranged a light-attenuating filter (9), which attenuates the light from the flashgun device (5) falling on the highly reflective part (17), the light-attenuating filter being arranged on a portion of a light-transmitting element (9).
- A method according to claim 1, characterised in that the light-transmitting element is an LCD surface (9), whose local light transmittance is electronically controlled.
- A method according to one of the preceding claims, characterised in that the light transmittance of the LCD surface (9) is reduced in the area illuminating the number plate (17) of the vehicle (2).
- A method according to claim 3, characterised in that the camera (4) records the image via a digital image sensor and the area illuminating the number plate (17) of the vehicle (2) is determined automatically by means of the image on the digital image sensor.
- A method according to one of the preceding claims, characterised in that the light-attenuating filter is imaged onto the vehicle (2) by a projection optical system (8, 11).
- A device (3) for monitoring road traffic, having a camera (4) for photographing vehicles (2) which have at least one highly reflective part (17), and having a flashgun device (5) for illuminating the vehicles (2), characterised in that in the beam path of the flashgun device (5) there is arranged a light-attenuating filter (9), which attenuates the light from the flashgun device (5) falling on the highly reflective part (17), the light-attenuating filter being a portion of a light-transmitting element (9).
- A device (3) according to claim 6, characterised in that the light-transmitting element is a transparency.
- A device (3) according to claim 6, characterised in that the light-transmitting element is an LCD surface (9), whose local light transmittance is electronically controllable.
- A device (3) according to claim 8, characterised in that the camera (4) comprises a digital image sensor, a digital image analysis unit (13) being provided, which determines the area illuminating the number plate (17) of the vehicle (2) in the beam path of the flashgun device (5) automatically by means of the image on the digital image sensor.
- A device (3) according to one of claims 6 to 9, characterised by a projection optical system (8, 11) which images the light-attenuating filter (9) into a plane near the vehicle (2).
- A device (3) according to claim 10, characterised in that the projection optical system comprises an objective lens (11).
- A device (3) according to claim 10 or claim 11, characterised in that the projection optical system comprises a condenser lens (8).
- A device (3) according to one of claims 6 to 12, characterised in that the flashgun device (5) comprises a gas discharge flash lamp (6) and a reflector (7).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004044887A DE102004044887A1 (en) | 2004-09-14 | 2004-09-14 | Road traffic monitoring method for use in crossings, involves arranging light-diminishing filter in path of rays of flashgun for diminishing light of flashgun, where light impinges on strongly reflecting number plate of vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1650724A1 EP1650724A1 (en) | 2006-04-26 |
| EP1650724B1 true EP1650724B1 (en) | 2008-01-02 |
Family
ID=35840200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05108415A Active EP1650724B1 (en) | 2004-09-14 | 2005-09-14 | Method and device for monitoring road traffic |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1650724B1 (en) |
| AT (1) | ATE382924T1 (en) |
| DE (2) | DE102004044887A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2157558B1 (en) * | 2008-08-19 | 2015-05-06 | JENOPTIK Robot GmbH | Method and device for photographing a vehicle |
| WO2011000415A1 (en) * | 2009-06-30 | 2011-01-06 | Siemens Aktiengesellschaft | Method and device for monitoring road traffic |
| CN104702832B (en) * | 2015-03-31 | 2018-07-31 | 汕头市新视界电子有限公司 | A kind of imaging method and its equipment of the camera shooting of automobile safety monitoring |
| CN110944117B (en) * | 2019-11-15 | 2021-08-31 | 浙江大华技术股份有限公司 | Image processing method, computer equipment, storage device and intelligent monitoring system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2466060A1 (en) * | 1979-06-28 | 1981-03-27 | Sfim | MOTOR VEHICLE SPEED CONTROL SYSTEM |
| CA2020748A1 (en) * | 1989-08-22 | 1991-02-23 | Thomas F. Look | Method and apparatus for machine reading of retroreflective vehicle identification articles |
| US6650765B1 (en) * | 2000-01-11 | 2003-11-18 | Pulnix America, Inc. | System for simultaneously imaging vehicles and their license plates |
-
2004
- 2004-09-14 DE DE102004044887A patent/DE102004044887A1/en not_active Withdrawn
-
2005
- 2005-09-14 EP EP05108415A patent/EP1650724B1/en active Active
- 2005-09-14 AT AT05108415T patent/ATE382924T1/en not_active IP Right Cessation
- 2005-09-14 DE DE502005002387T patent/DE502005002387D1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004044887A1 (en) | 2006-03-30 |
| DE502005002387D1 (en) | 2008-02-14 |
| EP1650724A1 (en) | 2006-04-26 |
| ATE382924T1 (en) | 2008-01-15 |
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