WO2011000415A1 - Procédé et dispositif de surveillance du trafic routier - Google Patents

Procédé et dispositif de surveillance du trafic routier Download PDF

Info

Publication number
WO2011000415A1
WO2011000415A1 PCT/EP2009/058203 EP2009058203W WO2011000415A1 WO 2011000415 A1 WO2011000415 A1 WO 2011000415A1 EP 2009058203 W EP2009058203 W EP 2009058203W WO 2011000415 A1 WO2011000415 A1 WO 2011000415A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
light
directed
lobe
light intensity
Prior art date
Application number
PCT/EP2009/058203
Other languages
German (de)
English (en)
Inventor
Karl Asperger
Nikolai Rieger
Oskar Skuk
Wlodzimierz Krynicki
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/EP2009/058203 priority Critical patent/WO2011000415A1/fr
Priority to EP09780037A priority patent/EP2449540A1/fr
Publication of WO2011000415A1 publication Critical patent/WO2011000415A1/fr

Links

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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units

Definitions

  • the invention relates to a method and a device for monitoring road traffic, comprising image acquisition means, which are provided for receiving an image of a vehicle in a receiving position, with illuminants, which are provided for illuminating the vehicle, wherein the vehicle is a part with a highly reflective
  • Traffic violation for example at a
  • Picture of the picture is the vehicle in one
  • a strong illumination is due to the highly reflective property of the license plate disadvantageous because the automatic number plate recognition is affected by the bright retroreflection.
  • EP 1 650 724 A1 it is proposed in EP 1 650 724 A1 to arrange a filter which attenuates the light intensity of the flash light in the beam path of the flash unit. As a result, less light falls on the license plate, which also reduces the amount of reflected light, which reduces the risk of overexposure when taking photographs.
  • a flashlight with an upstream filter is technically complex and
  • Illumination such that directed onto the highly reflective surface of the license plate light radiation has a lower light intensity, as one on one
  • the device according to the invention for selectively illuminating the vehicle can be constructed comparatively simply, since the vehicle is always in a defined receiving position at the time the image is taken.
  • Speed radar or another detector can be specified. Usually, these devices are part of conventional traffic monitoring equipment.
  • Light-attenuating filters in the beam path of the flash or polarization filter are no longer required.
  • the illumination is energetically efficient.
  • an LED flash which generates a light lobe so that a directed to the reflective surface edge region of the light lobe has a lower light intensity than, for example, a directed to the roof of the vehicle Middle area of the light lobe.
  • the directed on the surface of the roof full light energy causes sufficient lightening to allow a safe color detection.
  • Light intensity which is at least 25% lower than the light intensity in the central region of the light lobe, which is directed to the roof of the vehicle.
  • Particularly advantageous may be a design of the light lobe, which has a solid angle between 6 ° and 20 °.
  • a favorable embodiment for a selective illumination of the vehicle may be characterized in that the illumination takes place with an LED flash. This can consist of at least two line by line in an LED array
  • LEDs exist.
  • a first LED array light emitting diodes are arranged so that their light radiation is directed to the vehicle roof.
  • a second LED array its light radiation points to the reflective surface of the license plate.
  • different light radiations can also be used with regard to the wavelength. Since the vehicle is always in a specific position (recording position) at the time of recording, a targeted illumination of a selected area can take place.
  • the selected area can be, for example, an area in which the license plate can be assumed with high probability.
  • Vehicle does not have to be fully illuminated.
  • the lower light intensity in the edge area of the light lobe avoids an over-radiation, so that the image information of the alphanumeric text can be safely extracted with a low computational complexity.
  • the maintenance and servicing of light-emitting diode arrays is less dangerous because LEDs are operated at a much lower voltage than a flash tube.
  • An LED flash unit also has a much faster response time than a flash tube that needs to be recharged.
  • An LED flash unit also allows the recording of short video sequences, with a larger
  • Flashlight device would be possible only by doubling or multiplying the flash unit.
  • Differences in the light intensity can be realized in a simple manner by the light emitting diodes by means of a control circuit intermittently, that is controlled with pulses predetermined pulse length. Suitable control circuitry is well known.
  • supplied drive pulses can in each array
  • the light lobe can be adapted very well for selective illumination.
  • Attachment lens and / or a reflector can be easily bundle the light radiation to a favorable selective illumination. For example, several areas of the surface of the vehicle can be illuminated with a different light intensity. These areas may be adjacent to each other, but also be interrupted by unilluminated areas. It can be cheap, if several pictures up to video sequences of one Vehicle be included, with one each
  • an embodiment of an LED flash unit may be preferred, wherein in each case one lens is connected in front of each light-emitting diode in the LED array and / or in each case a correspondingly aligned reflector is assigned. This arrangement allows the training very close
  • Luminosity of the flash (partial) is lower.
  • An embodiment of the luminous means may be preferred, in which the light-emitting diodes, the cone of radiation on a
  • painted area of the vehicle has a higher packing density in the array, than the packing density of the LEDs, whose beam cone on the strong
  • Reflective license plate is addressed. For the production can be advantageous if the
  • Attachment lenses and / or the associated reflector are each made of a plastic in injection molding.
  • the production costs are very low. It can be advantageous if the image acquisition means are set up for the automatic image evaluation of a vignette and / or the vehicle driver mounted on the vehicle.
  • Figure 1 is a schematic representation of a
  • an LED flash selectively illuminates a vehicle
  • FIG. 2 is a plan view of an embodiment of the LED flash of Figure 1 formed from a linear array of integrated lens LEDs;
  • FIG. 3 shows an LED flash according to FIG. 2 with auxiliary lenses in a plan view;
  • Figure 4 is a plan view of an embodiment of an LED flash, in which the LEDs are arranged in two LED array with different packing density.
  • FIG. 1 shows, in a greatly simplified sketch, a device 1 for monitoring vehicles in the vehicle
  • the device 1 is arranged on a support 20 above the vehicle height, a motor vehicle 5.
  • Cheap is a height of about 2 - 3 m.
  • the carrier may be a mast at the edge of a carriageway 2, or a signal bridge.
  • Device 1 comprises in known manner a camera 3 and a flash unit 4. It is connected to an evaluation device, not shown in detail. connected to a PC. This may be located near the device 1 or away from it.
  • the vehicle 5 is located at
  • the vehicle 5 has at the time of recording a defined distance from the device 1. This can be ensured, for example, that a speed evaluation unit (not shown) (eg a speed radar) or another sensor (eg an induction loop) the camera 4 and triggers the flash 3 This ensures that the photo of the vehicle 5 is always shot in an optimal focus area of the camera.
  • a speed evaluation unit eg a speed radar
  • another sensor eg an induction loop
  • the flash unit 4 is so high in FIG.
  • Exposure club about the roof of the car 5 aims.
  • the field of view of the camera 3 is not uniform, but flashed with different light intensity.
  • the illumination is lower than in the upper area 10 of the field of view of the camera 3. This ensures that the outgoing of the plate 9 retroreflectance
  • Front view of the vehicle which also an identification of the driver is possible.
  • Other areas of the vehicle can also be selectively illuminated.
  • the selective illumination according to the invention can not only be applied to a reflective part, but it is also possible to illuminate a plurality of differently reflecting parts with a respectively definable amount of light.
  • FIG. 2 shows a plan view of an embodiment of the LED flash.
  • the focusing optics has been removed.
  • the individual LEDs 16 are arranged in a linear array.
  • Each LED 16 is associated with a lens 21.
  • FIG 3 shows a plan view of Figure 2, but with the LEDs 16 is a focusing optics 21 connected upstream.
  • This focusing optics consists of a plastic part which, for the purpose of light bundling, can have facets which concentrate the light radiation and effect the selective illumination according to the invention.
  • FIG. 4 shows an embodiment of an LED flash

Abstract

L'invention concerne un procédé de surveillance du trafic routier, comprenant des moyens de saisie d'images (3) qui sont prévus pour prendre une image d'un véhicule (5) qui se trouve dans une position de prise de vue (6), des moyens d'éclairage (4) prévus pour éclairer le véhicule (5), le véhicule (5) présentant une partie (9) dotée d'une surface fortement réfléchissante, l'éclairage lors de la prise de l'image s'effectuant de telle sorte qu'une partie du rayonnement lumineux orientée sur la surface fortement réfléchissante présente une intensité lumineuse plus faible qu'une partie du rayonnement lumineux orientée sur une section de la surface du véhicule.
PCT/EP2009/058203 2009-06-30 2009-06-30 Procédé et dispositif de surveillance du trafic routier WO2011000415A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2009/058203 WO2011000415A1 (fr) 2009-06-30 2009-06-30 Procédé et dispositif de surveillance du trafic routier
EP09780037A EP2449540A1 (fr) 2009-06-30 2009-06-30 Procédé et dispositif de surveillance du trafic routier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/058203 WO2011000415A1 (fr) 2009-06-30 2009-06-30 Procédé et dispositif de surveillance du trafic routier

Publications (1)

Publication Number Publication Date
WO2011000415A1 true WO2011000415A1 (fr) 2011-01-06

Family

ID=41800366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/058203 WO2011000415A1 (fr) 2009-06-30 2009-06-30 Procédé et dispositif de surveillance du trafic routier

Country Status (2)

Country Link
EP (1) EP2449540A1 (fr)
WO (1) WO2011000415A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100518A2 (fr) * 2002-05-23 2003-12-04 Robot Visual Systems Gmbh Procede et systeme de prise de photographies d'un vehicule
EP1542192A1 (fr) * 2003-12-10 2005-06-15 Sagem SA Procede et systeme d'identification d'un vehicule en deplacement
DE102004044887A1 (de) * 2004-09-14 2006-03-30 Wienand, Hans-Theo, Dipl.-Ing. Verfahren und Vorrichtung zur Überwachung des Straßenverkehrs
US20070030675A1 (en) * 2005-08-08 2007-02-08 Oon Su L Light-emitting diode module for flash and auto-focus application
WO2007049176A1 (fr) * 2005-10-25 2007-05-03 Koninklijke Philips Electronics N.V. Diodes electroluminescentes multiples a optiques secondaires differentes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100518A2 (fr) * 2002-05-23 2003-12-04 Robot Visual Systems Gmbh Procede et systeme de prise de photographies d'un vehicule
EP1542192A1 (fr) * 2003-12-10 2005-06-15 Sagem SA Procede et systeme d'identification d'un vehicule en deplacement
DE102004044887A1 (de) * 2004-09-14 2006-03-30 Wienand, Hans-Theo, Dipl.-Ing. Verfahren und Vorrichtung zur Überwachung des Straßenverkehrs
US20070030675A1 (en) * 2005-08-08 2007-02-08 Oon Su L Light-emitting diode module for flash and auto-focus application
WO2007049176A1 (fr) * 2005-10-25 2007-05-03 Koninklijke Philips Electronics N.V. Diodes electroluminescentes multiples a optiques secondaires differentes

Also Published As

Publication number Publication date
EP2449540A1 (fr) 2012-05-09

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