EP1509812B1 - Procede et systeme de prise de photographies d'un vehicule - Google Patents

Procede et systeme de prise de photographies d'un vehicule Download PDF

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Publication number
EP1509812B1
EP1509812B1 EP03737906A EP03737906A EP1509812B1 EP 1509812 B1 EP1509812 B1 EP 1509812B1 EP 03737906 A EP03737906 A EP 03737906A EP 03737906 A EP03737906 A EP 03737906A EP 1509812 B1 EP1509812 B1 EP 1509812B1
Authority
EP
European Patent Office
Prior art keywords
ray bundle
lens
imaging
image
wedge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03737906A
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German (de)
English (en)
Other versions
EP1509812A2 (fr
Inventor
Uwe Schaller
Wolfgang Seidel
Ullrich Krüger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robot Visual Systems GmbH
Original Assignee
Robot Visual Systems GmbH
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 Robot Visual Systems GmbH filed Critical Robot Visual Systems GmbH
Publication of EP1509812A2 publication Critical patent/EP1509812A2/fr
Application granted granted Critical
Publication of EP1509812B1 publication Critical patent/EP1509812B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 an arrangement for the photographic recording of a vehicle, with which an image document (front photo) is created, which is suitable to identify both the driver and the license plate clearly and tamper-proof.
  • the passenger compartment and thus the driver must be sufficiently illuminated.
  • This is independent of daylight in a distance range of the vehicle from the recording device usually between 30 m and 12 m and at a vehicle speed of up to 250 km / h only with an additional flash light possible.
  • the retroreflective characteristic reflects the radiation almost 100%. D.
  • the wet film is still preferred in traffic photography. Extremely differently illuminated pixels can be processed by elaborate rework when developing the film within certain limits, so that the image information is visible.
  • DE 35 35 588 A1 discloses a method and a device for photographing strongly illuminated or reflecting parts of a field of view to be photographed.
  • a retroreflective mark of a Vehicle together with the other, normally lit parts of the field of view to be able to take photographs
  • a light-attenuating filter is applied in the image plane of the camera, which extends across the image plane.
  • the brightness of the image is attenuated in the area covered by the filter.
  • the image of the license plate must arise in the area of the filter. That means the camera has to be very precisely aligned with the vehicle.
  • DE 198 02 811 A1 is spoken by an improved identification of the driver and the license plate by a larger number of images and using a contrast method. However, no further details are provided.
  • DE 297 18 274 U1 discloses a camera recorder for speed measuring devices, which is distinguished by a graduated filter set in front of the objective.
  • This semi-colored filter with a smooth transition from the dark to the bright part is used in such a way that the darker part attenuates in particular the reflection of the mark.
  • the locally differentiated attenuation can only be completely inadequate until it does not act when the filter is near or in the entrance pupil of the objective.
  • EP 0621 572 A1 proposes a method and a device in which two different image sections of a traffic scene are simultaneously recorded with two digital cameras at a different angle. The electronic image data of both images are stored together for evidence security.
  • the indicator when recorded at an angle greater than the angle of the retroreflection, no longer outshines, while the faint scenery was taken at a rather small angle becomes.
  • Such a solution requires only by the need of two cameras (recording devices) a high technical effort and a high outlay for installation on site.
  • DE 199 60 888 A1 describes a method and a device in which at least two images of different brightness are generated from the image data of a photograph.
  • the first 8 bits of the CCD sensor which contain more usable information about the light content, are read out as a dark image, which makes it easier to identify the very bright radiating license plate.
  • the last 8 bits of the sensor generate the bright image, which contains more usable information about the dark portion of the image and thus driver.
  • these two digital images should be combined with each other so that an image is formed on which you can recognize both the license plate and the driver at least better. Whether the recognizability of the license plate in any case is given, seems doubtful.
  • the device according to the invention should advantageously be able to be created by retrofitting commercially available recording devices for traffic photography. Preferably, this retrofitting should be possible without intervention in the hardware of the recording device and without a necessary adjustment to the recording device by the user.
  • the working regime eg triggering the recording and the flash, performance of the flash, reading, saving and evaluating the image information
  • the user should not change the handling.
  • the object of the invention is achieved for a method according to the preamble of claim 1 in that the imaging beam bundle reflected by the vehicle and causing the image is split into two partial beams, the first partial beam having only an insensitely lower light intensity than that of the entire imaging beam, generates a first image on which the driver is clearly visible, while the second partial beam with a light intensity of less than 5% than that of the entire imaging beam, generates a second image on which the license plate is clearly visible and that the two geometrically identical images on the Recording medium to each other at the same time, spatially offset generated and stored.
  • the object is achieved in that in the beam path of the imaging beam means are provided for dividing the imaging beam into two mutually offset partial beams of different intensity, on the recording medium two geometrically identical images of different intensity effect with a local offset to each other wherein the first partial beam with an imperceptibly lower light intensity than that of the entire imaging beam generates a first image, while the second partial beam with a light intensity less than 5% than that of the entire imaging beam generates a second image, so that the first Image of the driver and the second image the license plate well lit and recognizable maps.
  • the essence of the method according to the invention is that with a single image of an object field, two geometrically identical images of the object field on the same recording medium are generated offset from each other. It is essential to the invention that the second image is generated with a very low light intensity, less than 5%, preferably less than 1%, while for the first image as far as possible the remaining light intensity, which can be up to greater than 99% of the incident radiation in the lens can, is used.
  • the first image only imperceptibly lower in light intensity compared to the image with full light intensity, reflects the full object field, whereby as in conventional photographs of the driver in the passenger compartment illuminated by the flashlight is easily visible and the highly reflective indicator often appears only as an overridden light spot.
  • the second image is almost completely dark due to the low light intensity, except for the license plate, which is optimally exposed here.
  • the two images are offset relative to one another in such a way that the mark which can be recognized in the second image is imaged onto the recording medium to where the low-contrast regions from the first image are imaged without usable image information.
  • the area below the vehicle is used here. Practical experiments have shown that, especially when using electronic recording media (CCD sensor) due to the low dynamics no ghosting.
  • the usable image information of the second image (only the flag) is projected onto an area of the first image in which no usable image information (only road surface) is present.
  • the image information of both images are simultaneously stored and processed as a single image.
  • a wet film used as a recording medium undergoes one-time exposure as just described for a CCD sensor.
  • Vehicle drivers and license plates are legally recorded clearly and manipulation-proof with the identical imaging optics and stored in an overall image or a data record.
  • Decisive for the ratio of the light intensity to be implemented for the two images is the amount of light with which the indicator is optimally imaged. Since this ratio is device-technically feasible and thus the second image determining amount of light very small, even less than 1% can be selected, there is the principle possibility regardless of the traffic-technical possibilities to direct the recording device frontally on the vehicle.
  • the solutions shown in the prior art which attempt with only modest success by optical attenuation to solve the problem of the overexposed mark, here is the total incident in the lens amount of light for the generation of the image (here consisting of two overlapping Images).
  • All arrangement variants basically consist of a lens (means for generating an imaging beam), a recording medium, such as a wet film (chemical storage) or an electronic sensor arrangement (electronic storage) arranged in the image plane of the lens (means for imaging the two images and storing the image data ) and means for dividing the imaging beam and for offsetting the resulting partial beams.
  • the means for dividing the imaging beam and for the offset of the resulting partial beams differs for the individual performance variants essentially by the physical principle realized by them, the resulting concrete technical realization and their arrangement within the arrangement variant.
  • these means can be arranged in front of the objective, inside the objective or between the objective and the recording medium.
  • the imaging beam between object and lens is a parallel beam.
  • the means for separating the beam may be based on physical beam splitting eg with a splitter cube, a prism, a coated splitter plate or a Fresnel splitter plate, as well as on geometric beam splitting by pupil division with fixed or variable division ratio.
  • the offset of the partial beams can be effected by an image angle offset, for example with a wedge, a rotary wedge pair, a prism or an angle mirror (fixed or variable) or a parallel beam offset, for example with a plane plate (fixed or variable). All of these specific technical means as well as others which are suitable instead are known to the person skilled in the art.
  • the optical processing is particularly advantageous in the parallel beam path in front of the lens 1, describe all subsequent embodiments arrangements consisting of a recording device 4 with a lens 1, a recording medium 2 in the image plane of the lens 1, which is both a wet film
  • the objective lens 3 is constructed differently for the individual embodiments, in particular, the individual embodiments comprise different concrete technical means for processing the beam integrated in the lens attachment. 3
  • FIGS. 1a and 1b A first embodiment is shown in FIGS. 1a and 1b. Shown is a recording device 4, of the stylized housing parts shown only necessary for the understanding of the invention assemblies, namely the lens 1 and the recording medium 2 are shown.
  • the lens attachment 3 is screwed over an existing on the recording device 4 lens filter thread 5 via an outer ring 6.
  • a circular segment-shaped optical wedge 8 is fixed at an angle ⁇ .
  • the pupil opening 9 is geometrically divided into two sub-areas, while the division ratio and the resulting intensity distribution for the two resulting partial beams of the dimensioning of the wedge surface 10 is determined.
  • the retaining ring 7 is rotatably mounted in the outer ring 6 and can be adjusted by the operator by means of a hole key engaging in holes 12 so that an exactly vertical offset of the second image, which is formed by the partial beam extending through the wedge 8, relative to the first image which is created by the uninfluenced partial beam.
  • the image location 13 of the first partial beam which passes unchanged through the remaining free surface 11 of the pupil opening 9, arises as usual on the optical axis of the lens 1 in the plane of the recording medium 2.
  • the passing through the wedge 8 second partial beam strikes at the Keilablenkwinkel ⁇ 1 on the lens 1 and is so offset to the optical axis on the recording medium 2 imaged (image location 14 of the second partial beam).
  • the lens attachment 3 has on its front side facing away from the lens 1 a thread of the same dimensions as the lens filter thread 5.
  • An extension of the arrangement according to the invention would be a mechanical displacement unit which makes the wedge 8 displaceable in the radial direction.
  • an optimization of the brightness of the second image of the current lighting situation could be performed.
  • a lens attachment 3 is shown for a second embodiment. This lens attachment 3 is mounted analogously to the first embodiment of a recording device 4.
  • a plan plate pair 15 is provided here as an optical means, which encloses a fixed angle ⁇ enclosing in the retaining ring 7.
  • the flat plate pair 15 represents an angle mirror with a fixed angle.
  • the ray bundle entering the pupil is transformed into a passing and entering surface according to Fresnel's laws on the surface of the plane plates, which each represent an optical interface (glass - air or air - glass) split partial beam reflected.
  • the penetrating partial beam is within the meaning of the invention the first partial beam, which is used for visible imaging of the driver, while the reflected partial beam is the second partial beam, which is provided in the description of the invention consistently for the visible imaging of the license plate.
  • the directly penetrating, first partial beam has an intensity of about 85% of the beam entering the pupil.
  • the remainder of the radiation is essentially lost by the reflection at the first interface.
  • the division ratio can be arbitrarily influenced by targeted optical compensation of the interfaces.
  • the direction in which the second image is offset be determined by turning the retaining ring 7.
  • the third embodiment which is shown in Fig. 3 works.
  • the angular offset is equal to the mirror angle deflection ⁇ 2 variably adjustable by the angle ⁇ between the one Planplattencru 15 forming thin glass plates can be varied by an angular range ⁇ .
  • the set angle ⁇ can be read on the drum of the adjusting screw 16.
  • the possibility of changing the angular offset may prove useful in mobile stations, in order to be able to adjust the image offset of the image of the indicator of the imaged vehicle size at different recording distances (about 10 to 25 m).
  • the fourth embodiment is characterized in that it allows a structurally simple way to vary the intensity ratio, without changing the vertical image offset. Such a solution would be particularly advantageous for mobile devices that should be easily and quickly aligned to different lanes. As already explained, the incidence of the radiation reflected by the license plate is very dependent on the viewing angle at which the vehicle is imaged.
  • FIGS. 4a to 4c A fourth exemplary embodiment is shown in FIGS. 4a to 4c.
  • the retaining ring 7 is rotatably mounted to the outer ring 6 and thus to the recording device 4.
  • a self-aligning ball bearing 17 In the retaining ring 7 is radially aligned with the optical axis a self-aligning ball bearing 17.
  • FIG 5 a fifth, particularly suitable for mass production embodiment is shown. Compared with the embodiments shown so far, this fifth embodiment can be produced particularly cheaply by its simplest construction with the lowest means and assembly costs.
  • the objective 3 is reduced here to the outer ring 6 and the wedge 8 and is attached to the lens 1.
  • the wedge 8 extends over the entire pupil opening 9, whereby, in contrast to the previously considered embodiments with wedge 8, the entire imaging beam passes through the wedge 8.
  • the two partial beams are formed on the one hand by the refraction at the exit from the wedge 8 and by the two-fold reflection in the wedge 8. Both partial beams are deflected here by an angular offset to the optical axis.
  • the angle ⁇ is equal to the wedges 8 of the other embodiments, an angle to a perpendicular to the optical axis, ie, the entrance surface of the wedge 8 is perpendicular to the optical axis, while the exit surface is inclined relative to this perpendicular by the angle ⁇ .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Traffic Control Systems (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Cameras In General (AREA)

Claims (8)

  1. Procédé de prise de vue photographique d'un véhicule, dans lequel procédé un flash est dirigé sur ledit véhicule pendant la projection du véhicule sur un médium d'enregistrement (2), ledit procédé étant caractérisé en ce que
    le faisceau d'image qui est refléchi dudit véhicule et qui a pour effet ladite image est séparé en deux faisceaus de rayons partiels, le premier faisceau partiel qui présente une intensité lumineuse qui n'est qu'imperceptiblement inférieur à celle du faisceau d'image total engendrant une première image sur laquelle le conducteur du véhicule est bien reconnaissable, tandis que le deuxième faisceau partiel qui présente une intensité lumineuse de moins de 5% de celle du faisceau d'image total engendre une deuxième image sur laquelle la plaque d'immatriculation est bien reconnaissable, et en ce que les deux images géométriquement identiques sont engendrées et stockées sur le médium d'enregistrement (2) en même temps, mais de manière localement déplacée.
  2. Dispositif de prise de vue photographique d'un véhicule, ce dispositif comportant une caméra (4) composée d'un objectif (1), pour engendrer un
    faisceau d'image, et d'un médium d'enregistrement (2) au plan focal de l'objectif (1), ledit dispositif étant caractérisé en ce que,
    dans la marche des rayons du faisceau d'image, il y a des moyens pour partager le faisceau d'image en deux faisceaux partiels déplacés, l'un par rapport à l'autre, et présentant des intensités différentes, lesdits faisceaux ayant pour effet deux images géométriquement identiques sur ledit médium d'enregistrement (2) qui présentent des intensités différentes et qui sont localement déplacées l'une par rapport à l'autre; le premier faisceau partiel, qui présente une intensité lumineuse imperceptiblement inférieure à celle du faisceau d'image total, engendrant une première image, tandis que le deuxième faisceau partiel, qui présente une intensité lumineuse de moins de 5% de celle du faisceau d'image total, engendre une deuxième image, de sorte que ladite première image montre le conducteur du véhicule et la deuxième image montre la plaque d'immatriculation, d'une manière bien éclairée et reconnaissable.
  3. Dispositif selon la revendication 2, caractérisé en ce que
    lesdits moyens sont disposés en amont de l'objectif (1), comme vue dans la direction d'image, et font partie d'un adapteur d'objectif (3) dans la marche des rayons du faisceau d'image.
  4. Dispositif selon la revendication 2 ou 3, caractérisé en ce que
    lesdits moyens sont constitués d'une paire de lames planes (15) renfermant entre eux un angle (α) de telle manière que, par séparation physique du faisceau, la composante du rayonnement qui est guidée le long des faces des lames planes par réflexion constitue le premier faisceau partiel et la composante traversante du rayonnement constitue le deuxième faisceau partiel, et le premier faisceau partiel est dévié par rapport à l'axe optique avec un déplacement angulaire égale à la déviation de l'angle de réflexion σ2 = 2α.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce
    qu'un coin (8) présentant un indice de réfraction (n) et un angle (α) est utilisé comme lesdits moyens, ce coin (8) s'étendant dans la marche des rayons d'image et, au moyen d'une séparation géométrique du faisceau, dévie cette composante du rayonnement touchant la surface de coin (10) qui s'étend dans la marche des rayons d'image, ladite composante du rayonnement étant déviée en tant que deuxième faisceau partiel avec un déplacement angulaire égal à l'angle de déviation du coin σ1= α (n-1), et ledit coin (8) laissant cette composante du rayonnement, qui ne traverse pas la surface de coin (10), rester non-influencée en tant que premier faisceau partiel.
  6. Dispositif selon la revendication 5, caractérisé en ce que
    l'on peut faire entrer et sortir la surface de coin (10) dans la marche des rayons d'image, variant de cette manière la surface optiquement active de la surface de coin (10), ce qui a pour effet une variation de l'intensité surtout du deuxième faisceau partiel.
  7. Dispositif selon la revendication 3 ou 4, caractérisé en ce
    qu'un coin (8) présentant l'indice de réfraction (n) et un angle (α) est utilisé comme lesdits moyens, ce coin (8) déviant, par séparation physique du faisceau, le premier faisceau partiel avec un déplacement angulaire égal à l'angle de déviation du coin σ1= a (n-1) par rapport à l'axe optique, au moyen d'une diffraction, et déviant le deuxième faisceau partiel avec un déplacement angulaire égal à la déviation de l'angle de réflexion σ2= 2α par rapport à l'axe optique, au moyen d'une réflexion.
  8. Dispositif selon la revendication 2, caractérisé en ce
    qu'un filetage extérieur est présent de ce côté de l'adapteur pour objectif (3) qui est tourné vers l'objectif (1), par lequel filetage extérieur l'adapteur pour objectif (3) est relié à un filetage pour filtre d'objectif (5), ce filet étant présent à l'objectif (1), et en ce qu'un filetage intérieur qui est identique au filetage pour filtre d'objectif (5) est présent du côté détourné de l'objectif (1), ledit filetage intérieur permettant le montage additionnel d'un filtre.
EP03737906A 2002-05-23 2003-05-22 Procede et systeme de prise de photographies d'un vehicule Expired - Lifetime EP1509812B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10223923 2002-05-23
DE10223923A DE10223923B4 (de) 2002-05-23 2002-05-23 Verfahren und Anordnung zur fotografischen Aufnahme eines Fahrzeuges
PCT/DE2003/001704 WO2003100518A2 (fr) 2002-05-23 2003-05-22 Procede et systeme de prise de photographies d'un vehicule

Publications (2)

Publication Number Publication Date
EP1509812A2 EP1509812A2 (fr) 2005-03-02
EP1509812B1 true EP1509812B1 (fr) 2006-07-26

Family

ID=29557385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03737906A Expired - Lifetime EP1509812B1 (fr) 2002-05-23 2003-05-22 Procede et systeme de prise de photographies d'un vehicule

Country Status (8)

Country Link
EP (1) EP1509812B1 (fr)
AT (1) ATE334426T1 (fr)
AU (1) AU2003245840A1 (fr)
BR (1) BR0304936A (fr)
DE (2) DE10223923B4 (fr)
ES (1) ES2270053T3 (fr)
IL (1) IL165047A (fr)
WO (1) WO2003100518A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2867594B1 (fr) * 2003-12-10 2006-05-26 Sagem Procede et systeme d'identification d'un vehicule en deplacement
FR2863755B1 (fr) * 2003-12-10 2006-10-27 Sagem Procede et systeme d'identification d'un vehicule en deplacement
DE102006058057B3 (de) * 2006-12-07 2008-07-24 Sick Ag Verfahren und Vorrichtung zur optischen Erfassung einer Struktur
EP2157558B1 (fr) * 2008-08-19 2015-05-06 JENOPTIK Robot GmbH Procédé et dispositif pour photographier un véhicule
EP2178059A1 (fr) 2008-10-16 2010-04-21 ROBOT Visual Systems GmbH Dispositif destiné à la saisie d'infractions routières et au contrôle de plaques d'immatriculation
AU2009338673B2 (en) * 2009-01-28 2014-03-13 Jenoptik Robot Gmbh Method and system for conclusively capturing a violation of the speed limit on a section of a road
EP2449540A1 (fr) * 2009-06-30 2012-05-09 Siemens Aktiengesellschaft Procédé et dispositif de surveillance du trafic routier
FR2956747B1 (fr) * 2010-03-19 2012-08-03 Hugueny Alain Marie Filtre separateur, hautes et basses lumieres, par prisme(s) a faible deviation angulaire

Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH08265614A (ja) * 1995-03-20 1996-10-11 Olympus Optical Co Ltd 瞳分割式画像分割撮影装置

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US3794409A (en) * 1971-12-17 1974-02-26 Lockheed Aircraft Corp Method and apparatus forming plural focused images with a common lens system
JPS5767916A (en) * 1980-10-14 1982-04-24 Mitsubishi Electric Corp Photographing device of car
US4548495A (en) * 1981-02-27 1985-10-22 Takeomi Suzuki Proper focusing state detecting device
JPS60195533A (ja) * 1984-03-19 1985-10-04 Koito Ind Co Ltd ストロボフラツシユを用いて車両の前面を撮影する方法及びその装置
DE3535588A1 (de) * 1985-10-05 1987-04-09 Robot Foto Electr Kg Verfahren und vorrichtung zur photographischen erfassung stark leuchtender oder reflektierender teile eines zu photographierenden gesichtsfeldes
DE29718274U1 (de) * 1997-10-15 1998-03-19 Rugullis, Michel, 29614 Soltau Camerarecorder von Geschwindigkeitsmeßgeräten mit eingebautem Verlauffilter

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH08265614A (ja) * 1995-03-20 1996-10-11 Olympus Optical Co Ltd 瞳分割式画像分割撮影装置

Also Published As

Publication number Publication date
EP1509812A2 (fr) 2005-03-02
BR0304936A (pt) 2004-09-28
AU2003245840A1 (en) 2003-12-12
WO2003100518A2 (fr) 2003-12-04
ATE334426T1 (de) 2006-08-15
AU2003245840A8 (en) 2003-12-12
DE50304370D1 (de) 2006-09-07
DE10223923A1 (de) 2003-12-18
ES2270053T3 (es) 2007-04-01
WO2003100518A3 (fr) 2004-04-01
DE10223923B4 (de) 2004-07-22
IL165047A (en) 2009-09-01
IL165047A0 (en) 2005-12-18

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EP1019748B1 (fr) Dispositif de mesure optoelectronique

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