EP0236387B1 - Dispositif de surveillance photographique de carrefours - Google Patents

Dispositif de surveillance photographique de carrefours Download PDF

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Publication number
EP0236387B1
EP0236387B1 EP86905259A EP86905259A EP0236387B1 EP 0236387 B1 EP0236387 B1 EP 0236387B1 EP 86905259 A EP86905259 A EP 86905259A EP 86905259 A EP86905259 A EP 86905259A EP 0236387 B1 EP0236387 B1 EP 0236387B1
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EP
European Patent Office
Prior art keywords
sensor
signal
vehicle
releasing
intersection
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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
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EP86905259A
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German (de)
English (en)
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EP0236387A1 (fr
Inventor
Heinrich Horsch
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 Foto and Electronic GmbH and Co KG
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Robot Foto and Electronic GmbH and Co KG
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Publication of EP0236387A1 publication Critical patent/EP0236387A1/fr
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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

Definitions

  • a sensor is attached to the traffic light in the area of the traffic light, which provides a sensor signal when a vehicle passes over it. If such a signal appears in the blocking phase of the traffic light, ie if a vehicle enters the intersection in the blocking phase contrary to traffic, a photographic camera is triggered, the field of view of which detects the traffic light-controlled crossing. As a result, the behavior contrary to traffic and also the motor vehicle registration number of the vehicle in question is recorded photographically (DE-A-683 658).
  • the sensor signal it is also known to use the sensor signal to successively trigger several photographic recordings at adjustable time intervals if a sensor arrangement detects a vehicle's behavior contrary to traffic.
  • This behavior contrary to traffic may consist of the vehicle entering an intersection during the blocking phase.
  • the photographic camera is triggered by a signal when a contact threshold laid in the road is passed.
  • the traffic violation behavior can also consist in the vehicle driving too fast.
  • the photographic camera is triggered in that two contact thresholds laid one behind the other in the carriageway are passed within a predetermined period corresponding to the permissible maximum speed (DE-A-10 78 797 or AT-A-225 077).
  • the two contact thresholds laid one behind the other in the direction of travel are used exclusively for speed measurement.
  • Fr-A-22 01 510 discloses a hydraulic sensor that can be operated by a vehicle and that can also be used for traffic monitoring.
  • two such sensors are arranged one behind the other in the direction of travel of the vehicle to be monitored. This is to ensure that a stop sign is observed.
  • Both sensors are arranged in front of the intersection, one at a distance from the intersection and the other on the stop line.
  • the first sensor activates the second.
  • the second sensor triggers a recording of the vehicle if it is run over within a predetermined time.
  • this arrangement corresponds to the speed measurement according to AT-A-225 077.
  • DE-C-2 356 331 discloses a device for photographically monitoring traffic light-controlled intersections with a photographic camera which detects the intersection and a sensor which responds to the entry of a vehicle into the intersection and delivers a sensor signal by means of a detector circuit.
  • a camera release device can be controlled by a first release signal triggered by the sensor signal via a first gate circuit to trigger a first picture.
  • the first gate circuit can be switched through by a signal from the traffic light during its blocking phase.
  • a timer is triggered which switches for a predetermined delay time. After the delay time has elapsed, the timing element generates a second trigger element, which acts on the camera trigger device, for triggering a recording.
  • the first gate circuit is blocked from the triggering of the first shot until the end of the second shot.
  • a second vehicle entering the intersection shortly after the first triggering vehicle cannot immediately produce a trigger signal before the cycle consisting of the first and second recording, initiated by the first vehicle, has ended.
  • the sensor signal is present at the same time on a second gate circuit which is switched through during the blocking time of the first gate circuit.
  • the output of this second gate circuit is also connected to the camera release device via a signal-delaying timer with a delay time that is longer than the time required for the two recordings.
  • the sensor pulse of the second vehicle is thus stored, so to speak, until the first two recordings, including film transport, have definitely ended.
  • a third picture is taken.
  • the second vehicle is then certainly visible on one of the two images triggered by the first vehicle and additionally on the third image, so that two images are also taken of the second vehicle.
  • US-A-3 858 223 and DE-B-2 307 217 also show a device for photographic monitoring of traffic light-controlled intersections, in which a vehicle triggers two shots in succession when entering the intersection.
  • a second sensor is provided in a roadway crossed to the roadway to be monitored, by means of which the camera triggering device can be controlled via a gate circuit which is switched through during the delay time between the first and second recording.
  • fast-moving vehicles are detected which enter the intersection during the blocking phase and immediately turn into a carriageway crossed to the blocked carriageway before the delay time of the timer expires and the second recording is triggered.
  • additional recording is triggered via the second sensor before the specified delay time has expired. This recording then captures the turning vehicle.
  • two sensors lie in mutually crossed lanes.
  • the use of the second sensor has the special purpose of detecting turning vehicles. Vehicles driving straight ahead do not respond to the second sensor and are detected by the recording triggered after a predetermined delay time.
  • the known devices can also fail in slow-moving vehicles. If the vehicle has triggered the sensor in slow driving and the delay time has started to run, then it may happen that at the time of the second picture this vehicle is not yet in the danger zone. The vehicle can then continue to cross the intersection during the blocking phase without this being proven to him on the basis of the recordings.
  • the distance of the photographed vehicle from the camera depends on the speed of the vehicle. This is particularly disadvantageous in frontal photography, where there is It is important to identify a person behind the windshield in the picture if the lighting conditions are often unfavorable.
  • the invention has for its object to provide a device of the type mentioned so that both vehicles that drive very quickly during the blocking phase over the intersection and very slowly during the blocking phase vehicles crossing the intersection can be photographically verified in the danger zone.
  • the second sensor responds to the passage of the vehicle by a second position lying in a straight line behind the first position in the danger area of the intersection and by means of which a second sensor signal can be connected to the signal processing means.
  • the recording conditions can be optimized.
  • the camera can be focused on the associated distance.
  • the fast and the slow driver are photographed within the danger zone where the second sensor is located. Both can therefore be proven to be traffic violent in evidence.
  • the camera in the device according to the invention is also controlled as a function of a blocking phase signal, which is picked up by a traffic light system becomes.
  • a camera is triggered when the first and the second sensor respond, while in DE-A-1 078 797 the camera is only triggered after both sensors have responded within a predetermined period of time and thus signal an excessive speed.
  • FR-A-72 33 701 mentioned above.
  • the second sensor responds to the passage of the vehicle through a position lying in a straight line behind the first sensor.
  • the second sensor is therefore not in a lane crossed to the monitored lane.
  • the object of the second sensor of the invention is the detection of very slow and very fast moving vehicles, not as in DE-B-2 307 217 and US-A-3 858 223 the detection of turns.
  • Embodiments of the invention are the subject of the dependent claims.
  • 10 denotes an intersection in which two roads 12 and 14 intersect.
  • the intersection 10 is controlled by a traffic light system, of which only one traffic light 16 is shown in front of the intersection in the street 12.
  • a pedestrian crossing 18 is marked in the area of traffic light 16.
  • a road marking 20 for two lanes with a stop line is applied on the road 12 in front of the pedestrian crossing 18.
  • a first sensor in the form of an induction loop or the like 22 is inserted in the direction of travel behind the marking on the entrance side of the pedestrian crossing 18 and behind the street marking 20 in the pavement.
  • a second sensor 24 embedded in the road surface is arranged in the danger area of the intersection 10 in a straight line behind the first sensor 22.
  • a photographic camera With 26 a photographic camera is designated, the signal processing means of sensor signals of the sensors 22 and 24 and a blocking phase signal the traffic light system 16 is controlled. If a vehicle passes the induction loop 22 during the blocking phase when a blocking phase signal is generated, the camera 26 is triggered to take a first picture. A second recording is triggered when the vehicle travels via the second induction loop 24, that is to say is located in the danger area of the intersection 10. However, this triggering of the second recording takes place only if the first recording was triggered beforehand by passing over the induction loop 22. This prevents the camera from being triggered by cross traffic in street 14. The second sensor 24 is therefore only activated by the first sensor signal of the first sensor.
  • FIG. 1 A second alternative is indicated in FIG. 1.
  • a photographic camera 28 set up for frontal photography of the vehicle can also be arranged such that it photographs the vehicle from the front against the direction of travel.
  • a vehicle 30 travels at a very high speed over the intersection 10 during the blocking phase and, according to the prior art, the first and the second recording are triggered one after the other at a fixed time interval, then the vehicle 30 can already be so far away from the camera 26 that a correct identification of the vehicle on the second picture is no longer possible. In the position shown, the vehicle has already moved out of the field of view of the camera 28, so that in the case of a frontal photograph with the second picture at all would no longer be recorded. Likewise, a vehicle 32 entering the intersection 10 very slowly, as indicated in FIG. 1, could indeed respond to the first sensor 22, but could not yet get into the ordinary danger zone of the road 14 during the predetermined delay time.
  • the vehicle 32 would then be photographed once in the area of the sensor 22 and on the other hand in the area of the street corner but outside the actual danger area of the street 14. The vehicle 32 could then continue to cross the intersection 10 during the blocking phase. without being able to prove this to him.
  • both the carriage 30 and the carriage 32 would be photographed in essentially the same position in the danger area of the intersection 10 and at an optimal distance from the camera 26 or 28 .
  • Fig. 2 shows the associated signal processing means.
  • the first sensor which contains a detector circuit (not shown), is connected to an input 34.
  • An optocoupler is provided between the input 34 and the signal processing means. This optocoupler causes an inversion of the signal: a positive pulse is converted into a negative pulse. The optocoupler is therefore symbolized by an inverter 36.
  • the inverted sensor signal is converted into a perfectly processable rectangular pulse by a pulse shaper 38. This is known technology (see US-A-358 223) and is therefore not described in detail here.
  • the sensor signal thus obtained is present at an input 40 of a flip-flop 42.
  • the flip-flop 42 is usually made up of two NAND gates 44 and 46.
  • the output of the NAND gate 44 is connected to an input 48 of the NAND gate 46.
  • the output of the NAND gate 46 is connected to an input 50 of the NAND gate 44.
  • the input 40 forms a further input of the NAND gate 44.
  • the NAND gate 46 has a second input 52, via which the flip-flop 42 can be reset in a manner to be described.
  • the NAND gate 46 has a third input 54, which is connected to an input 56 for a blocking phase signal.
  • the signal present at the input 50 of the NAND gate 44 is connected to a reset input 56 of a counter 58.
  • the counter 58 is designed in a known manner as an electronic preselection counter which emits an output signal at an output 60 at a predetermined counter reading. This signal is connected via a resistor 62 and an inverter 64 to the second input 52 of the NAND element 46 in the flip-flop 42.
  • the output signal of the NAND gate 46 which is present at the input 50, is also connected to an input 66 of a NOR gate 68.
  • the second sensor 24 which contains a detector circuit (not shown), is connected to an input 70.
  • the second sensor signal is connected to the second input 76 of the NOR gate 68 via an optocoupler (shown as inverter 72) and a pulse shaper 74 switched.
  • the output of the NOR gate 68 is at an input 78 of a NOR gate 80.
  • the signal present at the input 50 of the NAND gate 44 is also connected to an input 82 of an exclusive OR gate 84.
  • the same signal is connected to an RC element, consisting of a resistor 86 and a capacitor 88, at the second input 90 of the exclusive-OR element 84.
  • the output of the exclusive-OR element 84 is at the second input 92 of the NOR- Section 80.
  • the output of NOR section 80 controls a circuit 94 for generating a trigger signal for the camera.
  • the output of the NOR gate 68 is also connected to the input of the inverter 64 via a line 96 and a diode 98.
  • the counter 58 contains two counting stages 100 and 102 for counting seconds and tenths of a second.
  • the counter stage 100 receives an input signal with twice the mains frequency of 100 Hz.
  • the counter reading is compared with predetermined numbers in digital comparators 108 and 110 via diode arrangements 104 and 106. When a preselected number is reached, an output signal is generated at output 60. In this way, delay times of 0.5 to 9.9 seconds can be set on the counter.
  • the output of the NAND gate 46 is in the "H” state, and this signal is also present at the input 50 of the NAND gate 44. Since both inputs 40 and 50 of the NAND gate 44 are in the "H” state, the output of the NAND gate 44 and thus the input 48 of the NAND gate 46 are in the "L” state. This is a stable state of the flop flop 42.
  • the output of the NAND gate 46 therefore goes into the "L” state. It can be seen that this is a second stable state of the flip-flop 42. Since the output of the NAND gate 46 is connected to the reset input 57 of the counter 58, the counter 58 begins to count since the signal "H" at the reset input 57 changes to a signal "L".
  • the circuit 94 is driven via the exclusive OR gate 84 and the NOR gate 80, so that it emits a trigger signal.
  • the output of the exclusive OR gate 84 is normally zero, because in the static state with the capacitor 88 charged, both inputs 82 and 90 of the exclusive OR gate 84 are at the same potential. They are both connected to the output of the NAND gate 46, but an RC gate 86, 88 is connected upstream of the input 90.
  • the output of the NAND gate 46 changes from the "H” state to the "L” state, they are temporary inputs 82 and 90 at different potential.
  • the input 82 immediately goes into the "L” state, while the input 90 remains in the "H” state for a while because of the charged capacitor 88.
  • the exclusive OR gate 84 therefore outputs an output pulse when the flip-flop 42 is switched.
  • a second sensor signal appears in the form of a positive pulse at the input 70.
  • This positive pulse is converted into a negative pulse by the inverter 72.
  • the input 76 of the NOR gate 68 therefore temporarily goes into the "L” state. If the first sensor 22 has responded beforehand, then, as described, the output of the NAND gate 46 is also in the “L” state. This “L” signal is also present at the second input of the NOR gate 68. If the input 76 also goes into the "L” state, the output of the NOR gate 68 goes into the "H” status. A second pulse is thus applied to the circuit 94 via the NOR gate 80, so that a second trigger signal is generated to trigger a second shot of the camera.
  • the input 52 of the NAND element 46 is temporarily brought into the "L” state via the line 96, the diode 98 and the inverter 64.
  • the flip-flop 42 therefore switches back to its initial state.
  • the output of the NAND gate 46 goes into the "H” state. This causes the output of the NAND gate 44 to be in the "L 'state.
  • the output of the NAND gate 46 therefore remains” H “even after the pulse at the output of the NOR gate 68 has ended, when the input 52 returns to the" H "returns.
  • the counter 58 is reset to zero via the reset input 57.
  • the signal processing circuit is in its initial state when the second sensor signal appears, that is to say the output of the NAND gate 46 is in the "H” state ".
  • the output of the NOR gate 68 is therefore in the "L” state. This is independent of the state in which the input 76 of the NOR element 68 is.
  • the state of the output of the NOR gate 68 namely "L” is not affected.
  • a response of the second sensor 24 without first addressing the first sensor therefore does not trigger the camera 26 or 28.
  • the second recording is triggered as soon as the vehicle runs over sensor 24.
  • the vehicle 32 remains in the position shown in FIG. 1 after actuation of the sensor 22, that is to say still outside the danger zone of the intersection 10, then the following occurs: the second sensor signal does not appear.
  • the flip-flop 42 is not reset in the manner described via line 96, diode 98 and inverter 64 and the counter 58 is reset to zero.
  • the counter 58 therefore continues to count until the preselected counter reading, which corresponds to a specific delay time, is reached. Then the input 52 of the flip-flop 42 is brought into the "L" state via the output 60, the resistor 62 and again the inverter 64.
  • the vehicle 32 is photographed again in its position in front of the second sensor. It can therefore be demonstrated that the vehicle 32 has not entered the danger area of the intersection 10 but has stopped behind the stop line but still in front of the street corner.
  • a camera 26 in the direction of travel in front of the intersection, which photographs the vehicles from behind, or a camera 28 in the direction of travel behind the Intersection may be provided for frontal photography.
  • the camera 28 can optionally be controlled so that it is only triggered by the second sensor signal.
  • a microprocessor programmed with suitable software can also be used as the signal processing means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

Pour la surveillance photographique des carrefours un appareil photographique (26 ou 28) est prévu qui couvre un croisement (10). Un premier capteur (2) réagit lorsqu'un véhicule (30 ou 32) traverse une ligne de stop pendant la phase de stop des feux de circulation (16), ce qui provoque une première prise de photo par l'appareil (26) ou (28). Un deuxième capteur (24) est situé directement après le premier capteur (22) dans la région dangereuse du croisement (10) et dans une position optimale pour la prise de vue par l'appareil (26) ou (28) et déclenche une deuxième prise de vue lors de son passage. Par conséquent, le véhicule (30 ou 32) est photographié quelle que soit sa vitesse et toujours dans une position photographique optimale.

Claims (5)

1. Dispositif destiné à la surveillance photographique d'un carrefour (10) commandé au moyen d'une installation de feu de circulation (16), comprenant:
a) une caméra (26; 28) asservissant le carrefour (10),
b) un premier détecteur (22) répondant à l'entrée d'un véhicule (30, 32) dans le carrefour (10) au delà d'une première position, et fournissant un signal de détecteur,
c) des moyens destinés à engendrer un signal de phase d'arrêt en fonction du renversement de l'installation de feu de circulation (16) à la phase d'arrêt,
d) un dispositif de déclenchement de caméra commandable par des signaux de déclenchement destinés au déclenchement de photos de la caméra photographique (26; 28),
e) des moyens de traitement de signal auxquels sont appliqués le signal de détecteur et le signal de phase d'arrêt, et par lesquels, en cas de l'apparition d'un signal de détecteur lors de la durée du signal de phase d'arrêt, un premier signal de déclenchement destiné à déclencher une première photo de la caméra (26; 28) peut être engendré,
f) et un second détecteur par lequel un second signal de détecteur est applicable aux moyens de traitement de signal afin d'engendrer un second signal de déclenchement avec retard par rapport au premier signal de déclenchement afin de déclencher une seconde photo,
caractérisé par le fait que
g) le second détecteur (24) répond au passage du véhicule (30, 32) par une seconde position située dans la direction tout droit derrière la première position dans la zone dangereuse du carrefour.
2. Dispositif selon la revendication 1, caractérisé par le fait que la caméra photographique (28) est adaptée et disposée pour la photographie frontale du véhicule (30; 32).
3. Dispositif selon la revendication 1 ou 2, caractérisé par le fait que le second détecteur (24) n'est activable que par le premier signal de détecteur du premier détecteur (22).
4. Dispositif selon la revendication 3, caractérisé par le fait que les moyens de traitement de signal peuvent engendrer un signal de déclenchement destiné à déclencher une seconde photo après un temps de retardement prédéterminé en cas de réponse du détecteur (22) lors de la durée du signal de phase d'arrêt, lorsque le second détecteur (24) ne répond pas dans le délai de retardement prédéterminé.
5. Dispositif selon la revendication 1, caractérisé par
(a) une installation chronomètre destinée à mesurer l'écart temporel entre l'apparition du premier et du second signal de détecteur,
(b) des moyens destinés à former une valeur de mesure de la vitesse à partir dudit écart temporel et l'écart spacieux connu de la première et de la seconde position, et
(c) un dispositif indicateur également saisi par la photo et destiné à l'indication de cette valeur de mesure de la vitesse.
EP86905259A 1985-09-12 1986-08-07 Dispositif de surveillance photographique de carrefours Expired - Lifetime EP0236387B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853532527 DE3532527A1 (de) 1985-09-12 1985-09-12 Vorrichtung zur photographischen ueberwachung von kreuzungen
DE3532527 1985-09-12

Publications (2)

Publication Number Publication Date
EP0236387A1 EP0236387A1 (fr) 1987-09-16
EP0236387B1 true EP0236387B1 (fr) 1991-05-15

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EP86905259A Expired - Lifetime EP0236387B1 (fr) 1985-09-12 1986-08-07 Dispositif de surveillance photographique de carrefours

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Country Link
US (1) US4884072A (fr)
EP (1) EP0236387B1 (fr)
JP (1) JPS63501177A (fr)
DD (1) DD249561A5 (fr)
DE (2) DE3532527A1 (fr)
WO (1) WO1987001847A1 (fr)

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DE2257818C3 (de) * 1972-11-25 1975-08-28 Robot, Foto Und Electronic Gmbh & Co Kg, 4000 Duesseldorf Vorrichtung zur Verkehrsüberwachung
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FR2201510B3 (fr) * 1972-09-22 1975-10-17 Sertitch Robert
AT318389B (de) * 1972-11-13 1974-10-10 Eumig Pankratisches Objektiv
DE2307217C3 (de) * 1973-02-14 1975-07-31 Robot, Foto Und Electronic Gmbh & Co Kg, 4000 Duesseldorf Vorrichtung zur photographischen Überwachung von ampelgesteuerten Kreuzungen
US3858223A (en) * 1973-02-14 1974-12-31 Robot Foto Electr Kg Device for photographic monitoring of road intersections controlled by a traffic light
DE2356909A1 (de) * 1973-11-14 1975-05-15 Agfa Gevaert Ag Vorrichtung zur fotografischen verkehrsueberwachung
DE2802448C2 (de) * 1978-01-20 1982-03-18 Dieter 8000 München Schwenk Verfahren und Vorrichtung zur Herstellung von photographischen Aufnahmen von Fahrzeuginsassen
DE3327706A1 (de) * 1983-08-01 1985-02-21 Egbert Dipl.-Ing. 7500 Karlsruhe Rapp Verfahren und einrichtungen zur automatischen ermittlung der geschwindigkeit und identitaet von dicht folgenden fahrzeugen

Also Published As

Publication number Publication date
EP0236387A1 (fr) 1987-09-16
US4884072A (en) 1989-11-28
DD249561A5 (de) 1987-09-09
DE3532527C2 (fr) 1988-11-10
WO1987001847A1 (fr) 1987-03-26
DE3532527A1 (de) 1987-03-19
JPS63501177A (ja) 1988-04-28
DE3679310D1 (de) 1991-06-20

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