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
  • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
  • G08G1/054—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed photographing overspeeding vehicles
• • 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
  • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors

Definitions

• the invention relates to a method and an arrangement for checking compliance with a maximum speed given on a road section of a roadway, the identification and the time of passage of a vehicle in each case of a first end point (entry point) and a second end point (exit point) of the route section, and an average vehicle speed (average speed) of the vehicle is determined according to the route / time law by forming the quotient of the length of the route section and the difference of the times of the passage.
• Too fast driving costs not only many lives every year, but also a lot of money for the medical care of the injured. In addition, it causes immense damage to property and also prevents the free flow of traffic. Appropriate and effective speed monitoring is therefore particularly important.
• radar devices For detecting and monitoring the driving speed of vehicles radar devices are used, for example, based on the utilization of the Doppler effect. If the permissible maximum speed is exceeded, one or more images of the vehicle are taken for documentation purposes. Despite the effectiveness of this method, the monitoring takes place only at specific points, at fixed or mobile points, so that drivers who know these monitoring points briefly reduce their driving speed in order then to continue driving when the permissible maximum speed is exceeded.
• a signal to an output portal is given, which controls a display device to inform the driver that he with a excessive speed has driven.
• a method for a proof detection of a speed violation is suitable or provided, which includes an image recording in which the driver is recognizable. Since the license plate recognition is merely the identification of alphanumeric characters with a standardized typeface, cameras of low resolution can be used for this purpose, which not only makes these cameras comparatively cheaper, but also advantageously keeps the computation and storage costs optimally low.
• the necessary number of pixels for a camera for license plate recognition depends in particular on the scene width of the image capture. If the camera is used only for one lane, with an average lane width of 3.6 m, a 1.4 megapixel camera provides the minimum resolution that is necessary for a one centimeter line width with a good recognition rate to capture.
• Infrared-sensitive cameras are particularly well suited for license plate detection, since in the infrared range, the lighting can be performed in the non-visible area and reflect the vehicle registration here particularly well during both daytime and nighttime operation. As a result, sufficient contrast and brightness can be achieved in the image recordings with appropriate illumination.
• the intensity of the illumination is not sufficient to illuminate the passenger compartment.
• the invention has for its object to provide a method of the type mentioned above and an arrangement for carrying out the method which / which provides a documentary evidence.
• the object of the invention is for a method of evidence
• the image recordings are created in such a quality that they allow a license plate recognition, with this known method for optical character recognition (OCR).
• OCR optical character recognition
• the times at which the vehicle is detected (hereinafter referred to as detection times, detected and assigned to the image recording of each detected vehicle.
• the license plates of the vehicles are searched for and recognized by known methods for optical character recognition, and the image recordings of the same vehicle are assigned to one another.
• a high-resolution image of the driver with simultaneous flash lighting, triggered.
• the passenger compartment is illuminated in such a way that the driver under all possible conditions (different speeds, different times of day, different designs of the windshield, etc.) can be identified in the image recording. All the information necessary for suspending the traffic violation, such as the average speed determined, the maximum speed permitted, the vehicle registration numbers recorded at the entry point and at the exit point as well as location and time data are displayed in the image recording.
• the flash is triggered specifically only when speeding. This disturbs the rest of the traffic as little as possible.
• the high-resolution image recording of the vehicle is triggered when the vehicle is located at a lying in the direction of travel behind the exit point, predetermined photo point and thus in a defined depth of field of the camera.
• the quality of the image recording, in combination with the targeted flashing light and thus the recognizability of the driver can be significantly improved.
• the predetermined photo point is at a sufficient distance behind the exit point to ensure that even at high speeds (eg> 250 km / h), the time it takes the vehicle from the exit point to the photo point is greater than the maximum time required for the transmission of the acquired data, the recognition of the vehicle registration mark by means of OCR, the examination of whether there is a speed violation, and the calculation of the time it takes the vehicle from the exit point to the photo point.
• high speeds eg> 250 km / h
• the instantaneous speed of a vehicle is detected when passing the exit point and the high-resolution image acquisition is triggered at a photo time.
• the photo time is previously calculated according to the distance / time law, from the detected instantaneous speed, which can additionally serve as a second proof, and the distance between the exit point and a given photo point.
• the instantaneous speed of a vehicle when passing the entry point is detected in addition, which can justify an initial suspicion or serve as a second proof, including the instantaneous speed in the image recording is displayed.
• the two detection times are advantageously detected in each case by two independent timer units and two differences are formed, with which two times are calculated, of which the longer is used for the determination of the average speed.
• the two detection times are respectively detected by different timer units and a radio-controlled timer unit and the different timer units are synchronized with the radio-controlled timer unit when the deviation of the time information exceeds a predetermined value.
• the object of the invention is achieved with a first detection unit, connected to a first timer unit, and a second detection unit, connected to a second Timer unit, wherein the first detection unit at an entry point of the track section and the second detection unit at an exit point of the track section, are aligned with the road surface, arranged.
• first detection unit and the one second detection unit which are each designed to detect vehicles, irrespective of which lane they are traveling on, an equal number of first detection units and second detection units, such as lanes and, if applicable, of Interest, hard strips are available, be arranged.
• Each detection unit is associated with a camera, i. H. a first camera whose
• Object field detects the entry point is connected to the first detection unit and an existing first license plate recognition unit and a second camera whose object field detects the exit point is connected to the second detection unit and an existing second license plate recognition unit.
• the said units are directly or indirectly connected to a computing and storage unit which is adapted to compare the recognized vehicle registration numbers for agreement with one another and, if appropriate, the detected, associated detection times and the known length of the route section, the average speed of the vehicle and compares them with a predetermined maximum speed to give a signal when they are exceeded.
• At least one further with the computing and storage unit in connection, directed to the road camera and a flashlight connected to it are present to a high-resolution image of the Driver, with simultaneous illumination, in the event of a signal release to be able to trigger.
• a further camera whose object field covers the entire width of the road may be sufficient, or a plurality of further cameras are arranged so that their object fields together cover the roadway width. Usually, you will then order the other cameras so that they are each assigned to a lane.
• a radio-controlled third timer unit is present, which is in communication with the first and the second timer unit.
• the further camera is directed onto the roadway that their object field detects a predetermined in the direction of travel behind the exit point photo point.
• a connected to the other camera and the computing and storage unit speed sensor is present, which detects the instantaneous speed of the vehicle at the exit point, and the computing and storage unit is designed so that it from the instantaneous speed and the known distance of a given photo point to the exit point can determine the time after which the vehicle should have arrived at the photo point in order to trigger the other camera after this time can.
• the speed sensor is the second detection unit.
• the second detection unit is not only designed to detect the vehicle as such, but also to detect its instantaneous speed, which is e.g. B. a radar sensor or a horizontally mounted laser scanner can.
• a radar sensor and also the laser scanner can advantageously also detect the detection location, whereby the vehicle can be assigned to a lane of the lane and the further camera is triggered, which is assigned to the relevant lane.
• the first and the second detection unit are laser scanners, which are mounted above the road, so that their scan plane is perpendicular to the road surface, whereby the vehicle first detected and second, the classification, whose top view are detected can.
• the detection units are advantageously laser scanners that are positioned next to the roadway so that the scan plane of the first laser scanner is vertically aligned and the scan plane of the second laser scanner horizontally, whereby the first laser scanner detect the vehicle a first time and, to the classification whose side profile can capture, and the second serscanner can detect the vehicle a second time and capture the instantaneous speed.
• the stretch is equipped with a variable message system, which is in communication with the computing and storage unit, whereby the maximum speed to be compared corresponds to the speed currently displayed by the variable message system.
• 1a is a schematic diagram of a plan view of an embodiment of an inventive arrangement
• FIG. 1b is a schematic diagram of a side view of an embodiment of an arrangement according to the invention.
• Fig. Ia shows a plan view of a roadway with two lanes and a
• the vehicles are detected at the entrance and the exit in and from a section.
• the device consists of detection units which are either designed to detect vehicles traveling on only one lane, or which can detect all vehicles, irrespective of which lane they are traveling on.
• the detection units are each designed for the width of a traffic lane and arranged and aligned to the roadway so that they can detect a vehicle at the entry point E and at the exit point A respectively.
• the first and second detection unit 1.1, 2.1 respectively by a mounted above the road, directed perpendicular to the road laser scanner 1.1.1, 2.1.1 and obliquely directed to the roadway Laser scanner 1.1.2, 2.1.2 formed.
• the laser scanner line which is described on the roadway by the vertically directed laser scanner 1.1.1 of the first detection unit 1.1, defines the entry point E. Accordingly, the laser scanner line defined by the vertically directed laser scanner 2.1.1. the second detection unit 2.1 is described on the roadway, the exit point A.
• each one laser scanner 1.1.2, 2.1.2 which is directed obliquely on the roadway, thereby providing a determination of the vehicle profile in a manner known to those skilled in the art is made possible and on the other hand, the instantaneous speed of the vehicle can be detected.
• the arrangement necessarily comprises a first timer unit 1.2, a first license plate recognition unit 1.3 and a first low-resolution camera 1.4, which are in communication with the first detection unit 1.1, and a second timer unit 2.2, a second license plate recognition unit 2.3 , and a second low-resolution camera 2.4, which communicate with the second detection unit 2.1.
• the cameras 1.4, 2.4 are each driven by the detection of a vehicle and create an image acquisition, from which the vehicle registration number is found and identified by the license plate recognition units 1.3, 2.3 in a manner known to those skilled in the art.
• the images are each assigned a time detected by the timer units 1.2, 2.2.
• a computing and storage unit 4 which is connected at least to the license plate recognition units 1.3, 2.3 and the timer units 1.2, 2.2, the recognized vehicle license plates are compared for compliance and the images are assigned to each other in which the same license plates were found , The time difference is formed from the assigned detection times, and the average speed is calculated by knowing the length of the route section. Subsequently, in the computing and storage unit 4, the average speed is compared with a maximum permissible speed and in the event that this has been exceeded by a predetermined amount, another camera 5 and a flash 6 are triggered.
• two more cameras 5, each with an associated flash 6 are present, one of which is directed to a lane.
• the further cameras 5 are arranged far enough away from the exit point A that there is sufficient time to associate the recognized vehicle registration numbers with one another, to calculate the average speed and to compare this with the permissible maximum speed before the detected vehicle enters the object field of one of the other Cameras 5 retracts.
• the time of triggering of one of the further cameras 5 is determined from the instantaneous speed determined at the exit point A and the knowledge of the distance of the further cameras 5 from the exit point A.
• a further camera 5 per lane advantageously only a single further camera 5 may be present whose object field detects the roadway over its entire width. From the image recording, only the image area which comprises the detected vehicle and its immediate surroundings is then zoomed out and stored. With a high-resolution camera, as available today, this still gives a sufficiently high-resolution image that allows to recognize the driver's face.
• the first and second cameras 1.4, 2.4 are infrared-sensitive cameras.
• cameras with a receiver matrix of z. B. 1.4 megapixels used.
• the images can be taken in daylight as well as at night with a low intensity flash.
• an infrared flash is used, which is not visible.
• the instantaneous speed at the entry and / or exit point E, A can be superimposed in the image recording, depending on national legislation at the entry and / or exit point E, A additionally to punish a violation of the instantaneous speed, as a second proof to serve or justify an initial suspicion.
• detection unit 1.1 instead of the laser selected in the first embodiment as the detection unit 1.1, 2.1 and their arrangement above the roadway, other than detection unit 1.1, 2.1 acting sensors, in the broadest sense, can be used.
• For mobile arrangements, for. B. can be used in addition to the roadway established radar sensors or laser scanners.
• induction loop or piezo sensors can be inserted into the road surface.
• the calculated average speed can also be compared with vehicle-specific permissible maximum speeds.
• the computing and control unit 4 may compare the calculated average speed with either maximum permissible speeds entered manually or with maximum permissible speeds obtained from a linked traffic signage facility 7, e.g. B. indicates different permissible maximum speeds depending on the traffic density or the visibility.
• the deviation of the synchronism of the first and second timer unit 1.2, 2.2 must not exceed a predetermined tolerance.
• a radio-controlled third timer unit 3 which communicates with the first and the second timer unit 1.2, 2.2. At regular intervals, the deviation of the time specified by the first and second timer unit 1.2, 2.2 compared with the time of the radio-controlled third timer unit 3 and when exceeding a predetermined tolerance deviation, the first or second timer unit 1.2, 2.2 adjusted and thus to the time of radio-controlled third timer unit 3 adjusted.
• the radio-controlled third timer unit 3 can also be in connection with the first and second detection unit 1.1, 2.1 and detect the detection times, whereby there are two detection times when passing the entry point E and when passing the exit point A for the vehicles passing through the section gives what provides a double security. To determine the average speed then the larger time difference is used.
• the time values obtained in each case then also include both time values obtained in the image recording as entry times and exit times.

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• General Physics & Mathematics (AREA)
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• 2009
  • 2009-11-16 CN CN2009801556835A patent/CN102301404A/zh active Pending
  • 2009-11-16 US US13/146,716 patent/US8639435B2/en active Active
  • 2009-11-16 AU AU2009338673A patent/AU2009338673B2/en not_active Ceased
  • 2009-11-16 EP EP09805679A patent/EP2391995A1/de not_active Withdrawn
  • 2009-11-16 WO PCT/DE2009/050062 patent/WO2010085931A1/de active Application Filing
  • 2009-11-16 DE DE112009003923T patent/DE112009003923A5/de not_active Withdrawn

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