EP1374175A2 - Procede et systeme pour determiner une modification intervenue dans un objet de reference - Google Patents

Procede et systeme pour determiner une modification intervenue dans un objet de reference

Info

Publication number
EP1374175A2
EP1374175A2 EP01971680A EP01971680A EP1374175A2 EP 1374175 A2 EP1374175 A2 EP 1374175A2 EP 01971680 A EP01971680 A EP 01971680A EP 01971680 A EP01971680 A EP 01971680A EP 1374175 A2 EP1374175 A2 EP 1374175A2
Authority
EP
European Patent Office
Prior art keywords
image
reference object
determined
route
change
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.)
Withdrawn
Application number
EP01971680A
Other languages
German (de)
English (en)
Inventor
Christian Hoffmann
Günter DOEMENS
Franz Hepp
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP1374175A2 publication Critical patent/EP1374175A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
    • G06T7/254—Analysis of motion involving subtraction of images
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/12—Trolley lines; Accessories therefor
    • B60M1/28—Manufacturing or repairing trolley lines

Definitions

  • the invention relates to the determination of a change in a reference object.
  • This method of image processing a method for coding and decoding a digital image according to an image coding standard MPEG4 [9], is based on a principle of object-based image coding.
  • object-based image coding segmentation of two successive images into image blocks or image areas corresponding to objects occurring in a scene is carried out and these objects are encoded separately.
  • an image of an object is determined in a so-called inter-image coding with motion estimation in a temporally previous image. Then a further image of the object is also determined in the image that follows in time.
  • a difference image information is determined using image information associated with the image of the object in the temporally preceding image and the image information associated with the further image of the object in the temporally subsequent image. This difference image information is subsequently encoded and transmitted.
  • the difference image information is only very small if a change in the object in the temporally successive digital images, for example due to a movement or a change in shape of the object, is small. If the change is large, there is a lot of difference information. Out For this reason, as is known from [1], an “image-to-image * movement (motion estimation) is measured and compensated for before the difference information is determined (motion compensation).
  • FIG. 2 and FIG. 5 a structure of an overhead line for the power supply comprising the contact wire 201, the longitudinal chain train 202 and the transverse support device 203 is shown schematically.
  • FIGS. 2 and 5 also show two insulators, a hanger 206, a support rope twist clamp 503, a tip anchor 504, a cantilever tube 505, a diagonal tube 506.
  • a triangulation method [3] and time-of-flight-based phase measurement methods [4] are used to determine the vertical and lateral position of the contact wire.
  • a width of a grinding surface is measured with the aid of a laser scanner [5] or diode rows [2] or a residual height of the contact wire is determined in horizontally oriented transmitted light [6].
  • a measuring device used for this purpose and known from [6] is located above a grinder, which limits the vehicle speed for mechanical reasons, leads to shading in the overlap area of several contact wires and thus possibly simulates a larger residual height than actually present. To prevent this, such an area is excluded from a measurement.
  • a non-contact, recording-based monitoring method with an almost vertical viewing direction of an acquisition unit also has the disadvantage that only the width of a mirror surface can be detected. In principle, however, the mirror surface does not allow the residual height to be determined for a contact wire with an almost rectangular profile.
  • the invention is therefore based on the problem of specifying a method and an arrangement with which automatic and on a change in an object in a route is ascertained in a simple manner and the route can thus be monitored in a simpler and more cost-effective manner and with greater reliability than in the methods mentioned above.
  • At least one reference image is recorded at the predetermined location of the route
  • an image of the reference object is determined in the at least one reference image, at least one test image is recorded at the specified location of the route at a second point in time,
  • a further image of the reference object is determined in the at least one test image
  • the change in the reference object is determined by comparing the image of the reference object in the at least one reference image with the further image of the reference object in the at least one test image.
  • the arrangement for determining a change in a reference object which is associated with a route and which is present at a predetermined location in the route has the following components:
  • a first recording unit which is set up in such a way that at least one reference image can be recorded at the predetermined location of the route
  • a first evaluation unit which is set up in such a way that an image of the reference object can be determined in the at least one reference image
  • a second recording unit which is set up in such a way that at least one test image can be recorded at the predetermined location of the route
  • a second evaluation unit that is set up in such a way that a further image of the reference object can be determined in the at least one test image
  • a third evaluation unit that is set up in such a way that by comparing the image of the reference object in the at least one reference image with the change of the reference object can be determined in the further image of the reference object in the at least one test image.
  • the arrangement is particularly suitable for carrying out the method according to the invention or one of its further developments explained below.
  • Reliability in determining the change in the reference object can be increased by taking several reference images and / or several test images at the specified location. It is expedient to record the reference images using different recording parameters, for example a recording angle. The same applies to the test images.
  • the reliability can be further increased if the reference image and the associated test image are recorded under the same recording parameters.
  • first partial image in the reference image and / or a second partial image in the test image which have the image or the further image.
  • the first partial image and the second partial image are compared with one another in the comparison.
  • first partial image in the reference image and / or the second partial image in the test image may also be useful to place the first partial image in the reference image and / or the second partial image in the test image such that the first partial image and / or the second partial image shows an environment associated with the reference object.
  • a partial image is a search mask. Using this search mask, a defined image area can be examined for the image, the further image or the change.
  • the comparison of the first with the second partial image can be realized particularly simply by the fact that a first ter pixel value of a first pixel of the first field is subtracted from a second pixel value of a second pixel of the second field.
  • a first pixel value and such a second pixel value can be, for example, brightness or color values (luminance or crominance values).
  • This subtraction of pixel values produces a difference image in which a change in the image between the image and the further image can be determined particularly easily.
  • the change in the reference object can be determined using the image change.
  • the difference image can also be processed further, for example by filtering and / or segmenting an image area of the difference image. This can increase the reliability in determining the change.
  • the image of the reference object in the reference image or the further image of the reference object is determined using an edge detection method or object recognition method. Such methods are known from [10] and [11].
  • the further image of the reference object in the test image can be determined in a particularly simple manner using a correlation method as is known from [9], [12] and [13].
  • the correlation between pixel values which belong to the image and pixel values which belong to the further image is determined.
  • the reliability in determining the change in the reference object can also be increased in that a first quantity of a geometric reference property of the reference object is determined using the image of the reference object in the reference image and one using the further image of the reference object in the test image second size of the same geometric reference property of the reference object is determined.
  • the comparison compares the first size with the second size.
  • a difference can be formed between the first and the second quantity and the change can be determined when the difference exceeds a threshold value.
  • the reference image and the test image are assigned to one another using a location code and / or a time code.
  • a location code can be, for example, a number which is assigned to the reference image and / or the test image.
  • a time code can, for example, be a time specification which is assigned to the reference image and / or the test image.
  • the reference object is broken down into several reference partial objects.
  • the reference object is a functional accessory for the route, for example a traffic engineering object.
  • the route can be a traffic connection, for example a railway line.
  • the reference object is an element of a contact line.
  • Such an overhead line can be an overhead line.
  • the reference object is an element of a longitudinal catenary of the overhead line or a transverse support device of the overhead line.
  • a reference object or one of its reference sub-objects can also be a basic element of the overhead contact line, in particular a rod or a tube or a rope or a wire, or a connecting element of the overhead contact line, in particular a holder or a clamp or a carrying element or an insulator.
  • the reference object is an element of a rail track.
  • a particularly simple arrangement of the invention can be realized in that the first recording unit and / or the second recording unit is in each case a digital camera.
  • An evaluation unit can be implemented in a particularly simple manner by means of a PC on which a computer program is stored, with which corresponding method steps can be carried out.
  • the arrangement is attached to a vehicle which is traveling on the route.
  • FIG. 1 shows a principle of an image evaluation by recognizing a change in an overhead line object
  • Figure 2 is a sketch of an overhead line of a railroad
  • Figure 3 shows an inspection vehicle according to the embodiment
  • Figure 4 is a sketch of a recording system for receiving a longitudinal chain
  • FIG. 5 shows a field of view for an inspection of a transverse support device
  • FIG. 6 shows a sketch which shows a determination of an evaluation window
  • FIG. 7a and 7b sketches, which illustrate methods for inspecting an overhead line according to an embodiment
  • Figure 8 is a sketch illustrating a method for inspecting an overhead line according to an embodiment
  • Figure 9 is a sketch with images that illustrate a definition of a search mask.
  • Exemplary embodiment automated optical inspection of an overhead line of a railway connection
  • FIG. 3 shows an inspection vehicle 300, a modified railcar, for monitoring a railway line.
  • the aim of the inspection is to detect a change in an overhead line of the railway line.
  • Such a change can arise, for example, from damage that occurs to an element of the overhead line or from a foreign body that gets caught in the overhead line.
  • a measure to remedy the change is initiated.
  • Such a measure can be, for example, repairing the damage or removing the foreign body.
  • the inspection system described below can be used not only for the inspection of an overhead line of a railway connection, but with a corresponding modification for the inspection of any element of a railway connection, for example a rail body or a rail sleeper.
  • a roof 301 of the inspection vehicle 300 there are a plurality of optical recording systems 302, 303, 304, 305 which, during an inspection trip of the inspection vehicle 300, record contact-free images of the overhead line from different directions at given recording locations 300 from different directions.
  • the optical recording systems 302, 303, 304, 305 are aligned in such a way that all the elements of the overhead line as well as their surfaces can be recognized on the pictures recorded by them, each belonging to one another for a location.
  • the optical recording systems 302 and 303 are used for monitoring and inspection of the transverse support devices 306, the optical recording system 304 is used for monitoring and inspection of the longitudinal catenary 307 and the optical recording system 305 is used for monitoring and inspection of the contact wire 308.
  • FIG. 2 shows an example of a recording location with an overhead line and elements of the overhead line, for example a longitudinal catenary 310 (see FIG. 2) and a transverse support device 311 (see FIG. 2).
  • All captured images are stored in a location and time-coded manner, so that each image can be uniquely assigned an associated location and time.
  • the stored images are evaluated with the help of an automatic image processing method described below.
  • the images of the inspection trip are compared with reference images taken at an earlier point in time at the same predetermined locations under the same recording parameters.
  • a reference image is assigned to an associated inspection image using the location and time codes assigned to the images.
  • the resolution of the recording systems 302, 303, 304, 305 must be approximately 1 to 2 mm.
  • the exposure time of a recording system 302, 303, 304, 305 must not be longer than approximately 45 microseconds. This results in a data volume to be saved of 100 MByte / s or 5 GByte / km.
  • FIG. 4 serves to accommodate the longitudinal chain mechanism 307 or 400.
  • Each diode line camera 404, 405 records a vertical image strip on one side of the longitudinal chain mechanism 400 within 45 microseconds.
  • the longitudinal chain 400 is illuminated.
  • Metal vapor headlights 406, 407 with a connected load of approximately 10 kW were initially considered as lighting 406, 407.
  • an infrared diode laser was used. In contrast to a metal vapor headlight, this illuminates exactly one field of view of the respective camera and no additional areas of no interest, so a power of 15 W is sufficient.
  • Any image disturbance that may occur, for example due to a swaying of the inspection vehicle, can be compensated for using continuously logged data from tank sensors.
  • a laser radar system 322, 323 [6] is located on the roof 301 near both end faces 320, 321 of the inspection vehicle 300, the beams of which radiate vertically upward recognize a contact wire side holder of a transverse support device 306.
  • the laser radar system 322 in front in the direction of travel detects a transverse support device 306, it triggers an image recording by a scanner camera 324 oriented in the direction of travel. After passing the transverse support device 306, a rear-facing scanner camera 325 is triggered. This creates pictures of an object from both sides.
  • Longitudinal chain mechanism 307 is drawn for the sake of clarity, only one beam fan 333. This is approximately vertical on a plane of the longitudinal chain mechanism 307, while the beam fans 331, 332 for the transverse support devices 306 are arranged almost horizontally.
  • Environmental influences that affect the measurements are minimized by the following measures:
  • narrow-band filters in front of the cameras only allow light with the wavelength of the infrared lasers described to pass through. This means that sunlight, as long as it does not shine directly into the cameras, can be suppressed.
  • the windows in front of the optics are safely protected against light rain during the measurement.
  • the view of the transverse support devices more than 10 m away can be obstructed, so that u. U. good measurement results can no longer be achieved.
  • Dust and soot can be carried out automatically with a warm washing liquid that is sprayed on with pressure.
  • the vehicle roof does not need to be stepped on here. If no measurements are taken, protective covers close the windows.
  • FIG. 1 A principle of an image evaluation 100 in the automated optical inspection of an overhead line of a railway connection is shown in FIG. 1 and is explained in the following.
  • the images (inspection images) 101 recorded during an inspection trip are transmitted to computers (industrial PCs) which are located inside the vehicle of the inspection vehicle.
  • the inspection images 102 are compressed 103 by means of digital signal processors to approximately 3% of their original data volume and, after being temporarily stored on a hard disk, transferred to a magnetic tape.
  • Such a magnetic tape can store all data from around 300 km of single track. Because of the hard disk acting as a buffer, it is not necessary to interrupt the measurement when changing the tape.
  • the automatic evaluation 110 can be carried out after the inspection trip, during longer waiting breaks or trips without Measurement.
  • the start of the evaluation 110 on the vehicle can be brought forward by installing additional computing technology.
  • a prerequisite for the image evaluation 110 is that a so-called reference run was carried out at an earlier point in time, during which the actual state (reference state) was recorded, assessed and reference data generated using reference images 102.
  • the reference images 102 and the inspection images 101 each correspond in terms of their location and in their exposure parameters.
  • FIG. 1 further shows a comparison 120 of a reference image 102 from the reference run with the corresponding inspection image 101 from a current inspection run.
  • Each of these three methods 131, 132, 133 is based on a comparison 130 of a reference image 102 with the corresponding test image 101.
  • this comparison 130 and 135 an image 136 of a selected object is first determined in the reference image.
  • An image 137 of this selected object is then likewise determined in the corresponding test image.
  • a change 135 of the selected object is determined 140 by comparing 135 the two images 136, 137 of the selected object or by comparing measured values which are determined using the images
  • FIG. 6 shows the type and structure of reference data for longitudinal chain mechanisms 601, 602. They are derived from a large number of very large overall images, each of which comprises the longitudinal chain mechanism 601, 602 between two transverse support devices 603, 604.
  • the reference data contain small drawing files 611, 612, 613, 614, the components such.
  • B. terminals 621, 622 in the target state their geometric dimensions and relations and route-related position information.
  • Ropes 631 and contact wires 632 are defined by their diameter and the fastening points 633, 634 located in the partial images.
  • FIG. 7a schematically shows a reference image 701 of a partial area of a transverse support device 702 (without contact wire and suspension cable).
  • Sub-images or evaluation windows 703, 704, 705, 706, 707 are identified by bright frames.
  • FIG. 8 shows a partial area of a transverse support device 801 in a test image 800.
  • the search image shows two search masks 802, 803 which were previously defined in the corresponding reference image.
  • search masks are generally defined in a reference image in such a way that they cover image areas, so-called search areas, between displayed objects. A foreign body can thus be identified when a search area in the reference image is compared with the corresponding search area in the test image.
  • FIG. 8 shows a loose rope end 810, which is recognized when the search area 802 of the test image 800 is compared with the corresponding search area in the associated reference image, in which the loose rope end is not present.
  • an additional object for example a foreign body, which is depicted in the test image but not depicted in the reference image, can be recognized in a simple manner.
  • a search mask is defined according to the following procedure (Fig. 9):
  • a selected reference image 900 which has different objects 901, 902, 903 and whose pixels have different gray values 904, 805, is binarized 810.
  • the objects 901, 902, 903 appear white. The remaining areas appear black.
  • the search areas 932, 933, 934 are defined in such a way that each associated black area is surrounded by a search mask.
  • the different parts of the search mask are combined and saved in a single binary search mask image.
  • This alternative describes a method for location coding for the assignment of reference image to test image:
  • a position measuring system is continuously recorded for the images, for the reference images as well as for the test images during the respective recording journey.
  • a special system for recognizing a main object e.g. the cross support device for electrical railways
  • the presence of a cross support device and thus a support mast with the associated location is also recorded.
  • the crossbeams and thus their masts can be counted and numbered along the route. During inspection, these numbers are used to assign the correct reference images to the corresponding test images.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)
  • Image Analysis (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

L'invention concerne un procédé et un système permettant de déterminer une modification intervenue dans un objet de référence, qui appartient à une voie carrossable et qui se trouve en un endroit prédéfini de la voie carrossable. Selon l'invention, au moins une image de référence est prise à un premier moment, à l'endroit prédéfini. Une image de l'objet de référence est déterminée dans l'image de référence (au moins au nombre de une). Au moins une image de vérification est prise à un second moment à l'endroit prédéfini de la voie carrossable. Une autre image de l'objet de référence est déterminée dans l'image de vérification (au moins au nombre de une). Une comparaison entre l'image de l'objet de référence dans l'image de référence (au moins au nombre de une) et l'autre image de l'objet de référence dans l'image de vérification (au moins au nombre de une) permet de déterminer une modification intervenue dans l'objet de référence.
EP01971680A 2000-09-06 2001-08-29 Procede et systeme pour determiner une modification intervenue dans un objet de reference Withdrawn EP1374175A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10043945 2000-09-06
DE10043945 2000-09-06
PCT/DE2001/003314 WO2002021445A2 (fr) 2000-09-06 2001-08-29 Procede et systeme pour determiner une modification intervenue dans un objet de reference

Publications (1)

Publication Number Publication Date
EP1374175A2 true EP1374175A2 (fr) 2004-01-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01971680A Withdrawn EP1374175A2 (fr) 2000-09-06 2001-08-29 Procede et systeme pour determiner une modification intervenue dans un objet de reference

Country Status (4)

Country Link
EP (1) EP1374175A2 (fr)
JP (1) JP2004508643A (fr)
NO (1) NO325105B1 (fr)
WO (1) WO2002021445A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10345861A1 (de) * 2003-10-01 2005-05-12 Db Netz Ag Verfahren zur berührungslosen Messung von Winkeln und Abständen
DE102005003063A1 (de) * 2005-01-22 2006-08-03 Framatome Anp Gmbh Verfahren und Vorrichtung zur Ermittlung der Abweichung eines entlang eines Ist-Weges translatorisch geführten Körpers von einem Soll-Weg
DE102006031487B4 (de) * 2006-07-06 2011-06-16 Institut für Bahntechnik GmbH Verfahren zur Fahrdrahtanhubmessung
JP5698285B2 (ja) * 2013-03-04 2015-04-08 公益財団法人鉄道総合技術研究所 架線位置計測装置及び方法
DE102020201401A1 (de) * 2020-02-05 2021-08-05 Siemens Mobility GmbH Messvorrichtung zur Ermittlung der Fahrdrahtlage

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Publication number Priority date Publication date Assignee Title
DE2440085A1 (de) * 1974-08-19 1976-03-04 Licentia Gmbh Einrichtung zur beruehrungslosen messung der hoehe und seitenlage des fahrdrahtes bei elektrischen bahnen
US4779095A (en) * 1986-10-28 1988-10-18 H & G Systems, Inc. Image change detection system
US6064428A (en) * 1996-08-05 2000-05-16 National Railroad Passenger Corporation Automated track inspection vehicle and method
DE19634060C1 (de) * 1996-08-23 1998-01-22 Fraunhofer Ges Forschung Fahrdrahtmeßvorrichtung

Non-Patent Citations (1)

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Title
See references of WO0221445A2 *

Also Published As

Publication number Publication date
NO325105B1 (no) 2008-02-04
NO20030992L (no) 2003-05-05
WO2002021445A3 (fr) 2003-10-09
NO20030992D0 (no) 2003-03-03
WO2002021445A2 (fr) 2002-03-14
JP2004508643A (ja) 2004-03-18

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