WO2003083412A1 - Procede de mesure et dispositif de mesure correspondant - Google Patents

Procede de mesure et dispositif de mesure correspondant Download PDF

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Publication number
WO2003083412A1
WO2003083412A1 PCT/DE2003/000274 DE0300274W WO03083412A1 WO 2003083412 A1 WO2003083412 A1 WO 2003083412A1 DE 0300274 W DE0300274 W DE 0300274W WO 03083412 A1 WO03083412 A1 WO 03083412A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement object
image
size
reference element
measuring device
Prior art date
Application number
PCT/DE2003/000274
Other languages
German (de)
English (en)
Inventor
Michael Gehri
Joerg Stierle
Peter Wolf
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2003083412A1 publication Critical patent/WO2003083412A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels

Definitions

  • the invention is based on a measuring method according to the preamble of claim 1.
  • Laser distance measuring devices which direct a modulated laser beam onto a measurement object and collect the laser beam again after reflection on the measurement object, so that the distance to the measurement object can be determined by means of a transit time measurement.
  • such laser distance measuring devices usually have target optics which display a scale in the image of the measurement object, by means of which the user can determine the lateral extent of the measurement object. To do this, the user must read how many graduations of the scale the measurement object covers in the image taken by the target optics. Taking into account the measured distance to the measurement object and the specified imaging The lateral extent of the target can then be calculated.
  • laser distance measuring devices which enable the width of a measurement object to be measured without the user having to carry out complex calculations.
  • Hierz u the user measures the distance to two points on the measurement object, the lateral distance of which is to be determined.
  • the laser distance measuring device uses an integrated computer to calculate the lateral distance from the two measured distances and the angle between the two points using an integrated computer.
  • the invention enables the size of a measurement object to be determined with only a single distance measurement, without the user himself having to carry out complex calculations.
  • the fact is exploited that the image size of the measurement object in the image taken by a target optics only depends on the size of the measurement object, the distance to the measurement object and the imaging scale of the target optics.
  • the invention therefore preferably provides that the image size of the measurement object is determined in the image taken by the target optics in order to calculate the size of the measurement object from this, taking into account the measured distance and the known imaging scale of the target optics.
  • the image size of the measurement object in the image recorded by the target optics is preferably determined by inserting a reference marking into the image, the reference marking being adapted such that the size of the reference marking corresponds to the image size of the measurement object.
  • the reference marking can be generated, for example, by a physical reference element which is arranged in the receiving area of the target optics between the target optics and the measurement object, so that in addition to the image of the measurement object, the image of the reference element also appears in the image recorded by the target optics. From 'the size of the reference element, the Some images of the target optical system and the position of the reference element sfarstab relative to the target optical system can then be the image size of the object to be measured calculate, if care is taken that the image of the reference element having the same size as the image of the measured object.
  • the reference element can be moved, for example, in the recording area along the optical axis of the target optics until the image of the reference element is as large as the image of the measurement object.
  • the size of the reference element is changed until the reference element and the measurement object generate images of the same size.
  • a slit diaphragm can be used as the reference element, the slit width being set such that the image of the slit is as exactly as possible the same size as the image of the measurement object.
  • the adjustment of the slotted de can be done manually by the user or by an electric motor or other actuator.
  • the reference marking is generated electronically, for example by inserting two pointers into the image recorded by the target optics.
  • the two pointers can then be positioned by the user by means of suitable operating elements in the image recorded by the target optics at the borders of the image generated by the measurement object.
  • the distance between the two pointers in the coordinate system of the image recorded by the target optics then corresponds to the image size of the measurement object and, together with the known imaging scale of the target optics and the measured distance to the measurement object, enables the calculation of the lateral extent of the measurement object.
  • the image size of the measurement object can also be made by an image processing unit by determining the contours of the measurement object in the image recorded by the target optics.
  • the size of the measurement object can also be determined without target optics by determining the virtual lateral extent of the measurement object.
  • a slit diaphragm with an adjustable slit width can be used, which is arranged at a predetermined distance from the viewer in his field of vision. The viewer then sees the measurement object through the slit diaphragm, the slit width being set such that the slit width is equal to the virtual lateral extent of the measurement object. This means that the slit diaphragm limits the image of the measurement object perceived by the viewer.
  • the size of the measurement object can then be calculated from the distance between the viewer and the slit diaphragm, which is assumed to be known, the measured slit width and the measured distance from the measurement object.
  • FIG. 1 shows a measuring device according to the invention as a block diagram
  • FIG. 2 shows an alternative embodiment of a measuring device according to the invention, in which the size of the measurement object is determined automatically
  • FIG. 3 shows another embodiment of a measurement device according to the invention with a slit diaphragm for measuring the size of the measurement object
  • FIG. 4 shows the method according to the invention as a flowchart
  • 5 shows a schematic radiation-optical representation for calculating the size of the measurement object. Description of the embodiments
  • the measuring device according to the invention shown in FIG. 1 initially enables the distance of a measurement object to be measured in a conventional manner.
  • the measuring device has a control unit 10 which triggers a laser 12 to emit a modulated laser beam.
  • the measuring device with the laser 12 is held in such a way that the laser beam strikes the measurement object and is reflected by it.
  • An optical sensor 14 detects the reflected laser beam and in the process outputs a trigger signal to the control unit 10, which calculates the transit time of the laser beam from the time period between the delivery of the laser beam by the laser 12 and the reception of the reflected laser beam by the sensor 14.
  • the control unit 10 calculates the distance d to the measurement object from the transit time and the known speed of light.
  • control unit 10 is connected on the output side to a graphics driver 16 which controls a screen 18 integrated in the measuring device.
  • the current distance d from the object to be measured is thus continuously displayed on the screen 18.
  • the measuring device has a camera 20 which supplies an image signal to the graphics driver 16 so that the image recorded by the camera 20 is displayed on the screen 18.
  • the camera 20 is mounted in the measuring device in such a way that the optical axes of the camera 20 and the laser 12 par- allel to each other so that the user can easily align the laser 12 to the object to be measured using the image recorded by the camera 20 and displayed on the screen 18.
  • the user is supported by a crosshair that the graphics driver 16 fades into the image.
  • the measuring device has two joysticks 22.1, 22.2 connected to the graphics driver 16, with which the user can move two screen pointers on the screen 18. To measure the size of the measurement object, the user then moves the two screen pointers within the image shown on the screen 18 to the opposite limits of the measurement object and confirms the correct positioning of the screen pointers.
  • the associated screen coordinates xl, yl or x2, y2 are then supplied to a computing unit 24, which uses this to calculate the distance between the two screen pointers, this distance corresponding to the image size B of the measurement object.
  • the image size B of the measurement object determined in this way is then supplied to a further arithmetic unit 26, which calculates the actual size G from the measured distance d to the measurement object, the image size B of the measurement object on the screen 18 and the known imaging properties of the camera 20 of the measurement object.
  • the computing unit 26 is connected to the graphics driver 16, which outputs the size G of the measurement object on the screen 18 as a numerical value.
  • the exemplary embodiment of a measuring device according to the invention shown in FIG. 2 largely corresponds to the exemplary embodiment described above and shown in FIG. 1, so that the same reference numerals are used below for corresponding components and for
  • the measuring device has an image processing unit 28, which is connected on the input side to the camera 20 and analyzes the image signal generated by the camera 20 in order to determine the contours of the measurement object in the image.
  • the image processing unit determines the greatest lateral extent of the measurement object in the image in screen coordinates and passes this value to the computing unit 26 as image size B.
  • the computing unit 26 then calculates the size G of the measurement object in the manner described above.
  • FIG. 3 The exemplary embodiment of a measuring device according to the invention shown in FIG. 3 also largely corresponds to the exemplary embodiment described above and shown in FIG. 1, so that the same reference numerals are used below for corresponding components and reference is made to the above description in order to avoid repetition ,
  • a special feature of this exemplary embodiment is that conventional target optics 30 are provided instead of the camera 20 for aiming at the measurement object.
  • the target optics 30 is also mounted in the measuring device in such a way that the optical axes of the target optics 30 and the laser 12 run parallel to one another.
  • a slit diaphragm 32 with an adjustable slit width SB is integrated into the target optics 30, the slit width SB being set by the user in such a way that the measurement object is not just covered in the image.
  • the slot width SB is then fed to a computing unit 34, which calculates the image size B of the measurement object from it.
  • the computing unit 34 is connected to the computing unit 26, which calculates the size of the measurement object in the manner described above.
  • the measuring device likewise has a graphics driver 16 'and a screen 18', but in this case the screen 18 'only serves to display the measured distance d and the size G of the measurement object.
  • FIG. 4 illustrates the course of the measuring method according to the invention, reference being made to the simplified radiation-optical illustration in FIG.
  • the distance d to the object to be measured is first measured in a conventional manner, as has already been explained in detail above.
  • the image size B of the measurement object is then determined, the image size B 'indicating the size in which the measurement object appears on the screen 18 or in the target optics 30.
  • the size G of the measurement object is then calculated from the image size B, the distance d to the measurement object and the known effective focal length f of the camera 20 or the target optics 30 in accordance with the radiation-optical formula - - f d f f.
  • control unit 30 target optics

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé de mesure comprenant les étapes consistant à : mesurer l'éloignement (d) d'un objet de mesure ; déterminer une étendue latérale virtuelle (B) de l'objet de mesure ; calculer la grandeur (G) de l'objet de mesure, en fonction de l'éloignement (d) mesuré et de l'étendue latérale virtuelle (B) déterminée de l'objet de mesure. L'invention se rapporte en outre à un dispositif de mesure correspondant.
PCT/DE2003/000274 2002-03-30 2003-01-31 Procede de mesure et dispositif de mesure correspondant WO2003083412A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10214462.1 2002-03-30
DE2002114462 DE10214462A1 (de) 2002-03-30 2002-03-30 Meßverfahren und entsprechende Meßeinrichtung

Publications (1)

Publication Number Publication Date
WO2003083412A1 true WO2003083412A1 (fr) 2003-10-09

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ID=28458513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/000274 WO2003083412A1 (fr) 2002-03-30 2003-01-31 Procede de mesure et dispositif de mesure correspondant

Country Status (2)

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DE (1) DE10214462A1 (fr)
WO (1) WO2003083412A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552204A (en) * 1941-10-16 1943-03-26 Cyril Alderson Lund Improvements in and relating to range finders
US4837717A (en) * 1986-02-04 1989-06-06 Geotronics Ab Device for measuring substantially vertical, circular-cylindrical objects

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3212218B2 (ja) * 1994-05-26 2001-09-25 三菱電機株式会社 車両用障害物検出装置
US5616903A (en) * 1995-01-26 1997-04-01 The Brunton Company Electronic rangefinder apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552204A (en) * 1941-10-16 1943-03-26 Cyril Alderson Lund Improvements in and relating to range finders
US4837717A (en) * 1986-02-04 1989-06-06 Geotronics Ab Device for measuring substantially vertical, circular-cylindrical objects

Also Published As

Publication number Publication date
DE10214462A1 (de) 2003-10-23

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