WO2012069664A1 - Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle - Google Patents

Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle Download PDF

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Publication number
WO2012069664A1
WO2012069664A1 PCT/ES2010/070755 ES2010070755W WO2012069664A1 WO 2012069664 A1 WO2012069664 A1 WO 2012069664A1 ES 2010070755 W ES2010070755 W ES 2010070755W WO 2012069664 A1 WO2012069664 A1 WO 2012069664A1
Authority
WO
WIPO (PCT)
Prior art keywords
light sources
housing
lighting device
section
coupled
Prior art date
Application number
PCT/ES2010/070755
Other languages
English (en)
Spanish (es)
Inventor
José Angel GUTIÉRREZ OLABARRIA
Alfredo Bilbao Martxueta
Original Assignee
Fundación Robotiker
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 Fundación Robotiker filed Critical Fundación Robotiker
Priority to PCT/ES2010/070755 priority Critical patent/WO2012069664A1/fr
Publication of WO2012069664A1 publication Critical patent/WO2012069664A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features

Definitions

  • the present invention falls within the technical field of object inspection systems and, particularly, in the field of lighting systems for the inspection of objects by artificial vision.
  • the illumination is of paramount importance since the possible brightness and shadows that can take place based on the geometry and the characteristics of the surface of the object to inspect can distort the quality and accuracy of the images captured by inspection cameras.
  • CDI Cloudy Day lllumination
  • MICROSCAN MICROSCAN
  • DOM2414 system DCM SYSTEMES
  • DCI uniform diffused light from the same axis of the camera is used to illuminate the object from all directions with diffused light and with high intensity light incident on the object at a very small angle, so that shadows are eliminated and glitters.
  • the object of the present invention is to overcome the drawbacks of the state of the art detailed above, by means of a brightness-free lighting device for the inspection of objects by artificial vision, which comprises a dome lighting system with a plurality of light sources, a diffusing surface of light that reflects light emitted by the light sources to illuminate with diffuse uniform light an object to be inspected, the light sources and the diffusing surface being located in the housing with a front opening and rear opening; That characterized because
  • the light diffusing surface has a substantially toroidal shape with a geometric axis of revolution
  • the front opening is a front central opening
  • the rear opening is a rear central opening, said central openings being substantially concentric with the diffusing surface
  • the light sources comprise front light sources adjacent to the front central opening and rear light sources adjacent to the rear central opening, the front light sources being distanced from the rear light sources by a lighting section in which the object to be inspected is illuminated;
  • the light sources are arranged concentrically with the diffusing surface and oriented to illuminate the diffusing surface;
  • the apparatus comprises means for arranging at least one vision camera, and preferably several vision cameras that focus on the object to be inspected from equidistant angular positions, being able, for example, to have four vision cameras arranged by couples that focus on the object to be inspected from diagonal positions opposite.
  • the means for arranging the vision cameras may comprise, for example, side tubes that flow into respective side holes in the diffuser surface.
  • the side holes can be sealed respectively by a transparent material and / or by a semi-mirror
  • the diffuser surface may have, in its outer part, a vertical semicircle cross section! or parabolic, and a semi-circular horizontal cross section! or parabolic
  • the light sources which can be light emitting diodes (LEDs)
  • the light sources comprise at least two rows of front light sources and a! minus two rows of back light sources. These rows of light sources can be arranged annularly around the geometric axis of revolution of the diffuser surface.
  • the housing has a hollow toroid shape whose geometric axis of revolution coincides with the geometric axis of revolution of the diffuser surface.
  • the front light sources may be arranged in a front portal light element comprising a clamping part coupled to the housing around the front central opening and a light part part on whose external face the front light sources are arranged.
  • the rear light sources can be arranged in a rear portauminary element comprising a clamping part coupled to the housing around the rear central opening and a portal part on whose external face the rear light sources are arranged.
  • the housing may comprise a front annular section surrounding the front central opening, and a rear annular section surrounding the rear central opening. These annular sections are flat at least on their side directed inside the housing.
  • the clamping part of the front carrier element is coupled to the front annular section, while the clamping part of the rear carrier element is coupled to the rear annular segment.
  • the housing may comprise a first half with an internal dome-shaped surface, and a second half with a second internal dome-shaped surface, the halves being joined by their respective bases.
  • the front central opening is composed of two complementary front recesses provided in the respective front edges of the bases the halves of the housing.
  • the rear central opening consists of two complementary rear entrances provided on the respective rear edges of the bases, the halves of the housing, while the diffusing surface is formed by the domes formed by said internal surfaces.
  • the front portauminary element may comprise a first front carrier element coupled to the first half of the housing bordering the front recess of said first half, and a second front carrier element coupled to the second half of the housing bordering the recess front of said second half of the housing.
  • the rear portauminary element in this case comprises a first rear carrier element coupled to the first half of the housing bordering the rear inlet of said first half, and a second rear carrier element coupled to the second half of the housing bordering the rear recess of said second half.
  • the front annular portion may be composed of a first front arcuate section that borders the front recess in said first half of the housing and a second front arcuate section that borders on the front recess in said second half of the housing, while the rear annular section is composed of a first section rear arc that borders the rear recess in said first half of the housing and a second rear arcuate section that borders in rear recess in said second half of the housing.
  • the fastening part of the first front bearer element can be coupled to said first front arcuate section, the fastening part of the second front bearer element to said second frontal arcuate section, the fastening part of the first rear bearer element to said first rear arcuate section, and the securing part of the second front carrier element to said second rear arcuate section.
  • the present invention achieves its object by means of a device of simple structure and of easy use, which allows to effectively illuminate objects to be inspected, such as for example bars or profiles, of different cross sections.
  • Figure 1 is a partially sectioned front elevational view of an embodiment of an image capture device incorporating an embodiment of the lighting system according to the present invention
  • Figure 2 is a partially sectioned side elevation view of the device shown in Figure 1;
  • Figure 3 is a partially sectioned side-side perspective view of the device shown in Figure 1;
  • Figure 4 is an antero-lateral perspective view of the device shown in Figure 1 partially disassembled;
  • Figure 5 is an antero-lateral perspective view of the components that make up the upper half of the device shown in Figure 1.
  • the lighting system comprises a -1-hollow housing composed of two halves -2, 3- symmetrical.
  • the two halves -2, 3- of the housing -1 - are joined by flanges -2a, 3a- that emerge from their respective free edges facing each other.
  • the housing -1 - On its front side and on its rear side, the housing -1 - respectively comprises a front central opening -4- and an axially aligned rear central opening -5-, through which a profile to be inspected can move axially -6- passing through the inside of the housing -1 -.
  • the housing -1 - there are four lateral tubes -7, 8, 9, 10- arranged in pairs in diagonally opposite locations, and leading into the interior of the housing -1 - through of two side holes.
  • the side tubes -7, 8, 9, 10- are installed two vision cameras -1 1, 12, 13, 14- that focus inside the housing -1 - to capture images of the profile to be inspected -6-.
  • the two halves -2, 3- of which the housing -1 is composed form a set of two symmetrical domes, with an annular frontal plane section -2b, 3b- surrounding the opening front center -4-, and a flat rear annular section -2c, 3c- that surrounds the rear central opening -5-.
  • the central front opening -4- is composed of two front recesses -4a, 4b- semicircular respectfully provided for the respective front edges of the first half -2- and the second half -3- of the housing -1 -
  • opening rear center -5- is composed of two front recesses -5a, 5b- semicircular provided respectfully at the rear edges of the first half -2- and the second half -3- of the housing -1 -.
  • each flat annular section -2b, 3b; 2c, 3c- consists of an arcuate flat section -2b, 2c- of the first half -2- and an arcuate flat section -3b, 3c- of the second half of the housing 1.
  • each carrier element -15a, 15b, 16a, 16b, 17a, 17b, 18a, 18b- of light sources -19, 20, 21, 22- is mounted on each arched flat section -2b, 3b, 2c, 3c- a carrier element -15a, 15b, 16a, 16b, 17a, 17b, 18a, 18b- of light sources -19, 20, 21, 22- is mounted.
  • Each carrier element - comprises a part that is held -15a, 16a, 17a, 18a- attached and attached to one of the respective arcuate flat sections -2b, 2c, 3b.
  • Each of the respective internal surfaces -2d, 3d- of halves -2, 3- of the housing -1 - has a domed interior contour substantially in the form of dome, and is internally coated with a conventional light diffuser coating, such as paint or other matt white material.
  • the respective domes are faced so that their internal surfaces -2d, 3d- form a light diffusing surface so that it has a substantially toroidal shape, which envelops the profile to be inspected -6-, and that has a geometric axis of revolution
  • A-A The curvatures of the light diffusing surface and the positions of the light sources -19, 20, 21, 22- are designed so that the light emitted by the light sources -19, 20, 21, 22- is reflected and blurred such that it illuminates the profile to be inspected -6- on all its sides without glare and shadow areas that could negatively interfere with the image capture of the profile -6- by the vision cameras -1 1, 12, 13-14- .
  • the light sources are arranged concentrically with the diffuser surface -2d, 3d- with respect to the geometric axis of revolution A-A of the diffuser surface -2d, 3d-.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage sans zones brillantes permettant l'inspection de pièces, lequel dispositif comprend une surface de diffusion de lumière (2d, 3d) présentant une forme toroïdale correspondant à la surface interne de la carcasse (1), une carcasse (3) présentant une ouverture centrale avant (4) et une ouverture centrale arrière (5) concentriques à la surface de diffusion (2d, 3d), des sources lumineuses avant (19, 20) adjacentes à l'ouverture centrale avant (4) et des sources lumineuses arrière (21, 22) adjacentes à l'ouverture centrale arrière (5), les sources lumineuses avant (19, 20) étant espacées des sources lumineuses arrière (20, 21) par un segment d'éclairage (B-B) où un objet à inspecter (6) est éclairé. Les sources lumineuses (19, 20, 21, 22) sont placées de manière concentrique à la surface de diffusion (2d, 3d) et orientées de manière à éclairer la surface de diffusion (2d, 2d).
PCT/ES2010/070755 2010-11-22 2010-11-22 Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle WO2012069664A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/070755 WO2012069664A1 (fr) 2010-11-22 2010-11-22 Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/070755 WO2012069664A1 (fr) 2010-11-22 2010-11-22 Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle

Publications (1)

Publication Number Publication Date
WO2012069664A1 true WO2012069664A1 (fr) 2012-05-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2010/070755 WO2012069664A1 (fr) 2010-11-22 2010-11-22 Dispositif d'éclairage sans zones brillantes permettant l'inspection d'objets par vision artificielle

Country Status (1)

Country Link
WO (1) WO2012069664A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870150A (ja) * 1981-10-22 1983-04-26 Fuji Electric Co Ltd 光学検査装置用照明器
GB2155630A (en) * 1983-10-28 1985-09-25 Hauni Werke Koerber & Co Kg Apparatus for testing rod-shaped products of the tobacco processing industry
JPH02161339A (ja) * 1988-12-14 1990-06-21 Koyo Mach Ind Co Ltd 球面検査装置
US5051872A (en) * 1988-07-19 1991-09-24 Texas Instruments Incorporated Hemispherical non-glare illuminator
EP1072884A2 (fr) * 1999-07-28 2001-01-31 KELLY, William, M. Améliorations se rapportant à l'éclairage annulaire
US20070097686A1 (en) * 2005-11-02 2007-05-03 Dunn Sheila B Illuminator-especially for cylindrical curved surfaces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870150A (ja) * 1981-10-22 1983-04-26 Fuji Electric Co Ltd 光学検査装置用照明器
GB2155630A (en) * 1983-10-28 1985-09-25 Hauni Werke Koerber & Co Kg Apparatus for testing rod-shaped products of the tobacco processing industry
US5051872A (en) * 1988-07-19 1991-09-24 Texas Instruments Incorporated Hemispherical non-glare illuminator
JPH02161339A (ja) * 1988-12-14 1990-06-21 Koyo Mach Ind Co Ltd 球面検査装置
EP1072884A2 (fr) * 1999-07-28 2001-01-31 KELLY, William, M. Améliorations se rapportant à l'éclairage annulaire
US20070097686A1 (en) * 2005-11-02 2007-05-03 Dunn Sheila B Illuminator-especially for cylindrical curved surfaces

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WILSON, A.: "Vision Systems", vol. 15, January 2010, article "Novel Illumination - Innovative LED lighting products are putting machine vision in a new light"

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