FR2867857A1 - Aspect and constraint images forming device for glass article e.g. bottle, has object lens that forms intermediate image, image transfer units traversed by beams, where images are sent towards respective cameras - Google Patents

Aspect and constraint images forming device for glass article e.g. bottle, has object lens that forms intermediate image, image transfer units traversed by beams, where images are sent towards respective cameras Download PDF

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Publication number
FR2867857A1
FR2867857A1 FR0402751A FR0402751A FR2867857A1 FR 2867857 A1 FR2867857 A1 FR 2867857A1 FR 0402751 A FR0402751 A FR 0402751A FR 0402751 A FR0402751 A FR 0402751A FR 2867857 A1 FR2867857 A1 FR 2867857A1
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image
article
images
forming
controlling
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FR2867857B1 (en
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Andrea Molinaro
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SGCC
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SGCC
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/90Investigating the presence of flaws or contamination in a container or its contents
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems

Abstract

The invention relates to a device (22) for forming first (24) and second (26) images of the same article (12), of the type comprising means (28) for separating an optical beam (30) emitted by the article (12) into first (32) and second (34) separate beams transmitted to first (18) and second (20) image receivers. The device (22) includes an objective (36) forming an intermediate image (38) of the article (12), the separating means (28) being interposed optically between the intermediate image (28) and the two receivers of image (18, 20), first (40) and second (42) image transport means being interposed optically between the separating means (28) and the first (18) and second (20) image receptors of to respectively pass through the first (32) and second (34) separate beams and to each carry the intermediate image (38) to the corresponding image receiver (18, 20).

Description

The present invention relates to a training device of first and

  second images of the same article, a device for controlling an article and a method for controlling an article.

  It applies in particular to the quality control of glass articles, especially the control of bottoms of bottles manufactured industrially.

  Usually, the bottom of a glass bottle, manufactured by a conventional molding process, is likely to have certain defects such as: inclusions, which correspond for example to fragments of metal, refractory materials or foreign matter taken in the mass of the bottle; broths formed by air bubbles in the wall of the bottle; folds of the outer surface of the bottle; glass residues fallen inside the bottle; or malformations of the inner root of the article.

  Furthermore, the bottom of a bottle is likely to include molded reliefs, sometimes recessed, which contribute in particular to the stability of the bottle, its identification, or its location in positioning for subsequent operations. If necessary, these molded reliefs may be defective.

  To verify the absence of any crippling defect, including inclusion, broth, crease or embossed defect, it is known to perform two checks of the bottom of a bottle, each adapted to the detection of certain defects.

  A first control, called an aspect control, is performed by means of a first CCD camera. The image supplied by the first camera is analyzed conventionally by means of image processing software which in particular determines a contour of the bottom of the bottle in order to delimit an area to be analyzed. The aspect control makes it possible to detect certain defects, in particular broths, folds or even inclusions that are distant from the non-defective reliefs. However, the aspect control does not detect the inclusions located in the molded reliefs because these reliefs obscure the inclusions.

  A second control, called stress control, is performed by means of a second CCD camera. This stress control uses the fact that an inclusion produces stresses in the glass that have a polarizing effect on the light passing through the glass. Two polarizing filters oriented substantially orthogonally between them are therefore associated with the second CCD camera. The image provided by the second camera is generally dark (due to the orthogonal relative orientation of the polarizing filters) except at the locations of the inclusions which correspond to light spots. The constraint control thus conventionally comprises a step of analyzing the image supplied by the second camera during which the presence of any light spots corresponding to defects influencing the polarization of the light is detected.

  However, it is usually not possible to determine the bottom contour of the bottle during stress control with great accuracy because the image is dark. This control also makes it possible to detect certain defects such as broths.

  If necessary, the image provided by the second camera may include clear spots that do not correspond to faults, called false alarms. In fact, the lens also polarises the light that passes through it under grazing incidence or that reflects on it.

  Generally, the false alarms are located outside the outline of the bottom of the bottle. Clear spots corresponding to defects could thus be distinguished from those corresponding to false alarms depending on their location inside or outside the bottom contour of the bottle.

  However, it is not possible to determine this contour from the image provided by the second camera since this image is dark, with the exception of any light spots corresponding to defects likely to influence the polarization of the light. or false alarms.

  In addition, the outline of the bottom of the bottle determined by the analysis of the first image can not be transposed to the second image. Indeed, the first and second cameras each having their own lens, each image depends on the properties and the setting of the lens of the corresponding camera. The contour determined by the analysis of the first image is therefore not transferable to the second image to allow a reliable sorting between the light spots located inside the contour, corresponding to defects, and the light spots located at the top of the image. outside this contour, corresponding to false alarms.

  It should be noted that the appearance and stress checks, which do not make it possible to detect the same defects, are complementary.

  It is known to carry out the appearance and stress checks by means of a device for forming first and second images of the same article, of the type comprising means for separating an optical beam emitted by the article in question. first and second separate beams transmitted to first and second image receivers.

  Usually, the means for separating the optical beam emitted by the article comprise semi-reflective plates and the first and second image receivers respectively comprise the first and second CCD cameras mentioned above. However, because the appearance and stress controls are made from images formed by different lenses, the reliability and effectiveness of bottom control of a bottle is limited.

  The invention particularly aims to optimize the reliability and efficiency of a device for forming first and second images of the same article of the aforementioned type.

  For this purpose, the subject of the invention is a device for forming a first and second image of the same article, of the aforementioned type, characterized in that it comprises an objective forming an intermediate image of the article, the means of separation being interposed optically between the intermediate image and the two image receptors, first and second image transport means being interposed optically between the separation means and the first and second image receptors so as to be traversed respectively by the first and second separate beams and each carrying the intermediate image to the corresponding image receiver.

  Thanks to the invention, each of the image receivers receives the intermediate image of the article formed by the single lens. The first and second images of the article received by the two image receivers are therefore identical.

  A device for forming first and second images of the same article may further comprise one or more of the following features: the device comprises a diaphragm interposed optically between one of the image receptors and its respective image transport means ; the diaphragm comprises a part integral with one of the image transport means; the device comprises a first polarizer interposed optically between one of the image receptors and its respective image transport means; the first polarizer is integral with one of the image transport means; the separation means comprise a separator cube; the device comprises a field lens interposed optically between the objective and the separation means in order to increase the collected luminosity.

  The subject of the invention is also a device for controlling an article, of the type comprising means for acquiring first and second images of the article, called appearance and constraint images, respectively, and means for determining an outline of the article from the first image, characterized in that it comprises means for analyzing the second image using the determined contour from the first image.

  The device for controlling an article according to the invention makes it possible to determine the contour of the article relatively precisely on the constraint image whereas it is not possible from this single image.

  A device for controlling an article according to the invention may further comprise one or more of the following features: the acquisition means of the first and second images comprise first and second acquisition devices respectively forming the first and second image receivers of an image forming device according to the previously defined invention; the first and second acquisition devices are cameras, for example of the CCD or CMOS type; the cameras are synchronous; the control device comprises a light box for illuminating a transparent article placed between the light box and the objective; the control device comprises a second polarizer interposed optically between the light box and the article, the first and second polarizers being arranged so that their polarization directions are substantially orthogonal.

  The subject of the invention is also a method for controlling an article, of the type in which first and second images of the article, called appearance and stress images respectively, are produced, and a contour of the article is determined. article from the first image, characterized in that an analysis zone of the second image is defined from the contour.

  A control method according to the invention may further comprise the characteristic that the first and second images are produced by means of the same objective.

  The invention will be better understood on reading the description which will follow, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a diagram of a device for controlling an article according to the invention; Fig. 2 is a diagram of an aspect image obtained by a first image receiver of the control device of Fig. 1; FIG. 3 is a diagram of a mask determined by a first acquisition device from the aspect image of FIG. 2; FIG. 4 is a diagram of a constraint image acquired by a second acquisition device of the control device of FIG. 1; FIG. 5 is a diagram showing the constraint image of FIG. 4 masked by the mask of FIG. 3.

  A device for controlling an article according to the invention is shown in FIG. 1. This control device is designated by the general reference 10.

  Glass items 12 to be inspected, for example bottles or glasses, are arranged on a conveyor 14. Particular attention will be paid to the bottom control of the glass articles 12 but the invention can be applied to any what part of the articles.

  The control device 10 comprises a conventional light box 16 for illuminating the glass article 12 from below, and first 18 and second acquisition devices for collecting light from the light box 16 after she crossed the transparent 12 glass article. The acquisition devices 18 and 20 are preferably cameras of the CCD or CMOS type.

  The control device 10 also comprises a device 22, according to the invention, intended to form first 24 and second 26 images of the glass article 12. The first 18 and second 20 cameras form first and second image receivers of this image forming device 22.

  The first camera 18 is intended to carry out an aspect control of the glass article 12, so that the first camera "aspect camera 18" and the first image "image 24" will be called later. .

  The second camera 20 is intended to perform a stress check of the glass article 12, so that the second camera "constraint camera 20" and the second image "image of stress 26" will be called later.

  The image forming device 22 comprises means 28 for separating an optical beam 30 emitted by the glass article 12 into first and second 34 separate beams emitted towards the first 18 and second 20 cameras.

  The separation means 28 are made for example by means of a separator cube 28 which has the advantage of limiting the distortions with respect to a semi-reflecting plate.

  The image forming device 22 is also provided with an objective 36 forming an intermediate image 38 of the article 12, the separator cube 28 being interposed optically between the intermediate image 38 and the two cameras 18 and 20. Objective 36 is preferably a conventional "C-mount" type lens.

  The image forming device 22 also comprises first 40 and second 42 image conveying means interposed optically between the separator cube 28 and the aspect and stress cameras 20 so as to be traversed respectively by the first 32 and second 34 separate beams and each carrying the intermediate image 38 to the corresponding camera. The aspect and strain images 26 correspond to the intermediate image 38 transported respectively to the aspect and stress cameras 18.

  The image transport means 40 and 42 are conventional optical devices comprising lenses and are intended to carry an optical image from one point to another, in this case transporting the intermediate image 38 of the article in question. glass 12 to photodetector cells of the aspect and stress cameras 20, these photodetector cells being disposed at the location where the images of aspect 24 and stress 26 are formed.

  The two aspect and stress cameras 20 are synchronized so that they can provide images of the glass article 12 at the same time.

  Thanks to the use of the single lens 36 and the image transport means 40 and 42, it is ensured that the aspect and stress images 26 received by the aspect and strain cameras 20 are identical, ie obtained from the same objective 36.

  An aspect image 24 received by the aspect camera 18 is shown schematically in FIG. 2. This aspect image 24 shows an outline 44 of the glass article 12 as well as radial ribs 46 forming non-defective reliefs. . It may, if necessary, also reveal defects such as those usually detected by the aspect control.

  A constraint image 26 received by the constraint camera 20 is shown schematically in FIG. 4. This constraint image 26, showing the same article as the aspect image 18 of FIG. 2, can, if necessary, reveal defects. such as those usually detected by the stress check.

  The device 10 for controlling the glass article 12 comprises means 50 for analyzing the images provided by the cameras 18 of appearance and of constraint 20. These analysis means 50 comprise in particular a computer, connected to the cameras of aspect 18 and constraint 20, and conventional image processing software.

  In order to analyze more particularly the aspect image 24, the analysis means 50 comprise conventional means 52 for determining the outline 44 of the glass article 12 visible on the aspect image 24.

  The analysis means 50 make it possible in particular: to define, from the contour 44, a mask 54 as represented in FIG. 3, to define from the mask 54 an area of the aspect image 24 to be analyzed substantially corresponding to at the part of this aspect image 24 which is complementary to the mask 54, to analyze the area in order to detect any defects.

  In order to form the constraint image 26, the device 10 for controlling an article comprises an upstream polarizer 56 optically interposed between the light box 16 and the glass article 12. Furthermore, the device 22 for forming an article images comprises a downstream polarizer 60 interposed optically between the constraint camera 20 and the respective image conveying means 42. In the example described, the polarizer 60 is integral with the image transport means 42.

  The downstream polarizer 60 is movable relative to the upstream polarizer 56 which is fixed so as to be able to orient these polarizers 56 and 60 between them so that their polarization directions are substantially orthogonal.

  To adjust the relative position of the moving polarizer 60 relative to the fixed polarizer 56, the image forming device 22 is provided with a device 62 for adjusting the angular position of the image conveying means 42 (and thus the polarizer 60) around an optical axis of these means 42. The adjustment device 62 comprises for example an operating wheel coupled to the image transmission means 42 by gears.

  It will be noted that the arrangement of the polarizer 60 on the means 42 for transporting rotating images makes it possible to adjust the orientation of this polarizer by means of space-saving means.

  When a flawless glass article 12 capable of influencing the polarization of the light is placed in front of the lens 36, the stress image 26 is dark (absence of light) because the polarization directions of the two polarizers 56 and 60 are orthogonal.

  On the other hand, when a glass article 12 having at least one defect capable of influencing the polarization of the light is placed in front of the objective 36, the stress image 26 has, on a dark background, a clear spot ( presence of light) corresponding to the defect in that a stress-generating defect in the lens polarizes light from the upstream polarizer 56 and passes through the glass.

  It will be noted that the constraint image 26 may comprise, where appropriate, clear spots corresponding to false alarms. Indeed, in the case of a glass bottle, the light from the light box 16 can be reflected against the vertical walls of the bottle and thus show false alarms in the constraint image 26.

  Faults 64 and false alarms 66 (light spots) are shown in Figure 4 by black dots on a white background (colors inverted with respect to a real image).

  Generally, the false alarms are located outside the contour 44 of the article. However, it is not possible to determine the outline of the glass article 12 from the constraint image 26 since it is dark, with the exception of any light spots corresponding to defects likely to influence polarization of light or false alarms.

  On the other hand, since the strain 26 and aspect 24 images obtained by the device 22 are identical (obtained by a common objective 36), the contour 44 determined from the aspect image 24 can be used for analyze the constraint image 26.

  For this purpose, the analysis means 50 comprise conventional means 68 for analyzing the constraint image 26. These analysis means 68 make it possible in particular to define from the mask 54 an area of the constraint image 26 to be analyzed substantially corresponding to the portion of this constraint image 26 which is complementary to the mask 54 (this mask has been defined from the contour 44), as shown in FIG. 5 (inverted colors as in FIGS. 2 and 4 ). The area to be analyzed comprises only possible light spots corresponding to defects 64 likely to influence the polarization of the light. The light spots corresponding to false alarms 66 do not appear in the zone to be analyzed substantially corresponding to the portion of the constraint image 26 complementary to the mask 54.

  It will be noted that the light quantity requirements of the cameras 24 and 24 are different. Thus, the aspect camera does not need as much light as the constraint camera 26.

  As a result, the image forming device 22 preferably includes a diaphragm 70 optically interposed between the aspect camera 18 and the respective image conveying means 40.

  The diaphragm 70 has a first portion which is movable relative to a second portion of this diaphragm 70 which is fixed. In the example described, the first part of the diaphragm 70 is integral with the image transport means 40.

  To adjust the relative position of the two parts of the diaphragm 70, the image forming device 22 is provided with a device 72 for adjusting the angular position of the image conveying means 40 (and therefore of the first part of the diaphragm 70) about an optical axis of these means 40. The adjustment device 72 comprises for example a knob for adjusting the aperture of the diaphragm 70 coupled to the means 40 for image transport by gears.

  It should be noted that the arrangement of the first portion of the diaphragm 70 on the rotating image conveying means 40 makes it possible to adjust the opening of this diaphragm 70 by means of space-saving means.

  The image forming device 22 also preferably comprises a field lens 74 interposed optically between the objective lens 36 and the splitter cube 28 in order to increase the collected luminosity and to compensate for certain optical characteristics of the image transport means 40 and 42, including their magnification.

  Among the advantages of the invention, it will be noted that the image forming device 22 of the invention makes it possible to optimize the reliability of the control of the glass articles 12 because the appearance and stress images are obtained by the same goal.

  The invention is not limited to the embodiment previously described.

  In particular, the diaphragm 70 and the field lens 74 are optional.

Claims (15)

CLAIMS,
  1. Device (22) for forming first (24) and second (26) images of the same article (12), of the type comprising means (28) for separating an optical beam (30) emitted by the article (12) in first (32) and second (34) separated beams transmitted to first (18) and second (20) image receivers, characterized in that it comprises a lens (36) forming an intermediate image (38) of the article (12), the separating means (28) being interposed optically between the intermediate image (28) and the two image receptors (18, 20), the first (40) and second ( 42) image transport means being interposed optically between the separation means (28) and the first (18) and second (20) image receptors so as to be traversed respectively by the first (32) and second (32) ) separate beams and each transporting the intermediate image (38) to the corresponding image receiver (18, 20).
  2. Device (22) for forming first (24) and second (26) images of the same article (12) according to claim 1, comprising a diaphragm (70) interposed optically between one of the image receptors (18) and its respective image conveying means (40).
  3. A device (22) for forming first (24) and second (26) images of the same article (12) according to claim 2, wherein the diaphragm (70) has a portion secured to one of the means ( 40) of image transport.
  4. Device (22) for forming first (24) and second (26) images of the same article (12) according to any one of claims 1 to 3, comprising a first polarizer (60) interposed optically between one of image receivers (20) and its respective image conveying means (42).
  5. Device (22) for forming first (24) and second (26) images of the same article (12) according to claim 4, wherein the first polarizer (60) is integral with one of the means (42) image transport.
  6. A first (24) and second (26) image forming device (22) of the same article (12) according to any one of claims 1 to 5, wherein the separating means (28) comprises a separator cube (28).
  7. Device (22) for forming first (24) and second (26) images of the same article (12) according to any one of claims 1 to 6, comprising a field lens (74) interposed optically between the objective (36) and the separation means (28) to increase the collected brightness.
  8. Device (10) for controlling an article (12), of the type comprising acquisition means (18, 20) of first (24) and second images (26) of the article (12), said images of appearance (18) and stress (20) respectively, and means (52) for determining a contour (44) of the article (12) from the first image (24), characterized in that it comprises means (68) for analyzing the second image (26) using the contour (44) determined from the first image (24).
  An apparatus (10) for controlling an article (12) according to claim 8, wherein the acquisition means (18, 20) of the first (24) and second (26) images comprise first (18) and second (20) acquisition devices respectively forming the first (18) and second (20) image receivers of an image forming device (22) according to any one of claims 1 to 8.
  Device (10) for controlling an article (12) according to claim 9, wherein the first (18) and second (20) acquisition devices are cameras (18, 20), for example of the CCD type or CMOS.
  Apparatus (10) for controlling an article (12) according to claim 10, wherein the cameras (18, 20) are synchronous.
  A device (10) for controlling an article (12) according to any one of claims 8 to 11, comprising a light box (16) for illuminating a transparent article (12) placed between the light box ( 16) and the objective (36).
  Apparatus (10) for controlling an article (12) according to claim 12, wherein the acquisition means (18, 20) of the first (24) and second (26) images comprise first (18) and second (20) acquisition devices respectively forming the first (18) and second (20) image receivers of an image forming device (22) according to claim 5, the control device (10) comprising a second polarizer (56), optically interposed between the light box (16) and the article (12), the first (60) and second (56) polarizers being arranged so that their polarization directions are substantially orthogonal.
  14. A method of controlling an article (12) of the type in which first (24) and second (26) images of the article are produced, said aspect (24) and constraint (26) images, respectively. , and a contour (44) of the article (12) is determined from the first image (24), characterized by defining an analysis zone of the second image from the contour (44).
  15. The method of controlling an article (12) according to claim 14, wherein the first (24) and second (26) images are produced by means of the same objective (36).
FR0402751A 2004-03-17 2004-03-17 Device for forming first and second images of the same article, device for controlling an article and method for controlling an article Expired - Fee Related FR2867857B1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551627A (en) * 1983-08-01 1985-11-05 Kirin Beer Kabushiki Kaisha Methods and apparatus for detecting residual liquid in containers
US4943713A (en) * 1987-11-27 1990-07-24 Hajime Industries Ltd. Bottle bottom inspection apparatus
US5216239A (en) * 1991-08-20 1993-06-01 Hajime Industries Ltd. Residual fluid detection apparatus for detecting fluid at the bottom of a bottle using both IR and visible light
EP0628807A1 (en) * 1993-06-08 1994-12-14 Emhart Glass Machinery Investments Inc. Machine for inspecting the bottom of containers
WO1997046329A1 (en) * 1996-06-04 1997-12-11 Inex, Inc. Doing Business As Inex Vision Systems, Inc. System and method for stress detection in a molded container
EP0957355A2 (en) * 1998-05-14 1999-11-17 Owens-Brockway Glass Container Inc. Optical inspection of transparent containers using two cameras and a single light source
EP1217358A1 (en) * 2000-11-24 2002-06-26 Scan Technology Co., Ltd. Impurities inspection system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551627A (en) * 1983-08-01 1985-11-05 Kirin Beer Kabushiki Kaisha Methods and apparatus for detecting residual liquid in containers
US4943713A (en) * 1987-11-27 1990-07-24 Hajime Industries Ltd. Bottle bottom inspection apparatus
US5216239A (en) * 1991-08-20 1993-06-01 Hajime Industries Ltd. Residual fluid detection apparatus for detecting fluid at the bottom of a bottle using both IR and visible light
EP0628807A1 (en) * 1993-06-08 1994-12-14 Emhart Glass Machinery Investments Inc. Machine for inspecting the bottom of containers
WO1997046329A1 (en) * 1996-06-04 1997-12-11 Inex, Inc. Doing Business As Inex Vision Systems, Inc. System and method for stress detection in a molded container
EP0957355A2 (en) * 1998-05-14 1999-11-17 Owens-Brockway Glass Container Inc. Optical inspection of transparent containers using two cameras and a single light source
EP1217358A1 (en) * 2000-11-24 2002-06-26 Scan Technology Co., Ltd. Impurities inspection system

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