EP3570256A1 - Procédé de vérification et dispositif de lecture pour un marquage de sécurité - Google Patents

Procédé de vérification et dispositif de lecture pour un marquage de sécurité Download PDF

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Publication number
EP3570256A1
EP3570256A1 EP19174501.7A EP19174501A EP3570256A1 EP 3570256 A1 EP3570256 A1 EP 3570256A1 EP 19174501 A EP19174501 A EP 19174501A EP 3570256 A1 EP3570256 A1 EP 3570256A1
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EP
European Patent Office
Prior art keywords
wavelength range
field
light
security
contrast
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.)
Pending
Application number
EP19174501.7A
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German (de)
English (en)
Inventor
Robert Jansen
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.)
Dpg Deutsche Pfandsystem GmbH
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Dpg Deutsche Pfandsystem GmbH
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Filing date
Publication date
Application filed by Dpg Deutsche Pfandsystem GmbH filed Critical Dpg Deutsche Pfandsystem GmbH
Publication of EP3570256A1 publication Critical patent/EP3570256A1/fr
Pending legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/2008—Testing patterns thereon using pre-processing, e.g. de-blurring, averaging, normalisation or rotation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties

Definitions

  • the application relates to a read-out unit and a test method for reading out and checking security markings, in particular security markings on packaging, as used, for example, in the context of a deposit system.
  • Security markings are used in many ways to complicate counterfeiting and to provide the best possible guarantee for the authenticity of a certificate, a product, a banknote or the like. Security-tagged products are used because the deposit value is typically higher than the value of the package itself.
  • an outer shell of the packaging or a label or a banderole of the packaging which may be made of plastic, sheet metal or cardboard, for example, a security mark having a plurality of juxtaposed fields having different reflective properties.
  • One of these fields is, for example, a contrast field with a comparatively high reflectivity in a broad wavelength range which includes, for example, visible and infrared light.
  • a second of these fields is a dark field which has low reflectivity in the broad wavelength range compared to the contrast field.
  • a third field is a safety field that has different reflection properties in at least one known wavelength range, as in another known wavelength range.
  • the security field may have a low reflectivity in a first, for example, visible wavelength range of the light. In a second other, visible or invisible wavelength range of the light, the safety field, however, has a higher reflectivity - or vice versa.
  • the reflectivity of the respective field for a particular wavelength depends on the color with which the respective field is printed on a respective substrate.
  • the color with which the contrast field is printed or the contrast fields printed is a broadband reflective color
  • the color with which the dark field is printed or the dark fields printed is a broadband absorbing color.
  • the contrast field can also be formed by the background itself, if this is even broadband reflective.
  • the color with which the security field is printed or the security fields are printed has a higher absorption in the first wavelength range than in the second wavelength range. Accordingly, the color with which the security field is printed or the security fields printed has a higher reflectivity or a higher transparency or both in the second wavelength range. If the color with which the security field is printed or the security fields printed has a higher reflectivity in the second wavelength range than in the first wavelength range, the intensity of the reflected light in the second wavelength range is always greater than the intensity of the reflected light in the first wavelength range.
  • the intensity of the reflected light in the second wavelength range is greater than the intensity of the reflected light in the second wavelength range first wavelength range, if the background under the color with which the security field is printed, has a sufficiently high reflectivity in this second wavelength range. If the color with which the security field is printed or the security fields are printed already has a high reflectivity in the second wavelength range, it depends on the reflectivity of the background below the color with which the security field is printed or the security fields are printed. less or not at all.
  • One way to test a security marking of the type described is to illuminate the security marking on the one hand with light in the first wavelength range and on the other with light in the second wavelength range.
  • a safety field which is printed with a color which strongly absorbs visible light and is transparent to infrared light, so that the reflectivity of the safety field in the infrared wavelength range from the background under the color with which the security field is printed is determined ,
  • the background of the safety field is white, so that the safety field under infrared light also appears just as white as the background and the surroundings of the safety field, because the color with which the safety field is printed is transparent to infrared light and therefore invisible, so that under infrared light the background is visible under the color with which the security field is printed.
  • Another test method is to determine the extent to which the safety field reflects more strongly in the second wavelength range than in the first wavelength range. This method has the advantage that the check of the safety field need not refer to the environment of the safety field or any reference field that has the same color as the background on which the color for the safety field is printed.
  • the other test method has the disadvantage that the intensity of the reflected light from the safety field on the intensity of the illumination - hereinafter also called illuminance - depends.
  • the illuminance in turn, depends not only on an intensity of a light source, but e.g. also from the distance that the safety field to be tested from the light source, or from the angle at which the light from the light source strikes the safety field.
  • the invention has for its object to improve a test method on the type of the other test method or to provide means for an improved test method.
  • this object is achieved by a test method in which the intensity of the light reflected from the contrast field when illuminated with light in the first wavelength range (in which the safety field is strongly absorbed) is used to correct a difference value that is different from the difference two different Intensities of the light reflected from the security field at the two different wavelength ranges light is derived.
  • the intensities of the light reflected by the security field and by the contrast field in two different wavelength ranges are detected and evaluated. From the two different intensities of the light reflected from the safety field at the two different wavelength ranges, a difference value is derived. From the intensity of the light reflected from the contrast field when illuminated with light in the first wavelength range, a correction value is derived with which the difference value determined from the intensities of the light reflected from the safety field is corrected.
  • the test method is preferably carried out by a readout unit which is designed to carry out the test method.
  • the invention includes the recognition that the intensity of the light reflected from the contrast field when illuminated with light in the first wavelength range in a light source whose intensity is substantially constant depends primarily on the distance and angle the security marker has to the light source ,
  • the difference value is formed such that it also depends on the intensities of the light reflected by at least one dark field.
  • a difference between the intensities of the light reflected by the safety field and by the dark field can first be formed for each wavelength range. This can be done by forming a first gray level s i for a respective wavelength range, which represents the intensity of the light reflected by the dark field in the respective wavelength range. This first gray value s i can be subtracted from a second gray value d i , which represents the intensity of the light reflected by the safety field in the same wavelength range.
  • a contrast value can be formed for each of the two wavelength ranges. Subsequently, the difference between the two contrast values thus formed can be formed.
  • the difference between a gray value d i of the security field and a gray value s i of the dark field for a respective wavelength range i can be understood as a contrast value (d i -s i ) representing the contrast of the security field to the dark field.
  • the contrast value is greater the more the safety field reflects light in the first or the second wavelength range, ie the greater the difference in brightness between the dark field and the safety field when illuminated in the respective wavelength range. Because the security box in is weaker reflected in the first wavelength range than in the second wavelength range, the contrast value for the second wavelength range is greater than for the first wavelength range.
  • the difference value is formed as a difference ((d 1 -s 1 ) - (d 2 -s 2 )) of two contrast values, the difference value is a measure of how much greater the reflectivity of the safety field in the second wavelength range compared to the reflectivity in the first Wavelength range is.
  • each contrast value is normalized by means of a maximum contrast value which represents the difference between a gray value w i of the contrast field and a gray value d i of the dark field for a respective wavelength range.
  • the normalization can be effected by dividing the respective contrast value by the associated maximum contrast value so that a normalized contrast value is formed for each of the two wavelength ranges.
  • the difference value is preferably the difference between the normalized contrast values.
  • the product of the correction factor k and the gray value w 1 of the contrast field in the case of light in the first wavelength range form the previously mentioned correction value.
  • the gray value w 1 of the contrast field in the first wavelength range can also be used as a correction value.
  • the difference of the contrast values ( d 2 -s 2 ) - ( d 1 -s 1 ) is thus normalized with a value - namely the gray value w 1 of the contrast field, which depends on the distance of the security marking to the respective light source.
  • the correction factor k is preferably a constant which has been previously determined for a respective readout unit or a respective readout unit type and stored in the respective readout unit.
  • the security marking is checked and in particular the safety field is tested not only in two different wavelength ranges, but in several different wavelength ranges, so that the spectral properties of the fields of the security marking - and in particular the spectral properties of the security field and the color or the colors with which this is printed - can be examined in more differentiated ways and a forgery is even more difficult.
  • the inventive concept is further embodied by a security marker read-out unit on a package of the type described above.
  • the readout unit is designed to detect an intensity of the light reflected from the security field of the security marking in at least two different wavelength ranges, of which a first wavelength range is a wavelength range in which the security field strongly absorbs, while the other, second wavelength range is a wavelength range, in which the security field reflects comparatively stronger.
  • the readout unit preferably has an image acquisition module with an area sensor with photosensitive sensor elements, which are preferably arranged like a matrix.
  • the area sensor image acquisition module is for capturing an image imaged on the sensor in two dimensions.
  • an optic which images the image of a respective security marking as sharply as possible on the surface sensor.
  • the photosensitive sensor elements are photosensitive both in the first wavelength range of the light and in the second wavelength range and thus capable of displaying images of the security mark and in particular of the security field when illuminated with light in the first wavelength range as well as when illuminated with light in the second wavelength range Record wavelength range. Whether the image of the security marking is recorded for light in the first wavelength range or for light in the second wavelength range thus depends in this embodiment on the light with which the packaging is illuminated with the security mark.
  • the readout unit has an illumination module which is designed and arranged to illuminate a viewing region of the image acquisition module simultaneously or alternately with light in the first wavelength range and with light in the second wavelength range.
  • illumination module which is designed and arranged to illuminate a viewing region of the image acquisition module simultaneously or alternately with light in the first wavelength range and with light in the second wavelength range.
  • an illumination module which simultaneously illuminates the viewing area of the image acquisition module with light in the first wavelength range and with light in the second wavelength range, eg. broadband - illuminates.
  • alternately light filters may be switched in front of the image sensing module, one of which is transparent to light in the first wavelength range and another is transparent to light in the second wavelength range and blocks the other wavelength range.
  • two illumination modules one for light in the first wavelength range and one for light in the second wavelength range, which are switched on alternately.
  • two image capturing units can be provided which, on the one hand, due to the properties of their area sensor or due to corresponding filters, capture only images with light in the first wavelength range and only images with light in the second wavelength range on the other hand.
  • a lighting module that simultaneously emits both light in the first wavelength range and light in the second wavelength range and an image sensing module that is sensitive to both light in the first wavelength range and light in the second wavelength range, without that additional filters are needed.
  • the image of the security marking ultimately acquired in this variant would be dark in the area of the dark fields, since the dark fields absorb both light in the first wavelength range and light in the second wavelength range.
  • the contrast field would be bright because the contrast field has high reflectivity for both light in the first wavelength range and light in the second wavelength range.
  • the security field would have an average gray value, since the security field absorbs light in the first wavelength range but has a relatively high reflectivity for light in the second wavelength range, which is higher in any case than the reflectivity of the dark fields for light in the second wavelength range , Even if the security field had the same high reflectivity for light in the second wavelength range as the contrast field, the latter embodiment will illuminate and reflect the security mark with both light in the first wavelength range and light in the second wavelength range Broadband is detected, come to the fact that the security field does not appear quite bright, but gray, since it absorbs in any case, light in the first wavelength range.
  • the illumination module preferably has light sources which are narrow-band, so that the spectral bandwidth (from the half-value of the maximum to the half-value each of the maximum (FWHM: full with at half maximum)) is less than 60 nm in each case.
  • the mean wavelength between these two half-value wavelengths is referred to in the context of this description as the central wavelength of the respective wavelength range.
  • the illumination module is preferably designed such that it emits light in the visible wavelength range in two partial wavelength ranges whose central wavelengths are preferably more than 200 nm apart.
  • the intensity of the shorter wavelength of these two wavelength ranges is preferably between 25 and 40% of the total intensity of the visible light emitted in the two partial wavelength ranges.
  • Particularly suitable light sources are light-emitting diodes. These have short response times and narrow bandwidths.
  • the illumination module is preferably designed such that the viewing area of the detection module in which a scoring package is located is illuminated so uniformly that the intensity difference over the viewing area is at most 25%.
  • the illumination module is preferably arranged such that the illumination angle related to a surface normal of the security marking to be illuminated is between 20 ° and 45 °.
  • the image acquisition module with associated optics for imaging a security mark to be evaluated on the area sensor is preferably designed such that 1 mm 2 of the security marking is detected by at least four entire sensor elements (pixels).
  • the readout unit preferably comprises an evaluation unit, which is connected to the image acquisition module and which is designed to detect average gray values for at least one contrast field, at least one dark field and the security field, preferably separately for light in the first wavelength range and for light in the second wavelength range.
  • a valuation unit connected to the evaluation unit is designed to carry out an evaluation of the respectively detected security marking on the basis of the gray values of the security field recorded for the two different wavelength ranges. If the evaluation of the gray values by the valuation unit shows that, in particular, the gray values in the region of the image of the security field when illuminated with light in the second wavelength range deviate by a predefined amount from the gray values when illuminated with light in the first wavelength range, the evaluation of the security marking is in order. Otherwise, a rating is not OK.
  • FIG. 1 shows by way of example a package 10 in the form of a box with a security mark 12.
  • the security marker 12 serves to label the package 10 as a package for which a purchase is payable by a consumer, which the consumer receives upon return of the package.
  • the security marking is designed in such a way that it is not easily possible to provide the security marking with packaging for which no deposit has been paid. Since the deposit value is greater than the packaging value, the person who takes back the packaging and pays the deposit would be damaged in the case of packaging with a fake security mark.
  • FIG. 2 shows the essential features of the security marker 12, namely a comparatively highly reflective contrast field 14, which encloses a security field 16 and a signal field 18.
  • the contrast field 14 is highly reflective in a broad wavelength range, in particular in the visible wavelength range of the light and in the transition to the infrared wavelength range.
  • the safety field 16 has the property that in a first, preferably visible wavelength range of the light, it is weakly reflecting, that is to say strongly absorbing and therefore appears dark.
  • the security field 16 is highly reflective, for example just as highly reflective as the contrast field 14. This characteristic of different reflectivity at different wavelengths is obtained by the security field 16 in that the color with which the security field 16 is printed in the second wavelength range has a lower absorption than in the first wavelength range.
  • the safety field 16 when viewing the package 10 in the first wavelength range, e.g. In normal daylight, the safety field 16 can be clearly seen as a dark field against a light background, while the security field 16 is weaker to see when viewed in the second wavelength range, for example with the aid of a corresponding camera, since the security field 16 in the second wavelength range Has reflectivity similar to that of the contrast field 14.
  • the reflectivity of the respective field for a respective wavelength - and thus the intensity with which light is reflected in a respective wavelength range - depends on the Color with which the respective field is printed on a respective substrate.
  • the color with which the contrast field 14 is printed or the contrast fields printed is a broadband reflective color while the color with which the dark fields 20 and 22 are printed is a broadband absorbing color.
  • the contrast field 14 can also be formed by the background itself, if this is itself broadband reflective, so that the contrast field 14 does not necessarily have to be printed.
  • the color with which the security panel 16 is printed has a higher absorption in the first wavelength range than in the second wavelength range. Accordingly, the color with which the security panel 16 is printed has a higher reflectivity or a higher transparency or both in the second wavelength range than in the first wavelength range.
  • the intensity of the reflected light in the second wavelength range is in any case greater than the intensity of the reflected light in the first wavelength range . If the color with which the security field 16 is printed has a higher transparency in the second wavelength range than in the first wavelength range, then the intensity of the reflected light in the second wavelength range is greater than the intensity of the reflected light in the first wavelength range, if the background under the color with which the security panel 16 is printed has a sufficiently high reflectivity in this second wavelength range. If the color with which the security field 16 is printed already has a high reflectivity in the second wavelength range, the reflectivity of the background below the color with which the security field 16 is printed is less or not at all.
  • the substrate under the color with which the security field 16 is printed has a reflectivity which deviates from the reflectivity of the contrast field 14.
  • the safety field 16 can be printed with two colors, namely first with a first color with reflection properties that differ from those of the contrast field 14, and then with a second color, so that the second color covers the first color.
  • the second color with which the security field 16 is printed is then that color which, as described above, has a higher reflectivity and / or transparency in the second wavelength range than in the first wavelength range.
  • the safety panel 16 has an asymmetrical shape, so that its orientation with respect to the rest of the security mark is clearly visible.
  • a signal field 18 which, depending on the nature of the packaging, is either highly absorbent (as in FIG. 4) in a wide wavelength range including visible and infrared light FIG. 2 shown) or highly reflective. In the latter case - highly reflective signal field 18 - the signal field 18 has the same color as the background 14 and is thus practically absent, but determined solely by the abstract definition of its intended location. In the embodiment according to FIG. 2 the signal field 18 is shown in strongly absorbing color, that is weakly reflecting and therefore dark.
  • the signal field 18 serves to signal to a device for reading out the security marking whether and, if appropriate, which stored parameters are to be taken into account when checking the security marking. Parameters may e.g. be stored correction factors.
  • the security marker 12' preferably has further fields, namely dark fields once in the form of corner marks 20 and on the other in the form of orientation marks 22.
  • the dark fields 20 and 22 have the property of being strongly absorbing both in the first wavelength range and in the second wavelength range, that is to say they are weakly reflective and thus appear dark.
  • one or more of the dark fields - similar to the security field - be printed with two colors, namely first with a first color with reflection properties that differ from those of the contrast field 14, and then with a second color, so that the second color covers the first color, wherein the second color in the second wavelength range has a higher reflectivity and / or transparency, as in the first wavelength range.
  • the security against counterfeiting can be further increased.
  • at least one dark field is broadband absorbing and both in appears dark in the first wavelength range as well as in the second wavelength range.
  • the corner marks 20 are in the shape of right-angled isosceles triangles. This form is particularly suitable because such forms practically do not occur in the rest of the packaging imprint.
  • the catheters of the respective isosceles triangle 20 run parallel to the edges of the security marking 12 '. The hypotenuses of the corner marks 20 are thus turned inward with respect to the security mark 12 '.
  • the orientation marks 22 act as corner markings for finding two further corners of the overall quadrangular security mark 12 '.
  • they include between them the signal field 18, so that it is easy to find even if it has the same color as the background 14, as it is exemplified in FIG. 3 is shown.
  • Both the corner markings 20 and the orientation marks 22 may also have shapes other than those illustrated in the exemplary embodiment and be composed of several faces, for example, so that information can be encoded with the corner marks 20 and / or orientation marks 22, similar to the signal field 18 happens.
  • FIG. 4 basically shows the same security mark 12 "as FIG. 3 ,
  • the only difference between the security marker 12 "off FIG. 4 opposite the security marker 12 ' FIG. 3 is that the security field 18 at the security marker 12 "off FIG. 4 is slightly reflective, that is dark, and thus has the same color as the orientation marks 22 and the corner marks 20, while the security field 18 'of the security marker 12' off FIG. 3 is highly reflective and thus has the same color as the contrast field 14.
  • FIG. 5 shows a variant of a security marker 12 '"with a signal field 18", which is divided into a total of 8 partial signal fields, which are either strong or weakly reflective.
  • the eight subfields can thus play an 8-bit (1-byte) code.
  • the signal field 18 "outputs the byte 10100110 or 01011001, depending on whether a strong or a weak reflectivity is assigned to the bit value 1.
  • the read-out device 30, which may be part of a reverse vending machine for beverage packaging, for example, has on the one hand a transport device 32 with which a package 10 'can be positioned in front of a readout unit 34 so that it is within the field of view of the image capture unit 36 of the readout unit 34.
  • the field of view is in FIG. 5 indicated by dashed oblique lines.
  • a lighting module For illuminating the viewing area, a lighting module is provided which has two lighting units 38.1 and 38.2.
  • the illumination direction and thus the angle at which the illumination falls on a package 10 to be read are indicated by dotted arrows.
  • the illumination angle should be to the surface normal of the package 10 in an angular range between 20 ° and 45 °.
  • the lighting units 38.1 and 38.2 of the lighting module are arranged and aligned accordingly.
  • the lighting units 38.1 and 38.2 have a plurality of light-emitting diodes (LED) as light sources.
  • the illumination unit 38.1 is designed to illuminate the package 10 with light intensity of the reflected light in the second wavelength range, while the illumination unit 38.2 illuminates the packaging unit 10 with light intensity of the reflected light in the first wavelength range.
  • the lighting unit 38.2 has two types of light emitting diodes, namely, a first type of light emitting diodes emitting blue visible light and a second type of light emitting diodes emitting red, visible light.
  • the visible light emitted by the illumination unit 38.2 thus consists of two wavelength ranges, each with a central wavelength in the blue region of the visible spectrum and a central wavelength in the red region of the visible spectrum.
  • the half-value bandwidth of the two The partial wavelength ranges emitted by the visible light illumination module 38.2 are each less than 50 nm.
  • the lighting module and its lighting units 38.1 and 38.2 can thus set targeted lighting scenarios.
  • the lighting units 38.1 and 38.2 are operated alternately, so that the package 10 is illuminated either only with light in the second wavelength range from the lighting unit 38.1 or with light in the first wavelength range of the lighting unit 38.2.
  • the image acquisition module 36 has an area sensor 40 and an optical system 42 which images an image of the surface of the package 10 sharply on a surface of the area sensor 40.
  • the surface of the surface sensor 40 is formed by a plurality of photosensitive sensor elements. These are preferably arranged like a matrix.
  • the sensor elements of the surface sensor 40 and the optics 42 are designed so that a square millimeter of the surface of the package 10 is imaged onto a partial surface of the surface sensor 40 such that the partial surface contains at least four complete sensor elements.
  • the magnification with which the optical system 42 images an image of the surface of the package 10 on the surface of the area sensor 40 depends on the size that the sensor elements occupy on the surface of the area sensor 40 and the distance between the sensor elements. It goes without saying that the optic 42 is designed so that it images the surface of the package 10 sharply on the surface sensor 40 in the region of a depth of field required by varying packaging diameters.
  • the sensor elements of the surface sensor 40 are broad-band photosensitive, that is at least in the partial wavelength ranges of the light, which are emitted by the lighting units 38.1 and 38.2 simultaneously or alternately.
  • the output value provided by a respective sensor element of the area sensor 40 which is also referred to here as a gray value, is greater, the greater the total intensity of the light which strikes the respective sensor element.
  • the total intensity of the light which strikes the respective sensor element is composed of the partial intensities of the light in the different wavelength ranges, from which the light impinging on a respective sensor element is composed.
  • This total intensity is the intensity of the light detected by the sensor element in the second wavelength range when the package is illuminated exclusively by the illumination unit 38.1 with light in the second wavelength range.
  • the output value of a respective sensor element corresponds to the respective intensity in the first wavelength range of the light when the packaging surface is illuminated exclusively by the illumination unit 38.2 with light in the first wavelength range.
  • the surface of the packaging 10 is illuminated both by the illumination unit 38.1 and by the illumination unit 38.2 simultaneously with light in the second wavelength range as well as with light in the first wavelength range, the light intensity detected by a respective sensor element - and thus the output gray value - from the sum of the intensity with which a respective surface element assigned to the sensor element via the image reflects light in the first wavelength range and in the second wavelength range.
  • sensor elements which detect, for example, a part of the contrast field 14 of the security marking 12 always detect a large brightness value and thus deliver a large output value - and thus a high gray value w i .
  • sensor elements which detect part of an orientation mark 22 or corner mark 20 will always detect a low brightness value and thus also provide a low output value and gray value s i , irrespective of whether the illumination is performed with light in the first wavelength range or with light in takes place in the second wavelength range.
  • the gray value d i which is supplied by a sensor element onto which a part of the safety field 16 is imaged, depends on the type of illumination.
  • the intensity reflected by the security patch 16 is low, thus forming part of the security field 16 detecting sensor element provides only a low gray value d 1 .
  • the reflected from the safety field intensity of the light - depending on the background - significantly higher and, for example, the intensity of the contrast field 14 reflect.
  • a sensor element on which a part of the security field is imaged provides a high gray value d 2 .
  • the gray value provided by a sensor element detecting the security field is a mean gray value.
  • the processed gray values (output values of the sensor elements of the area sensor 40) are fed to an evaluation unit 46, in which on the one hand a detection of the different areas of the security marking with the aid of itself known pattern recognition process takes place.
  • This image capture of the image of the security marking also serves to determine the location of the signal field 18 in order to be able to read out its intensity.
  • the evaluation unit 46 switches on a different reference threshold for the evaluation of the intensity of the light reflected by the safety field 16 in the second wavelength range.
  • the intensity values supplied by the various fields of the security marking for the purpose of evaluating the respective security marking are compared with respective reference thresholds.
  • This evaluation is performed by a valuation unit, which is part of the evaluation unit 46 and therefore in Fig. 5 not shown in detail.
  • the evaluation of the intensity values represented by corresponding gray values d 2 which are to be assigned to the safety field 16 when illuminated with light in the second wavelength range, takes place with reference to the gray values d 1 - and thus the intensity values - that of the safety field 16 when illuminated with light in the first wavelength range are assigned.
  • packaging is accepted and the disbursement of the deposit is initiated or not.
  • the evaluation by the evaluation unit 46 takes place according to the following procedure: First, therefore, the intensities of the light reflected by the safety field in two different wavelength ranges are detected in the form of gray values d 1 , d 2 . In addition, the intensities of the light reflected by the contrast field in the first wavelength range are detected in the form of a possibly averaged gray value w 1 . From the two gray levels d 1 and d 2 representing the different intensities of the light reflected by the safety field in the two different wavelength ranges, a difference value is derived. From the gray value w 1 representing the intensity of the light reflected by the contrast field when illuminated with light in the first wavelength range, a correction value is derived with which the difference value determined from the intensities of the light reflected by the safety field is corrected.
  • the difference value is formed such that it also depends on the intensities of the light reflected by the dark field.
  • a difference between the intensities of the light reflected by the safety field and by the dark field can first be formed for each wavelength range. This can be done by forming a first gray level s i for a respective wavelength range, which represents the intensity of the light reflected by the dark field in the respective wavelength range. This first gray value s i can be subtracted from a second gray value d i , which represents the intensity of the light reflected by the safety field in the same wavelength range.
  • a contrast value can be formed for each of the two wavelength ranges. Subsequently, the difference between the two contrast values thus formed can be formed.
  • the difference between a gray value d i of the security field and a gray value s i of the dark field for a respective wavelength range i can be understood as a contrast value (d i -s i ) representing the contrast of the security field to the dark field.
  • the contrast value is greater the more the safety field reflects light in the first or the second wavelength range, ie the greater the difference in brightness between the dark field and the safety field when illuminated in the respective wavelength range. Because the security field in the first wavelength range is weaker than in the second wavelength range, the contrast value for the second wavelength range is greater than for the first wavelength range.
  • the difference value is formed as a difference ((d 1 -s 1 ) - (d 2 -s 2 )) of two contrast values, the difference value is a measure of how much greater the reflectivity of the safety field in the second wavelength range compared to the reflectivity in the first Wavelength range is.
  • each contrast value is normalized by means of a maximum contrast value representing the difference between a gray value w i of the contrast field and a gray value s i of the dark field for a respective wavelength range.
  • the normalization can be effected by dividing the respective contrast value by the associated maximum contrast value so that a normalized contrast value is formed for each of the two wavelength ranges.
  • the difference value is preferably the difference between the normalized contrast values.
  • the product of the correction factor k and the gray value w 1 of the contrast field in the case of light in the first wavelength range form the previously mentioned correction value.
  • the gray value w 1 of the contrast field in the first wavelength range can also be used as a correction value.
  • the difference of the contrast values ( d 2 -s 2 ) - ( d 1 -s 1 ) is thus normalized with a value - namely the gray value w 1 of the contrast field, which depends on the distance of the security marking to the respective light source.
  • the correction factor k is preferably a constant which has been previously determined for a respective readout unit or a respective readout unit type and stored in the respective readout unit.
  • the evaluation unit 46 is also connected to a control unit 48 which serves, for example, to control the lighting units 38.1 and 38.2 and which also controls the transport device 32, for example to rotate the package 10 by means of the transport device 32 so that the security marking on the surface of the Packaging 10 is located in the field of view of readout unit 34.
  • the image recognition by the evaluation unit 46 also serves this purpose.
  • the control unit also controls the reimbursement as well as the return of packaging.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
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  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
EP19174501.7A 2018-05-15 2019-05-14 Procédé de vérification et dispositif de lecture pour un marquage de sécurité Pending EP3570256A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3825140A1 (fr) * 2019-11-25 2021-05-26 Envipco Holding N.V. Indicateur de sécurité, procédé de détection d'un indicateur de sécurité et système de détection d'un indicateur de sécurité
WO2024155729A1 (fr) 2023-01-18 2024-07-25 Sun Chemical Corporation Système de marquage et de vérification de sécurité

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4319555A1 (de) 1993-06-13 1994-12-15 Tetra Pak Aps Gmbh Markierung in Form von Farbzeichen
DE10247252A1 (de) 2002-10-10 2004-04-22 Mrv Multi Reverse Vending Gmbh Sicherheitscode und Vorrichtung zum Sortieren und/oder Sammeln und Verfahren zum Betreiben einer derartigen Vorrichtung
DE102006011143A1 (de) 2005-11-04 2007-05-10 Mrv Multi Reverse Vending Gmbh Sicherheitsmarkierungssystem
EP1821096A2 (fr) * 2006-02-20 2007-08-22 DPG Deutsche Pfandsystem GmbH Emballage doté d'un signet et dispositif de sélection pour le signet
DE102013103527A1 (de) * 2013-04-09 2014-10-09 Bundesdruckerei Gmbh Bildaufnahmesystem zur Bildaufnahme von Merkmalen eines Identifikationsdokumentes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4319555A1 (de) 1993-06-13 1994-12-15 Tetra Pak Aps Gmbh Markierung in Form von Farbzeichen
DE10247252A1 (de) 2002-10-10 2004-04-22 Mrv Multi Reverse Vending Gmbh Sicherheitscode und Vorrichtung zum Sortieren und/oder Sammeln und Verfahren zum Betreiben einer derartigen Vorrichtung
DE102006011143A1 (de) 2005-11-04 2007-05-10 Mrv Multi Reverse Vending Gmbh Sicherheitsmarkierungssystem
EP1821096A2 (fr) * 2006-02-20 2007-08-22 DPG Deutsche Pfandsystem GmbH Emballage doté d'un signet et dispositif de sélection pour le signet
DE102013103527A1 (de) * 2013-04-09 2014-10-09 Bundesdruckerei Gmbh Bildaufnahmesystem zur Bildaufnahme von Merkmalen eines Identifikationsdokumentes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3825140A1 (fr) * 2019-11-25 2021-05-26 Envipco Holding N.V. Indicateur de sécurité, procédé de détection d'un indicateur de sécurité et système de détection d'un indicateur de sécurité
WO2024155729A1 (fr) 2023-01-18 2024-07-25 Sun Chemical Corporation Système de marquage et de vérification de sécurité

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