• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for inspecting a, in particular flat, article (1) comprising a texture (10) and a transparent plastic layer (11) with a relief-like profile over the texture (10) to determine whether these are precisely one above the other, a) the article (1) is illuminated with unpolarized light is irradiated on the article (1), b) wherein the article (1) from the opposite side by means of a recording unit (3) is recorded, the optical axis in the Brewster angle (ΘB) c) wherein with the recording unit (3) a first image (B1) is created with light having a polarization perpendicular to the plane of incidence, d) with the receiving unit (3) a second image (B2) of the object (1) with light is created with a polarization parallel to the plane of incidence.
    公开号:AT517150A1
    申请号:T50324/2015
    申请日:2015-04-23
    公开日:2016-11-15
    发明作者:Reinhold Dr Huber-Mörk；Johannes Ruisz；Daniel Dipl Ing Soukup
    申请人:Ait Austrian Inst Technology；
    IPC主号:
    专利说明:

    The invention relates to a method according to claim 1 and a receiving device according to claim 8. The invention is used commercially in the field of testing relief prints.
    Relief prints are used, for example, for wood imitations but also for other purposes. A relief print has the following features: a) a texture with a predetermined color gradient printed on it, and b) a transparent plastic layer with a relief-like course corresponding to the color gradient, which is arranged above the texture.
    In the production of relief prints, it sometimes comes to the problem that the texture and the plastic layer are not made accurately or are strongly shifted from each other. If the displacement exceeds a predetermined level or a predetermined threshold, this leads to visually unsightly effects, in particular a wood imitation can be very easily perceived as such.
    In the context of the invention, the term Brewster angle is used. This corresponds to an angle at which unpolarized light incident on the interface of two dielectric media only reflects the components polarized perpendicular to the plane of incidence. The reflected light is then linearly polarized.
    The object of the invention is to detect objects with shifted texture / relief plastic layer in order to be able to eliminate defective relief prints from the production process. The invention solves this problem in a test method having the features of patent claim 1.
    The invention provides that for inspection of a, in particular flat, object comprising - a texture with a printed predetermined color gradient, and - a transparent plastic layer with relief-like, the color gradient corresponding course, which is located above the texture, to determine whether the A) wherein the object is illuminated with unpolarized light which is radiated at the Brewster angle, with a maximum deviation of 10 °, on the object, b) wherein the object from the opposite side means a recording unit is recorded whose optical axis is at Brewster's angle, with a maximum deviation of +/- 10 °, to the surface of the object, and wherein the optical axis of the recording unit and direction of irradiation of the incident light lie in a plane, c) wherein with the recording unit a first image of the object we created d, wherein only light with a polarization perpendicular to the plane of incidence is used for recording, d) wherein the recording unit a second image of the object is created, wherein for recording only light with a polarization parallel to the plane of incidence is used, e) wherein the two images f) that the offset thus determined is compared with a predetermined threshold value and if the threshold is exceeded by the offset, it is determined that the texture and the Plastic layer does not fit over each other. The invention allows in this way a particularly simple detection of the accuracy of fit of prints and reliefs.
    A preferred aspect of the invention provides that a line sensor comprising a number of sensor pixels arranged in a row is used as the image recording unit, the line direction of the line sensor being parallel to the surface of the object, the object and the image recording unit being in a plane parallel to the surface of the object Subject and normal to the sensor line of the image pickup unit along a predetermined transport direction relative to each other are moved relative to be created with the image pickup unit images of a subject line of the object, the normal to
    Transport direction of the article stands, and that the first image and the second
    Image created by joining the line images or parts of the line images that show the object each recorded with the same polarization. This makes it possible for the entire picture to ensure compliance with the Brewster angle when recording. Errors that arise due to the non-exact compliance with the Brewster angle in peripheral areas, thus do not occur.
    For the same purpose, it may be provided that the object line of the object detected by the line sensor is illuminated homogeneously, in particular by means of a cell-shaped light source normal to the object
    Transport direction is facing the line sensor and emits light at Brewster angle on the subject line.
    In order to ensure a compact design of the recording device and at the same time to ensure that the same area of the object is recorded, it can be provided that a line sensor is used as a recording unit to produce the images, in front of which two optics are arranged such that the first optical system is the object line is imaged on a first subarea of the line sensor, wherein the first optics is transmissive only for light having a polarization perpendicular to the plane of incidence that the second optics images the subject line on a second portion of the line sensor, the second optics only for light having a polarization parallel to Level of infiltration is permeable.
    Alternatively it can be provided that two line sensors are used as a recording unit, in front of which an optical system is arranged that the first optics images the subject line on the first line sensor, the first optics only for light with a polarization perpendicular to the plane of incidence is permeable, that the second optics images the subject line on the second line sensor, wherein the second optics is transparent only for light having a polarization parallel to the plane of incidence.
    A numerically efficient determination of the offset provides for determining the offset, the cross-correlation function is determined for the two images, that in the cross-correlation function for two independent maxima is searched, and the distance between the two maxima is determined as an offset and that the offset thus determined is compared with a predetermined threshold and, when the threshold is exceeded by the offset, it is determined that the texture and the plastic layer do not overlap one another.
    For advantageous determination of the conformity of the relief with the texture in the case of plastic reliefs, it can be provided that light with a wavelength in the range between 500 nm to 780 nm is used for illumination and / or that the recording unit detects light in the range between 500 nm and 780 nm.
    The invention solves this problem in a recording device with the features of claim 8.
    The invention provides that for the inspection of a, in particular flat, object with a texture with a printed predetermined color gradient, and a transparent plastic layer with relief-like, the color gradient corresponding course, which is located above the texture, and to determine whether the texture and the plastic layer lie precisely one above the other, comprising a) a lighting unit for illuminating the object with unpolarized light irradiating the Brewster angle, with a maximum deviation of 10 °, on the surface of the object, b) a receiving unit, the object from the opposite side, wherein the optical axis of the receiving unit in the Brewster angle, with a maximum deviation of +/- 10 °, to the surface of the object, and wherein the optical axis of the recording unit and direction of irradiation of the incident light in one Level, c) one before shooting arranged or positionable first polarization filter which is transparent only to light having a polarization perpendicular to the plane of incidence, d) a front of the receiving unit arranged or positionable second polarization filter which is transparent only for light having a polarization parallel to the plane of incidence, e) wherein the recording unit for creating a first image is formed by filtering the light incident thereon with the first polarization filter and a second image filtering the incident light with the second polarization filter, f) a comparison unit comparing the two images by correlation with each other and an offset of the two G) a decision unit that compares the offset thus determined with a predetermined threshold and determines when the threshold is exceeded by the offset, d the texture and the plastic layer are not exactly on top of each other. The invention allows in this way a particularly simple detection of the accuracy of fit of prints and reliefs.
    A preferred aspect of the invention provides that the image acquisition unit is formed by a line sensor comprising a number of sensor pixels arranged in a row, wherein the line direction of the line sensor is parallel to the surface of the article, that a transport device is present, which comprises the object and the image acquisition unit relative to each other along a predetermined transport direction relative to each other, wherein the direction of movement is in a plane parallel to the surface of the object and normal to the sensor line of the image pickup unit, that the image pickup unit creates images of a subject line of the object, wherein the object line is normal to the transport direction of the article, and that the Image pickup unit, the first image and the second image by merging the line images or parts of the line images created, wherein the image pickup unit taken the line images with polarization perpendicular to the incidence plane to the first image and the line images recorded with polarization parallel to the plane of incidence joins the second image. This makes it possible for the entire picture to ensure compliance with the Brewster angle when recording. Errors that arise due to the non-exact compliance with the Brewster angle in peripheral areas, thus do not occur.
    For the same purpose, it can be provided that the lighting unit homogeneously illuminates the object line of the object detected by the line sensor, wherein the lighting unit is in particular formed by a cell-shaped light source, which is normal to the transport direction, facing the line sensor and light at Brewster's angle to the subject line.
    In order to ensure a compact design of the receiving device and simultaneously ensure that the same area of the object is simultaneously recorded, it can be provided that the receiving unit is formed by a line sensor, in front of which two optics are arranged, that the first optics, the item line to a first Part of the line sensor images, wherein the first optics is transparent only for light having a polarization perpendicular to the plane of incidence that the second optics images the subject line to a second portion of the line sensor, the second optics is transparent only for light having a polarization parallel to the plane of incidence ,
    An alternative design provides that the receiving unit by two
    Line sensors is formed, in front of each of which an optic is arranged, that the first optics images the object line on the first line sensor, wherein the first optics is transparent only for light having a polarization perpendicular to the plane of incidence that the second optics, the subject line to the second
    Line sensor images, the second optics is transparent only for light with a polarization parallel to the plane of incidence.
    A numerically efficient determination of the offset provides that the comparison unit for determining the offset determines the cross-correlation function for the two images that the comparison unit in the cross-correlation function determines.
    Correlation function searches for two independent maxima, determines the distance between the two maxima as offset, and a decision unit that compares the thus determined offset with a predetermined threshold and determines when the threshold is exceeded by the offset that the texture and the plastic layer does not fit lie one above the other.
    For advantageously determining the correspondence of the relief with the texture in the case of plastic reliefs, it can be provided that the lighting unit emits light with a
    Wavelength in the range between 500 nm to 780 nm and / or that the recording unit is sensitive to light in the range between 500 nm to 780 nm.
    Some preferred embodiments will be further illustrated by the following drawing figures.
    Fig. 1 shows the general underlying and exploited by the invention physical effect. Fig. 2 shows the behavior of a relief printing when it is irradiated with light that irradiates at its Brewster angle on its surface. Fig. 3 shows the physical phenomena underlying the method. 4 shows a first embodiment of the invention with an area camera. Fig. 5 shows a third embodiment of the invention with two line scan cameras. FIGS. 5a to 5c show the evaluation of detected images and the detection of a defective object. FIGS. 6a to 6c show the evaluation of determined images and the determination of a defect-free object.
    In Fig. 1, an incident light beam UN is shown, which meets at the Brewster angle ΘΒ on a transparent surface O. The Brewster angle Ob represents the angle at which the beam LRim reflected by the surface O is at right angles to the beam LE entering the surface. The individual beams lie in the same plane, which represents the plane of the drawing in FIG. This level is referred to below as the incidence level.
    The incident light beam L | N is not polarized and has polarization components both perpendicular and parallel to the plane of incidence, as indicated by the arrows shown and the arrows normal to the image plane of FIG. The reflected from the surface O ray Lr has only light components that are normal to the plane of incidence. The penetrating into the surface of the beam LE has predominant light components, which are parallel to the plane of incidence.
    In Fig. 2, an article 1 is shown with a plastic layer, which is used for a wood imitation. Usually, the plastic layer is formed in the form of a relief printing. The physical phenomena underlying the method are first represented in a simplified manner by means of a planar plastic layer. The article has on its surface a texture 10 having a printed predetermined color gradient. About this texture 10, a relief 11 is applied in the form of a transparent plastic layer having a relief-like course. The course of the relief 11 essentially corresponds to the color gradient. Since the structures of the relief 11 are similar to the structures of the textures, the impression of wood imitation is realistic.
    When the incident beam UN reaches an area of the surface of the relief 11 of the object 1 which is approximately parallel to the surface of the texture 10 of the object, the beam L | N just falls on the surface at the Brewster angle. The light beam Lin divides into the beam Le penetrating into the surface on the one hand and the beam LR reflected by the surface on the other hand. The surface-reflected beam LR is reflected at the Brewster angle. The penetrating into the surface of the beam LE is diffusely reflected on the texture 10, wherein a portion of the diffusely reflected light penetrates through the relief 11 and emerges from the relief 11 so that it is radiated at the Brewster angle from the surface of the relief 1 , In the event that the incoming light beam L | N strikes a region of the relief 11 which is not parallel to the texture 10 (FIG. 3), the surface-reflected beam LR is not reflected at the Brewser angle and can be reflected by a At this angle directed to the surface receiving unit 3 can not be detected. A portion of the penetrating into the surface of the beam LE is diffusely reflected, penetrates through the relief 11 and exits from the relief 11 so that it is radiated from the surface of the relief 1 at Brewster angle. In this way, regions of the relief 11 that are approximately parallel to the surface can be distinguished from other regions of the relief 11.
    In a first embodiment of a receiving arrangement according to the invention shown in FIG. 4, an area camera 3 is directed onto the object which is irradiated by a lighting unit 2. The illumination unit 2 is designed to illuminate the object 1 with unpolarized light and irradiates light at Brewster's angle Gβ to the surface normal of the object 1. It is not necessary that this angle is exactly maintained. It is also sufficient that the deviation of the angle of the incident light to the Brewster angle is a maximum of 10 °.
    The receiving arrangement further comprises a receiving unit 3, which images the object 1 from the opposite side. The optical axis of the recording unit is in the Brewster angle to the surface normal of the object 1. Again, it is not necessary that this angle is maintained exactly. Again, it is sufficient that the deviation of the angle of the incident light to the Brewster angle is a maximum of 10 °.
    The optical axis of the recording unit 3 and illumination unit 2 of the incident light lie in a plane which is referred to as the plane of incidence.
    The recording unit designed as a surface sensor produces a first image Bi (FIG. 5a) of the object 1. In this recording, a first polarization filter is arranged in front of the recording unit 3, which is transparent for only light having a polarization perpendicular to the plane of incidence.
    The recording unit designed as a surface sensor creates a second image B2 (FIG. 5b) of the object 1. In this recording, a second polarization filter is arranged in front of the recording unit 3, which is transparent to light with only one polarization parallel to the plane of incidence.
    At best, it is also possible to use a single polarization filter which is rotated between the recordings and has a second polarization direction when the second image is recorded. In addition, with some polarization filter materials it is also possible to achieve the polarization direction of the polarization filter by electrical control.
    The two images B-i, B2 are forwarded to a comparison unit, which compares the two images by correlation with one another and determines an offset of the two images relative to each other on the basis of the result of the correlation.
    The comparison unit preferably determines the cross-correlation function for the two images Β-1, B2 (FIG. 5c) to form the offset. The comparison unit searches in the cross-correlation function for two independent maxima. This distance between the two maxima corresponds to the offset.
    The reason for the emergence of two maxima in the presence of a shift between the relief and the texture layer is that the penetrating into the relief beam LE is only predominantly polarized parallel, but also contains proportions of perpendicularly polarized light. As a result, the texture layer appears in both pictures Β-ι, B2. Therefore, a maximum of the cross-correlation function arises from the fact that the texture layer contained in the two images Β-ι, B2 agrees with itself. The other maximum of the cross-correlation function arises from the fact that the relief and the texture in the two images B-i, B2 match.
    A decision unit compares the thus determined offset with a predetermined threshold value and determines when the threshold value is exceeded by the offset that the texture 10 and the plastic layer 11 do not lie exactly on top of each other. Otherwise, it notes that the texture 10 and the plastic layer 11 of the relief lie exactly on top of each other.
    In a second embodiment of the invention, a line sensor 3 is used which is aligned with the object 1. If a line sensor 3 is used instead of a surface sensor, only one article line 12 of the article 1 is received at a time of recording. The recording of the article 1 takes place in individual time steps, wherein the object 1 is transported relative to the line sensor 3 along a transport direction T; the image to be created Β-ι, B2 is composed of the individual recorded line images. The main advantage of this procedure is that the individual recorded line images were each taken at the same angle, which allows a better and more precise setting of the Brewster angle for the individual image.
    In the present case, the line sensor comprises a number of sensor pixels arranged in a row. The row direction of the line sensor 3 is parallel to
    Surface of the article 1. The article 1 is moved by a transport unit in a transporting direction T. This is parallel to the surface of the object 1 and normal to the sensor line of the line sensor 3. With the image pickup unit 3 line images of a subject line 12 are created, which is normal to the transport direction T of the article 1.
    Alternatively, it is also possible to move the receiving device comprising the lighting unit 2 and the image pickup unit 3 along the transport direction or against the transport direction and to hold the object 1. Overall, therefore, a relative movement between the receiving device and the object 1 is sufficient.
    For illumination of the object 1, as in the first embodiment of the invention, any illumination unit 2 can be used which irradiates light onto the object or onto the object line 12 at the Brewster angle. In the present embodiment of the invention, a lighting unit 2 is preferably used which illuminates the object line 12 homogeneously. For this purpose, in particular, a cellular illumination unit 2 with a narrow radiation angle into consideration, the line direction is normal to the transport direction T, the line sensor 3 is opposite and emits light at the Brewster angle on the item line 12.
    In order to obtain two images, each with a different polarization direction, different methods can be used. When using line sensors 3, the first image B-i and the second image B2 are created by combining the individual line images or parts of the line images, which show the object 1 each recorded with the same polarization.
    An advantageous possibility for creating the images B-i, B2 is to use a single line sensor 3 as a recording unit, in front of which two optics are arranged. These two optics enable the object line 12 to be imaged twice on the sensor line, namely due to the first optics to a first contiguous portion of the line sensor 3 and due to the second optics to a second portion of the line sensor 3. Both optics are each with different Provided polarizing filters.
    The first optic images the object line 12 onto a first subarea of the line sensor 3, the first optic being transparent only to light having a polarization perpendicular to the plane of incidence. Therefore, the directly reflected light Lr is essentially imaged onto the first subarea of the line sensor 3.
    The second optical system images the article line 12 onto a second subregion of the line sensor 3, wherein the second optical system is permeable only to light having a polarization parallel to the plane of incidence. On the second portion of the line sensor 3, therefore, essentially that portion of light is shown, which has passed through the relief and is passed to the line sensor.
    To create the first image B-i, the cell-shaped partial images which are created with the first partial region of the line sensor are combined. Likewise, to generate the second image B2, the cell-shaped partial images which are created with the second partial region of the line sensor are combined.
    In the illustrated in Fig. 5 the third embodiment, which corresponds to the following illustrations of the second embodiment of the invention, two separate line sensors 3a, 3b are used as recording unit to create the images Β-ι, B2, wherein before each line sensor 3a, 3b in each case a separate optics is arranged. As in the second embodiment is ensured by the different polarization of the two optics that separate images Β-ι, B2 are created, each showing the light of identical subject areas 12 each with different polarization direction.
    The first optic images the subject line 12 onto the first line sensor 3a, the first optic being transparent only to light having a polarization perpendicular to the plane of incidence. The second optic images the item line 12 onto the second line sensor 3b, the second optic being transparent only to light having a polarization parallel to the plane of incidence.
    To create the first image Bi, the cell-shaped images that are created with the first line sensor 3a are combined. Likewise, to generate the second image B2, the cell-shaped images that are created with the second line sensor 3b are combined.
    The final arithmetical comparison can be made in all embodiments of the invention as in the first embodiment of the invention.
    It is particularly preferred in all embodiments of the invention for the consideration of plastic reliefs light with a wavelength in the range between 500 nm to 780 nm used. The illumination unit emits light with a wavelength in the range between 500 nm to 780 nm. The recording unit is sensitive to light in the range between 500 nm to 780 nm.
    权利要求:
    Claims (14)
    [1]
    claims:
    1. A method for inspecting a, in particular flat, object (1) comprising - a texture (10) with a printed predetermined color gradient, and - a transparent plastic layer (11) with relief-like, the color gradient corresponding course, the above the texture (10 ) is arranged, for determining whether the texture (10) and the plastic layer (11) fit over one another, a) wherein the object (1) is illuminated with unpolarized light, the Brewster angle (Θβ), possibly with a deviation of at most 10 °, to which the object (1) is blasted, b) the object (1) being picked up from the opposite side by means of a recording unit whose optical axis is at Brewster's angle (Θβ), possibly with a maximum deviation of + / - 10 °, the surface of the object (1) is, and wherein the optical axis of the recording unit and the direction of irradiation of the incident light lie in a plane, c) wherein the receiving unit ei n first image (Bi) of the object (1) is created, wherein for recording only light with a polarization perpendicular to the plane of incidence is used, d) wherein the recording unit (3) a second image of the object (1) is created, wherein the Recording only light with a polarization parallel to the plane of incidence is used, e) wherein the two images (Bi, B2) are compared by correlation with each other and an offset of the two images (Bi, B2) is determined based on the result of the correlation, and f ) that the offset thus determined is compared with a predetermined threshold value and, when the threshold is exceeded by the offset, it is determined that the texture (10) and the plastic layer (11) do not fit one over the other.
    [2]
    2. The method according to claim 1, characterized in that - a line sensor comprising a number of sensor pixels arranged in a row is used as the image recording unit, wherein the line direction of the line sensor is parallel to the surface of the object, that the object (1) and the image pickup unit in a plane parallel to the surface of the article (1) and normal to the sensor line of the image pickup unit along a predetermined transport direction (T) relative to each other are relatively moved, - that with the image pickup unit (3) images of a subject line of the article (1 ) which is normal to the transport direction (T) of the article (1), and - that the first image (Bi) and the second image (B2) are composed by combining the line images or parts of the line images which comprise the article (1) each recorded at the same polarization show, created.
    [3]
    3. The method according to claim 2, characterized in that the object line (12) of the object (1), which is detected by the line sensor, is homogeneously illuminated, in particular by means of a cellular light source (2), which is normal to the transport direction (T), the line sensor (3) is opposite and radiates light at Brewster angle on the item line.
    [4]
    4. The method according to claim 2 or 3, characterized in that - to produce the images (Β-ι, B2) a line sensor (3) is used as a receiving unit, in front of the two optics are arranged, - that the first optics, the item line ( 12) to a first subregion of the line sensor (3), wherein the first optical system is permeable only to light having a polarization perpendicular to the plane of incidence, - the second optical system images the article line (12) onto a second subregion of the line sensor (3), wherein the second optic is transparent only to light having a polarization parallel to the plane of incidence.
    [5]
    5. The method according to claim 2 or 3, characterized in that - to produce the images (Bi, B2) two line sensors (3a, 3b) are used as a receiving unit, in front of each of which an optic is arranged, - that the first optics, the item line (12) to the first line sensor (3a), wherein the first optics is transparent only to light having a polarization perpendicular to the plane of incidence, - that the second optic images the object line (12) onto the second line sensor (3b), the second one Optics is transparent only to light with a polarization parallel to the plane of incidence.
    [6]
    6. The method according to any one of the preceding claims, characterized in that for determining the offset, the cross-correlation function for the two images (Β-ι, B2) is determined that in the cross-correlation function is searched for two independent maxima, and the distance between the two maxima is determined as an offset, and that the offset thus determined is compared with a predetermined threshold value and if the threshold is exceeded by the offset, it is determined that the texture (10) and the plastic layer (11) are not exactly one above the other ,
    [7]
    7. The method according to any one of the preceding claims, characterized in that light is used with a wavelength in the range between 500 nm to 780 nm for illumination and / or that the recording unit detects light in the range between 500 nm to 780 nm.
    [8]
    8. receiving arrangement for inspection of a, in particular flat, object (1) with a texture (10) with a printed predetermined color gradient, and a transparent plastic layer (11) with relief-like, the color gradient corresponding course, the over the texture (10) and for determining whether the texture (10) and the plastic layer (11) are precisely superimposed, comprising a) a lighting unit (2) for illuminating the object (1) with unpolarized light at the Brewster angle (Θβ), b) a receiving unit (3), which images the object (1) from the opposite side, wherein the optical axis of the receiving unit in the Brewster angle , with a maximum deviation of +/- 10 °, to the surface of the object (1), and wherein the optical axis of the receiving unit and direction of irradiation of the irradiated Lic hts lie in one plane, c) a front of the receiving unit (3) arranged or positionable first polarization filter is transparent only for light having a polarization perpendicular to the plane of incidence d) a front of the receiving unit (3) arranged or positionable second polarization filter only for E) wherein the recording unit (3) for creating a first image (Β-ι) by filtering the light incident at her with the first polarizing filter and a second image (B2) with filtering the at f) a comparison unit which compares the two images (Β-ι, B2) by correlation with one another and determines an offset of the two images relative to one another on the basis of the result of the correlation, and g) a decision unit, the so determined offset with a given Schwellenw If the threshold value is exceeded by the offset, it is determined that the texture (10) and the plastic layer (11) do not fit over each other.
    [9]
    9. Recording arrangement according to claim 8, characterized in that - the image recording unit (3) is formed by a line sensor comprising a number of arranged in a row sensor pixels, wherein the line direction of the line sensor is parallel to the surface of the article (1), - that a Transport device is present, which moves the object (1) and the image recording unit (3) along a predetermined transport direction (T) relative to each other, wherein the direction of travel in a plane parallel to the surface of the article (1) and normal to the sensor line of the image pickup unit (3) - that the image recording unit (3) creates images (Β-ι, B2) of an article line (12) of the article (1), the article line (12) being normal to the transport direction (T) of the article (1), and in that the image acquisition unit (3) combines the first image (Bi) and the second image (B2) by combining the line images or parts of the line images first The image pickup unit (3) combines the line images taken with polarization perpendicular to the plane of incidence to the first image (B-i) and the line images taken with polarization parallel to the plane of incidence to the second image (B2).
    [10]
    10. Recording arrangement according to claim 9, characterized in that the illumination unit (2) that item line (12) of the object (1), which is detected by the line sensor (3), homogeneously illuminated, wherein the illumination unit (2) in particular by a cellular light source is formed, which is normal to the transport direction (T), the line sensor (3) opposite and emits light at Brewster angle on the item line (12).
    [11]
    11. Recording arrangement according to claim 9 or 10, characterized in that - the recording unit (3) is formed by a line sensor, in front of which two optics are arranged, - that the first optics the article line (12) on a first portion of the line sensor (3 ), wherein the first optics is transmissive only to light having a polarization perpendicular to the plane of incidence, - that the second optics images the object line (12) onto a second subarea of the line sensor (3), the second optic only for light with one polarization is permeable parallel to the plane of incidence.
    [12]
    12. Recording arrangement according to claim 9 or 10, characterized in that - the recording unit is formed by two line sensors (3a, 3b), in front of which an optical system is arranged in each case, - that the first optical system the article line (12) on the first line sensor ( 3a), wherein the first optical system is permeable only to light having a polarization perpendicular to the plane of incidence, - that the second optical system images the article line (12) onto the second line sensor (3b), the second optical system being parallel only for light having one polarization is permeable to the plane of incidence.
    [13]
    13. Recording arrangement according to one of the preceding claims, characterized in that the comparison unit for determining the offset determines the cross-correlation function for the two images that the comparison unit searches in the cross-correlation function for two independent maxima, the distance between the two maxima determined as an offset, and a decision unit that compares the offset thus determined with a predetermined threshold and determines when the threshold is exceeded by the offset that the texture (10) and the plastic layer (11) are not precisely on top of each other.
    [14]
    14. Recording arrangement according to one of the preceding claims, characterized in that the illumination unit emits light having a wavelength in the range between 500 nm to 780 nm and / or that the recording unit is sensitive to light in the range between 500 nm to 780 nm.
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    同族专利:
    公开号 | 公开日
    EP3086082A1|2016-10-26|
    EP3086082B1|2017-03-29|
    AT517150B1|2018-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4015127A|1975-10-30|1977-03-29|Aluminum Company Of America|Monitoring film parameters using polarimetry of optical radiation|
    US4967093A|1988-06-22|1990-10-30|Hamamatsu Photonics Kabushiki Kaisha|Deformation measuring method and device using cross-correlation function between speckle patterns with reference data renewal|
    GB9922489D0|1999-09-23|1999-11-24|Mullaney Lawrence|Measuring relief imaged printing plates|
    US20050174583A1|2000-07-06|2005-08-11|Chalmers Scott A.|Method and apparatus for high-speed thickness mapping of patterned thin films|
    JP2005294365A|2004-03-31|2005-10-20|Matsushita Electric Ind Co Ltd|Method and device for polishing end detection and semiconductor device|
    US8045142B2|2007-12-18|2011-10-25|Ebara Corporation|Polishing end point detection method, polishing end point detection apparatus and polishing apparatus|DE102016222551B3|2016-11-16|2018-01-18|Innovent E.V.|Method and device for determining surface modifications on optically transparent components|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50324/2015A|AT517150B1|2015-04-23|2015-04-23|Inspection with polarizing filters|ATA50324/2015A| AT517150B1|2015-04-23|2015-04-23|Inspection with polarizing filters|
    EP16156413.3A| EP3086082B1|2015-04-23|2016-02-19|Inspection with polarisation filters|
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