DE102012021725A1 - Quality inspection of a tilting image of a lens structure - Google Patents

Abstract

The present invention discloses an apparatus and a method for checking the quality of a tilted image of a lens structure 4, which is arranged on a support 2, which is characterized in that the support 2 is mounted on a holder 6, wherein the holder 6 from a motor 8 is turned. A light source 10 illuminates the lens structure 4 while an optical pickup 12 receives at least one image from the lens structure 4 during rotation of the holder 6. A data processing device 14 evaluates the at least one recorded image of the lens structure 4 with regard to its color values and controls the motor 8.

Description

The invention discloses an apparatus and method for checking the quality of a tilted image of a lens structure which is placed on a support, e.g. As a portable data carrier is located.

For labeling a carrier by means of a laser, one uses movable deflection mirrors via an electrical control. The distance between carrier and laser is usually relatively large. Consequently, such a method is very sensitive to disturbances.

During a laser inscription for the representation of images is usually worked in raster mode, d. H. the image is written line by line or column by column in well-defined and uniform distance by means of a pulsed laser in serial processing.

The eye of the beholder no longer sees the individual halftone dots on the finished label, but depending on the size of the dots and the distance to each other and depending on the ratio of black dots to a light background, a more or less strong gray.

If now during a laser inscription either the laser or the mirror or the carrier, z. As a card, irregular moves, z. B. by coupling of mechanical vibrations or vibrations, so the distance of the grid points changed accordingly. Depending on the nature and duration of the disturbance then dark, d. H. a smaller dot pitch, or bright, d. H. a larger dot pitch, stripes in the lasered image.

Accordingly, stripe structures can result if an electrical coupling, z. B. a 50 Hz hum, the Ansteuer- or positioning logic disturbs the deflection mirror.

Other effects that can lead to stripe structures in the laser image, z. B. laser power fluctuations, d. H. Dot size changes during laser marking.

In addition to stripes, there are quality defects in the form of more or less punctiform or patchy dark or light structures in the area of lasered images or, in severe cases, also in the area of lasered letters. The causes are usually rather complex and can be due to locally limited inclusions in the map, z. As lint be explained, go on dependence on the / the used ink (s) incl. UV printing to short-term effects in the laser range such. B. incorrectly set first-pulse suppression etc.

Corresponding quality-reducing effects that lead to banding or staining are also found in personalization processes that use printing technology (eg inkjet printing).

Within ongoing card personalization under production conditions, the challenge now is to determine if a personalized card or passport is a good or a bad ("reject") document. As a criterion for this can be z. B. Determine the number and size of the disturbance. If the number or size of the disturbances now exceeds a predetermined amount, the corresponding document (card, passport) is rejected as a reject.

The examination of the quality of information to be displayed in a data carrier, which are executed in the form of a tilted image of a lens structure in a portable data carrier, is carried out by a subjective visual examination and evaluation z. As the contrast, the tilting behavior or the total intensity.

For a carrier, all suitable carriers come into question. In particular, portable data carriers are used as carriers. Lens structures are on portable data carriers, such as. As credit cards, health cards, passports, identity cards, visa, bills, tickets, SIM cards, etc. applied.

A disadvantage of the subjective examination is that neither an objective evaluation of the quality of the information to be displayed is possible nor an objective comparison between two lens structures, which each represent a tilted image, is possible.

WO 2010/043443 A1 discloses a method and apparatus for inspection of lens structures. Here, the brightness values or color values represented by a lens structure are tested at two different angles without an inscription being applied. Thus, for example, defects in or near the lens surface can be detected. In principle, it is possible to sort out cards which have bad lenses before labeling cards with lens structures. However, the costs for producing the cards have already been incurred. A conclusion on the problem causing the quality reduction is in most cases no longer possible at this stage. An examination of the quality of representation of introduced into the lens structure information, taking into account the tilting behavior is not possible here.

In order to examine and evaluate the shaping and execution of lens structures, the lens parameters are determined by geometrical measurement of the lens parameters, e.g. B. measured by means of a height sensor. However, this test method only checks the geometric or optical properties of the lens structures and provides no information about the tilting behavior and the quality of the representation of inscribed information. However, tilting behavior, display quality, sharpness and contrast are influenced by a complex interplay between lens parameters, design of the inscription, eg. As resolution, color, and card design determined. A final assessment of the quality of the tilting behavior of the lens structures or the quality of the information represented by the tilting behavior of the lens structure is therefore only possible on the end product, ie on the carrier already produced with an applied lens structure.

The object of the invention is to find a solution for overcoming the disadvantages of the prior art.

In particular, it is an object of the invention to find a solution to allow an objective assessment of the quality of presentation of the tilting effect of a lens structure.

The object of the invention is achieved by the independent claim and the independent claim. Advantageous embodiments are described in the dependent claims.

• – eine Halterung, zur Befestigung des Trägers,
• – einen Motor, um die Halterung zu drehen,
• – einer Lichtquelle, um die Linsenstruktur zu beleuchten,
• – eine optische Aufnahmevorrichtung, um mindestens ein Bild von der Linsenstruktur während der Drehung der Halterung aufzunehmen,
• – eine Datenverarbeitungseinrichtung, um das mindestens eine von der optischen Aufnahmevorrichtung aufgenommene Bild hinsichtlich seiner Farbwerte auszuwerten und um den Motor zu steuern.

In order to achieve the object, the invention discloses a device for checking the quality of a tilted image of a lens structure, which is arranged on a carrier, characterized in that it comprises the device

• A holder for fixing the carrier,
• A motor to rotate the mount,
• A light source to illuminate the lens structure,
• An optical pick-up device for picking up at least one image of the lens structure during rotation of the holder,
• - A data processing means for evaluating the at least one image taken by the optical pickup device with respect to its color values and to control the motor.

An advantageous embodiment is characterized in that the motor is a stepping motor to rotate the holder gradually by a defined angle.

Another advantageous embodiment is characterized in that the optical recording device is a camera.

A further advantageous embodiment is characterized in that the device has a shield against extraneous light.

A further advantageous embodiment is characterized in that at least the holder and / or the light source and / or the optical detection device are set up such that a distance and / or an angle to the lens structure can be variably adjusted.

Another advantageous embodiment is characterized in that the optical detection device is a microscope.

Another advantageous embodiment is characterized in that the light source generates a white or a colored light.

Another advantageous embodiment is characterized in that the carrier is a portable data carrier.

• – befestigen des Trägers auf einer Halterung,
• – drehen der Halterung mittels eines Motors,
• – beleuchten der Linsenstruktur mit einer Lichtquelle,
• – aufnehmen mindestens eines Bildes von der Linsenstruktur während der Drehung der Halterung mittels einer optischen Aufnahmevorrichtung,
• – auswerten des mindestens einen von der optischen Aufnahmevorrichtung aufgenommenen Bilds hinsichtlich seiner Farbwerte und steuern des Motors mittels einer Datenverarbeitungseinrichtung.

The invention further discloses, in order to achieve the object, a method for checking the quality of a tilted image of a lens structure which is arranged on a support, characterized in that the method comprises at least the following steps

• - fixing the carrier on a holder,
• Turning the holder by means of a motor,
• Illuminate the lens structure with a light source,
• Receiving at least one image from the lens structure during rotation of the holder by means of an optical recording device,
• Evaluating the at least one image recorded by the optical recording device with respect to its color values and controlling the motor by means of a data processing device.

An advantageous embodiment is characterized in that at least one field to be measured is defined in the lens structure to be tested.

A further advantageous embodiment is characterized in that at least two fields to be measured, the fields are the same or different sizes.

Another advantageous embodiment is characterized in that at least one test pattern is introduced into the lens structure.

A further advantageous embodiment is characterized in that the test pattern comprises at least two surfaces which have the same or different color values.

A further advantageous embodiment is characterized in that the test pattern comprises at least two surfaces which are the same or different in size.

Another advantageous embodiment is characterized in that the test pattern is introduced into the lens structure by means of a laser.

A further advantageous embodiment is characterized in that the color values are evaluated for all the images which are taken by the lens structure during rotation of the holder for at least one surface and / or test pattern to be measured.

A further advantageous embodiment is characterized in that at least one image is taken of the lens structure per an angular position to be determined during the rotation.

The present invention provides an objective measuring method which makes it possible to objectively judge the quality of the presentation of information by means of the tilting effect of a lens structure.

The measuring method can be carried out, for example, by means of suitably prepared carriers having a lens structure, with which the assessment of an expected quality of a production batch can be carried out.

Furthermore, the invention makes it possible, on the one hand, to check the quality of lens-producing production means, such as e.g. B. laminating sheets. Conversely, the invention allows a sorting out of inappropriate production means.

On the other card structures, such. As film thicknesses, film coatings, etc., are tested for their principal suitability for the presentation of tilting effects.

Heretofore, carriers having tilting lens structures have been tested by positioning a lens-structured carrier by hand relative to a fixed light source. The carrier was tilted about the transverse axis and tested with the naked eye, the tilting image of the lens structure on a tilting out.

For testing according to the invention to be tested lens structure on a support such. As a credit card or passport page applied. Optionally, in the lens structure, a test pattern z. B. be introduced by laser. Subsequently, the lens structure to be tested is measured and tested with the device described above and the method described above. The determined color value is then displayed as a function of the angle at which the optical detection device has taken pictures from the lens structure. A measurement curve showing the course of the color values as a function of the angle which lies between the rotated holder and the optical detection device is assessed on the basis of defined criteria. As a rule, the trace has a so-called Gaussian shape. A broad and flat curve means poor quality. A narrow and high curve means a good quality.

The test pattern according to the invention consists of different light to dark gray areas. Alternatively, the surfaces may also be black or white or any other suitable color. Furthermore, so-called gray wedges may be included in the test pattern. A gray wedge has a stepless progression from the light to the dark, z. From black to white. The test pattern according to the invention is introduced into the lens structure by means of a laser. When introducing a so-called calibrated laser system is used, which has a defined laser power or a defined color value, for. B. a gray value has. For example, a so-called dot-per-inch value (dpi value) is defined. For example, the test pattern is centered within the lens structure. The test pattern has a scaling of, for example, 1: 1. This means that a grid of, for example, quadrilateral areas has an area of 0.64 x 0.64 square millimeters. This can be used, for example, to measure or control the lens width.

To test the carrier with a lens structure with tilting effect, the carrier is mounted on a holder. The holder is rotated by a motor. Advantageously, a stepping motor is used. A stepper motor has the advantage that the holder is rotated stepwise, with each step corresponding to a certain angle. The angle can be adjusted. The smaller the angle, the better the accuracy of the data to be evaluated. An optical pickup device captures at least one image of the lens structure during rotation. Advantageously, at least one image is taken for each angular step by which the holder is rotated. After taking the images for at least a partial rotation, at least one surface to be measured in the images, so-called "regions of interest (ROI)" is defined. Advantageously, multiple ROIs are defined. Here it is recommended at least a ROI for a bright, z. B. white, and a dark, z. For example, to define black areas in the image. The ROIs advantageously have the same area size. Before evaluating the captured images, it is checked whether the ROIs are correctly positioned for each measured angle or image.

For each ROI then the color value, z. Gray value, black level, white level, etc., for each angle of rotation of the holder with the lens structure. From these values, an average over all images for the respective ROI is then advantageously determined, for. B. an average gray value or a mean white value for each ROI. The color values determined are entered into a diagram via the angle and evaluated, as described above.

Thus, an objective quality inspection of a tilted image of a line structure is possible with the present invention.

A great advantage of the invention is that any quality-reducing effects are detected early, for example, even before mass production, since the quality inspection is carried out on the basis of appropriately prepared so-called test specimens, which are corresponding carriers with lens structure with tilting effect.

The method can be used to determine the cause of quality degrading effects associated with tilting images. For example, critical laminating sheets can be checked and replaced if necessary.

After eliminating the cause of a quality reduction, the reject rate is reduced and the associated costs are avoided.

The device and method are expandable. So z. B. the positions of lenses, their radii or the angular accuracy of inscribed in the lens structure, for example, rectangular structures are checked and measured. Further extensions are, for example, the examination of the quality of representation of metallic structures in the data carrier, such as a hologram or a kinegram or a security thread.

In the following, embodiments of the invention will be described in detail with reference to the accompanying drawings.

Show it

1 the basic structure of a device according to the invention,

2 exemplary measuring curves for color values determined according to the invention, in this case gray values, of two patterns which are plotted over the angle when taking the picture,

3 an inventive test pattern,

4 shows an inventive image of a lens structure with an inventive surface to be measured, so-called region of interest (ROI).

1 shows the basic structure of a device according to the invention. The device according to the invention for checking the quality of a tilted image of a lens structure 4 which are on a support 2 is arranged, comprises a holder 6 , for fixing the carrier 2 , The holder 6 is by a motor 8th turned. A light source 10 illuminates the lens structure 4 , An optical recording device 12 take at least one picture of the lens structure 4 during rotation of the bracket 6 on. A data processing device 14 evaluates the at least one of the optical recording device 12 recorded image in terms of its color values and controls the engine 8th , The data processing device 14 is via suitable contact-bound and / or contactless communication links with the engine 8th , the light source 10 and the optical pickup device 12 connected.

The motor 8th is advantageously a stepper motor to the holder 6 gradually to rotate by a defined angle.

The device according to the invention has a shield against extraneous light. The shield is not shown for reasons of clarity. The shield consists of an opaque material. Advantageously, the shield can be opened and closed to a carrier to be tested 2 with lens structure 4 in the holder 6 to insert or remove from this.

At least the holder 6 and / or the light source 10 and / or the optical detection device 12 are set to have a distance and / or angle to the lens structure 4 are variably adjustable.

The optical recording device 12 is advantageously a microscope or a camera. Advantageously, the optical recording device comprises 12 a combination of a microscope and a camera. The optical recording device 12 is capable of capturing still images and / or a continuous motion picture in the form of a movie.

In the optical recording device 12 are advantageously positioning aids to z. B. a target cross, a frame, a grid or the like in the image to be recorded.

In a step preceding the recording of an image, a calibration of the optical recording device 12 be carried out with the Target instead of a scale of a number of pixels to get a mm scale. For this purpose, for example, instead of a carrier to be tested 2 a mm scale and takes them with the optical recording device 12 on, so-called "teaching / learning" of the optical recording device 12 , The mm scale can then be accessed by simple conversion. The scale thus determined can then be faded into the recorded image and remains valid as long as the focus and the working distance of the optical recording device 12 to the carrier to be tested 2 nothing changes.

In principle, you can also use a reference image such. B. overlay a gray wedge the captured image.

By means of image processing in particular certain color values, brightness, etc. can be suppressed or enhanced.

Furthermore, you can use a picture filtering, z. B. Sobel filter, etc., z. B. highlight edges to z. B. to obtain a machine evaluable criterion. This allows the fully automatic measurement, for example, one on a support 2 applied test pattern 16 or realize the detection / measurement of print marks.

The light source 10 produces a white or a colored light or a light of a suitable wavelength, such. As infrared or ultraviolet. Furthermore, the generated light is uniform and diffuse.

The carrier 2 is a portable data carrier, such. B. a smart card, a passport, an identity card, a driver's license, a credit card, a health card, a visa, a document of value, a bill, etc.

The present invention further discloses a method for checking the quality of a tilt image of a lens structure 4 which are on a support 2 is arranged. For this, at least one area to be measured 26 , so-called "region of interest", abbreviated to ROI, in the lens structure to be tested 4 Are defined. For at least two surfaces to be measured 26 , are the surfaces 26 the same or different sizes. Furthermore, optionally at least one test pattern 16 into the lens structure 4 is introduced. The test pattern 16 comprises at least two surfaces which have the same or different color values. In addition, the test pattern includes 16 at least two surfaces which are equal or different in size. The test pattern 16 is advantageously by means of laser in the lens structure 4 is introduced.

During or following a rotation of the bracket 6 Be aware of all the pictures taken by the lens structure 4 recorded for the entire and / or at least one surface to be measured 26 and / or test patterns 16 evaluated the color values. The color values can be evaluated with regard to the brightness and / or the color information. Advantageously, at least one image of the lens structure 4 recorded per one angular position to be determined during the rotation. If the engine 8th a stepper motor is and the holder 6 For example, in three degree increments, then for each three degree step, at least one image of the lens structure will be made 4 from the optical pickup device 12 added.

After taking the pictures through the optical recording device 12 , the images are evaluated.

In the simplest embodiment, only one surface to be measured 26 or a portion of each image of a sequence of captured images. The area to be measured 26 (ROI) is positioned the same for all images of the sequence, so that the area to be measured 26 for each angular position to be measured completely within the test pattern 16 lies. Depending on the angle, different color values result for the pictures of a sequence.

Alternatively, several subregions of each image of a sequence can be evaluated. If one evaluates for each picture several differently positioned surfaces to be measured 26 and compares the results of each image with each other, so you can z. B. statements regarding the uniformity of the lens structure to be tested 4 win.

By means of a surface to be measured 26 in the white and in the black area of the lens structure 4 inscribed test pattern 16 of each image of a sequence, for example by subtraction of the determined gray or color values, a so-called white balance for the optical recording device 12 be achieved. This is useful if the optical recording device used 12 does not have a manual white balance.

With the method described here, it is also possible to calculate effects that z. B. by an uneven illumination of the lens structure to be tested 4 during the image acquisition or the image sequence.

For example, the invention can be used to personalization systems for portable data carriers, such. As credit cards, identity cards, etc., to qualify. This can on the one hand in the However, on the other hand, it can also be used in ongoing production to detect possible quality defects in the personalization. Corresponding tests are also carried out after a plant has been repaired in order to prove that it has been successfully repaired or adjusted before resuming production.

This will be a prepared and geometrically defined test pattern 16 , z. A test grid, and a well-defined map, e.g. B. from reference material, which dimensions and properties accordingly ISO 7810 has used.

The system to be qualified writes the test pattern 16 on a carrier 2 , z. For example, a credit card. This test pattern 16 is then checked for correct size, tilt, distortion, etc.

A further test step in the qualification and acceptance of personalization systems is the control of the gray value calibration, in particular in laser systems, or the color calibration, especially in personalization systems with printing technology.

It is checked whether the Personalisierungsanlage the full extent of all gray values between black and white, and color values can represent the full color gamut, and whether the representation of the gray values, in particular the color values, stable, d. H. without drift, z. B. over a whole day of production is possible.

In addition, several systems of the same type can be adjusted to the same quality.

The verification of a gray value calibration can, for. B. be performed by a with a so-called gray wedge 20 described carrier 2 with lens structure 4 against a reference card, which consists of the same map material, in which case a reference material is necessary, is compared. A gray wedge 20 is a continuous gradient from a light to a dark color, z. B. a stepless progression from black to white. Comparison by visual inspection is common but inaccurate. In contrast, a comparison by densitometer, while accurate, but very expensive and is carried out only in exceptional cases. With the invention described herein, it is possible to perform such a comparison quickly, easily and objectively.

2 shows exemplary measurement curves of two patterns for color values determined according to the invention, here gray values, which are plotted over the angle when taking the image. The measurement curve of pattern 1, whose measuring points are marked with squares, is narrow and high and indicates a good quality. Accordingly, the trace of Pattern 2, whose measurement points are marked with circles, shows a broad and low gradient and thus a lower quality than the trace of Pattern 1.

For the representation and interpretation of the measuring points one carries the respectively measured color values, z. As brightness, above the respective angle at which the optical recording device 12 the lens structure 4 has recorded. The result is a curve that represents a typical lens structure 4 in about a Gaussian bell curve with one, in multi-level tilting images corresponding to several, pronounced peak / s. Areas far outside the angle under which the test pattern 16 , ie a "black" area, has been written in, usually having a high brightness, ie small gray values, areas within the angle below which the test pattern is written 16 has been written in, have a low brightness, ie large gray values.

The rating of the wearer to be tested 2 with lens structure 4 is done relative to previously set thresholds for the contrast, ie the difference between the light and dark areas, according to the height of the top, as well as the contrast, ie the width of the top. Measured values below this threshold give poor quality above this threshold. More specifically, a high tip means good quality and a flat tip means poor quality.

With a narrow tip, a large change in contrast occurs with little change in the viewing angle. At a broad peak, the contrast changes only slightly, even with a larger change in the viewing angle, the lens structure 4 shows only a small reaction. Correspondingly, a narrow tip means a good, a wide tip a bad quality.

In the case of multi-level tilt images, it is also possible to determine a selectivity between the individual tilt images by evaluating the maxima and minima of the curve.

Test results show that for significantly different lens radii, the shape of the measured curve is different. Accordingly, the quality criterion for a good or a bad lens structure 4 different for different lens radii.

Further quality criteria may be a uniformity or continuity of the measurement curve as well as a respective standard deviation of the gray values. Unsteady or noisy curves indicate disturbances within the surface to be measured 26 out, which are visible only at certain angles, so z. As lens inclusions, air bubbles or incompletely shaped lenses, e.g. B. laminating stains. A large standard deviation, ie a low accuracy of measurement indicates strongly noisy gray levels, caused z. B. by an uneven lens surface.

In the following, further possibilities for evaluating recorded images will be described. If one takes more than one picture per angle position, a so-called subsequence of pictures, then one can within a subsequence z. B. the position of the surface to be measured 26 vary and / or aperture, focus, shutter speed, etc. of the camera and thus change with methods that are known from digital image processing, the respective surface to be measured 26 expand, z. B. to achieve higher depth of field or greater brightness dynamics, so-called focus stacking technique or high dynamic range technology.

The device according to the invention is initially to be used as a separate device. In principle, however, the device according to the invention can also be installed in the form of a module in personalization systems and then used for process control or quality assurance.

3 shows a test pattern according to the invention 16 ,

The test pattern 16 includes four areas 18 which each comprise black and white squares. Horizontally a gray wedge runs in each case 20 , where the gray wedge 20 outside is dark and towards the middle of the test pattern 16 brighter. In the middle of the test pattern 16 There is a black stripe 22 and a white stripe 24 where both stripes 22 and 24 are arranged vertically.

The test pattern 16 in the simplest case consists of a black area of a certain size, e.g. B. 5 × 5 square millimeters. In principle, the larger the surface to be measured 26 of the test pattern 16 is, the lower the measurement error. The test pattern 16 is for example in the form of a file z. As a JPG or TIF encoded picture.

A carrier to be tested 2 with lens structure 4 is in a the actual measurement preliminary step under defined conditions, such. As specified ink or laser power defined, dpi value, etc., with a test pattern 16 described, printed or lasered. The test pattern 16 is z. B. by means of laser beam at an angle in an area of the carrier to be tested 2 into the lens structure 4 enrolled. As a result, in the simplest case, a single-stage tilt image is generated, which is sufficient for the measuring method described here.

In an extended embodiment, the test pattern 16 be supplemented with white or gray areas. This is z. B. facilitates the adjustment of the laser power for the labeling process.

Contains the test pattern 16 geometrically defined elements, such. As square or circular surfaces or even checkerboard pattern, so it can also distortion, angle accuracy of personalization or absolute size of the lens structure 4 being checked.

In a further embodiment, several, possibly different test patterns 16 defined at different angles in the carrier to be tested 2 be written in and overlap in whole or in part. This results in a multiple tilt effect, which can also be tested with the method described here.

In principle, a corresponding test pattern 16 also before lamination of a test carrier 2 be applied in the form of a card benefit by printing technique during application of a design print. In this way, different types of tilting images are generated.

4 shows a photo of a detail of a lens structure 4 with a surface to be measured according to the invention 26 , a so-called Region of Interest (ROI).

The area to be measured 26 can take any suitable form. Here a square shape was chosen. A round or polygonal or asymmetrical shape can be used for the area to be measured 26 also be selected if this meets the requirements for a measurement to be performed.

LIST OF REFERENCE NUMBERS

2

carrier

4

lens structure

6

bracket

8th

engine

10

light source

12

optical recording device

14

Data processing device

16

test pattern

18

Area with black and white squares

20

wedge

22

black stripe

24

white stripe

26

area to be measured, region of interest (ROI)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2010/043443 A1 [0014]

Cited non-patent literature

• ISO 7810 [0076]

Claims (16)

Device for checking the quality of a tilted image of a lens structure ( 4 ) mounted on a support ( 2 ), characterized in that the device comprises - a holder ( 6 ), for fixing the carrier ( 2 ), - a motor ( 8th ) to the bracket ( 6 ), - a light source ( 10 ) to the lens structure ( 10 ), - an optical recording device ( 12 ) to at least one image of the lens structure ( 4 ) during the rotation of the holder ( 6 ), - a data processing device ( 14 ) to at least one of the optical pickup device ( 12 ) evaluated image with regard to its color values and the engine ( 8th ) to control. Device according to claim 1, characterized in that the engine ( 8th ) is a stepper motor to the bracket ( 6 ) gradually to rotate by a defined angle. Device according to one of claims 1 to 2, characterized in that the device has a shield against extraneous light. Device according to one of claims 1 to 3, characterized in that at least the holder ( 6 ) and / or the light source ( 10 ) and / or the optical recording device ( 12 ) are arranged so that a distance and / or an angle to the lens structure ( 4 ) are variably adjustable. Device according to one of claims 1 to 4, characterized in that the optical recording device ( 12 ) is a microscope. Device according to one of claims 1 to 5, characterized in that the light source ( 10 ) produces a white or a colored light. Device according to one of claims 1 to 6, characterized in that the carrier ( 2 ) is a portable data carrier. Method for checking the quality of a tilted image of a lens structure ( 4 ) mounted on a support ( 2 ), characterized in that the method comprises at least the following steps - fixing the carrier ( 2 ) on a holder ( 6 ), - turning the holder by means of a motor ( 8th ), - illuminate the lens structure ( 4 ) with a light source ( 10 ), - take at least one image of the lens structure ( 4 ) during the rotation of the holder ( 6 ) by means of an optical recording device ( 12 ), - evaluating the at least one of the optical recording device ( 12 ) with regard to its color values and controlling the motor ( 8th ) by means of a data processing device ( 14 ). Method according to claim 8, characterized in that at least one field to be measured ( 26 ) in the lens structure to be tested ( 4 ) is defined. Method according to one of claims 8 to 9, characterized in that at least two fields to be measured ( 26 ), the fields ( 26 ) are equal or different in size. Method according to one of claims 8 to 10, characterized in that at least one test pattern ( 16 ) into the lens structure ( 4 ) is introduced. Method according to claim 11, characterized in that the test pattern ( 16 ) comprises at least two surfaces which have the same or different color values. Method according to claim 11, characterized in that the test pattern ( 16 ) comprises at least two surfaces which are the same or different in size. Method according to one of claims 11 to 13, characterized in that the test pattern ( 16 ) by means of a laser into the lens structure ( 4 ) is introduced. Method according to one of claims 8 to 14, characterized in that over all images which during a rotation of the holder ( 6 ) of the lens structure ( 4 ) for at least one surface to be measured ( 26 ) and / or test patterns ( 16 ) the color values are evaluated. Method according to one of claims 8 to 15, characterized in that at least one image of the lens structure ( 4 ) is recorded per one angular position to be determined during the rotation.

Images