WO2013057279A1

WO2013057279A1 - Method for verifying a security document having a pattern, using a display device

Info

Publication number: WO2013057279A1
Application number: PCT/EP2012/070803
Authority: WO
Inventors: Olga Kulikovska; Olaf Dressel; Jörg Fischer
Original assignee: Bundesdruckerei Gmbh
Priority date: 2011-10-19
Filing date: 2012-10-19
Publication date: 2013-04-25
Also published as: DE102011084819B4; DE102011084819A1

Abstract

The invention relates to a method for verifying a security document (1), comprising the following steps: operating a display device (4) on the display area (3) of which a first pattern (101) is represented, arranging, in front of the display area (3) representing the first pattern (101), a security document (1) which comprises a second pattern (102) composed of transparent and non-transparent or differently transparent second pattern elements (121), graphically detecting the second pattern (102) stored in the security document (1) in the transmitted light of the graphic representation of the first pattern (101) on the display area (7), evaluating the combined pattern (103) resulting from the graphic detection and deducing a verification decision therefrom.

Description

Method for verifying a security document with a pattern under

Use of a display device

The invention relates to a method and a system for the verification of

Security documents that allow security documents to be authentically checked for authenticity and / or integrity. More particularly, the invention relates to a method for verifying security documents comprising a pattern that can be verified in a transmitted light.

Security features are understood to mean all features which make it impossible or at least significantly complicate the imitation, falsification, duplication or unauthorized production of an object. A document which has at least one security feature is called a security document.

Security documents include, for example, identity documents, such as identity cards, passports, identification cards, access cards, but also driving licenses, visas or documents of value such as banknotes, securities, postage stamps, customs stamps and

The same, just to list a few. Also seals and labels for authenticating the authenticity of products or security features against counterfeiting or falsification protected tickets and the like are called

Considered security documents. Both a material texture, a combination of different materials, a special printing, an introduction of

diffractive, reflective structures and the like can be used as security features. Other security features may be formed, for example, by means of an integrated microchip, a magnetic stripe, or other materials having certain physical or chemical properties, such as a luminescent characteristic or the like.

An essential function of security features is to offer a possibility to determine a genuineness and / or authenticity of the security feature itself as well as of the security document in which the corresponding security feature is integrated. Such a procedure is called verification. Here, the authenticity and / or integrity of the security feature and / or the

Security document checked. In addition to a verification of authenticity and / or

In the integrity of a security document, individual security features, in particular those in which information is stored, can be used to obtain a security information parent verification of the security document or control of a person associated with the security document. A simple example of this is, for example, a serial number integrated in a passport, which can be used after a read-out in order to determine via a comparison with a database in which stolen passports are registered, whether the pass which is being verified, belongs to the stolen reported passes or not. It is understood by those skilled in the art that even more complex verification measures or more complex

designed features can be used for such verifications.

Features that can be read out by a human person without the aid of further technical aids from the security document or can be checked directly for their authenticity and authenticity, are referred to as so-called Level-1 security features. Features requiring technical aids for review are referred to as Level 2 features.

The object of the invention is therefore to provide a verification method and a verification system, with which an improved verification by exploiting widespread objects is possible.

Basic idea of the invention

The invention is based on the idea to display a graphic information on a display device and in front of the display area a value and / or

To arrange security document. Subsequently, a graphic image is recorded, the graphic image is evaluated and from this a verification decision is derived.

definitions

A security feature is a feature that makes it difficult or impossible, or at least makes its manipulation recognizable, an imitation, falsification or unauthorized production of an object in which the security feature is incorporated or in which this is formed. A see-through security feature is a security feature that has one or more transparent or translucent areas. A captured graphic image of the transparent or translucent areas is thus dependent on what is on the side facing away from the viewer of the see-through security feature.

Security documents are all those documents that include at least one security feature, typically a variety of security features.

Security documents include, for example, personal documents such as passports, identity cards, access cards, identification cards, driving licenses, but also bank cards, credit cards, visas or the like, just to name a few.

Security documents, which additionally embody a value, are also referred to as value documents. Security documents, which at the same time represent value documents, are, for example, banknotes, postage stamps, securities, entry tickets secured with security features or the like. A precise delimitation of the subgroup of value documents is sometimes difficult. In terms of what is described here, such delineation does not matter. All value documents are also security documents according to the definition given here.

A display device in the sense of what is described here is a device which can generate a graphic representation on a display surface. Here is the

Display device designed so that different information contents can be displayed one after the other at the same presentation positions. Such a display device is also referred to as a freely programmable display area, since the information content, which is displayed at a display position, can be selected freely, for example via program-controlled image data generation. Television screens but also computer screens, matrix-type LCD, TFT, LED, OLED screens or the like are display device in the sense of here

Described. Furthermore, visualization devices of mobile phones,

Personal digital assistant (PDA) or similar display devices in the sense of what is described here. The first pattern referred to here is the pattern that is displayed on the display device. The second pattern is the one in the security features

referred stored patterns that are graphically detectable.

Graphically detectable is an information that is imaged with an imaging method and can be imaged by means of an image analysis. Alphanumeric or graphical symbols, as well as pieces and product codes, are examples of graphically gatherable information.

As a pattern, a graphical representation is called, which consists of individual

Pattern elements is composed. The individual pattern elements of a pattern may in this case be identical, for example have an identical geometric structure, for example circular, square, rectangular, elliptical, star-shaped, trapezoidal, triangular or the like. However, pattern elements can also be

Punctures, breakthroughs, transparent surface parts of an otherwise opaque surface or the like. Pattern elements may also be identical or different with respect to other optically or graphically detectable properties. Several pattern elements relative to each other on one or in one

Security document body are formed together form a pattern. Also, same color-invading and identical-brightness pixels of a display area of a display device thus form a pattern.

A pattern of a see-through security feature must thus comprise pattern elements that are different from a "background" or relative to each other

Have transparency or translucency.

A grid is a pattern in which individual pattern elements have a regular order relative to one another. At regular intervals to each other arranged pixels of a display device, for example, represent a display grid. A graphical representation of pattern elements that show a viewer no regular impression in terms of their arrangement and design, but can be arranged regularly in such a way that a graphically not shown virtual grid of presentation positions exists at which the individual

Pattern elements are shown. A grid may have a regularity along a spatial direction or, more preferably, along two non-collinear ones Have spatial directions, particularly preferably perpendicular to each other spatial directions. Grids represent visualizations of exemplary grids, whereby, for example, simple geometric structures can occur as elementary cells of such grids. For example triangles, rectangles or squares. The vertices of such simple geometric structures, eg. For example, represent raster positions of the grid represented by the respective grid.

A quasi-raster is a pattern to which a virtual regular raster is assigned, wherein a plurality of the display elements of the pattern are arranged according to the raster positions of the associated virtual raster and only a minority of raster elements are arranged at different positions.

Preferably, the pattern elements that make up the quasi-raster are the same

is composed, each other or even identical. Examples for this are:

- lines that are all formed parallel in the quasiraster,

- microperforations of the same cross-section,

Microlenses of the same focal length and of the same diameter,

- etc.

Preferred embodiments

A method for verifying a security document is proposed, comprising the steps of: operating a display device on the display surface of which a first pattern is displayed, arranging the security document comprising a second pattern of transparent and non-transparent or differently transparent second pattern elements in front of the display surface the illustrated first pattern, graphically capturing the second pattern stored in the security document in the transmitted light of the generated on the display surface of the first pattern or the light remitted thereon, evaluating the total pattern yielded during graphical detection and deriving a

Verification decision. A stored in the security document second pattern, which is verifiable in transmitted light, is thus viewed in transmitted light prior to the graphical representation of a first pattern on the display surface of a display device. In general, the display device will be designed so that it actively emits light in the representation of the pattern on the display surface. For some

However, embodiments of the display device may be passive in nature be designed so that this actively emits no light. For example, some liquid crystal displays may be formed so that their patterns in a

Reflected light illumination in the form of light and dark pattern elements becomes visible. If such a pattern is illuminated on a display surface designed in this way, the pattern stored in the security document can be viewed through the

Security document due to the remission of incident on the display surface radiation is considered and detected. With a suitable configuration of the first pattern relative to the second pattern, an observable alphanumeric character or a simple geometric figure is created in the overall pattern. In order to derive the verification decision, the overall pattern thus becomes one or more

alphanumeric characters searched and / or a simple geometric figure. As simple geometric figures, rectangles, squares, circles,

regular polygons, for example, multi-pointed stars or the like conceived.

Advantage of the invention is that with a simple tool, here one

Display device, a verification of a feature of a security document is possible.

In an embodiment it can be provided that the first pattern displayed on the display surface is generated in response to a detected identifier or retrieved from a database. For this purpose, it can be provided that an identifier, which is assigned to the security document to be checked, is detected. The identifier may be, for example, a serial number indicated on the security document in a human readable manner. Likewise, however, the identifier can also be stored in the form of a bar code, a dot pattern or electronically, for example stored in a microchip.

In some embodiments, it is contemplated that to retrieve the first pattern in addition to the identifier, a personal identification number (PIN) is needed, which is detected in addition to the identifier. This PIN is not stored in the security document and is known only to the person who has to verify it

Security document is assigned. By linking to a PIN, it can be ensured that the security document can be made only in the presence of or in the knowledge of the person to whom the security document is assigned. This For example, it is desirable if the verification for authentication of a person assigned to the security document is performed during a payment process.

In a preferred embodiment of the invention, the overall pattern is examined for the presence of a moiré effect. A moiré effect occurs when superimposing patterns having pattern elements arranged in accordance with a raster or quasi-raster. In this case, it is not absolutely necessary that each grid location of the grid is also assigned a pattern element in each case. For example, a moire effect occurs when the first pattern and the second pattern

Pattern members which are arranged with respect to a first grid and a second grid, wherein the grid are the same or slightly different from each other. Likewise, a moiré effect occurs when the one grid has distances that correspond to a multiple of corresponding distances of the other grid. The verification decision is made based on the presence or location of a moiré effect.

Since different display devices can be used to verify the security document, it is provided in one embodiment that a

Scaling and / or displacement and / or rotation of the first pattern is carried out relative to the second pattern and resulting overall patterns are evaluated successively. Scaling can be done by a different size representation on the display device or by varying a distance of the security document to the display surface. As a result, the geometrical changes for a detection device assumed to be punctiform

Imaging conditions such that there is a scaling of the first pattern relative to the second pattern stored in the security document in the

Transmitted light observation or detection comes. The rotation and / or displacement can also be effected by a modified representation of the first pattern or by a corresponding movement of the security document in front of the display surface. Moire patterns depend on the interrelation of two patterns, so that when moving, rotating, or scaling, changes in the captured moire pattern occur in the overall pattern. This makes it possible to assign structures occurring in the overall pattern to the moiré effect. Observable structures that do not change as the patterns change relative to each other indicate that these structures are not due to the Moire effect. In one embodiment, the first pattern elements of the first pattern are only black or white and the second pattern elements are only colorlessly transparent, gray or black, and the overall pattern is examined for the presence of a color effect. In a human viewer can through the moire effect

Color impressions are caused. The basis for the verification decision can thus be the finding of a colored moiré effect.

In order to perform a verification of a security document, in a preferred embodiment, the first pattern is displayed with a uniform grid structure along a first direction associated with the display area

To verify security document with a second pattern having a pattern having a regular grid structure along a second, associated with the security document direction.

In a preferred embodiment, the second pattern is designed such that information is stored in it which, together with a correspondingly adapted first pattern, are perceptible in the overall pattern if it is superimposed and characterize the person to whom the security document is assigned. For example, the overall pattern gives an indication of the date of birth or else a biometric feature.

In one embodiment of security documents, microperforations (also referred to as microperforations) are formed which collectively form the second pattern. The microperforations are thus pattern elements of the second pattern. In the area of microperforations, the security document is transparent or translucent. The microperforations in some embodiments are formed only in the opaque layers of the security document so that they are covered at least by an upper and lower closed transparent or translucent layer. This prevents soiling or inadvertent or intentional "clogging" of individual microperforations. However, the microperforations can also penetrate the entire document body. The microperforations are preferably arranged such that at least one pattern, preferably a regular grid, exists, which is displayed on the display device, so that in the resulting overall pattern when looking at the security document in the Transmitted light of the first pattern results in an overall pattern in which individual microperforations emerge graphically. This graphically prominent

Microperforations represent information stored in the security document.

In a preferred embodiment, another pattern, preferably a regular grid, is shown subsequently on the display surface of the display device, which is such that upon viewing the suitably formed second pattern in transmitted light, a further overall pattern results in the micro-perforations again highlighted are recognizable, so that one of the

Information various other information can be seen, which is used together with the information to derive the verification decision. Thus, in the security document or in the microperforations or by means of the microperforations, two different information contents, here referred to as the information and the further information, are stored. Looking at the

Security document in transmitted light when viewed in front of a display area

Display device is arranged, the information and the second information can be made visible, if appropriate on the display surface two

different first patterns are shown, preferably each one

represent a regular or quasi-regular grid, and a graphic

Highlighting different microperforations in the resulting overall pattern. The different first patterns can be at one

Embodiment also be displayed simultaneously at different locations of the display area.

In another embodiment, the first pattern is displayed on the display surface of the display device and the security document is moved, translated, rotated and / or scaled relative to the first pattern (eg, by changing the removal of the security document from the display surface) to match the first Pattern with the pattern stored in the security document. If such a pattern match can be brought about, this can lead to a positive verification decision, but if a match can not be achieved, then a negative verification decision is made.

Are shown on the screen, ie on the display surface of the display device successively different first pattern, which is adapted to a verifying second pattern in the security document, it is possible to create different graphically prominent information in the resulting overall patterns. This makes it possible to create dynamically changing information or graphic impressions. This is possible, for example, with embodiments of security documents in which the second pattern is formed by microperforations aligned in a virtual grid, preferably in two mutually orthogonal spatial directions. Separate

Microperforations may be positioned differently from the regular grid locations so that they emerge depending on the pattern displayed on the screen and represent the perceptible information. Depends on the

Design of the first pattern so different microperforations can emerge graphically, so that the different information contents can be highlighted in the second pattern for visibility.

It is understood that more than two pieces of information can also be stored in a pattern.

The invention will be explained in more detail by means of embodiments with reference to figures. Hereby show:

Fig. 1 is a schematic representation for explaining a Verifikationsablaufs;

Fig. 2 shows another embodiment for illustrating a

Verification process;

Fig. 3 is a schematic representation of a verification system for a

Security document with a visual security feature to

Illustrating a verification process;

4 to 6 different, resulting from the superposition of two patterns having a moire effects overall pattern;

Fig. 7 is a schematic representation of a security document whose

See-through safety feature formed by micro perforation; Fig. 8 is a schematic view in which the security document of Fig. 7 is arranged in front of a pattern displayed on a display surface;

9 is a schematic view of a security document, which is a

See-through safety feature with a pattern formed as a quasi-raster;

FIG. 10 shows a schematic illustration of the security document according to FIG. 9 in front of a display area; FIG.

Fig. 1 1 to 13 three views that arise when a on the display surface

changed pattern is changed; and

Fig. 14 is a schematic representation of a verification in which the first pattern and the second pattern are apparently randomly arranged, but in the overlaying of the overall pattern, perceptible information emerges.

With reference to Fig. 1 will be explained how a verification of a

Transparent security feature 2 in cooperation with a display device 4 takes place. A security document 1, which comprises a see-through security feature 2 in the illustrated embodiment, is placed in front of a display area 3 of FIG

Display device 4 is arranged. The display device 4 may be

For example, to act on a common computer screen on which targeted, for example, software-controlled, content can be displayed. The

However, the display device may also be a display of a mobile phone, a personal digital assistant or a digital camera or the like. For example, a graphic 5 is controlled on the display surface 3 via a computer 5. The graphic image that can be displayed on the display surface 3 includes a first pattern 101 for a verification of the security document 1 or of the document contained therein

See-through security feature 2.

The see-through security feature 2 comprises a second pattern 102, which comprises at least transparent or translucent pattern elements. The second pattern 102 may be formed by, for example, partially printing, for example, parallel lines a transparent film is produced, which is joined together with other films to a document body, at least in the area of

Transparency security feature are transparent. In some embodiments, the second pattern 102 may be formed by microperforations formed in, for example, an inner opaque layer. Preferably, the perforated opaque layer is laminated between further transparent layers in a security document body.

If the security document 1 is arranged in front of the display area 3, the first pattern 101 shown on the display area is located in the region of

See-through security feature 2 whose detectable graphical image influences. During verification, a total pattern is thus detected, which consists of the "overlaying" of the first pattern 101 shown on the display surface 3 and that in FIG

Security feature 2 formed second pattern 102 is formed. By way of a suitable choice of the graphic representation of the first pattern 101, adapted to the security document 1 to be verified or its see-through security feature 2, different overall graphic images of the security document 1 or the see-through security feature 2 can be perceived in front of the display surface 3. The captured image, which is detected, for example, with a camera (not shown), is evaluated in a downstream evaluation device, for example the computer 5, in order to make a verification decision.

For simple verification systems, the first pattern 101, which is on the

Display surface 3 of the display device 4 is shown, regardless of the security document to be verified 1 or its see-through security feature 2 in the sense that the same on the display surface 3 illustrated first pattern 101, for example, a regular line grid, for a plurality or all

Security documents 2 can be used to get out of the resulting

Overall pattern of the image of the security document 1 in front of the display surface 3 to derive the verification decision.

A higher verification reliability is obtained with a system which is shown schematically in Fig. 2. In this system, the first pattern 101 shown on the display surface 3 of the display device 4 is dependent on an identifier 10 which is assigned to the security document 1. In the example shown, a Serial number 1 1 used as identifier 10. The identifier 10 is about a

Detected detection device 12. The detection can be optical, magnetic, electronic, for example via a wireless communication from a microchip (not shown). Likewise, the detection device 12 may also be a keyboard via which an input of the serial number is detected. If necessary, an additional personal identification number (PIN) 17 can be recorded. The

Identifier 10 and, if appropriate, the PIN 17 are used to retrieve graphics information associated with the identifier 10 from a database 13, or to be calculated using an algorithm which is implemented, for example, in the computer 5 by means of a program code. On the display surface 3, a graphic representation representing a first pattern 101 is displayed. In front of the display surface 3, as in the embodiment of FIG. 1, the security document 1, which a

See-through security feature 2, arranged. Subsequently, the at least one image is detected, which detects at least a part of the see-through security feature 2 in transmitted light. The captured overall image is detected, for example, by means of a camera 14 and evaluated in the computer 5 or viewed by a user 6, who evaluates the optically detected image and a

Derives verification decision. The verification and derivation of the

Verification decision can be made via a comparison with specifications 15,16, which are shown schematically with the associated Verifikationsentscheidungen in Fig. 2. The evaluation can also be done in the computer 5.

Particularly suitable is the verification method for security features that comprise a pattern constructed from pattern elements, which represent a grid or at least in the majority according to a virtual grid are arranged relative to each other. The verification of such a pattern, which can be a grid (all

Pattern elements are arranged relative to one another according to a virtual grid) or a pattern referred to herein as a quasi-screen, in which at least a majority of the pattern elements are arranged according to a virtual grid relative to each other and a minority of pattern elements different from those through the grid

predetermined positions is arranged with respect to the plurality of pattern elements, can be carried out particularly well by means of a pattern shown on a display surface, which is itself a grid or quasi-grid. This will be explained by way of example with reference to FIG. 3. The graphic representation on the display surface 3 via pixels 1 10. Each pixel 1 10 each three color pixels 1 1 1 to 1 13 are assigned, each one of the primary colors of a

Color system, for example, the primary colors red, green and blue of an additive

Color system, can represent. Each pixel 1 10 can thus represent any color that lies in the gamut, which is spanned by the three primary colors of the color pixels 1 1 1 to 1 13. The individual pixels 1 10 are arranged on the display surface 3 in a regular grid. Along a horizontal line 15, the individual pixels 110 have, for example, a distance R from each other.

Along a vertical axis 17, the pixels in the illustrated embodiment also have the distance R from one another.

It will be understood by those skilled in the art that display devices may be configured differently. Thus, the distances of pixels along a first direction, which is for example referred to as a horizontal, have a first distance from each other and along a second direction, which is for example orthogonal to the first direction and is for example referred to as vertical, have a deviating distance. Likewise, the pixels along a first direction, for example a horizontal, in each case be arranged line by line so that they have the same distance from one another within the respective lines. However, the individual rows can be arranged offset among one another such that the pixels are arranged in a zigzag manner along a second direction, for example, which is oriented perpendicular to the rows of pixels. In principle, it is possible to form many different screens in order to arrange the individual pixels or color pixels of the pixels on a display surface. For the exemplary explanation, it is only important that the pixels 1 10 form a regular grid, which represents the first pattern 101.

The security document illustrated in FIG. 3 includes a see-through security feature 2 that includes a second pattern 102. This second pattern 102 is through

Pattern elements 121 are formed, which are formed in the form of micro perforations 131 in an otherwise opaque layer. The opaque layer provided with the microperforations 131 is preferably an inner layer between transparent ones

Laminated plastic layers in a security document body, which embodies the security document 1. The microperforations 131 or pattern elements 121 are analogous to the pixels 1 10 on the display surface 3 in a regular grid with respect to two with the

Security document 1 or the see-through security feature 2

Spatial directions 125, 127 aligned regularly. With respect to the first direction 125, the pattern elements each have a distance n x R. In the illustrated embodiment, the distances along the second spatial direction 127, which is orthogonal to the first spatial direction 125, are equally spaced from each other, wherein the distance is also nx R, where n represents an arbitrary real number. Preferably, n near 1 is selected , In this case, the pitch of the first pattern 101 formed by the pixels 110 on the display surface 3 and the pitch of the second pattern 102 formed by the pattern members 121 in the form of the micro-perforations 131 are approximately coincident. If the security document 1 is now placed in front of the display surface 3 and viewed in the transmitted light of the light emitted or remitted by the pixels 110 of the first pattern 101, a detection device 130 detects the superposition of the first pattern 101 and of the first detected second pattern 102 resulting overall pattern. The detection device 130 may be a human eye 132 or any graphic detection device, such as a digital camera 133.

Superimposing two patterns formed as rasters whose characteristic distances of the individual pattern elements are the same or similar, i. are in the same order of magnitude, it follows, if the individual pattern elements are not arranged exactly congruent with respect to the detection device and their imaging properties, a so-called Moire effect. This manifests itself in the fact that in the overall pattern, structures or elements emerge graphically that do not derive either directly from the first pattern or from the second pattern, which are superimposed together.

The Moire effect arises when superimposing two patterns, which are similar

Pattern elements, for example, arranged parallel to each other lines, which are arranged according to the same or similar grids. If the patterns on which the patterns are based have the same or similar dimensions, the resulting graphic structures result from a beating of the overlapping spatial frequencies. The underlying rasters are different in terms of theirs Grid characteristic distances strong, so there is no or only a very weak moire effect. If the underlying rasters are very similar or identical in terms of dimensions, strong moire effects occur. In addition to the similarity of the patterns, the underlying spatial frequency also plays an important role. If the distances between the lines are large, there are less beating effects than if the distances between the lines of a pattern are small. Thus, a moiré effect occurs only when superimposing two patterns, if they are adapted to each other accordingly. Thus, the verification decision can be derived from whether or not a moiré effect is observed when viewing the see-through security feature in the transmitted light of the first pattern displayed on the display surface.

In this case, as a rule, a relative displacement of the two patterns is evaluated so that temporally successively detected overall patterns are evaluated. For the

Verification decision can also be monitored to the overall pattern, whether from the superposition of the first displayed on the display surface pattern and stored in the see-through security feature second pattern, both of which each only black / white or gray / white ß or gray / clear transparent formed are, a color impression in the resulting overall pattern is caused.

4, 5 and 6 respectively show a first pattern 101 and a second second pattern 102 superimposed thereon and a total pattern 103 resulting from the superimposition, which shows a moiré effect. Since the moiré effect, i. the graphically protruding elements, due to relative deviations of the superimposed patterns from one another, change the protruding graphic structures if the first pattern is changed relative to the second pattern in terms of its positioning and / or its scaling and / or orientation. This can be done, for example, that the first pattern 101 shown on the display surface 3, for example, is scaled in size, moved or rotated.

It is obvious to the person skilled in the art that as the first pattern 101 on the display surface 3 of the display device 4 according to FIG. 3, patterns can be represented which deviate from the pattern or raster in which the pixels are arranged. For example, a simple pattern can be formed in that only every second pixel or every third pixel represents white image information and the remaining pixels each represent black image information. It is also possible, for example Line grid represent, as this is schematically indicated in Figs. 4 to 6. However, the relative change of the first pattern 101 relative to the second pattern 102 can also be easily accomplished by moving the security document 1 and thus the see-through security feature 2 with the second pattern 102 stored therein relative to the display area 3. In this case, for example, the distance x from the display surface and hereby the relative size scaling in the detection of the superimposed patterns 101, 102 can be changed when viewed in transmitted light. Likewise, the security document 1 can be displaced laterally in different directions in planes parallel to the display surface 3, which is here assumed to be planar. In addition, it is possible to tilt the security document about different axes 141, 142, which lie, for example, in a plane parallel to the display surface 3. The corresponding angles are denoted by υ and γ. Moreover, it is possible to rotate the security document 1 about an axis 143 which is perpendicular to the display surface. The angle of rotation is designated by φ. It can be seen that there are many possibilities for effecting the relative orientation of the first pattern 101 and the second pattern 102 relative to one another with respect to the detection in transmitted light. This also changes the resulting Moire effect or the graphical representation of the prominent graphical elements in the overall pattern.

In Fig. 7 is a security document 1 with a schematically

Transparency security feature 2 shown, whose pattern elements 121

Microperforations 131 are. These are arranged relative to a virtual regular grid (not shown) so as to reproduce a face image of a person associated with the security document 1. According to a photograph template, it is determined for the individual grid positions of the virtual grid whether a perforation is executed or not. The resulting pattern 102 thus represents the facial image as personalizing information. In addition to this biometric information, one or more information is stored in the pattern 102 by the fact that individual pattern elements 121 are not formed precisely at the grid positions defined by the underlying virtual raster, but instead slightly different from these grid positions. These deviations are not readily apparent upon inspection of the security document and a simple visual inspection

perceive. As shown in FIG. 8, this security document 1 according to FIG. 7 is now arranged in front of a display surface 3 of a display device, on which a first pattern 101 is displayed. This first pattern 101 is designed as a raster or quasi-raster, so that via a moiré effect those microperforations 131 emerge, via which the additional information is stored in the second pattern 102 of the security document 1. In the illustrated example, microperforations 131 'appear, which in their entirety represent the number "20." The additional stored information is thus the number "20".

FIG. 9 diagrammatically shows a further security document 1 with a see-through security feature 2, which comprises a pattern 102 designed as a raster or quasi-raster.

As shown in FIG. 10, according to FIG. 9, this security document 1 can be arranged in front of a display surface 3, a display device 4 on which different first patterns 101, 101 'are displayed graphically at different locations or at different times. The patterns 101, 101 'represent different quasi-rasters. This means that the two different illustrated patterns 101, 101' comprise a plurality of pattern elements, for example lines, of which a plurality of raster positions are arranged, which are based on a pattern underlying the pattern Grid are fixed. A minority of the pattern elements are arranged at positions other than the raster. This information is stored in the first two patterns 101, 101 'different information. By overlaying with the second pattern 102 of the see-through security feature 2, these different stored information are observable in the form of graphically protruding elements. In the example shown, this information is shown schematically as A and B, which contain the information stored in the first pattern 101 or 101 '

symbolize. Similarly, in another embodiment, it is possible to form the pattern stored in the see-through security feature as a quasi-raster in which one or more pieces of information are stored. By overlaying with different first patterns, which may be raster or quasi-rasters, the information stored in the security document can thus be made visible in an analogous manner. If a plurality of such information is stored in the see-through security feature 2, dynamically moved information can be made visible on the display surface 3 via a temporal change of the first pattern 101 -1, 101 -2, 101 -3. This is shown schematically in Figs. 1 1 to 13, in which a stored information shown as arrow 150 with the change of the pattern representation on the

Display area 3 counterclockwise in the three successive

Views are rotating.

Different information can be stored both in the first pattern and in the second pattern that emerge in an overall pattern.

In a further embodiment according to FIG. 14, the first pattern 101, which is shown on the display surface 3, comprises irregularly arranged

Pattern elements 121, for example in the form of circular representations. For example, the second pattern 102 stored in the see-through security feature 2 also includes circular microperforations 131 that are similar in size to the circular representations on the display surface. Also, the pattern elements 121, i. the microperforations 131 are apparently irregularly distributed over the area of the see-through security feature 2. However, due to a superimposition of the first pattern 101 with the second pattern 102 in the correct manner, this results in FIG

Overall pattern 103 perceptible information 160, for example in the form of alphanumeric characters or simple graphical symbols or images, which can then be used to derive a verification decision. In the example shown, the lettering "valid", which indicates that the

Verification check is successful. If the security document 1 can not be arranged on the display surface 3 in front of the first pattern 101 in such a way that the word "valid" results, the verification of the security document has failed.

It will be apparent to those skilled in the art that only exemplary embodiments are described and the individual features described in the different embodiments can be used together in different combinations to implement the invention. LIST OF REFERENCE NUMBERS

1 security document

2 see-through security feature

3 display area

4 display device

5 computers

10 identifier

11 serial number

12 detection device

13 database

14 camera

15, 16 specifications

17 PIN

101, 101 '101-1, 101-2, 101-3 first pattern

102 second pattern

103 overall pattern

110 pixels

111-113 color pixels

115 horizontal

R grid spacing

117 vertical

121 pattern elements

125 first spatial direction

127 second spatial direction

130 detection device

131 microperforations

131 'prominent microperforation

132 eye

133 digital camera

X distance display area - security document

141, 142 axes

150 arrow

160 perceptible information

Claims

claims

1 . Method for verifying a value or security document (1) comprising the steps:

Operating a display device (4), on the display surface (3) of which a first pattern (101) is displayed,

Arranging a security document comprising a second pattern (102) of transparent and non-transparent or differently transparent second pattern elements (121) in front of the display surface (3) with the illustrated first pattern (101),

graphically capturing the second pattern (102) stored in the security document (1) in the transmitted light of the graphical representation of the first pattern (101) on the display surface (3),

Evaluating the overall pattern resulting from the graphical acquisition (103) and deriving a verification decision,

wherein the detected overall pattern (103) indicates presence or absence

Emerging alphanumeric characters and / or simple geometric figures is evaluated, which neither in the first pattern (101) nor in the second

Pattern (102) are recognizable in a single, not superimposed acquisition.

2. The method according to claim 1, characterized in that the overall pattern

(103) is examined for the presence of a moiré effect.

3. The method according to claim 1 or 2, characterized in that the first

Pattern elements (121) of the first pattern (101) are only black or white and the second pattern elements (102) are only colorless transparent, gray or black, and the overall pattern (103) is examined for the presence of a colored moiré effect.

4. Method according to one of the preceding claims, characterized in that a scaling and / or displacement and / or rotation of the first pattern (101) relative to the second pattern (102) is carried out and the resulting overall pattern (103) successively be evaluated.

5. The method according to any one of the preceding claims, characterized in that the first pattern (101) is shown with a along a with the display surface (3) associated first direction (1 15, 1 17) uniform grid structure adapted to an expected second Pattern (102) is selected that has a regular grid structure along a second direction (125, 127) associated with the security document (1) so that at least one expected moiré effect is detectable.

6. The method according to any one of the preceding claims, characterized in that the first pattern (101) is displayed so that in this one

personal information associated with the person associated therewith, in turn, with the security document (1) in which the second pattern (102) is stored, with which, when superimposed on the first pattern (101), in the total collected pattern ( 103) an emergence of the stored personal information (160) is effected.

7. The method according to any one of the preceding claims, characterized in that on the display surface (3) of the display device (4) at least two different first pattern (101, 101 ') are shown and the

Overlays of the second pattern (102) stored in the security document (1) are viewed and evaluated in view of the at least two different first patterns (101, 101 '), the at least two first patterns (101, 101') being displayed in this way, that in the resulting overall patterns they cause a presence of different information or an appearance of the different information stored in the second pattern (102), whose presence or emergence upon detection in transmitted light without overlaying with one of the first patterns (101, 101 ') is not recognizable.

8. Method according to one of the preceding claims, characterized in that the first pattern (101) is represented as a raster or quasi-raster adapted to a second pattern (102) to be verified, in which the transparent pattern elements (121) are microperforations (131) are formed, and the first pattern (101) alone does not represent graphically detectable information, and the microperforations (131) additionally so individual ones of the microperforations (131 ') emerge graphically in the overall pattern (103), and the graphically protruding microperforations (131') represent information that is graphically detected and used to derive the verification decision.

9. The method according to claim 8, characterized in that the

Security document (1) additionally detected in front of another first pattern (101 ') and the resulting further overall pattern, then evaluated whether again graphically highlighted microperforations (131') recognizable and another of the one information (160) different information is recognizable , which is used together with at least one piece of information to derive the verification decision.