WO2013057278A1

WO2013057278A1 - Method for verifying a security document using a display device

Info

Publication number: WO2013057278A1
Application number: PCT/EP2012/070802
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: DE102011084820A1

Abstract

The invention relates to a method for verifying a security document (1), comprising the following steps: operating a display device (4) such that the display area (3) gives a graphic representation, arranging, in front of the display area (3), a security document (1), detecting a graphic representation of the security document (1) in front of the display area (3), evaluating the graphic representation and deducing a verification decision therefrom.

Description

Method for verifying a security document using a security document

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.

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 cards such as identity cards, passports, identification cards, access cards, bank / credit cards,

Health cards, but also driving licenses, visas or documents of value such as banknotes, securities, postage stamps, customs stamps and the like, just to name a few. Also seals and labels for authenticating the authenticity of products or protected by security features against counterfeiting or falsification

Tickets and the like are considered as 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, magnetic stripe, or other materials that may be of a particular physical or chemical nature

Have properties such as a luminescent property 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 use them to obtain a higher-level verification of the security document or a security document Control of a person associated with the security document. A simple example of this is, for example, one integrated into a passport

Serial number which can be used after a readout to determine, via an alignment with a database in which stolen passports are registered, whether or not the pass which is being verified belongs to the passports reported as stolen. It goes without saying for the expert that even more complex

Verification measures or more complex features for such

Verifications can be used.

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 evaluated and from this an information for a

Derived verification distinction and / or the verification decision.

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 in the volume of the feature including the side facing away from the viewer

Transparency security feature is located. This can be done in different ways

Embodiments be both reflective objects and transmissive light sources

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 and telephone displays, matrix-type LCD, plasma, OLED, TFT screens or the like are

Display device in the sense of what is described here.

The first information mentioned here is the information given on the

Display device or stored in the graphical representation are. The second information refers to the information stored in the security features, which can be graphically recorded.

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.

Information that can be cognitively referred to is graphically represented information which can be detected, for example, by a human observer and offers a type of information representation known from his living environment, for example alphanumeric characters or symbols, pictograms or complementary image components, each one for a human To represent users of recordable information content.

Preferred embodiments

Proposed is a method for verifying a value or

Security document, comprising the steps of: operating a display device so that a graphical representation is displayed on the display surface thereof,

Arranging a security document in front of the display area, capturing a graphic image of the security document in front of the display area and evaluating the graphic image and deriving verification information and / or a

Verification decision. The verification information is derived by the combination of the graphical image generated on the display surface and the graphical information already stored on the value or security document. The

Verification information may in some cases already "constitute or include" the verification decision. Such a case occurs when the verification decision is dependent, for example, on whether cognitively detectable information can be derived from the graphical representation. In some of these embodiments, the cognitively detectable verification information indicates the verification decision on the cognitively-recognizable content, which indicates the content "valid" or "correct" or "like" or the like, for example, if correctly verified. However, the verification information may also be information that is the basis for a calculation method or the like, the result of which provides the verification decision. An example would be derived from the captured graphic image identification number, which can be used for example in a payment method analogous to a known from the prior art PIN a bank card. Generally, this enables reliable verification.

Higher verification reliability and security can be achieved by individually generating or retrieving the first information based on an identifier stored in the security document or assigned to the security document and bringing it to the display on the display surface. It is therefore provided that an identifier assigned to the security document is detected, graphic information is retrieved from a database on the basis of the identifier or the graphic information is generated and the graphic representation is made on the basis of the graphics information.

The identifier may be, for example, a serial number in the form of

alphanumeric character is displayed on the security document. This can either be recorded graphically or entered by a verification personnel, for example by means of a keyboard and electronically recorded. Likewise, it is possible to store the identifier in a microchip or otherwise in the security document and to read it accordingly from this by means of suitable technical devices and to use it accordingly. The retrieval of the graphic information can additionally be secured by a personal identification number (PIN). A retrieval is only possible if the detected or entered PIN corresponds to the identifier.

In one embodiment of the invention it is provided that by means of

Display device first information displayed on the display surface and the evaluation of a total information is evaluated, resulting from the first information shown in the figure and the second information shown in the figure, the second information is formed on or in the document. In this case, it may be provided that the first information and the second information complement one another in total information which can be detected, for example, by a human observer and for this one of his

Living environment known type of information representation offers, for example

alphanumeric characters or symbols, pictograms or complementary ones Image components that represent an information content that can be captured by a human user. For example, the first and second pieces of information may each represent portions of alphanumeric characters that are taken in themselves

Recognize these alphanumeric characters are not possible or difficult to perceive. If the security document is correctly placed before the

Display area and a correspondingly scaled the graphic information shown so the first information, d. H. fragmentary alphanumeric characters with those in the security document

stored second information, which complementary fragmentary

Alphanumeric characters to which add up to the overall information, which now represents complete alphanumeric characters, for example, for a

human observer or for an optical character recognition device (OCR device) can be detected and evaluated. It is understood that fragmented alphanumeric characters represent only an exemplary embodiment for the first and second information.

Such supplementing of the first and second information is possible, for example, with security documents that include a transparent or translucent area. In one embodiment, it is therefore provided that at least a section of the surface of the security document is detected, in which a

translucent or transparent area of the security document is expected or developed. Such a translucent or transparent area thus constitutes a see-through security feature of the security document, which can be easily verified in cooperation with a display device. If the security document is correctly positioned in front of the display area and the

Representation of the first information on the display surface, these are, if necessary, modified by properties of the translucent or transparent area, together with the information stored in the security document perceptible and complement each other to the overall information, which is evaluated for verification.

In one embodiment, neither the first information displayed graphically on the display surface nor the second information stored in the security document represents cognitively detectable information. However, in the overall information of the captured graphical image, cognitively detectable verification information results. This allows for easy verification. The thus-derived verification information can be used as a PIN in a payment process or identification process or be compared with a comparison information stored in the security document to a

Derive verification decision. Is the verification information on?

alphanumeric code, this may be combined with a e.g. readable on the

Security document printed code. If the codes match exactly or within a given tolerance, the security document, for example, is verified as genuine and otherwise as unreal or falsified.

In some embodiments, a subset of a set of principally cognitively detectable characters is highlighted in the overall information. This subset then represents the verification information.

However, such an evaluation of the overall information is also possible in embodiments of security documents that have no transparent or translucent area. Therefore, it is alternatively or additionally provided that the positioning of the security document in front of the display area and the capture of the graphic image take place such that along at least one outer edge section of the

Security document both at least a portion of the security document as well as an uncovered section of the graph on the display surface are detected and / or, if the security document comprises at least one translucent or transparent area whose image in the captured image can be influenced by the graphical representation on the display area is, at least a portion of the translucent or transparent area is detected in front of the display area. Thus, uncovered areas of the display area and first information displayed thereupon may supplement with second information stored in the security document. For example, arbitrarily shaped line elements, which are led to the edge of a see-through area, which is transparent or translucent, or to an edge of the security document, may be complementary to the elements displayed on the display area and immediately (adjacent to the edge of the security document ) or perceptible through the see-through area. In one embodiment, it is therefore provided that it is checked whether for a

Minimum number of first presentation elements of the first information a steady transition to a second presentation element of the second information exists. A continuous transition is a transition in which one or more with the Graphic elements associated with display elements are equal or matched to one another. These properties or features may relate to a local arrangement of the transitional elements and an environment of the transitional display elements. In this case, it is checked, for example, whether the presentation elements, for example, along the edge of the security document, if it is arranged in front of the display surface, in the resulting overall image at the same local position on each other. Another criterion that can be tested is

For example, an extent, such as a line thickness, if the two display elements are line segments. Likewise, a geometric shape can be checked, for example, if a trapezoidal object is arranged on the security document, then this could be supplemented in its entirety into a triangle by means of a triangular display element, which is shown on the display surface. This would require that the triangular shown on the display surface

Display element visually adapted to geometric shape and size to that of the trapezoid. In the overall picture then results in a triangular

Gesamtdarstellungselement whose side edges, which over the edge of the

Security document "run", continuous stretch sections in the sense of a

mathematical definition of the term continuous for functions, if one considers the resulting side edges of the triangular display element as line elements of a two-dimensional function. It is understood by those skilled in the art that in addition to continuity in the mathematical sense for a line segment that continues beyond the edge of the security document or an edge of a transparent or translucent area, also more extensive criteria with respect to a correct

Supplement to an overall information can be checked.

Furthermore, it is understood that, based on the mathematical definition of the continuity, tolerances can also be predetermined, in which deviations in the transition are output as continuous. In particular, parallax errors due to a finite thickness of the security document should be taken into account. At a

Supplementing two graphic display elements, which represent flat graphic elements, would in the example described above, in which a trapezoidal

Representation element or triangular representation element to a triangular

Representation element of the overall information, not only expected that the line segments forming the boundary of the individual graphical presentation elements meet at the document edge at the same display position, but rather also It would be expected that the two line segments in the overall representation would complement one another to a "straight line without curvature." If the resulting outer contour of an edge of the total triangle were to be considered a line segment of a function, this would be mathematically equivalent to being the first Derivative function acting in the sense of the mathematical definition of

Continuity. Again, tolerances should be provided. For example, a transition can be considered to be continuous if the presentation elements meet below a given distance and their tangents at the edge of the security document or see-through area intersect at the same angle or match those angles within an angular tolerance range. In addition, in a meaningful addition of display elements that show a "steady transition", also their color, presentation texture and the like can be checked.

If, for example, two planar presentation elements of the first and the second information, which each have hatching, are included, it is not only possible to check whether a simple, expected geometric figure results from the addition to the overall information, but also to check whether this is the case resulting overall figure has a uniform planar texture, for example, similar hatching or uniform color.

It is also possible to form the two graphic display elements in each case such that they show a color transition over their areal extent. In such a case, it may be checked whether the resulting overall graphical representation and the graphic surface elements formed therein which extend over the document edge or a boundary of a translucent / transparent area result in a uniform overall color gradient. It will be apparent to those skilled in the art that the various features described herein may be evaluated individually and in combination to determine whether the first and second information complement each other in a consistent manner.

Embodiments in which it is checked whether a plurality of presentation elements of the first information have a plurality of embodiments are particularly preferred

Make sense elements of the second information useful to complete the overall information. For example, if on the display area as first information only one Line element shown, so can by suitable arrangement of the

Security document, on which a line segment is also shown as a second information, a continuous transition of the line elements are achieved, in which the security document is placed under appropriate orientation at a suitable position in front of the display surface. Are however more line elements than

Display elements in the first information and multiple line elements as second presentation elements in the second information, such a match can not be accomplished by a different arrangement and / or orientation of the security document in front of the display surface in the rule. Thus, verification reliability increases significantly when several

Display elements are checked for a meaningful addition.

In some embodiments, it may be provided that the first information needed for verification of security documents is identical for a group or all security documents. By arranging a security document to be verified before then identical for all security documents

Presentation can then easily check the corresponding one

Security document. However, with a verification designed in this way, it is possible, based on a security document in which second information is stored in the form of presentation elements, to generate supplementary first information which would then be meaningfully supplemented with display elements of other security documents. Thus, it would be possible to fake security documents by duplicating the same graphical presentation elements found on a security document.

If verification information is derived from the overall information, which is combined with other features of the security document to derive the verification decision, simple duplication of the second information is not sufficient. Also the one or the other features included in the

The verification decision-making process must then be correspondingly falsified. A uniform stripe pattern as first piece of information can be used to verify various individualized security documents that

For example, each have slightly stepped steps pattern as second information that provide different moire images with the first information in the form of the striped pattern shown on the display surface. Will they join? The verification in the overall information resulting Moire images additionally applied as a comparison pattern or specifications on the corresponding security documents, one simply obtains to be verified individual security documents that are verifiable with the same first information. If the Moire image in the overall information matches the printed Moire image, the verification result is "real", otherwise "fake".

In a further embodiment, it is provided that the resulting color values of image areas of the acquired image are evaluated, on which

transparent or translucent areas of the security document. It can be checked here whether the resulting color values in the overall image correspond to those which are expected in dependence on the illustrated first information.

In a preferred development, it is provided that reference color values for the color values of the transparent or translucent areas are derived from regularities of the color mixture on the basis of color value specifications on the security document and color values on non-hidden sections of the display area. The transparent or translucent areas of the security document can thus be embodied as color filters which, in conjunction with graphical representations on the display surface of the display device, lead to a change in the color values in the total information recorded. In one embodiment, the second information, for example along a border area of the security document, comprises color-formed area elements representing color values corresponding to those to be displayed, for example, in stripes on the display area for verification. In addition, the second information captures a representation of a resulting color pattern or a portion of the color pattern that results in a see-through area of the security document when properly positioned in front of the display area and the color stripes on the display area

Color addition modify the perceptible color values in the area of the see-through window. On the one hand, it can thus be checked whether the illustrated, for example, strip-like pattern on the display surface corresponds to that provided for the verification and, on the other hand, whether the color pattern resulting in the viewing area matches that on the security document represented color pattern corresponds. In other embodiments, only one or more reference patterns are adjacent to the filter

Transparency security feature arranged.

In other security documents, different, mutually different pieces of information are stored in the second information in a look-through area. These are designed so that they are imperceptible when viewed under white light in a graphic image. For example, the

different information shares by means of so-called metameric colors in the security document to be encoded. Stored colored pieces of information are metamer to each other when they are under a human observer

White light illumination conditions produce the same color impression. To

distinguish are the one causing metameric color impression

Information shares in that these different remission or

Have transmission spectra. This means that the information components when viewed in white light cause the same color impression in a human observer due to the color addition and / or color subtraction, but in a wavelength-resolved analysis the information components are distinguishable.

In one embodiment, it is provided that the graphical representation on the display surface is changed at least once and after the at least one

Changing the graphical representation of at least one further graphical image is detected and evaluated, wherein from the captured graphical image stored in a transparent or translucent area of the security document information component is extracted from the at least one other detected graphic image another in the transparent or translucent area the information stored in the security document is extracted, the first stored information component and the further stored information component being different from one another and neither the first stored information component from the further image nor the further stored information component from the graphic image being removable, and the verification decision from the extracted first information component and of the at least one further extracted

Information share is derived. A security document comprising, in a transparent or translucent area, two different pieces of information related to other components of the security document in the see-through area are trained, so other information shares in different

Backlights with different colors through the display area for a

Be highlighted. This makes it possible to create a dynamic for the verification security feature in which by changing the

Backlighting different information are perceptible, so quasi-moving or at least a change having information for the user are perceptible, which are not perceptible as a separate different information in a white light viewing.

The different information can be most easily perceived when the different images are subjected to a color contrast evaluation.

In yet another embodiment, the security feature is designed as an optical filter such that it can be used to visualize information displayed on the display surface that is difficult or impossible to see when viewed without the security document placed in front of the display surface , In one embodiment, it is therefore provided that in the graphical representation on the display surface, an information area is stored, which is not derivable in an immediately, without an auxiliary means arranged image of the display surface, but upon detection of the image by a suitably formed transparent or translucent area of the security document is detectable.

In yet another embodiment, it is provided that the graphical representation is formed on the display surface such that a first information component and a second information component different from the first information component are displayed in at least one planar section simultaneously or alternately, wherein a first filter characteristic exists that corresponds to the first first information component is assigned and a different from the first filter property second

Filtering property associated with the second information component, wherein arranging a filter with the first filter characteristic in the image acquisition comprises extracting the first information component from the image and alternatively arranging a filter with the second filter property before

Display area in the image acquisition, extracting the second Information component from the figure favors, and is determined when evaluating the detected mapping of the information component, which is favored in the at least one area of the graph corresponding area of the image due to the filter properties of the at least one transparent area of the security element with respect to the extraction and the

Verification decision is made depending on the thus determined information component. Thus, different forms of the security feature can be provided in different security documents and different information components in the first information, which is displayed on the display surface, can be stored on the display surface. Depending on which filter property has the security feature, other information components for a detection are highlighted so that the different information components can be extracted from the captured image and used for verification. As an information component, for example, the word valid may be encoded in the information displayed on the display surface. As a second piece of information, the word may be coded invalid. Depending on which filter property of the

Have a look through area of the security document are now the first

Information component that represents the word valid, or the second

Information component which invalidates the word extractable from the resulting overall map. Again, the first pieces of information and the second piece of information can be encoded on the display area by using colors in the graph. By the different ones

Filter characteristics can be filtered out one or more wavelength ranges, so that the perceptible to the viewer information components differ in the resulting figures.

In another embodiment, a plurality of graphical images of the security document are acquired in chronological succession in front of a display device.

A variation of the resulting overall information is evaluated. If the security document comprises, for example, second information printed in a translucent area by means of luminophore or phosphorescent printing inks, these can be excited to luminesce by the light of the representation of the first information on the display area. If luminophores or luminescent colorants with a lifetime or "afterglow duration" in the range of a few seconds are selected, then only a brief presentation of the first information on the display surface becomes a Excitation causes so that the second information light up visibly and then fade.

If the first information is displayed repeatedly for a short time and not in the time intervals between (pauses), the result is a constant illumination of the second one

Information, provided that the repetition frequency of the representation is chosen large enough. The pause intervals are chosen to be shorter than the service life. The

Persistence can be selected, for example, in the range of 6 s to 10 s. The pause interval lengths for a continuous glow can then be selected to be about 1 s.

In yet another embodiment, luminescent substances can be used in which, via the so-called anti-Stokes effect, a luminescence of the second information with luminescence wavelengths shorter than that is achieved

Are wavelengths of light that the display surface transmits when presenting the first information. The evaluation thus includes a color or

Wavelength evaluation for deriving the verification decision.

The invention will be explained in more detail with reference to a drawing. 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 captured image of a

Security document in front of a display area;

4 shows a further schematic representation of a security document in front of a display surface of a display device;

Fig. 5a is a schematic representation of a display surface on which a first

Information is shown; a schematic representation of a display surface, on which a first information according to Fig. 5a is shown, in front of which a security document, which is designed as a see-through security feature, is arranged; a schematic representation of a display surface, on which another first information is shown, in front of which the same security document is arranged according to Figure 5b. a view of a security document, which is arranged in front of a display area, which represents a first information; the view of the security document of Figure 6a in an arrangement in front of a display area, which graphs a different first information. a view of the security document of Figure 6a and 6b when viewed in white light. a schematic representation of a procedure in which an alphanumeric code is derived as verification information, which can be used for example as a PIN for a subsequent financial transaction; and another embodiment similar to that of FIG. 7a, in which also an alphanumeric verification information is derived.

It will be explained with reference to FIG. 1 how a verification of a security feature takes place in cooperation with a display device 4. A security document 1, which in the illustrated embodiment comprises a see-through security feature 2, a display device 4 is arranged in front of a display surface 3. The display device 4 may be, for example, an ordinary one

Computer screen or a mobile phone display on which targeted,

For example, software controlled, content can be displayed, for example, is controlled by a computer 5, a graphical representation on the display surface 3. In principle, any displayable on the display surface 3 graphic image one represent first information for a verification of the security document 1 or of the security document 2 contained therein.

If the security document 1 is arranged in front of the display surface 3, the first information shown on the display surface is displayed in the region of

See-through security feature 2 whose detectable graphical image is affected. This means that the see-through security feature 2 comprises translucent or transparent area shares or areas. In a simple embodiment, the entire see-through security feature 2 is designed, for example, as a transparent color filter. This means that light of at least one wavelength or one

Wavelength range is filtered from a continuous white light spectrum and for that wavelength range that can pass through the color filter, through the

Security feature through an image according to the sets of geometric appearance is possible. For example, characters which are displayed on the screen black against a red background, by a filter that lets red light pass, recognizable and detectable. If, however, a filter in the

Transparency feature 2 is used, which completely filters red light, so the characters are imperceptible, but a uniform dark area is perceived, as long as it is a perfect filter. Through a suitable choice of the graphical representation of the first information, adapted to the

verifying security document or its see-through security feature, different overall graphic images of the security document or the transparent security feature are perceivable in front of the display area. The captured images, which are detected, for example, with a camera (not shown), are evaluated in a downstream evaluation device, for example the computer 5, in order to make a verification decision.

For simple verification systems, the first information available 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 displayed on the display surface 3 first information, such as a homogeneous colored area, for a variety or all

Security documents can be used to derive the verification decision from the resulting image of the security document in front of the display area. For example, in some embodiments, the display device may be a standard TV or mobile phone display that has a white glowing surface, which is used here as a light source with the optical properties typical of these devices for verification.

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

Detected detection device 12. The detection can be detected visually, optically, magnetically, electronically, for example via a wireless communication from a microchip (not shown). Thus, 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 optionally the PIN 17 are used to retrieve a graphical information associated with the identifier 10 from a database 13, or to calculate using an algorithm, which is implemented for example in the computer 5 by means of a program code. On the display surface 3 is displayed a first information representing graphical representation. In front of the display surface, as in the exemplary embodiment according to FIG. 1, the security document 1, which comprises a see-through security feature 2, is arranged. Subsequently, the at least one image is detected, which is at least part of the

Transparency security feature and possibly additionally recorded an uncovered area of the display area and a part of the security document. The captured

Overall image is detected, for example, by means of a camera 14 and evaluated in the computer or viewed by a user 6, who evaluates the optically detected image and derives a verification decision. The verification and derivation of the verification decision can take place via a comparison with specifications 15, 16, which are shown schematically with the associated verification decisions in FIG. 2.

In Fig. 3 is a captured image of a security document 1 with a

See-through security feature 2 in front of a display surface 3 of a display device. 4 shown. On the display surface, a first information is shown, which

comprises different display elements 21 in the form of line segments 22-1 and surface elements 23-1. On the security document 1 are also

Display elements 21 -2, which also line elements 22-2 and

Surface elements 23-2 include. The trailing digit indicates in each case whether it is a component of the first information which is displayed on the display area (1) or is a component of the second information which is stored in the security document 1 (2). The security document includes a

See-through security feature 2, which is designed as a transparent window 24. A remaining area 25 is non-transparent. In a picture of the

Security document, which is arranged in front of the display surface 3, thus a detected image of the remaining area 25 is not affected by the representation on the display surface 3. In the area of the transparent window 24, however, is the first

Information visible in the figure, which on the display surface 3 behind the

Review window is displayed. In the illustration shown in FIG. 3, it can clearly be seen that the individual line segments 22 - 1, 22 - 2 in each case complement edges 26 and window edges 27 to form continuous lines. Both in terms of her

Color design, which is indicated by the type of line (dashed, dotted, solid), as well as their respective lines can be seen that the individual line segments 21 -1, 21 -2 of the first information and the second information seamlessly fit together. Both the locations where the line segments meet the edge 26 of the security document and their direction, ie the angle at which they hit the edge of the card or the edge of the window, are identical or nearly identical, so that in the figure gives the impression of continuous lines. The surface element 23-1a, the first information visible in the transparent window 24, is complementary to the surface element 23-2, which is shown in the nontransparent remaining region 25 of the security document. Together, these complement each other to form a section of a four-pointed star. Although the two remaining surface elements 23-1 b, 23-1 c are also complementary to the surface element 23-2 and the transparent window 24 visible surface element 23-1 a, so that a total of four-pointed star 28 results. It can thus be determined from the illustration of FIG. 3 that the first information, which is shown on the display area 3, is supplemented with the second information, which is stored on the security document, in a total information in such a way that based on the overall information and the resulting geometric figures and lines neither the edges of the Security document, nor the edges of the see-through window emerge. Rather, continuous transitions of the surface elements and line elements, ie in general the display elements of the first information and the second information can be seen.

In Fig. 4 is a schematic view of a security document 1 in front of a

Display surface 3 shown. On the display surface 3 different stripes 31 -1 a to 31 -1 d are shown. The individual stripes convey a homogeneous color impression over their area. The different colors shown are represented by different hatchings. These strips 31 -1 a to 31 -1 d shown on the display surface 3 are adapted to a security document 1, which is arranged in front of the display surface. The security document 1 has

See-through security feature 2, which in the view shown extending perpendicularly shaped tire-shaped color filter 32-2a to 32-2d. The individual strip-shaped filters 32-2a to 32-2d are each transparent. Its color is again indicated by a hatching. The color of the individual filters 32-2a to 32-2d is additionally shown in continuation fields 33a to 33d, which are arranged in a nontransparent area of the security document 1. Depending on the colors selected for the strips 31 -1 a to 31 -1 d, the overlays of the filters 32-2a to 32-2d result in a colored pattern 34 on the security document 1, moreover two reference areas 36, 37 are shown, these show different colored reference patterns 38, 39. The reference patterns are formed in a non-transparent area of the security document 1 and indicate the color values corresponding to two predetermined combinations of the color stripes 31 -1 a to 31 -1 d as viewed through the filters 32-2a to 32-2d. If, for example, the identifier 10 embodied as a serial number is read from the security document, then strips 31 -1 a to 31 -1 d are first displayed on the display surface 3. By doing

Through-window should now give a colored pattern 34, which is the

Reference pattern 38 in the reference area 36 corresponds. Subsequently, the graph changes on the display surface, and other colored stripes 31 -1 a to 31 -1 d are displayed on the display surface 3. Now that results in the

See-through security feature a colored pattern 34, which should correspond to the reference pattern 39 in the reference area 37. If the color patterns 34 detected in chronological succession coincide with the reference patterns 38 and 39, this becomes

For example, security document verified as genuine. So it is possible, only one

Reference pattern on the document or more than two reference patterns on the document Document. It is understood that both the information on the

Display area, as well as the filters in the see-through window other geometric

Embodiments can accept as strips. With a suitable choice of the respective filter properties and the first information shown on the display surface, it is possible that in the transmitted light observation in the resulting colored pattern information, for example in the form of a graphic symbol, a person image or an alphanumeric character is recognizable.

In Fig. 5a is a view of a display surface is shown schematically, on which a first information 41 is shown. No information can be derived from this view.

In Fig. 5b is a security document 1, which as a whole as

Transparent safety feature 2 is formed, arranged in front of the display surface 3, on which the first information 41 is shown. About the filter property of

Transparency security feature 2 specific portions of the graphical representation of the first information 41 are selectively selected, so that in the see-through area information is recognizable. In the illustrated case, a graphic symbol in the form of a cross 42 is recognizable as long as the filter characteristics of the see-through security feature 2 correspond to the first information displayed on the screen.

In one embodiment of the invention results in a change in the graphical representation of a deviating from the first information 41 first information 41 'on the display surface when viewed through the see-through security feature of the same security document 1 different, perceptible information, here

for example, in the form of a graphic symbol formed as a square 43

(compare Fig. 5c). The perceptible information is used to derive the verification decision.

Likewise, it is possible to design a see-through security feature of a security document 1 such that, depending on different first information 41, 41 'displayed on the display surface, different ones in the

Transparent security feature of the security document

Information shares in a captured overall image are highlighted for extraction. In FIG. 6a, for example, the first information component is the number "1". 51 clearly highlighted. In Fig. 6b, the letter "A" 52 is clearly emphasized, and neither the first information component nor the second information component is allowed to be viewed when viewing the see-through security feature 2 with white light

recognize (see Fig. 6c). Also the first shown on the screen

Information 41, 41 'are designed in such a way that neither the first information component nor the second component of the information, when viewed directly, is the subject of the

Display surface emerge and are therefore perceptible. Only when superimposing the see-through security feature 2 in front of the corresponding first information displayed on the display surface, one selects the images shown in FIGS. 6a and 6b, from which the different see-through security features

stored information can be extracted. These different extracted information can now be used to derive the verification decision. For example, the security document 1 can be verified as genuine if both stored information "1" and "A" have been correctly extracted.

In FIGS. 7a and 7b, procedures are schematically illustrated in which an alphanumeric code is derived as verification information. From one

Database 13 is read via a computer 5 an associated to the security document 1 identifier 10, which is used to produce the representation of first information, here for example in the form of a pattern of three circles 61-63. The security document 1 comprises a see-through security feature 2, which comprises recognizable or unrecognizable alphanumeric characters in incident light. If the security document 1 is arranged in a defined manner in front of the display surface 3, a part of the information stored in the transparent security feature 2 is represented by the circles 61 - 63, which represent the first pattern, in the form of

alphanumeric characters when capturing an image visible or highlighted. These characters form an alphanumeric code 64, which is derived as verification information and can be used, for example, as a personal identification number (PIN) or transaction number (TAN) in a subsequent verification process, for example in a payment transaction.

FIG. 7b shows another embodiment similar to that of FIG. 7a, but in which the first pattern represents arrow-like pattern elements 65-67. In the illustrated in Fig. 7b embodiment of the security document 1 are on the

Security document along an edge alphanumeric characters 68 attached. Becomes the security document 1 now arranged in front of the display surface in a defined manner, the arrow-like pattern elements 65-67 to individual of the alphanumeric characters 68. These so marked alphanumeric characters in this case form the alphanumeric code 64, which are used again as a PIN or TAN may be to derive a final verification decision as to whether, for example, a payment process can be performed or a person can be granted access to a protected area. In a further development, the individual arrow-like pattern elements 65-67 can be assigned numbers on the display area that indicate an order of the alphanumeric characters marked by the arrow-like pattern elements on the security document for generating the alphanumeric code 64. Such a modification is also conceivable in the embodiment according to FIG. 7a. It will be apparent to those skilled in the art that further modifications and refinements of the described methods are possible.

It goes without saying for the person skilled in the art that only exemplary embodiments are described here. The features used in the different embodiments may be used to practice the invention in any combination. Other, for example, non-colored overlay effects can also be used, for example a moiré effect or shadow.

LIST OF REFERENCE NUMBERS

1 security document

2 see-through security feature

3 display area

4 display device

5 computers

10 identifier

1 1 serial number

12 detection device

13 database

14 camera

15, 16 specifications

17 PIN

21 presentation element

22 line element

23 surface element

24 (see-through) window

25 remaining area

26 edges

27 window borders

31 strips

32 filters

33 continuation fields

34 colored pattern

36, 37 reference areas

38, 39 Reference pattern

...- 1 indicates ... as part of the first information

...- 2 indicates ... as part of the second information

... a to ... d a to d mark different colored forms of ...

41, 41 'first information

42 cross

43 square

51 "1"

52 "A" -63 circles of alphanumeric code, 67 arrow-like elements of alphanumeric characters

Claims

claims

1 . Method for verifying a security document (1) comprising the

Steps:

Operating a display device (4) such that a graphical representation is displayed on its display surface (3),

Placing the security document (1) in front of the display area,

Capturing a graphical representation of the security document (1) before the

Display area (3), evaluating the graphic image and deriving a

Verification information and / or verification decision,

wherein an identifier (10) assigned to the security document (1) is detected, graphical information is retrieved or generated from a database (13) on the basis of the identifier (10), and the graphical representation is displayed on the

Display area (3) is made based on the graphic information.

2. The method according to claim 1, characterized in that by means of

Display device (4) first information (41, 41 ', ...- 1) are displayed on the display surface and in the evaluation of a total information is evaluated, which consists of the first information shown in the figure (41, 41',

1) and second information (... 2) shown in the figure, the second information (... 2) being formed on or in the security document (1).

3. The method according to claim 1 or 2, characterized in that at least a section of the surface of the security document (1) is detected, in which a translucent or transparent area of the security document (1) is expected or formed.

4. The method according to any one of the preceding claims, characterized in that the positioning of the security document (1) in front of the display surface (3) and the detection of the graphic image is carried out so that along at least one outer edge portion of the security document (1) both at least a section the security document (1) as well as an uncovered section of the graphical representation are recorded on the display surface (3) and / or, if the security document has at least one translucent or transparent region, whose image in the captured image can be influenced by the graphical representation on the display surface (3), at least a section of the translucent or transparent region in front of the

Display area (3) is detected.

5. The method according to claim 4, characterized in that it is checked whether for a minimum number of first display elements (21 -1) of the first

Information a steady transition to a second display element (21 - 2) of the second information exists.

6. The method according to claim 1, characterized in that an identification code is derived from the recorded graphical image as verification information.

7. The method according to any one of the preceding claims, characterized in that in the figure resulting color values of image areas are evaluated, where transparent or translucent areas of the security document (1) are displayed.

8. The method according to any one of the preceding claims, characterized in that the graphical representation on the display surface (3) is changed at least once, and after the at least one change of the graphic

Presentation of at least one more graphic image captured and

is evaluated, is extracted from the captured graphical image, a first stored in a transparent or translucent area of the security document information share and from the at least one other recorded graphic image another stored in the transparent or translucent area of the security document (1)

Information portion is extracted, the first stored

Information portion and the further stored information portion are different from each other and neither the first stored information portion of the further image nor the further stored information portion of the graphic image can be removed, and the verification decision is derived on the basis of the extracted first information component and the at least one further extracted information component.

9. The method according to any one of the preceding claims, characterized in that in the graphical representation on the display surface (3) information (41) is stored, which in a directly, without one before

arranged means of the display surface is not derivable, but upon detection of the image through a transparent or translucent area of the security document (1) is detectable.

10. The method according to any one of the preceding claims, characterized in that the graphical representation is formed so that in at least one planar section at the same time or alternately a first

Information component and a second information component different from the first information component, wherein a first filter characteristic exists which is associated with the first information component and a second filter characteristic different from the first filter property exists, which is associated with the second information component, wherein arranging a filter with the first filter property at the

Image acquisition comprises extracting the first information component from the image and alternatively placing a filter with the second filter property in front of the display surface in the image acquisition

Extracting the second information component from the figure favors, is determined when evaluating the captured image of the information component, which in the at least one planar portion of the graph corresponding area of the image due to

Filtering properties of the at least one transparent region of the

Security document (1) is favored with respect to the extraction and the verification decision depending on the thus determined

Information component is taken.