EP2769364A1

EP2769364A1 - Method for verifying a security document having a visual barrier, using a display device

Info

Publication number: EP2769364A1
Application number: EP12783164.2A
Authority: EP
Inventors: Olga Kulikovska; Olaf Dressel; Jörg Fischer
Original assignee: Bundesdruckerei GmbH
Current assignee: Bundesdruckerei GmbH
Priority date: 2011-10-19
Filing date: 2012-10-19
Publication date: 2014-08-27
Anticipated expiration: 2032-10-19
Also published as: DE102011084818A1; EP2769364B1; WO2013057280A1

Abstract

The invention relates to a method for verifying a value document or security document (1), comprising the following steps: operating a display device (4) the display area (3) of which displays a graphic representation, arranging, in front of the display area (3) with the graphic representation, a security document (1), said security document (1) comprising a security feature including a visual barrier (210) that uncovers, when looked at in the transmitted light at different angles of viewing, different pieces of information present behind the visual barrier (210). The visual barrier (210) is integrated into the security document (1) such that for at least one angle of viewing a view through the visual barrier (210) and through the security document (1) onto a piece of information present behind the security document (1) is possible. The graphic representation comprises at least one first partial image portion (101) for the at least one angle of viewing. The method further comprises the step of detecting at least two images of the security document (1) in front of the display device (4) for at least two different angles of viewing, evaluating the detected at least two images and deducing a verification decision therefrom.

Description

A method of verifying a security document with a visual barrier using 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. In particular, the invention relates to a method for verifying security documents which comprise a visual barrier which allows for a viewing through the security barrier and the security document for at least one viewing geometry.

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

Integrity of a security document may include individual security features, In particular, those in which information is stored can be used to perform a higher level 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 goes without saying

Professional that even more complex verification measures or more complex

designed features can be used for such verifications.

From the prior art security documents are known, which

Include security features that show different graphical images under different viewing geometries. Different imaging geometries may, for example, be defined by different viewing directions relative to a direction associated with and associated with the security document. For example, in a substantially planar security document, a surface normal to the security document may be used as the security document

Reference direction are defined, with respect to which the viewing directions of the security document are defined. For example, security features are known, which are also referred to as tilt images, which are under different

Viewing directions different information reveal. Such

Security features can be implemented differently. For example, holograms or other diffractive structures can be used for this purpose. Other

Embodiments use, for example, microlenses which, under different viewing directions, store different data stored in the document

Map information shares. Such security features are also referred to in the art as CLI (Changeable Laser Image) or MLI (Multiple Laser Image) features. Other security features use so-called parallax barriers, in which individual areas of information are obscured by the visual barrier, the

spaced from the stored information and located in front of the stored information with respect to the viewing direction.

Basically, there is a need to provide new and / or improved security features as well as new and / or improved security feature verification methods and methods

Provide security documents containing these security features. Features which 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, for different

Viewing geometries recorded at least two graphic images and evaluated the graphical illustrations and derived therefrom a 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 in the 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-like LCD, TFT screens or the like are display device in the sense of what is described here. Further, visualization devices of mobile phones, personal digital assistants (PDAs) or the like are display devices as defined herein

Described.

As a visual barrier, each structural unit of a security document is understood, which selectively releases different information components for different viewing geometries, which are arranged, formed or displayed on a side of the visual barrier facing away from the viewer or a detection unit. For example, a visual barrier can consist of a microlens array, wherein the microlenses do not necessarily have to be designed with an identical focal length and / or orientation of their optical axis. A visual barrier can also be in the form of a pattern of transparent or translucent areas on the one hand and opaque

On the other hand be formed areas. For example, other visual barriers may be at different angles to a surface normal of a plane Layer formed channels may be formed in the form of through-hole, wherein the layer itself is opaque.

A partial image part is a part of an information which is combined with a further partial image part into an overall image, i. H. to complete information. Partial image portions can be, for example, graphic representations of information that can be perceived when viewed through an eye of a human being. There one

Perception of a near object by another eye of the same observer takes place from a different position, the sub-image portions differ from both eyes of the human observer at the same time of the same information

be perceived. Thus, two such sub-image components can become one

Complete the overall picture, which in a human observer one

produces three-dimensional image impression, as long as the considered object is three-dimensional. However, partial image portions can also have completely different information contents, which complement each other to form a total information which can then be graphically recorded. For example, a first subpicture may have seemingly indiscriminately arranged black image areas in front of a monochrome, for example, white background, and a second subpicture also have seemingly randomly arranged black image areas in front of the same background, but complement each other in such a way that in the complement they appear to be random arranged black area represent a total information, which represents, for example, alphanumeric characters or symbols that are easily detectable and represent information coding that can be evaluated in a simple manner for a human observer or for a machine evaluation.

An imaging geometry or viewing geometry may, for example, be characterized by a direction under which a security document is viewed or detected. For example, a viewing direction may be defined as the optical axis of camera imaging optics relative to a surface normal of the viewed object. This means that a viewing or graphic detection of an object from different directions represents a detection under different viewing geometries. A detection of an object from the same viewing direction, but from different distances represents a capture of two images under different imaging geometries. It is understood that combinations of these are possible. By color mixing is meant a color addition and a color subtraction. If light of different wavelengths, ie different colors, superimposed, so often results for a human observer, a color impression of the

Differs color impressions that cause the different wavelengths in a separate consideration. This process is called color addition. An image constructed of different colored pixels that no longer resolves a human eye separately also often causes a color impression to the viewer, which differs from the color impressions that the individual pixels or print pixels have in a human viewing Invoke observers. If an image is composed of different body colors, then the mixture is called color subtraction.

Preferred embodiments

Proposed is a method for verifying a value or

A security document, comprising the steps of: operating a display device on the display surface of which a graphical representation is displayed, placing a security document in front of a display area with the displayed graphical representation (in particular placing the security document on the display area), wherein the security document is a security feature with a visual barrier comprising viewing or capturing an image in phantom for different viewing geometries, in particular different ones

Viewing directions and / or viewing distances or detection directions and / or detection distances, different behind the visual barrier information shares releases, the visual barrier is integrated into the security document so that at least for a viewing geometry a review through the visual barrier and the security document on a behind the

Security document information is possible, wherein the graphical representation at least a first field part of the at least one

Viewing geometry includes capturing at least two images of the security document mounted in front of the display device for at least two

different viewing geometries, evaluation of the recorded at least two images and deriving a verification decision. The advantage of the invention is that with widely available display devices, such as for example of personal computers, personal digital assistants or mobile telephones, in particular those designated as smartphones

Mobile phones are used, can be verified. The invention also has the advantage that novel security features are easily verifiable.

The invention comprises several independently and in combination with one another

inventive aspects that can be realized in different embodiments. The individual features of individual aspects and / or embodiments described below can be used to develop the various aspects and / or embodiments.

According to one aspect of the invention, it is provided that a homogeneously monochromatically formed first sub-image component is displayed on the screen, the first

Color impression causes, and at least a second partial image portion is displayed, which is homogeneously monochrome and one of the first color impression

different second color impression causes, and is examined in the evaluation, whether in a human observer as viewed through the visual barrier through a monochrome color impression is caused, which is different from the first and the second color impression. This allows a simple and reliable

Verification.

In one embodiment, it is checked if different monochrome

Color impression-inducing partial images can be added to an overall image, which causes a deviating homogeneous monochrome color impression in the viewer in the overall picture. In one embodiment, it is thus checked whether a color perception is caused in a human, due to a

Color mixing of the at least one partial image portion and the at least one second partial image portion is caused and differs the color perception of the overall image of the at least one partial image and the at least one second partial image.

In a preferred embodiment, the at least two images for different viewing directions are detected. By a human user this is done, for example, by a simple look with both eyes. Since these are spaced apart, consider the two eyes that in front of the display area the display device arranged security document under different viewing directions. An evaluation and verification can thus be perceived directly by a human observer in a simple manner. Likewise, however, it is of course possible to capture the different images by two cameras spaced apart from each other, for example digital cameras, and with an evaluation device, for example in the form of a program-controlled one

Microprocessor device to evaluate the captured graphic images and to make based on the evaluation of a verification decision.

Another embodiment according to one aspect of the invention provides that the at least two images from different distances from the

Security document to be captured. In one embodiment, it is provided that at least a second partial image portion is stored in the security document, which passes through the visual barrier under at least one of the at least one

Viewing geometry, for example, the at least one viewing direction different viewing geometry, for example, different

Viewing directions, is perceptible and when evaluating the at least two mappings, a supplement of the partial image parts is examined to an overall picture.

For example, it can be checked whether alphanumeric characters or simple graphic symbols that are not completely contained in the partial image portions can be detected in the overall image. In another embodiment, it is provided that at least one second partial image component is displayed on the display surface in addition to the at least one partial image component and it is checked during the evaluation of the at least two images as to whether the images in each case comprise the first or the second partial image component in such a way that that these add up to an overall picture. In this embodiment, the two pieces of information that the user perceives are both displayed on the display surface so that they pass through the visual barrier of the display

Security document are "mapped" into separate perceptible under different viewing geometries, so that a superimposition of the partial images

Overall picture results.

According to one aspect of the invention, alone or in combination with others

Aspects of the invention can be realized, the sub-images are designed so that they have a 3D effect in a human observer under excellent

Viewing geometries for the at least two images causes. Here, the first partial image portion displayed on the display surface and the second partial image portion either displayed on the display surface or be formed in the security document itself.

The partial image information or partial image information which is displayed on the display surface must therefore be adapted to the visual barrier and optionally additionally to a partial image component which is formed in the security document.

Therefore, in an embodiment according to one of the aspects of the invention, it is provided that an identifier is detected and the graphical representation on the for the

Display area depending on the identifier from a memory, such as a database retrieved or generated by calculation based on the identifier. This creates the possibility of being able to check a large number of different security documents, for which individually different graphic representations are required on the display area. Other embodiments of

Security documents can be designed such that they can each be verified on the display area with the same graphical representation.

In a development of the aspects according to the invention, it can be provided that the verification should only be possible if a person who is assigned to the security document agrees to this verification. This is for example possible because in addition to the identifier, a PIN is detected and retrieval and / or generating the graphical representation is only possible if the identifier and the associated PIN have been detected and verified as belonging together correctly.

In an embodiment according to one of the aspects of the invention, it is checked whether it is perceptible to a human observer an expected image impression, which results from the superimposition of the one partial image portion with the further partial image portion or second partial image proportion, which differs from the viewing geometry deviating from the one viewing geometry the visual barrier is perceptible.

In one embodiment of one of the aspects of the invention, it is checked whether personal information is present in one of the two images or in the resulting overall image. Personalizing information is such

Information that a person who has the security document is assigned to individually characterize. Personalizing information may be, for example, a name, a date of birth, an address or the like.

In some embodiments, such personalizing information is stored in the visual barrier of the security document, and is perceivable when viewing the security document in front of the display area, as long as the graphical user interface is secure

Representation on the display surface is adapted to the visual barrier and possibly adapted to the image components stored in the first security document. Likewise, it is possible for information on the display surface to be perceptible when viewed or mapped without a security document disposed in front of it, but obscured by the visual barrier, although a resulting overall image does not appear to encompass covered image areas. This is

for example, with a visual barrier that includes microlenses. Under certain viewing geometries, individual constituents selectively become

Information for certain viewing directions "not shown" and instead other information shares shown. In other embodiments, when viewed through the viewing barrier, information portions disposed on the display area in the graphical representation are "scattered" to depict information that is graphically captured by a human viewer, such as alphanumeric characters or simple graphical symbols.

To obtain a suitable supplement to an overall picture is a relative

Arrangement of the security document and here the visual barrier relative to the graphical representation and the respective viewing geometries of each other necessary. Therefore, it is provided in one embodiment that the representation of the at least one partial image portion and / or the at least second partial image component is anchored on the display surface or be and multiple imaging pairs are evaluated. A positive verification decision is made, for example, if for one of the image pairs an expected supplement of the partial image parts to an overall image is successfully possible. Such a successful supplement finds

for example, when a 3D impression is made on a human observer.

Alternatively or in addition to the variation of the at least one partial image or of the at least one partial image or the at least second partial image on the display in one embodiment, the arrangement of the security document before

Display area varies and evaluated at least two mappings at least in pairs, wherein each of at least two evaluated at least two images, such images are the same time or at least for the same

Orientation of the security document relative to the same representation on the

Display area and the at least two mutually different

Viewing geometries are recorded. Likewise, it is possible, alternatively or additionally, to vary the viewing geometries, for example by changing a viewing distance which in the case of a human observer with a

Viewing direction change for the perceived images in the eyes.

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 another

Verification process;

Fig. 3 is a schematic representation of a display device

security document which formed a visual barrier of spaced transparent and opaque strips

Visual barrier comprises;

3a is a schematic representation for explaining the perception of

Security document of Figure 3 under a first viewing direction.

Fig. 3b is a schematic representation for explaining the perception at

Viewing the security document of Fig. 3 under a different viewing direction;

4 shows a schematic representation of a security document which is arranged on a display surface on which different partial image portions are displayed for a stereoscopic image; 4a is a schematic explanation of the perception or

Image detection in the security document of Fig. 4;

Fig. 5 is a schematic representation of a security document in front of a

Display surface in which the visual barrier is formed by perforations in the security document;

6 is a schematic representation of a security document in front of a

A display area, wherein a partial image portion of a stereoscopic image is encoded in the security document;

Fig. 7 is a schematic representation of a security document, which as

Visual barrier has a microlens array with microlenses of different focal lengths;

8 shows a schematic representation of a security document which is arranged in front of a screen, the security document having as a visual barrier a microlens array of microlenses of the same focal length.

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 graphical representation that can be displayed on the display surface 3 comprises at least a first partial image portion 101 for a verification of the security document 1 or the see-through security feature 2 contained therein. The at least one partial image portion is formed in the form of strips 101 -1 in this embodiment. The stripes 101 -1 can all be formed homogeneously monochrome. In other embodiments, the stripes 101-1 of the frame portion 101 represent strip-like portions of a photographic image or an alphanumeric "text" against a background.

The see-through security feature 2 includes a visual barrier 210. The visual barrier

210 comprises transparent, for example transparent, in particular color-neutral sections 21 1 and opaque, opaque sections 212. The transparent sections

21 1 and the opaque portions 212 are in this embodiment

strip-like, alternately formed. In other embodiments, the geometric configuration of the opaque and transparent sections can be chosen completely differently.

The visual barrier 210 can be produced for example by a partial printing, for example with parallel color stripes 213, on a transparent film which is joined together with other films to form a document body, which are transparent at least in the area of the see-through security feature.

In other embodiments, the visual barrier 210 may be formed by micro-perforations formed, for example, in an inner opaque layer.

Preferably, the perforated opaque layer is laminated between further transparent layers in a security document body. At another one

Embodiment, the visual barrier is formed by means of a microlens array.

The visual barrier 210 is integrated into the security document 1 in such a way that, under a viewing direction through the visual barrier 210 and the security document 1, it is possible to view information or graphically record information that is displayed behind the security document. Furthermore, the visual barrier is formed such that at least one viewing direction exists, under which this information component through the visual barrier 210 and the

Security document 1 is perceptible and an alternating

Viewing direction exists through which this share of information can not be perceived or at least not fully perceived. The visual barrier thus causes view angle dependent arranged behind the security document Information through the security document and the visual barrier

be perceived or can not be perceived.

If the security document 1 is arranged in front of the display surface 3, the first partial image portion 101 shown on the display surface will be in the region of

See-through security feature 2 and the visual barrier 210 affects the detectable graphical image of the see-through security feature 2 contemplation angle dependent. During verification, at least two images are thus detected, which are formed from the "overlaying" of the first partial image portion 101 shown on the display surface 3 and the visual barrier 210 formed in the security feature 2. By means of a suitable choice of the graphical representation of the first partial image portion 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 transparent security feature 2 can be perceived in front of the display surface 3. The captured images, which are detected, for example, with a camera (not shown) in succession or with two cameras (not shown) spaced apart, are evaluated in a downstream evaluation device, for example the computer 5, in order to make a verification decision.

In simple verification systems, the first partial image portion 101, which is displayed on the display surface 3 of the display device 4, regardless of the verifiable security document 1 and its see-through security feature 2 in the sense that the same on the display surface 3 shown first partial image portion 101, for example a regular monochrome line grid, for a variety or all security documents 2 can be used to derive from the resulting images of the security document 1 in front of the display surface 3, the verification decision can. For example, it can be checked whether the first partial image portion 101 is perceptible in the image acquired under a viewing geometry, in this case a first viewing direction, and is imperceptible in a captured image under a viewing geometry deviating from the one viewing geometry, here a different viewing direction is.

For a verification decision, however, it is not the perceptibility and non-perceptibility of the same information that will be decisive in the eye; Check whether the information contents of the two figures, which are perceptible under different viewing geometries, make sense.

Preferably, on the display surface 3 of the display device 4, in addition to the first partial image portion 101, a second partial image portion 102 is shown graphically. The second partial image portion 102 is also strip-shaped, with the strips 101-1 of the first partial image portion being arranged alternately with strips 102-1 of the second partial image portion 102 on the display surface. The arrangement is adapted to the visual barrier 210 of the security document 1, which with this graphical representation on the

Display area 3 is to be verified. With a suitable relative arrangement of

Security document 1 in front of the display surface 3 and a capture of the images under suitable viewing directions, the partial image portions 101 and 102, which are perceptible in the two captured images, partial images that lead to a three-dimensional image impression in a human, provided the images each separately one of Eyes of a human being "fed". Thus, a human being at an appropriate distance from the security document 1 considers this

Transparent security feature 2, while the security document 1 before the

Display surface 3 is arranged, it can perceive a three-dimensional image, provided that the partial image information portions 101, 102 are adapted to the visual barrier 210 suitable. It is understood that, in particular in visual barriers, in which the opaque portions 212 and the transparent portions 21 1 represent other geometric configurations, in particular irregular or not regularly appearing patterns, a 3D image perception is only possible if the corresponding partial image portions suitable the visual barrier are adjusted. Thus, a high verification accuracy can be achieved.

A higher verification reliability is obtained with a system which is shown schematically in Fig. 2. In this system, the first partial image portion 101 or are the partial image portions 101, 102 shown on the display surface 3 of the display device 4 depending on an identifier 10, which is assigned to the security document 1. In the example shown, a serial number 1 1 is used as identifier 10. The

Identifier 10 is detected by a 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 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, a first partial image portion 101 and a second partial image portion 102 are displayed here. Before the

Display area 3 is as in the embodiment of FIG. 1 the

Security document 1, which is a see-through security feature 2 with a

Visible barrier 210 includes arranged. Subsequently, the at least two images for different viewing geometries are detected, which capture at least part of the see-through security feature 2 in transmitted light. The captured image are 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 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. The evaluation can also be done in the computer 5.

The mode of action of a visual barrier is explained schematically with reference to FIGS. 3, 3a and 3b. FIG. 3 shows a schematic representation of a security document 1, which comprises, for example, on a front side 220 a visual barrier 210 formed from opaque, spaced-apart color stripes 213. In other embodiments, a visual barrier formed in this way can also be found in the interior of the

Security document 1 may be formed. Otherwise, the security document 1 is transparent and color-neutral in the illustrated embodiment. This means that light of all wavelengths in the visible wavelength range can pass through the security document with almost no attenuation or at least without any attenuation, or at least, however, this wavelength-independent attenuation. Only the color stripes 213 are designed such that they preferably completely absorb light in the visible wavelength range. The security document 1 is arranged for verification in front of a display surface 3 of a display device 4. On the display surface 3, a first partial image portion 101 and a second partial image portion 102 are shown, which are formed of alternately nested strips 101 -1, 102-1. The stripes 101 -1 of the first partial image portion 101 are formed homogeneously red and the stripes 102-1 of the second partial image portion 102 are homogeneously green. As shown in Fig. 3a is, when viewed perpendicular to the front side 220 of the security document 1 only green light passes through the transparent or transparent portions 21 first The red light is absorbed by the color stripes 213 and can not be detected by a first image in the vertical viewing direction. FIG. 3 b shows which light components can be perceived by the display surface 3 when viewed at 45 ° with respect to the surface of the front side through the visual barrier 210 and the security document 1. Only red light passes through the transparent portion 21 1, whereas green light is absorbed by the color stripes 213. Different viewing directions thus become different

Information shares of the graphical representation on the display surface 3 perceived, so that different images arise, which can be used in a common evaluation for deriving a verification decision. If the partial image portions 101, 102 and the visual barrier 210 are formed such that a viewer no longer resolves the strips of the individual partial image portions at a predetermined distance, in which he or she views the security document at 90 ° and 45 ° with his eyes, he / she assumes the color addition true a yellow area. The 90 ° angles are chosen for illustrative purposes only and differ from the angles chosen for practical implementation.

The embodiment of the security document 1 shown in FIGS. 4 and 4a and the graphical representation on the display surface 3 are similar to that of FIG. 3. In this embodiment, the stripes 101 -1 of the first partial image portion 101 and the stripes 102-1 of the second partial image portion 102 each strip of sub-images, which causes a three-dimensional representation of the information contained in the sub-image portions 101, 102 in a human viewer with a suitable overlay. The visual barrier 210 formed in the security document 1 ensures that either only the stripes 101-1 of the first partial image portion 101 or the stripes 102-1 of the second partial image portion 102 can be perceived under different viewing directions. At a suitable distance in front of the security document, the correct orientation of the security document relative to the graphical representation on the display surface 3 by suitably arranged detection devices, such as cameras, or by human eyes, respectively the sub-images are separately detected. A human observer perceives a three-dimensional image in such a case. In Fig. 4a, this situation is shown schematically. The left eye 231 perceives only the first partial image portion and the right eye 232 only the second partial image component 102 true.

FIG. 5 shows an alternative embodiment in which the visual barrier 210 is formed by perforations 241, for example microperforations in an otherwise opaque security document. Again are under suitable

Viewing directions in each case only the separated field parts

perceptible or detectable. In order to obtain a correct orientation of the security document relative to the graphical representation on the display surface, for example, the security document can be moved relative to the display surface and temporally successive images are detected, which are then evaluated in pairs. In the evaluation, it is checked whether a 3D impression is caused in an arrangement. Alternatively or additionally, the graphical representation can be varied on the display surface, thereby adapting to the respective

Security document or the visual barrier contained therein and / or the orientation of the security document relative to the display surface 3 to achieve. These

Of course, the variations described are also useful and applicable to the different visual barriers.

FIG. 6 shows an embodiment in which a partial image portion 102 which can be supplemented into a three-dimensional overall image is formed and stored in the security document 1 at a distance from the visual barrier 210. On the

Display area 3 is now the necessary to complement other field portion 101 is shown, so that with appropriate positioning of the security document 1 in front of the display area 3 under a viewing direction stored in the security document 1 field share 102 and under another viewing direction of the display area 3 shown in the display part 101 are perceptible , The

For example, the verification decision can be made dependent on whether the partial image component 101 displayed on the display surface is supplemented with partial image component 102 stored in the security document in such a way that a three-dimensional perception is produced by the user. However, it is also possible that it is checked whether a suitable mixed color is perceived, for example, by homogeneously monochrome formed partial image portions in a human

Observer is caused, provided that the field parts of their geometric

Dimensions are nested so that the viewer is the individual geometric configurations of the transparent and opaque sections does not dissolve, but the perceived from the two perceived by the different parts of the field parts image as a total information perceives.

In Fig. 7, a further embodiment is shown schematically in which the

Visual barrier is formed by microlenses. In the illustrated embodiment, the viewing barrier comprises a microlens array 300 including first microlenses 301 having a first focal length 305 and second microlenses 302 having a second focal length 306 different from the first focal length. In the illustrated embodiment, the first and second microlenses 301, 302 are, for example

Cylindrical lenses are arranged alternately. These form under a first

Viewing direction different partial image portions 101, 102, which are shown on the display surface 3 of a display device 4, in different image planes 303, 304 from. Thus, images recorded at different distances have different information contents and can be used to derive the

Verification decision be used. In addition, microlenses form different areas of the display area under different viewing directions, so that a viewing angle dependence is also present. If appropriate

Embodiment parts of the image, which are shown on the display surface, also perceived in this embodiment so that a three-dimensional image impression is created in a viewer.

In one embodiment, it is provided that it is checked whether a color perception is caused in a person, which is caused by a color mixing of the at least one partial image portion (101) and the at least one second partial image portion (102) and the color perception of the overall image of the distinguishes at least one partial image portion (101) and the at least one second partial image component.

In Fig. 8, an embodiment is shown in which again a field part of the

Information is stored in the security document. The security document 1 comprises a microlens array 300 in which the microlenses 301 all have the same focal length 305. In this embodiment, the different partial image portions, the partial image portion 101 displayed on the display surface, and the partial image portion 102 stored in the security document 1 become different levels sharply imaged, since the information portions, ie the sub-picture portions 101, 102 are arranged at different distances to the microlenses.

In other embodiments, the microlenses may be configured to have one on the display surface when viewed without an array of the

Security document in front of the display surface perceptible information when placing the security document in front of the display area so that it is no longer perceptible, but instead a uniform monochrome surface is perceived. Thus, under a viewing direction, the pieces of information carrying, for example, alphanumeric information are mapped in directions that do not coincide with the one viewing direction. Instead, information portions of the background for "populating" the areas where the alphanumeric information is displayed on the display area are imaged for perception from the one viewing direction. In another embodiment, the microlenses are formed so that a seemingly random pattern through the

Microlenses is mapped so that, for example, an alphanumeric information is perceptible.

It is understood by those skilled in the art that only exemplary embodiments of visual barriers are descriptive here.

LIST OF REFERENCE NUMBERS

1 security document

2 see-through security feature

3 display area

4 display device

5 computers

6 users

10 identifier

1 1 serial number

12 detection device

13 database

14 camera

15, 16 specifications

17 PIN

101 first field part

101 - 1 strip

102 second field part

102- 1 strip

210 visual barrier

21 1 transparent sections 212 opaque sections 213 color strips

220 front side

231 left eye

232 right eye

241 perforations

300 microlenses

301 first microlenses

302 second microlenses

303, 304 image planes

305 (first) focal length

306 second focal length

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) a graphical representation is displayed,

Arranging a security document (1) in front of the display surface (3) with the illustrated graphical representation, wherein the security document (1) comprises a security feature with a visual barrier (210) which, when viewed in review for different viewing geometries, is different behind the visual barrier (210). The visual barrier (210) is integrated into the security document (1) so that, at least for one viewing geometry, a view through the visual barrier (210) and the security document (1) to an information component located behind the security document (1) is possible,

wherein the graphical representation comprises at least a first partial image portion (101) for the at least one viewing geometry,

Detecting at least two images of the security document (1) in front of the display device (4) for at least two different ones

Viewing geometries,

Evaluating the recorded at least two images and deriving a verification decision,

on the screen, a homogeneously monochromatically formed first partial image portion (101) is produced, which produces a first color impression, and at least a second partial image portion (102) is formed, which is homogeneously monochrome and causes a different color impression from the first color impression, and the Evaluation is checked whether in a human observer when viewing through the visual barrier (210) through a monochrome color impression is caused, which is different from the first and the second color impression.

2. The method according to claim 1, characterized in that the detection of the

Illustrations are performed under different viewing geometries by capturing the images under different viewing directions.

3. The method of claim 1 or 2, characterized in that at least a second partial image portion (102) is stored in the security document (1) through the visual barrier (210) through at least one of the at least one viewing geometry different

Observation geometry is perceptible, and when evaluating the at least two mappings, a supplement of the partial image parts is examined to form an overall image.

4. Method according to one of the preceding claims, characterized in that on the display surface (3) in addition to the at least one first partial image portion (101) at least a second partial image portion (102) is displayed, and is checked in the evaluation of at least two images, whether the images comprise the first and the second field part (101, 102) in such a way that they complement one another to form an overall picture.

5. The method according to any one of the preceding claims, characterized in that on the screen as a first partial image portion (101) a monochrome surface is shown and as a second partial image portion (102) is a monochrome surface is displayed.

6. The method according to any one of the preceding claims, characterized in that the viewing directions for receiving the at least two images are varied.

7. The method according to any one of the preceding claims, characterized in that the representation of the at least one partial image portion (101) and / or the at least second partial image portion (102) is varied on the display and a plurality of imaging pairs are evaluated.

8. The method according to any one of the preceding claims, characterized in that the arrangement of the security document (1) in front of the display surface (3) is varied and the detected at least two images are evaluated at least in pairs, wherein each evaluated at least in pairs of the at least two images such are detected at the same time or at least for the same orientation of the security document (1) relative to the representation on the display surface (3) under the at least two mutually different viewing directions.