CN107517588B

CN107517588B - Document

Info

Publication number: CN107517588B
Application number: CN201680010243.0A
Authority: CN
Inventors: 安德里亚斯·瑞秋; 克里斯托夫·马焦尼
Original assignee: Bundesdruckerei GmbH
Current assignee: Bundesdruckerei GmbH
Priority date: 2015-02-12
Filing date: 2016-02-12
Publication date: 2020-05-22
Anticipated expiration: 2036-02-12
Also published as: WO2016128540A1; EP3256331B1; CN107517588A; EP3256331A1; PL3256331T3; DE102015102037A1

Abstract

The invention relates to a document (100) comprising: a first document page (101) having a light-transmissive window (103); -a second document page (105) having a security feature (107) arranged in a predetermined area, wherein the position of the predetermined area on the second document page (105) corresponds to the position of the transparent window (103) of the first document page (101) such that the security feature (107) is readable through the transparent window (103) when the first document page (101) and the second document page (105) are brought together.

Description

Document

Technical Field

The present invention relates to the field of document authentication.

Background

Documents, such as identity documents or valuable documents, are often multi-page or single-page designs. In this process, security features are often applied to multiple document pages of a document to increase the security protection of the document. Verifying the security features applied to the respective document pages often requires careful inspection of each respective document page.

Disclosure of Invention

It is therefore an object of the present invention to develop an efficient concept for validating documents.

The object is achieved by the features of the independent claims. Advantageous further developments form the subject matter of the dependent claims, the description and the drawings.

According to a first aspect, the invention relates to a file comprising: the first document page is provided with a transparent window which transmits light; a second document page having a security feature disposed in a predetermined area, wherein the position of the predetermined area on the second document page corresponds to the position of the transparent window of the first document page such that when the first and second document pages are brought together, the security feature is readable through the transparent window. The advantage is thereby achieved that the security features associated with the second document page can be checked at the same time as the first document page is checked.

The document may be an identification document, in particular a multi-page identification document or a document of value. Further, the document may be a security document or a bank note.

At least a portion or section of the transparent window can be light transmissive.

The identification file may be one of the following identification files: such as identification documents like identification cards, passports, entry cards, licence licenses, work cards, tax stamps or tickets, birth certificates, driver licenses or vehicle registrations, and payment documents like bank notes or credit cards. The identification file may also include an electronically readable circuit, such as an RFID chip. The identification document may be single-or multi-layered and paper and/or plastic. The identification document may be constituted by plastic base films which are glued or laminated together into a card body, preferably with similar material properties.

The first document page and the second document page may be adjacent document pages or a document sheet of the document. In addition, the individual document pages may be bound together. For example, the individual document pages are held together by wire binding, wire stitching or adhesive bonding. Further, the respective document pages may be formed by folding or pleating the document sheet. The individual document pages may also be made of a light-transmitting material.

The transparent window may be formed by an opening in the first document page. The opening is covered by a transparent film. The security feature may be an optical security feature such as a hologram, motion map, identifier, or other feature such as an embossed pattern or applied pattern.

According to one embodiment, a further security feature is formed in the transparent window and the security feature and the further security feature are complementary to form one complete security feature. Thereby realizing the advantage of further improving the anti-counterfeiting protection of the file.

Another security feature may be provided on a transparent film covering or forming the transparent window.

According to one embodiment, light in the visible wavelength range, the infrared wavelength range and/or the ultraviolet wavelength range may be used for reading the security feature and/or the further security feature. Thereby the advantage is achieved that the security feature and/or the further security feature can be optically detected. For example, the security feature or another security feature may be read wholly or completely in the visible wavelength range, while only part of the security feature or another security feature may be read in the infrared wavelength range. Thus, it is also possible to form a matrix, for example in the infrared region or in the UV region, which encodes data of a document, for example personal data or document data.

In some cases, the security feature and/or the further security feature may comprise a single graphical element, e.g. a letter, a number or a graphical pattern, which may be read in the same or different wavelength ranges, respectively, e.g. in the infrared range and/or in the ultraviolet range. For this purpose, the individual elements can be printed with the same or different printing inks which have different optical properties in different wavelength ranges and which, for example, reflect or absorb light.

According to one embodiment, the security features may include: a plurality of first individual graphical elements capable of being read when illuminated by light in the white light or visible light wavelength range; and a plurality of second individual graphical elements capable of being read when illuminated by white light and/or infrared light.

According to one embodiment, the security features may include: a plurality of first individual graphical elements capable of being read when illuminated by white light or infrared light; and a plurality of second individual graphical elements capable of being read when illuminated by ultraviolet light.

According to one embodiment, the security feature may comprise a plurality of first individual graphical elements which are capable of being read when illuminated by white light or infrared light; and the further security feature may comprise a plurality of second individual graphical elements which are capable of being read when illuminated by white light and/or infrared light.

According to one embodiment, the security feature may comprise a plurality of first individual graphical elements which are capable of being read when illuminated by white light or infrared light; and another security feature may comprise a plurality of second individual graphical elements which are capable of being read when illuminated by ultraviolet light.

According to one embodiment, the complete security feature formed by the security feature and the further security feature may form a checksum, in particular an alphanumeric checksum. For example, the checksum is a checksum of file data or personal data.

According to one embodiment, the complete security feature formed by the security feature and the further security feature may form a code, in particular a barcode, a 2D code or a 3D code. For example, the code encodes file data or personal data or a checksum, hash value or digital signature thereof.

According to one embodiment, a security feature may be formed on an inner page of a document of a passport booklet.

According to one embodiment, the transparent window can be formed in the data page of the document.

According to one embodiment, the security feature and the further security feature may be provided on facing pages of the document. This enables a further security feature and combination of security features to be implemented on the folio in the transparent window.

According to one embodiment, the security feature may be machine-readable or read by such a machine, in particular when illuminated by light in the white light or visible wavelength range, and the further security feature may also be machine-readable or read by such a machine. This prevents false rejects when checking files that are not open pages.

According to one embodiment, the security feature comprises a code. Thereby the advantage is achieved that the encoded information can be read from the security feature. The code may encode information for authenticating the file. For example, the code encodes file data such as the name of the file creator, or personal data such as the name of the file holder. The document may be authenticated by comparing the information with information printed on the document.

According to one embodiment, the file is a personal identification file and includes a code of encoded personal data. Thereby realizing the advantage of detecting the operation thereof by comparing the personal data printed on the document with the decoded code.

According to one embodiment, the code comprises information encoded using one of the following methods, in particular personal data encoded using one of the following methods: a digital signature of the encoded information, an asymmetric encoding of the information using the encryption key or a symmetric encoding of the information using the encryption key, or the code comprises a checksum or hash value, in particular of the personal data, the file data or a part of the personal data or the file data. Thereby achieving an advantage that files can be efficiently checked for operation.

The personal data may be the name, date of birth, place of birth, or personal number of the holder of the document. Further, the file data may be an expiration date, a serial number, or a name of a file generator. Further, personal data or document data may be printed on the document. The printed personal data or document data may be checked using information decodable from the code to detect operation of the printed personal data or document data. For example, the information includes a hash value of the file holder's name formed by the message digest algorithm 5(MD5) standard or the standard Secure Hash Algorithm (SHA) standard.

According to one embodiment, the code is an optically detectable code, in particular a barcode or a multi-dimensional code. Thereby achieving the advantage of being able to detect the code using an economical optical code reader. For example, the Code is a bar Code, Quick Response (QR) Code, point Code, Aztec matrix Code, data Code or other machine readable Code according to one of the Code93, Codabar or Code128 standards.

According to one embodiment, the document is an identification document of an individual and has document pages comprising personal data, wherein the security feature contains or provides the personal data, in particular in encoded form. Thereby realizing an advantage that personal data on a document page can be effectively verified. The document page may be a first document page.

According to one embodiment, the advantage is achieved that the transparent window can be integrated particularly economically into the first document page by forming the light-transmitting window through an opening in the first document page. For example, the transparent window is punched out of the first document page.

According to one embodiment, the opening is covered by a light-transmissive film. Thus, the advantage of improving the anti-counterfeiting protection of the file by integrating the security elements which are difficult to forge is realized. The transparent film may be a transparent plastic film, such as polyvinyl chloride (PVC).

According to one embodiment, a further security feature is formed in the transparent window. The further security feature may for example be formed in or on a transparent film forming or covering the transparent window. The further security feature may comprise or be used to complement the features of the security features described above.

Furthermore, the further security feature may also be light-transmissive in a specific wavelength range, for example in the ultraviolet wavelength range or in the white wavelength range, in whole or in part, so that the security feature can be read by the further security feature. Conversely, the further security feature may be light-absorbing or light-reflecting in a further wavelength range, for example in the infrared wavelength range, so that the further security feature can be read in this wavelength range.

According to a second aspect, the invention relates to a document, in particular a single-sheet document, such as a valuable document or a bank note or an identification card, having a document page comprising a window which is light-transmissive in a first wavelength range, wherein a security feature is formed in a transparent window which is readable in a second wavelength range.

The security feature may for example be formed in or on a transparent film forming or covering the transparent window. The security feature may have the features of the security feature described above and/or another security feature.

The security feature is light-transmissive, light-reflective or light-absorbing in a first wavelength range, for example in the ultraviolet wavelength range or in the white wavelength range. In contrast, the security feature may be light-absorbing, light-reflecting or light-transmitting in the second wavelength range, for example in the infrared wavelength range, so that the security feature may be read in the first or second wavelength range.

According to a third aspect, the present invention relates to a document reader for reading a security feature of a document, wherein the document comprises a first document page having a light-transmissive window and a second document page having a security feature, whereby the security feature is arranged in a predetermined area, wherein the position of the predetermined area on the second document page corresponds to the position of the transparent window of the first document page, such that the security feature can be read through the transparent window when the first and second document pages are brought together, and the document reader comprises: an imaging device for optically inspecting the transparent window to obtain an image containing the security feature; and a processor for detecting a security feature based on the image. Thereby the advantage is achieved that the security feature can be read efficiently.

The file reader may be an ID file reader, or an element of a self-service terminal, vending machine, timing system or access control system.

The file may be a file according to the invention. Furthermore, the imaging device can be designed to record images of documents, for example in the infrared wavelength range, the visible wavelength range and/or the ultraviolet wavelength range. The imaging device may also include an image sensor, a light element for illuminating the document, and/or a lens. For example, the imaging device is constituted by a camera or a scan line such as a scan line of a flatbed scanner. Furthermore, the processor may be designed to detect the position of the transparent window in the image and/or the position of the security feature in the image by pattern recognition.

According to one embodiment, the processor is designed to determine the position of the transparent window in the image and detect the security feature at a specific position of the transparent window. Thereby achieving the advantage of being able to effectively detect security features.

According to one embodiment, the processor is designed to detect the position of the transparent window in the image by identifying an edge or contour of the transparent window. Thereby achieving the advantage that the position of the transparent window can be determined efficiently.

According to one embodiment, the document reader further comprises a light source, in particular a white light source, an infrared light source or an ultraviolet light source, which is designed to illuminate the security feature through the transparent window. Thereby the advantage is achieved that an external light source to illuminate the security feature or document can be omitted.

According to one embodiment, the document reader further comprises a document table on which documents may be placed. Thereby the advantage is achieved that optical detection of the transparent window by the imaging means can be facilitated by establishing the position of the document.

According to one embodiment, the imaging device is constituted by a camera or a scan line. Thereby the advantage that can detect the transparent window effectively has been realized.

According to one embodiment, the processor is further designed to detect code incorporated into the security feature. Thereby realizing an advantage that the security feature can be evaluated effectively.

According to one embodiment, the processor is further designed to decode the code in order to obtain a decoded information item. Thereby the advantage is achieved that the information encoded in the code can be read.

According to an embodiment, the processor is further designed to verify the information items included in the file by means of the decoded information. Thereby achieving the advantage of being able to check the file for operation.

According to one embodiment, another security feature is formed in the transparent window. The further security feature may be light-transmissive in a specific wavelength range, for example in the ultraviolet wavelength range or in the white wavelength range, so that the security feature can be read by the further security feature. The further security feature may conversely be light-absorbing or light-reflecting in a further wavelength range, for example in the infrared wavelength range, so that the further security feature can be read in this wavelength range. For detecting the further security feature, the imaging device may take an image of the transparent window in a wavelength range in which the further security feature is reflective or absorbing light. For reading the security feature, the imaging device may take an image in a wavelength range in which the security feature is transparent, for example in the white light wavelength range or in the ultraviolet wavelength range.

According to one embodiment, the security feature and the further security feature may be complementary in the transparent window. Thus, when two pages of a document are properly superimposed, a complete security feature or pattern can be created. This makes document authentication particularly simple.

According to one embodiment, the security feature and the further security feature may complement each other as a matrix code or form a matrix code in the transparent window. Different black inks can be used. For example, the security feature comprises an IR absorbing black ink and the further security feature comprises an IR transparent black ink, or vice versa, wherein the respective black ink appears black to a viewer identically in the visible wavelength range, or wherein the security feature and the further security feature are complementary, in particular as one feature, in the non-visible UV range.

The document reader may also detect a security feature according to the second aspect.

According to a fourth aspect, the invention relates to a method for reading a security feature of a document, wherein the document comprises a first document page having a window that is transparent to light and a second document page having a security feature, whereby the security feature is arranged in a predetermined area, wherein the position of the predetermined area on the second document page corresponds to the position of the transparent window of the first document page, such that the security feature is readable through the transparent window when the first and second document pages are brought together, and the method comprises: optically inspecting the transparent window by an imaging device to obtain an image containing the security feature; and detecting, by the processor, the security feature based on the image. Thereby the advantage is achieved that the security feature can be read efficiently.

The method for reading a security feature of a document may be implemented by a document reader according to the invention. Other features of the method for reading the security features of a document are readily understood by the functionality of the document reader of the present invention.

The present invention may be implemented in hardware and/or software.

Drawings

Exemplary embodiments will be described in further detail with reference to the accompanying drawings. As follows:

FIG. 1 is a schematic diagram of a file according to one embodiment;

FIG. 2 is a schematic illustration of a file according to another embodiment;

FIG. 3 is a schematic view of a document reader;

FIG. 4 is a setting up of a document and document reader;

FIG. 5 is a schematic illustration of a method for reading a security feature of a document;

FIG. 6 is a file; and

fig. 7 is a file according to another embodiment.

Reference numerals

100 file

101 first document page

103 transparent window

105 second document page

107 security feature

201 topic field

203 image

205 personal data

207 machine readable area

300 document reader

301 image forming apparatus

303 processor

401 casing

403 file spine

500 method

501 detection

503 detection

600 document

601 File Page

603 window

605 Security feature

701 other Security features

Detailed Description

FIG. 1 shows a schematic diagram of a file 100 according to one embodiment. Document 100 includes a first document page 101 having a transparent window 103 and a second document page 105 having a security feature 107.

The file 100 is designed with: a first document page 101 comprising a transparent window 103; a second document page 105 comprising a security feature 107 disposed in a predetermined area, wherein the position of the predetermined area on the second document page 105 corresponds to the position of the transparent window 103 of the first document page 101, such that when the first document page 101 and the second document page 105 are brought together, the security feature 107 is readable through the transparent window 103.

The file 100 may be an identification file or a valuable file. Further, the document 100 may be a security document or a bank note.

The identification document may be one of the following identification documents: such as identification documents like identification cards, passports, entry cards, authorized licenses, company identification cards, tax stamps or tickets, birth certificates, drivers licenses or vehicle registrations, payment documents like bank notes or credit cards. The identification file may also include an electronically readable circuit, such as an RFID chip. The identification document may be single-or multi-layered and paper and/or plastic. The identification document may be constituted by plastic based films which are glued and/or laminated together into the card body, preferably with similar material properties.

First document page 101 and second document page 105 may be adjacent document pages or sheets of document 100. Furthermore, the individual document pages 101,105 can be bound together. For example, the individual document pages 101,105 are held together by wire bonding, wire stitching or adhesive bonding. In addition, each document page 101,105 may be formed by folding or pleating a document sheet. Each document page 101,105 may also be made of a light-transmitting material.

The transparent window 103 may be formed by an opening in the first document sheet 101. The opening may be covered by a transparent film. The security feature 107 may be an optical security feature such as a hologram, a motion map or an identifier.

Fig. 2 shows a schematic diagram of a file 100 according to another embodiment. Document 100 includes a first document page 101 having a transparent window 103 and a second document page 105 having a security feature 107.

Also provided on the first document page 101 are a title field 201 representing the document type of the document 100, an image 203 of the holder of the document 100, personal data 205 (which includes, in particular, the name of the holder of the document 100), and a machine-readable region 207, such as an MRZ.

First document page 101 may form or include a data sheet or data page of document 100. Further, the transparent window 103 may form or include a transparent portion, such as a window.

Fig. 3 shows a schematic diagram of a document reader 300. Document reader 300 includes an imaging device 301 and a processor 303.

Document reader 300 for reading a security feature 107 of a document 100, wherein the document 100 comprises a first document page 101 having a transparent window 103 and a second document page 105 having a security feature 107, wherein the security feature 107 is arranged in a predetermined area, the position of the predetermined area on the second document page 105 corresponding to the position of the transparent window 103 of the first document page 101, such that the security feature 107 is readable through the transparent window 103 when the first document page 101 and the second document page 105 are brought together, the document reader 300 for reading the security feature 107 of the document 100 comprising: an imaging device 301 for optically inspecting the transparent window 103 to obtain an image containing the security feature 107; and a processor 303 for detecting the security feature 107 based on the image.

The file reader 300 may be an ID file reader, or an element of a self-service terminal, vending machine, timing system, or access control system.

Furthermore, the imaging device 301 may be designed to record images of the document 100, for example in the infrared wavelength range, the visible wavelength range and/or the ultraviolet wavelength range. The imaging device 301 may also include an image sensor, a light element for illuminating the document 100, and/or a lens. The imaging device 301 is formed by a camera or a scan line, for example. Furthermore, the processor 303 may be designed to detect the position of the transparent window 103 in the image and/or the position of the security feature 107 in the image by pattern recognition.

Fig. 4 shows an arrangement of a document 100 and a document reader 300. Document 100 includes a first document page 101 having a transparent window 103 and a second document page 105 having a security feature 107. First document page 101 and second document page 105 are also joined together by document spine 403. According to one embodiment, each document sheet 101,105 may be formed by folding or pleating the document sheet. The fold may also form a document spine 403. Document reader 300 also includes an imaging device 301, a processor 303, not shown, and a housing 401. Document reader 300 is positioned on document 100 such that security feature 107 is readable through transparent window 103.

According to one embodiment, the imaging device 301 may include a scan line and/or a camera.

According to one embodiment, second document page 105 may be a page facing or adjacent to first document page 101.

According to one embodiment, the second document page 105 may be an inner page of a back cover or front cover of the document 100. For example, the second document page 105 is an inner page of a front cover of a passport in a german passport.

Fig. 5 shows a schematic diagram of a method 500 for reading a security feature 107 of a document 100. Method 500 includes

steps

501 and 503.

Method 500 for reading a security feature 107 of a document 100, wherein the document 100 comprises a first document page 101 with a transparent window 103 and a second document page 105 with a security feature 107, wherein the security feature 107 is arranged in a predetermined area, the position of the predetermined area on the second document page 105 corresponding to the position of the transparent window 103 of the first document page 101, such that the security feature 107 can be read through the transparent window 103 when the first document page 101 and the second document page 105 are brought together, the method 500 for reading the security feature 107 of the document 100 comprising: step 501: optically inspecting the transparent window 103 by the imaging device 301 to obtain an image containing the security feature 107; and step 503: the security feature 107 is detected by the processor 303 based on the image.

According to one embodiment, the transparent window 103 may be formed by a transparent window. Furthermore, the security feature 107 may form a security feature for the transparent window 103.

According to one embodiment, the background of the transparent window 103 can be unknown when the first document page 101 and the second document page 105 are not joined together or when the second document page 105 is absent. For example, in this case, the background is the hand of a person examining the document 100 or the cover of the document 100 (e.g., a passport cover). The cover or passport cover may thus form a document page provided with the security feature 107. Furthermore, passport covers, and in particular the inner sheets thereof, often have security features, such as those produced by intaglio or UV printing.

According to one embodiment, since the transparent window 103 can provide a transparent see-through surface in a non-transparent or low-transparency material, a transparent window, such as a window element, can be used as a security feature in a document of value, such as a bank note or an identification document. Further, the transparent window 103 is difficult to copy or forge, and easy to verify intuitively and manually.

According to one embodiment, a transparent window 103 (e.g., a see-through window) may enable automatic inspection of the document 100, as the transparent window 103, e.g., a transparent window element, may enable clear viewing of the security feature 107 at the same location on the adjacent page. When a document 100, such as a passport, is placed on a document reader 300, such as an ID document reader, for automated inspection and scanning, the security features 107 of adjacent pages may be inspected at the location of a transparent window, such as a window element. The security feature 107 may be a feature in the visible spectrum or in other wavelengths that are not visible to the human eye, such as in the IR or UV spectrum. Further, the security feature 107 may be a personalization feature that provides a correlation or attachment between the personalized data page of the document 100 and the passport booklet. The security feature 107 may also be a code, for example with a digital signature or Hash (Hash Value) of the producer and/or personal data or file data. For example, security feature 107 represents one or more numbers or a form of barcode or other matrix pattern.

According to one embodiment, the method 500 enables automatic inspection of a window element of a transparent window 103 or document 100.

According to one embodiment, the inventive arrangement of the transparent window 103 and the security feature 107 on the document 100 may increase the security, in particular the protection against counterfeiting, of the document 100 (e.g. a valuable or identification document).

According to one embodiment, the inventive arrangement of the transparent window 103 and the security feature 107 on the document 100 may provide a higher level of protection against alteration of the personalized data. For example, a tampered passport booklet with a tampered data page can be identified when the passport booklet and the data page are directly associated with each other or are associated by encoding.

According to one embodiment, greater protection and the ability to automatically verify the authenticity of personal data and/or document data (e.g., name, age, expiration date, or document number) may be implemented by document 100 by incorporating the data into security feature 107, for example, using a code. Furthermore, the higher protection together with the ability to automatically verify the authenticity of personal data and/or document data (e.g. name, age, expiration date or document number) can be achieved by incorporating the data into the security feature 107, for example with a code, and with an encryption coding, in particular using an asymmetric signature.

According to one embodiment, the document 100 may be a security document, such as a bank note or an identification document.

According to one embodiment, the transparent window 103 can be formed as a transparent see-through surface in an otherwise opaque or less transparent material.

According to one embodiment, the transparent window 103 can be easily inspected manually.

According to one embodiment, the automatic inspection of the transparent window 103 can be designed to be difficult to perform because nothing can be detected in the area of the transparent window 103.

According to one embodiment, the security feature 107 may constitute an automatically verifiable feature that is visible through the transparent window 103. To this end, the security feature 107 and the transparent window 103 may be provided on adjacent document pages of the document 100.

According to one embodiment, the security feature 107 may be inspected or read in the visible light spectrum, infrared spectrum, and/or ultraviolet light spectrum.

According to one embodiment, the security feature 107 may be partially or fully inspected or read in the infrared spectrum or the ultraviolet spectrum.

According to one embodiment, the security feature 107 may be personalized and/or a correlation between the data pages making up the document 100 and the passport booklet. For example, security feature 107 includes or encodes a checksum for machine-readable region 207 of file 100.

According to one embodiment, security feature 107 may encode a generator of file 100 and/or personal data or a digital signature or hash of the file data.

According to one embodiment, the method 500 may establish an automatic verification of the correlation between the passport booklet and the data pages of the document 100.

According to one embodiment, document 100 may achieve higher protection against new bogus data pages instead of personalized data pages (e.g., in a stolen passport booklet).

According to one embodiment, greater protection and the ability to automatically verify the authenticity of personal data and/or document data (e.g., name, age, expiration date, or document number) may be achieved by document 100, particularly by incorporating this data into security feature 107. Furthermore, by using cryptographic encoding of the data, in particular symmetric signatures, a higher protection can be achieved.

Fig. 6 shows a document 600, in particular a single-sheet document, such as a valuable document or a bank note or an identification card, comprising a document page 601 with a window 603 which is light-transmissive in a first wavelength range, a security feature 605 being formed in the transparent window 603 which is readable in a second wavelength range.

The security feature 605 may, for example, be formed in or on a transparent film that forms or covers the transparent window 603. The security feature 605 may have features of the security features described above and/or other security features.

The security feature 605 is light-transmissive, light-reflective or light-absorbing in a first wavelength range, for example in the ultraviolet wavelength range or the white wavelength range. In contrast, the security feature 605 may be light absorbing, light reflecting or light transmitting in the second wavelength range, for example in the infrared wavelength range, so that the security feature 605 may be read in the first or second wavelength range.

Document 600 may be read by document reader 300.

FIG. 7 illustrates a file 600 according to another embodiment. File 600 has a second file page, not shown, disposed behind file page 601. Another security feature 701 is provided on the second document page and is visible through a transparent window 603. The security feature 605 and the further security feature 701 are complementary to each other in the transparent window 603. Thus, when two pages of document 600 are properly superimposed, a complete security feature or pattern may be generated accordingly. This makes the verification of the file 600 particularly simple.

Claims

1. A document (100), comprising:

a first document page (101) having a transparent window (103) which is light-transmissive;

a second document page (105) having a security feature (107) arranged in a predetermined area, wherein the position of the predetermined area on the second document page (105) corresponds to the position of the transparent window (103) of the first document page (101) such that the security feature (107) is readable through the transparent window (103) when the first document page (101) and the second document page (105) are brought together,

wherein a further security feature is formed in the transparent window (103) and the security feature (107) and the further security feature are complementary in the transparent window, such that when two pages (101, 105) of the document are properly superimposed a complete security feature or pattern is created,

the further security feature being light-transmissive in a particular wavelength range, such that the security feature can be read by means of the further security feature,

the further security feature being light-absorbing or light-reflecting in a further wavelength range, such that the further security feature can be read in the further wavelength range,

the security feature or the further security feature may be read wholly or completely in the visible wavelength range, while only a part of the security feature or the further security feature may be read in the infrared wavelength or ultraviolet wavelength range, thereby forming a matrix with an infrared region or an ultraviolet region encoding data of the document.

2. Document (100) according to claim 1, wherein the security feature (107) is readable by light in the visible wavelength range, the infrared wavelength range or the ultraviolet wavelength range.

3. Document (100) according to claim 1, characterized in that said security feature (107) comprises a code.

4. A document (100) according to claim 3, wherein the document (100) is a personal identification document and the code comprises encoded personal data.

5. A document (100) according to claim 3, characterized in that said code comprises information coded using one of the following methods:

a digital signature of the encoded information, an asymmetric encoding of the information using an encryption key, or a symmetric encoding of the information using an encryption key;

or the code includes a checksum or hash value.

6. Document (100) according to claim 5, characterized in that said code comprises coded personal data.

7. Document (100) according to claim 5, wherein the code comprises a check or hash value of the personal data, the document data or a part of the personal data or a part of the document data.

8. Document (100) according to claim 3, 4 or 5, characterized in that the code is an optically detectable code.

9. Document (100) according to claim 8, wherein the code is a barcode or a multidimensional code.

10. Document (100) according to claim 1, wherein the document (100) is an identity document of an individual and has document pages comprising personal data, wherein the security feature (107) contains or provides the personal data.

11. Document (100) according to claim 10, wherein the security feature (107) contains or provides the personal data in encoded form.

12. A document (600) with a document page (601), characterized in that it comprises a transparent window (603) which is light-transmissive in a first wavelength range, wherein a security feature (605) is formed in the transparent window (603), which security feature is readable in a second wavelength range,

wherein the security feature is fully or completely readable in the visible wavelength range and only a portion of the security feature is readable in the infrared or ultraviolet wavelength range, thereby forming a matrix having an infrared or ultraviolet region that encodes data of the document.

13. A document reader (300) for reading a security feature (107) of a document (100), characterized in that the document (100) comprises a first document page (101) having a light-transmissive transparent window (103) and a second document page (105) having the security feature (107), wherein the security feature (107) is arranged in a predetermined area, the position of the predetermined area on the second document page (105) corresponding to the position of the transparent window (103) of the first document page (101) such that the security feature (107) can be read through the transparent window (103) when the first document page (101) and the second document page (105) are brought together, wherein a further security feature is formed in the transparent window (103) and the security feature (107) and the further security feature are complementary in the transparent window, so that when two pages (101, 105) of the document are properly superimposed a complete security feature or pattern is produced, the further security feature being light-transmissive in a particular wavelength range, such that the security feature can be read by means of the further security feature, the further security feature being light-absorbing or light-reflecting in a further wavelength range, such that the further security feature can be read in the further wavelength range, the security feature or the further security feature may be read wholly or completely in the visible wavelength range, whereas only part of the security feature or the further security feature may be readable in the infrared or ultraviolet wavelength range, thereby forming a matrix having the infrared or ultraviolet region, the matrix encodes data of the document, the document reader (300) comprising:

an imaging device (301) for optically detecting the transparent window (103) to obtain an image containing the security feature (107); and

a processor (303) for detecting the security feature (107) based on the image,

wherein the imaging device (301) is configured to take an image of the transparent window (103) in the further wavelength range for detecting the further security feature,

the imaging device (301) is configured to take an image of the transparent window (103) in the specific wavelength range to detect the security feature (107).

14. The document reader (300) of claim 13, wherein said processor (303) is configured to determine a position of said transparent window (103) in said image and detect said security feature (107) at a particular position of said transparent window (103).

15. The document reader (300) of claim 14, wherein said processor (303) is configured to detect the position of said transparent window (103) in said image by identifying an edge or contour of said transparent window (103).

16. The document reader (300) of claim 13, further comprising a light source designed to illuminate said security feature (107) through said transparent window (103).

17. The document reader (300) of claim 16, wherein said light source is a white light source, an infrared light source, or an ultraviolet light source.

18. The document reader (300) according to claim 13, characterized in that said imaging device (301) is constituted by a camera or a scan line.

19. A method (500) for reading a security feature (107) of a document (100), characterized in that the document (100) comprises a first document page (101) with a light-transmissive transparent window (103) and a second document page (105) with the security feature (107), wherein the security feature (107) is arranged in a predetermined area, the position of the predetermined area on the second document page (105) corresponding to the position of the transparent window (103) of the first document page (101) such that the security feature can be read through the transparent window (103) when the first document page (101) and the second document page (105) are brought together, wherein a further security feature is formed in the transparent window (103) and the security feature (107) and the further security feature are complementary in the transparent window, so that when two pages (101, 105) of the document are properly superimposed a complete security feature or pattern is created, the further security feature being light transmissive in a specific wavelength range so that the security feature can be read through the further security feature, the further security feature being light absorbing or light reflecting in a further wavelength range so that the further security feature can be read in the further wavelength range, the security feature or the further security feature being fully or completely readable in the visible wavelength range, while only a part of the security feature or the further security feature is readable in the infrared or ultraviolet wavelength range, thereby forming a matrix with an infrared or ultraviolet region encoding data of the document, the method comprising:

optically inspecting (501) the transparent window (103) to obtain an image comprising the security feature (107); and

detecting (503) the security feature (107) based on the image,

wherein an image of the transparent window (103) is taken in the further wavelength range to detect the further security feature; and

-taking an image of the transparent window (103) in the specific wavelength range for detecting the security feature (107).