• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention discloses an authentication method using a surface paper texture. The method includes steps of capturing an image of a topographic pattern (300) of a surface of a region of interest of the paper artifact and extracting a plurality of specific features (301, 302, 303) from the captured image of the topographic pattern. The method further identifies the location of the specific features of the paper artifact from the captured image of the topographical pattern. A bitmap of the identified location of the specific features is generated. Then, a reference image of a reference bitmap printed on the area of interest of the paper artifact is picked up. Finally, the method compares the generated bitmap with the recorded reference bitmap to produce a score. The score of the comparison determines the degree of authentication. The present invention provides an offline authentication method.
    公开号:CH710713A2
    申请号:CH00189/15
    申请日:2015-02-13
    公开日:2016-08-15
    发明作者:Alejandro Breton Alex
    申请人:Paper Dna Ag；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION
    The present invention relates to the field of object authentication, and more particularly to a method of authenticating a paper-based artifact; the method using the image of the topographical pattern on the surface of a paper-based artifact for offline authentication.
    GENERAL PRIOR ART
    Authentication methodologies have been used and applied primarily in the field of biometric authentication. The need to authenticate people has been around for a long time. The events that trigger such a requirement vary from financial transactions to entry into a foreign country, voting, conducting an exam, starting a business, etc. Biometric authentication methods use the inherent and unique characteristics of individuals. Fortunately, humans are made up of complex organic systems that have a high degree of uniqueness. The organic feature most commonly used for authentication purposes has been fingerprints. More advanced methods can use the irises of the human eye, blood vessel patterns hidden under the skin of the hand, and the face. Other methods involve the use of speech. Most of these methods are based on image processing and recognition. These are possible because of the great diversity of features in the human body.
    In a simple document or a normal package, however, such great diversity does not exist. In fact, two documents or two packets of the same size look identical at first sight. There is no obvious alternative to the naked eye to distinguish two identical documents if no specific markings are printed or written on them.
    However, there is a less obvious, though extremely robust, alternative for distinguishing not only seemingly identical sheets of paper or packages but also small specific areas within the same sheet of paper or package.
    It is known by various researches and by existing invention in the same field that the inherent microstructure of a paper pulp based product is so unique that a few square centimeters have enough detail to produce a very robust authentication methodology. There are many prior art teachings that use paper surface texture to authenticate products; however, most use an online authentication method. The existing offline authentication method does not make use of the paper surface texture.
    U.S. Patent No. US-A-7 806 322 discloses an authentication method which generally relates to steganography and digital watermarking. The method includes receiving an object that includes a host object and ancillary data that is steganographically embedded in the host object; determining geometric characteristics of the host object with respect to expected geometric characteristics of the host object and detecting the additional data from the host object. The method may further include realigning or correcting geometrical characteristics of the object based on a result of the process of determining prior to the process of detecting. This method does not use paper surface texture.
    WIPO Patent Application 2014 163 014 A1 discloses an information acquisition / identification system provided with image feature storage means, extraction means, detection means and identification means. The image feature storage means stores image features of texture patterns formed on components or products. The extracting means extracts an informational label image and a texture pattern image from a captured image containing at least the following: an informational tag indicating information relating to a component, a product or a product comprising the component; and a texture pattern formed on the component or the product. The detecting means acquires the above-mentioned information regarding the component or the product from the extracted information label image. The identifying means identifies the component, the product or the product comprising the component by matching image features of the extracted texture pattern image with the image features stored by the image feature storage means. This invention requires that the images be stored in a database for comparison.
    Thus, there is a need for an offline authentication method that utilizes the topographical pattern on the surface of the paper artifact, the authentication method being cost effective and providing accurate authentication.
    BRIEF SUMMARY OF THE INVENTION
    The invention provides a method for authenticating a paper-based artifact; the method using the image of the topographical pattern on the surface of a paper-based artifact for offline authentication. The authentication method is cost effective and provides high authentication accuracy over existing technology.
    In one embodiment, the invention discloses a method of generating an authentication mark on a paper artifact. The method includes steps of scanning a region of interest of the paper artifact to capture the image of the topographical pattern of the region of interest. The method also includes a step of extracting a plurality of specific features from the captured image of the topographic pattern. The method further comprises a step of identifying the location of each specific feature of the captured image of the topographical pattern. The method also includes a step of generating a bitmap of the identified location of the specific features.
    According to another embodiment, the method further includes a step of printing the generated bitmap directly to at least one of the regions of interest or any other location. The specific features of the captured image of the topographic pattern include a valley, a hill and / or a bend of the topographical pattern.
    According to another embodiment, the method further includes a step of printing a bar code on the area of interest or at a location in the vicinity. The bar code could include additional information, such as product information to which the authentication mark was applied, or ciphered or encrypted information of any kind.
    In another embodiment, the invention discloses a method of authenticating a paper artifact. The method includes a step of capturing an image of a topographic pattern of a region of interest of the paper artifact. The method also includes a step of extracting the specific features from the captured image of the topographic pattern. The method further performs a step of identifying the location of the specific features of the captured image of the topographical pattern. The method also includes a step of generating a bitmap of the identified location of the specific features. The method further captures the bitmap printed on the area of interest of the object and then compares the generated bitmap with the captured bitmap.
    According to another embodiment, the authentication is based on the score generated after comparing the generated bitmap with the captured bitmap. The method further includes a step of scanning the bar code printed on the area of interest or nearby. The image of the bitmap and the topographic pattern are captured using light of different wavelengths.
    The present invention provides an offline method for authenticating a paper artifact that can be used to authenticate various articles or products or documents. The authentication process is cost effective and provides accurate authentication. The present invention greatly aids in checking counterfeiting.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The foregoing and other features of embodiments will become more apparent from the following detailed description of embodiments when read in conjunction with the accompanying drawings. Elements in the figures have not necessarily been drawn to scale to aid their clarity and to improve the understanding of these various elements and embodiments of the invention. Consequently, the form of the drawings is generalized in the interests of clarity and brevity, wherein:<Tb> FIG. 1 illustrates a block diagram of the method for generating an authentication mark on a paper artifact in accordance with an embodiment of the invention.<Tb> FIG. 2 <SEP> illustrates a flow chart for the method of authenticating a paper artifact according to an embodiment of the invention.<Tb> FIG. 3a <SEP> represents the captured topographic image according to an embodiment of the invention.<Tb> FIG. 3b <SEP> represents the topographical image together with the location identified on the basis of the specific features according to an embodiment of the invention.<Tb> FIG. 4a <SEP> represents a bitmap generated on the basis of the locations identified from the specific features according to an embodiment of the invention.<Tb> FIG. FIG. 4b illustrates the bitmap printed directly on the surface of a region of interest according to an embodiment of the invention. FIG.<Tb> FIG. Figure 5a shows a region of the paper artifact with a bitmap printed on the surface according to one embodiment of the invention.<Tb> FIG. FIG. 5b illustrates a reference bitmap image taken from the region of interest in accordance with an embodiment of the invention. FIG.<Tb> FIG. Figures 6a and 6b illustrate how a comparison is made between each bit of the captured reference bitmap image and the generated bitmap in accordance with an embodiment of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
    In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments which may be practiced. These embodiments are described in sufficient detail to enable one skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that logical, mechanical, and other changes may be made within the scope of the embodiments. The following detailed description is therefore not to be taken as limiting the scope of the invention, but instead the invention should be defined by the appended claims.
    The present invention discloses a method of authenticating a paper artifact utilizing an image of a topographical pattern of the paper artifact microstructure. The image of the topographic pattern of the paper-based artifact's microstructure is used for offline authentication of the paper-based artifacts. The term paper artifacts includes paper as well as paper-based artifacts.
    Fig. 1 illustrates a block diagram of the method for generating an authentication mark on a paper artifact according to an embodiment of the invention. The method includes the step (102) of scanning a region of interest of the paper artifact to obtain the image of the topographic pattern of the region of interest. The image of the topographic pattern has the surface microstructure of the paper artifact. The surface microstructure is visible when light rays fall at an angle on the surface of the paper artifact. The image of the topographical pattern of the region of interest is taken by the device which can take such an image. The area of interest may be any area on the surface of the paper artifact for which the authentication mark is generated. Once the image of the topographic pattern has been captured, the next step (104) is to extract specific features of the area of interest. The specific features are based on the bends of hills and valleys formed on the captured image when the light falls on the paper artifact at a certain angle based on the device used to pick up the topographical image. The hills and valleys are formed when shadows are cast from the fibers in the paper surface, based on the angle at which the encoder / decoder light source strikes the paper surface. The encoder together with a printer is used to generate the authentication mark, whereas a decoder is used to authenticate the paper artifact. The decoder may also include an encoder. Once the features have been specifically extracted, the next step (106) is to identify the location of each of the specific features of the captured image of the topographic pattern. For a particular area of interest, a series of locations are identified based on the curvature of the peaks and valleys of the surface microstructure of the paper artifact from the captured image of the topographical pattern. After identifying various locations, the next step (108) is to generate a bitmap of the identified locations. The method also includes a step of printing the generated bitmap either on the area of interest or at any other location on the paper artifact. The method also includes a step of printing a bar code on the area of interest. The bar code may include additional information about the product or document or object that is part of the paper artifact. For example, if the paper artifact is used to package a product, the bar code may include information about the product or any encryption or decryption code required for the encoding device to read the bitmap printed on the paper artifact.
    According to one embodiment of the invention, the bitmap can be printed with an ink, wherein the ink is visible only in a certain wavelength.
    In another embodiment, the invention discloses a method for authenticating a paper artifact. Figure 2 illustrates a flow chart for the method of authenticating a paper artifact. The method includes a step (202) of capturing an image of a topographic pattern of a region of interest of the paper artifact. The region of interest may be marked for easy identification of the region of interest. Once the topographic pattern has been captured, the next step (204) is to extract several specific features from the captured image of the topographic pattern. The specific features are based on the bends of the hills, valleys of the surface microstructure of the paper artifact. Once the specific features have been identified, the next step (206) is to identify the location of the specific features of the captured image of the topographic pattern. And in the next step (208), a bitmap is generated for the identified locations of the specific features. The location may be the point of a bend in the hill or valley of the surface texture pattern. Once the bitmap has been generated, the next step (210) includes the reference bitmap image that is in the region of interest, and the method includes a further step (212) of comparing the generated bitmap with that of the region of interest of the paper artifact recorded reference bitmap. The comparison of the generated bitmap with respect to the reference bit map captured by the region of interest provides a score as a percentage of feature matching and a noise level. Authentication of the object is determined based on the score values. For example, if the score value is more than 80%, the object is an authentic object; the degree of authentication decreases as the score decreases. The actual limits for determining authenticity are obtained by the statistical processing of a large number of known samples.
    According to one embodiment of the invention, the image of the reference bitmap and the topographic pattern of the paper artifact is recorded using light of different wavelengths. The reason for this is to get a clear picture of the topographic pattern of the paper artifact.
    The method as described above involves a series of steps and their order of execution in the embodiments of the invention shown and described herein is not essential, unless otherwise specified. That is, the steps may be performed in any order unless otherwise specified, and embodiments of the invention may involve additional or fewer steps than those disclosed herein. It may be envisioned that performing or performing a particular step before, simultaneously with, or after another step is within the scope of the invention. In particular, in the method for authenticating a paper artifact, it is quite possible to have the step of generating a bitmap for the region of interest after picking up the bitmap image in the area of interest.
    Fig. 3a illustrates the captured image of the topographical pattern (300) according to an embodiment of the invention and Fig. 3b illustrates the topographical image along with the location identified based on the specific features. The locations are using white squares in the image of the topographic pattern (300). Numerous numbers of digits are identified, with one digit (301), one digit (302), and one digit (303) being a few such digits. A bitmap is generated based on the identified locations as shown in FIG. 4a. The bitmap is generated while avoiding the edges of the paper artifact area of interest. Thereafter, the generated bitmap is printed on the area of interest of the paper artifact as shown in Fig. 4b. Here each bit of the bitmap is printed exactly on the location of the specific feature.
    Fig. 5a illustrates a portion of the paper artifact with a bit map printed on the surface. The authentication method captures the bitmap reference image in visible light to obtain a reference bitmap image, as shown in Fig. 5b. In the next step, the process resumes the topographic image as in Fig. 3a using an appropriate wavelength of light so that the printed bitmap is not visible. From the captured topographic image, a bitmap is generated, as discussed in the method for generating an authentication mark, using the specific features and location of the specific features. After generating a bitmap, a comparison is made as shown in Figures 6a and 6b to compare each bit of the captured reference bitmap image and the generated bitmap. A score is generated based on the bitwise comparison. The authentication of a paper artifact is determined based on the score of the comparison; the higher the score of the comparison, the more authentic the paper artifact. Limits are determined by statistical processing of a large number of known samples.
    The present invention provides an offline method for authentication of a paper artifact that can be used to authenticate various articles or products or documents. The present invention does not involve storing an image of a topographic pattern in a database. As a result, the authentication method is cost effective and provides high authentication accuracy. The present invention greatly aids in checking counterfeiting.
    The foregoing description of the preferred embodiment of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teachings. It is intended that the scope of the present invention not be limited by this detailed description.
    权利要求:
    Claims (8)
    [1]
    A method of generating an authentication mark on a paper artifact, the method comprising the steps of:Scanning a region of interest of the paper artifact to capture the image of the topographical pattern of the region of interest;Extracting a plurality of specific features from the captured image of the topographic pattern;Identifying the location of each specific feature from the captured image of the topographical pattern andGenerating a bitmap of the identified location based on the specific features.
    [2]
    The method of claim 1, wherein the method further comprises a step of printing the generated bitmap directly to the area of interest and / or to any other location.
    [3]
    The method of claim 1, wherein the method further includes a step of printing a bar code on the area of interest.
    [4]
    4. The method of claim 1, wherein specific features of the captured image of the topographical pattern include a valley, a hill and / or a bend of the topographical pattern.
    [5]
    5. A method of authenticating a paper artifact, the method comprising the steps of:- capturing an image of a topographic pattern of a surface of a region of interest of the paper artifact;Extracting a plurality of specific features from the captured image of the topographic pattern;- identifying the location of the specific features of the captured image of the topographical pattern;Generating a bitmap of the identified location of the specific features;- capturing a reference image of a reference bitmap printed on the area of interest of the paper artifact; andCompare the generated bitmap with the recorded reference bitmap to generate a score.
    [6]
    The method of claim 5, wherein the authentication is determined on the basis of the score generated by the step of comparison.
    [7]
    The method of claim 5, wherein the method further includes a step of scanning a bar code printed on the area of interest.
    [8]
    The method of claim 5, wherein the image of the reference bitmap and the topographic pattern is captured using light of different wavelengths.
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    同族专利:
    公开号 | 公开日
    WO2016128196A1|2016-08-18|
    US20180039831A1|2018-02-08|
    CN107533631A|2018-01-02|
    EP3256984A1|2017-12-20|
    CH710713B1|2021-08-31|
    US20200250422A1|2020-08-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US11115118B2|2016-05-18|2021-09-07|Colop Digital Gmbh|Method to authenticate a substrate using speckle patterns and a device to perform the method|
    FR3064092A1|2017-03-14|2018-09-21|Kerquest|METHOD FOR DIGITAL MESSAGING ASSOCIATING A MESSAGE TO A MATERIAL SUBJECT|
    CN110599665B|2018-06-13|2021-08-24|深圳兆日科技股份有限公司|Paper pattern recognition method and device, computer equipment and storage medium|
    法律状态:
    2020-10-15| PFA| Name/firm changed|Owner name: PAPER DNA AG, CH Free format text: FORMER OWNER: PAPER DNA AG, CH |
    优先权:
    申请号 | 申请日 | 专利标题
    CH00189/15A|CH710713B1|2015-02-13|2015-02-13|Authentication method using surface paper texture.|CH00189/15A| CH710713B1|2015-02-13|2015-02-13|Authentication method using surface paper texture.|
    US15/550,549| US20180039831A1|2015-02-13|2016-01-21|Method of authentication using surface paper texture|
    PCT/EP2016/051259| WO2016128196A1|2015-02-13|2016-01-21|Method of authentication using surface paper texture|
    CN201680010156.5A| CN107533631A|2015-02-13|2016-01-21|Use the verification method of surface paper texture|
    EP16702353.0A| EP3256984A1|2015-02-13|2016-01-21|Method of authentication using surface paper texture|
    US16/734,675| US20200250422A1|2015-02-13|2020-01-06|Method of authentication using surface paper texture|
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