EP4026053A1 - Improved authentication method - Google Patents
Improved authentication methodInfo
- Publication number
- EP4026053A1 EP4026053A1 EP20781045.8A EP20781045A EP4026053A1 EP 4026053 A1 EP4026053 A1 EP 4026053A1 EP 20781045 A EP20781045 A EP 20781045A EP 4026053 A1 EP4026053 A1 EP 4026053A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acquisitions
- authentication method
- lighting
- acquisition
- authentication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000003550 marker Substances 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 4
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 238000012795 verification Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000033458 reproduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/22—Image preprocessing by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition
- G06V10/225—Image preprocessing by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition based on a marking or identifier characterising the area
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/60—Extraction of image or video features relating to illumination properties, e.g. using a reflectance or lighting model
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/19—Image acquisition by sensing codes defining pattern positions
Definitions
- the invention is a secure method for authenticating documents comprising a marking whose appearance changes depending on the point of view from which they are observed or depending on the lighting conditions.
- Patent US20080158258A1 of December 27, 2006 discloses a method comprising the acquisition of a plurality of digital images at least two different lighting levels from a controlled light source, and analyzing the plurality of digital images to obtain an image representing the lighting contribution provided by the controlled light source.
- Patent US7590344B2 of September 15, 2009 (Georg Petschnigg [US] -
- Microsoft describes a process for improving images taken with flash, consisting of acquiring a first image captured with flash and ambient light, then a second image, corresponding to the first image, captured with ambient light, and using the first image and the second image to create a third image with flash only,
- the object of the present invention is to solve these two problems.
- FIG.1 is the comparison between - on the left - a photograph taken in ambient light and - on the right - a photograph taken in ambient light with an additional light source which is the flash of the acquisition means.
- FIG.2 shows - on the left - the result of the operation of subtracting the acquisition in ambient light from the acquisition carried out under ambient light and an additional light source.
- This so-called differential image represents the effect of the flash, which can also be understood as the calculation of the image after having "killed the ambient light", and - on the right - the differential image calculated with the same method as that used for calculate the image on the left, but in the case where the acquisition means have been moved between the two acquisitions made with and without an additional light source.
- the image on the left is the reference, which could also have been obtained by taking a photograph with only additional lighting, and the one on the right has many defects which have the consequence that it is not representative of this reference. and therefore does not allow the authentication device to be authenticated.
- the marker is the periphery of the printed marking, which deforms according to the perspective, and whose analysis allows the computer to calculate the position of the acquisition means with respect to the authentication device.
- the present invention is an authentication method comprising, with a photographic acquisition means provided with a computer, two photographic acquisitions of an optical authentication device comprising a characteristic marking and a so-called marker means allowing said computer to determine by optical means the point of view under which said photographic acquisition means sees said authentication device, both acquisitions being made under two different lighting conditions, characterized in that the second acquisition is made less than one second after said computer has succeeded in recognizing said marker after the modification of the lighting conditions.
- one of the lighting conditions is ambient lighting and the other additionally includes additional lighting.
- the differential image represents the scene illuminated by the additional lighting only, and it is this image that we compare with a reference image made under the additional lighting only.
- the present invention consists in acquiring the two images at a rate fast enough so that the framing of the acquisition of the marking and the point of view under which it is seen by the acquisition means have not changed too much between the two shots according to the two successive lighting conditions, while ensuring that the computer can recognize the marker and deduce therefrom the position of the photographic acquisition means relative to the authentication device.
- the second acquisition should be made quickly, less than a second after the computer has successfully recognized the marker after changing the lighting conditions, but advantageously, it is started as soon as the computer has successfully recognized this marker. after changing the lighting conditions.
- a shutter speed / lens aperture pair such that an image is obtained under the two lighting conditions which makes it possible to analyze the acquisition of the marker to deduce therefrom the position of the acquisition means relative to the marking.
- the two acquisitions can be performed in as short an interval of time as desired.
- the preferred method for achieving this consists in carrying out a first acquisition under a first lighting condition, and one or more additional acquisitions after having varied the shutter speed and / or the lens aperture as far as. 'so that the computer can no longer determine the position of the acquisition means relative to the marking under the second lighting condition. We then chooses a shutter speed / lens aperture pair located below this limit, making it possible to determine this position under this first lighting condition. We then go to the second lighting condition to verify that the computer can still, with the same shutter speed and the same lens aperture, determine the position of the acquisition means with respect to the marking.
- This first mode of implementation is not always possible because many cameras automatically adjust the shutter speed and / or the aperture of the lens depending on the lighting conditions, and do not allow manual adjustment of shutter speed and / or lens aperture.
- a second mode of implementation consists in this case of additional lighting being switched on intermittently at a rate greater than one cycle per second while photographic acquisitions are made. This has the effect that the acquisition means does not have time to modify its settings too strongly between acquisitions made with and without additional lighting. Successive photographic acquisitions can be done at a very rapid pace. Such intermittent lighting is moreover compatible with the first mode of implementation described above.
- the present invention also relates to an authentication method consisting in establishing according to one or the other of the implementations described above a description called a subsequent 2D description of an authentication device and in comparing it with a description called a 2D reference description of the authentication device, the subsequent 2D description being established from a point of view close to that used to establish the reference 2D description. It thus makes it possible to improve not only the methods described in the aforementioned patent WO2012136902, but also those described in WO2019141915A1, according to which several reference descriptions made from different locations are established, in order to compare a subsequent description with the reference 2D description established since the point of view closest to the one used to establish the subsequent 2D description.
- the author of the present invention has devised a fraud method which consists in making two images one representing the view of the authentication device from a first point of view or under a first lighting condition, and the 'other the view of the same authentication device according to a second point of view or under a second lighting condition, and to present to the acquisition means responsible for the authentication operation the two images one after the other.
- These two images are very easy to reproduce or falsify, and it becomes easy to pretend that we have the original when they are two reproductions which may for example be photographic.
- an improvement of the present invention consists in that the method according to the invention comprises a step of verifying that the two successive acquisitions indeed relate to the same device. authentication.
- the authentication method comprises verifying that all or part of the authentication device is seen by the acquisition means between two acquisitions.
- Verifying that all or part of the authentication device is seen by the acquisition means is advantageously completed by verifying that it is only seen in a single copy. This verification consists in verifying that one does not simultaneously see two parts of the authentication device which are juxtaposed in a way showing that they are not the same authentication device.
- This verification can be carried out randomly. Since the forger cannot predict when this verification will take place, it becomes very risky to use the fraud method that the present invention seeks to prevent.
- the method comprises such a check at least every half a second.
- the method can also include checking that all or part of the authentication device is seen by the acquisition means for all the images successively acquired by it, and that the position of the authentication device in the entire series of the images acquired is consistent with the change in point of view and / or lighting
- the first consists in modifying the lighting conditions between two successive acquisitions to verify that the acquired image is indeed modified in the way in which the authentication device changes appearance depending on the variation in the lighting conditions. considered.
- the second consists in making successive acquisitions with a short opening time of the objective, so as to detect changes in appearance characteristic of an electronic display screen which does not continuously display the values. images but according to a refreshing rhythm of its own.
- this opening time is less than the refresh rate of the most common display screens, that is to say one fiftieth of a second, but the shorter this opening time, the better. is.
- the third consists in modifying between two acquisitions the distance between the acquisition means and the image to be acquired to cause moiré patterns, because the latter are characteristic of the screening resolution of the authentication device, which is the most often very different from that of the electronic display screen.
- a particularly interesting use from an economic point of view is that in which the appearance of all or part of an object or a document is compared to see if this object or document is indeed the one which was originally photographed and registered.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Software Systems (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Collating Specific Patterns (AREA)
- Image Input (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1909856A FR3100621A3 (en) | 2019-09-07 | 2019-09-07 | Differential photographic acquisition process of an authentication device |
FR1910111A FR3100897A3 (en) | 2019-09-12 | 2019-09-12 | Differential photographic acquisition process of an authentication device |
FR2006356A FR3111719A3 (en) | 2020-06-18 | 2020-06-18 | secure authentication process |
PCT/FR2020/000221 WO2021044082A1 (en) | 2019-09-07 | 2020-08-13 | Improved authentication method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4026053A1 true EP4026053A1 (en) | 2022-07-13 |
Family
ID=72659814
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20781045.8A Withdrawn EP4026053A1 (en) | 2019-09-07 | 2020-08-13 | Improved authentication method |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4026053A1 (en) |
WO (1) | WO2021044082A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022171935A1 (en) | 2021-02-11 | 2022-08-18 | Franck Guigan | Deformed optical security devices |
EP4083850A1 (en) | 2021-04-27 | 2022-11-02 | Onfido Ltd | Method for detecting fraud in documents |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7590344B2 (en) | 2006-02-28 | 2009-09-15 | Microsoft Corp. | Adaptive processing for images captured with flash |
US20080158258A1 (en) | 2006-12-27 | 2008-07-03 | General Instrument Corporation | Method and System For Obtaining a Digitally Enhanced Image |
WO2012136902A1 (en) | 2011-04-05 | 2012-10-11 | Franck Guigan | Security barcode |
MY176665A (en) * | 2013-10-11 | 2020-08-19 | Sicpa Holding Sa | Hand-held device and method for authenticating a marking |
CN106682912B (en) * | 2015-11-10 | 2021-06-15 | 艾普维真股份有限公司 | Authentication method of 3D structure |
FR3070082A1 (en) * | 2017-08-08 | 2019-02-15 | Franck Guigan | AUTONOMOUS AUTHENTICATION DEVICE FOR OPTICAL MARKING AND METHODS |
FR3076924A3 (en) | 2018-01-16 | 2019-07-19 | Franck Guigan | METHOD OF AUTHENTICATING A THREE-DIMENSIONAL SIGNATURE |
-
2020
- 2020-08-13 WO PCT/FR2020/000221 patent/WO2021044082A1/en active Application Filing
- 2020-08-13 EP EP20781045.8A patent/EP4026053A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2021044082A1 (en) | 2021-03-11 |
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