• 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:
    Fig. 1
    公开号:SE1650034A1
    申请号:SE1650034
    申请日:2016-01-13
    公开日:2017-07-14
    发明作者:Rosqvist Fredrik
    申请人:Precise Biometrics Ab；
    IPC主号:
    专利说明:

    A METHOD FOR UPDATING BIOMETRIC REFERENCE DATA TECHNICAL FIELDThe present invention generally relates to a method of updating referencebiometric data to be used for subsequent biometrics matching.
    BACKGROUND Use of small biometric sensors, i.e. sensors that do not collect biometric dataabout the Whole biometric object, may be desired due to constraints caused by e. g.physical design of an apparatus used to collect the biometric data. Due to the small sizeof the biometric sensor in view of the Whole biometric object, e. g. a fingerprint,normally several biometric templates are required to be stored or reconstructed asreference or multi-template data for subsequent matching. Since the biometric objectmay change over time, e. g. due to ageing, environmental impacts etc, it may beadvantageous to update the reference data. Some known solutions allow for a so calledautomatic updating of the multi-template or reference data With data relating to eachmatched biometric template. Such an automatic update is associated With the risk thatan imposter's template in the event of an erroneous successful match, Would end up inthe reference multi-template.
    Hence, it Would be advantageous to provide an improved method of updating a biometric multi-template or reference data.
    SUMMARY An object of the invention is to at least alleviate the above stated problem.
    According to an aspect a method for updating biometric reference data for aperson is provided, Wherein the biometric reference data is defined as a multi-templateformed by a number of templates each representing an area of an associated biometricobject of the person. The method comprises providing at least one template associatedWith a biometric image that depicts at least one area of a finger of the person. Moreover,the method comprises matching the at least one template to the multi-template of thebiometric reference data and in the event of a match. Furthermore, the methodcomprises updating the multi-template of the biometric reference data With at least oneselected previously matched template stored in a candidate template queue. Moreover,the method comprises storing the matched template in the candidate template queue.
    Other objectives, features and advantages of the present invention will appearfrom the following detailed disclosure, from the attached dependent claims as well asfrom the drawings. Generally, all terms used in the claims are to be interpretedaccording to their ordinary meaning in the technical field, unless explicitly definedotherwise herein. All references to "a/an/the [element, device, component, means, step,etc]" are to be interpreted openly as referring to at least one instance of said element,device, component, means, step, etc., unless explicitly stated otherwise. The steps ofany method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
    BRIEF DESCRIPTION OF THE DRAWINGSThe above, as well as additional objects, features and advantages of the presentinvention, will be better understood through the following illustrative and non-limitingdetailed description of preferred embodiments of the present invention, with referenceto the appended drawings.
    Fig. l is a flow chart schematically illustrating a method of updating areference biometric data; Fig. 2 schematically shows how a template from a candidate template queue isselected for updating the reference multi-template; Fig. 3 schematically shows that a template from a candidate template queue isdeleted therefrom after it has been used to update the reference multi-template; Fig. 4 schematically shows the appearance of the candidate template queuewhen the template of Fig. 3 has been deleted; and Fig. 5 schematically shows the general alignment of a number of templatesstored in a candidate template queue.
    DESCRIPTION Biometrics is used for recognising and/ or authenticating individuals fromphysiological characteristics. A certain biometric object, such as fingerprint, face, iris,vein pattern, hand, foot, retina, etc. is normally chosen for a biometric comparison, i.e.biometric matching, although combined systems may be applied, i.e. where two or morebiometric objects are used for the matching. lt is here to be noted that matching isperformed by processing means such as signal processing, digital processing, etc.,wherein biometric data from the biometric object is considered. Thus, within the processing means, only data representing the biometric object is present, wherein the way of representing the biometric object is important. Furthermore, the term “template”is used within the field of biometric matching, which refers to an enrolled representationof a biometric object which may be stored for a later comparison with a biometric“sample” to determine if the sample emanates from the same biometric object as thetemplate, i.e. matching. Within biometrics, it is often referred to the term “features”.Features are also often divided into level one features, such as quality or orientationfield features of the biometric object, level two features, such as minutiae or otherfeatures describing sub-objects of the biometric object, and level three features, such aspores or other highly detailed elements of the biometric object. One or more levels offeatures may be used for biometric matching.
    In general, biometric reference data to which each template is compared duringmatching is defined as a multi-template formed by a number of templates of one ormore authorized users. However, the multi-template of the biometric reference data isnot static. For example, fingerprints of an authorized user may change over time,thereby increasing the risk of a mismatch unless the multi-template is also updated fromtime to time.
    Some known solutions of updating the multi-template allows any matchedtemplate to update the multi-template. These are associated with the risk that animposter's template in the event of an erroneous successful match, would end up in thereference multi-template. Hence, once an imposter's template has been successfullymatched, and the reference multi-template has been updated with the associatedimposter template, this means that the chances of a future successful match increases.Hence, there is a need for improving the way the reference multi-template is updatedsuch as to limit risk of an imposter to successfully update the reference multi-templatewith his/her imposter template.
    The biometrics data referred to herein may relate to fingerprint data.
    Fig. 1 shows a flowchart of a method 10 for updating a biometric referencedata for a person. As above, the biometric reference data comprises is defined as amulti-template comprising a number of templates each representing an area of anassociated biometric object of the person. The method 10 comprises providing 11 atleast one template associated with a biometric image that depicts at least one area of afinger of the person. The method further comprises matching 12 the at least onetemplate to the multi-template of the biometric reference data and in the event of amatch, the method further comprises updating 13 the multi-template of the biometric reference data with at least one selected previously matched template stored in a candidate template queue. The method further comprises storing 14 the matchedtemplate in the candidate template queue.
    By the provision of a candidate template queue any successfully matchedtemplate Will not be immediately updated into the multi-template of the reference data,and at least it Will take longer time before an imposter's successfully matched templateWill end up in the multi-template.
    Moreover, by using a candidate template queue it is also possible to carefullychoose Which stored templates in the queue that should be selected for updating of themulti-template.
    Selecting the stored template for updating of the multi-template As shown in Fig. 1 the method may optionally comprise selecting (131) the atleast one previously matched template stored in the candidate template queue based onat least one property of said previously matched template including its associated orderin the candidate template queue.
    Referring to the associated order, the previously matched template selected forupdating may relate to the oldest template stored in the candidate template queue.
    The at least one property taken into account before selecting a certain templatepreviously stored in the template candidate queue may relate to the certain template'ssimilarity to other templates stored in the candidate template queue. Hence, for theevent that an imposter's matched template has been stored in the candidate templatequeue, unless provisions are made, it is open for selection to update the reference multi-template. However, in order to reduce this risk, a similarity check may be conducted,Where a template open for selection is compared, e. g. in terms of general alignment ofthe template, to the at least one other or all templates stored in the candidate templatequeue, and if the template open for selection does not significantly differ from the atleast one other stored candidate template, said template may be selected for updating thereference multi-template.
    Fig. 5 shoWs schematically the general alignment of a number of templatesstored in the candidate template queue. As seen templates nos. 2 to N have a generalalignment Which is tilted clockWise, Whereas Template No. 1 is tilted counter clockwise.In this situation, by conducting a similarity check in terms of general alignmentTemplate No. 1 may be dismissed from selection for updating the reference multi-template, although it may refer to the oldest stored template in the candidate template queue.
    For example, When the biometric data refers to a fingerprint, a check forgeneral alignment is advantageous since the general alignment of the authorized usertemplates is mostly very similar, since the user tend to position his/her finger in roughlythe same Way over the f1ngerprint sensor for accessing the reference data. On the otherhand, an imposter's template may Well be out of alignment compared to the authorizeduser templates, and by performing the similarity check it is possible to dismiss"misaligned" templates suspected to be an imposter's template from being selected forupdating the reference multi-template.
    In an embodiment, the similarity check is performed in associate With theselecting 131 When a predetermined number of templates are stored in the candidatetemplate queue.
    Unless an imposter steals a device being provided With biometric matchingcapabilities and thereby removes it from the scene, most times an imposter only havelimited time intervals to try to access the authorized data being protected by thebiometric authentication system. For example, by selecting the oldest stored template ofthe candidate template queue the risk that the imposter's template Will be updated intothe multi-template decreases. Since the imposter's template is not updated in thereference multi-template the chances for the imposter to successfully accessing theauthorized data at a second instance is not increased. Hence, the candidate templatequeue significantly improves the safety compared to solutions Where the matched templates are automatically updated into the reference multi-template.
    Updating the multi-template With candidate templates In an embodiment, the updating 13 is executed When a predetermined numberof matched templates, e. g. 3 to 50, have been stored in the candidate template queue.Since no updating Will occur before this predetermined number of successfully matchedtemplates have been stored in the candidate template queue, this Will mean that the timebefore a potential imposters template could be updated into the multi-template Willincrease With an increasing predetermined number. With reference to Fig. 2, When apredetermined number n of successfully matched templates have been stored in thecandidate template queue, in this case template 1, the first stored in the candidatetemplate queue is selected for updating the reference multi-template.
    Deleting templates stored in the candidate template queue Once the multi-template has been updated With a selected stored template fromthe candidate template queue, said selected stored template may be deleted or removedfrom the candidate template queue. As seen With reference to Fig. 1 the method 10comprises an optional block 15 of deleting the template selected for updated from thecandidate template queue upon completion of the updating. With reference to Figs 2 and3, as seen in Fig. 3 "Template 1" can be deleted When "Template 1" has been updatingthe multi-template of Fig. 2.
    In the event, a predeterrnined number of successfully matched templates arerequired for updated the multi-template, When "Template 1" is deleted one additionalsuccessfully matched template needs to the be stored to the candidate template queuebefore any further updating is possible.
    Storing successfully matched templates in the candidate template queue In an embodiment, the storing 14 is executed provided that the matchedtemplate has a feature being similar to, i.e. not significantly differing from, at least oneother template stored in the candidate template queue. Such a feature may be related tothe general alignment of the template. Hence, in the event the alignment of the matchedtemplate differs from the alignment of at least one stored candidate template, thematched template Will not be stored into the candidate template queue. It is also possibleto take into account the general alignment, i.e. mean alignment, of the stored candidatetemplates of the candidate template queue. Hence, as long as the alignment of thematched template does not significantly differ from the general alignment of the storedcandidate templates, said matched template Will be stored into the candidate templatequeue.
    Altematively or additionally, the storing 15 and/ or updating 13 is/ are executedat random intervals, i.e. not for every single matched template, thereby making it lesslikely that an imposter's template is stored in the candidate template queue.
    The storing 15 and/or updating 13 could altematively also be executed atscheduled time Windows, i.e. not for every single matched template.
    权利要求:
    Claims (10)
    [1] 1. A method (10) for updating biometric reference data for a person, Whereinthe biometric reference data is defined as a multi-template formed by a number oftemplates each representing an area of an associated biometric object of the person,comprising providing (11) at least one template associated With a biometric image thatdepicts at least one area of a finger of the person, matching (12) the at least one template to the multi-template of the biometricreference data and in the event of a match, updating (13) the multi-template of the biometric reference data With atleast one selected previously matched template stored in a candidate template queue;and storing (14) the matched template in the candidate template queue.
    [2] 2. The method according to claim 1, further comprising selecting (131) the atleast one previously matched template stored in the candidate template queue based onat least one property of said previously matched template including its associated orderin the candidate template queue.
    [3] 3. The method according to claim 1 or 2, Wherein at least one of the previouslymatched templates selected for updating relates to the oldest template stored in the candidate template queue.
    [4] 4. The method according to any of the previous claims, further comprisingdeleting (15) the at least one selected template from the candidate template queue uponcompletion of the updating.
    [5] 5. The method according to any of the previous claims, Wherein the updating isexecuted When a predetermined number of matched templates have been stored in the candidate template queue.
    [6] 6. The method according to any of the previous claims, Wherein the storing isexecuted provided that the matched template does not sigif1cantly differ in terms of general alignment, compared to a reference level, from at least one other template stored in the candidate template queue.
    [7] 7. The method according to any of the previous claims, Wherein the storing 14and/ or updating 13 is executed at random intervals, i.e. not for every single matchedtemplate, thereby making it less likely that an imposter's template is stored in the candidate template queue.
    [8] 8. The method according to any of the previous claims, Wherein the storing 14and/ or updating 13 is executed at scheduled time Windows, i.e. not for every single matched template.
    [9] 9. The method according claim 2, Wherein one property taken into accountbefore selecting a certain template previously stored in the template candidate queuerelates to the certain template's similarity in terms of general alignment to other templates stored in the candidate template queue.
    [10] 10. The method according any one of the claims 1 to 9, Wherein the biometric data relates to fingerprint data.
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    同族专利:
    公开号 | 公开日
    CN108369632A|2018-08-03|
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    KR20180102574A|2018-09-17|
    SE539528C2|2017-10-10|
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    引用文献:
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    SE1451336A1|2014-11-07|2016-05-08|Fingerprint Cards Ab|Enrolling templates for biometric authentication|
    US10277400B1|2016-10-20|2019-04-30|Wells Fargo Bank, N.A.|Biometric electronic signature tokens|US11240233B2|2017-12-22|2022-02-01|Mastercard International Incorporated|Systems and methods for provisioning biometric image templates to devices for use in user authentication|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650034A|SE539528C2|2016-01-13|2016-01-13|A method for updating biometric reference data|SE1650034A| SE539528C2|2016-01-13|2016-01-13|A method for updating biometric reference data|
    KR1020187019827A| KR20180102574A|2016-01-13|2016-12-19|How to update biometric criteria data|
    CN201680061904.2A| CN108369632A|2016-01-13|2016-12-19|Method for updating biometric reference data|
    PCT/EP2016/081717| WO2017121580A1|2016-01-13|2016-12-19|A method for updating biometric reference data|
    EP16822659.5A| EP3403215A1|2016-01-13|2016-12-19|A method for updating biometric reference data|
    US16/067,993| US10963714B2|2016-01-13|2016-12-19|Method for updating biometric reference data|
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