CN104463141B - A kind of fingerprint template input method and device based on smart card - Google Patents

A kind of fingerprint template input method and device based on smart card Download PDF

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Publication number
CN104463141B
CN104463141B CN201410821062.9A CN201410821062A CN104463141B CN 104463141 B CN104463141 B CN 104463141B CN 201410821062 A CN201410821062 A CN 201410821062A CN 104463141 B CN104463141 B CN 104463141B
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characteristic data
matching
fingerprint
fingerprint characteristic
preset value
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CN201410821062.9A
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CN104463141A (en
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段文杰
李宗辉
徐泳�
石春光
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北京大唐智能卡技术有限公司
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Abstract

The invention discloses a kind of fingerprint template input method and device based on smart card, including:When the finger for judging user is difficult finger, the fingerprint characteristic data of the second preset value time is obtained;Wherein, the second preset value and the first preset value sum are N;For the fingerprint characteristic data obtained every time, the ratio for matching logarithm with the other fingerprint characteristic datas obtained in addition to this time is calculated respectively;Store the ratio for each matching logarithm being calculated and be ranked up according to size, update the mark number of first K times fingerprint characteristic data from big to small;Wherein, K<N;Mark number is ranked up according to size, fingerprint characteristic data corresponding to the mark number of preceding first preset value from big to small is selected and is stored in as effective fingerprint template in smart card.Technical solution of the present invention improves fingerprint recognition rate.

Description

A kind of fingerprint template input method and device based on smart card

Technical field

The present invention relates to communication intelligent card application technology, espespecially a kind of fingerprint template input method and dress based on smart card Put.

Background technology

In fingerprint recognition system based on smart card, the process of fingerprint matching is divided into two parts completion, and Part I is: The fingerprint image of fingerprint pos machines collection user, which takes the fingerprint, characteristic and passes to finger-print card (i.e. with fingerprint matching algorithm Smart card);Part II is:The data that finger-print card extracts fingerprint pos machines are with the user's of the advance typing of card memory storage Fingerprint characteristic template is matched and matching result is back into fingerprint pos machines, and fingerprint pos machines perform next according to returning result Step operation.

Authentication procedures in fingerprint recognition system are above-mentioned Part II, are the fingerprint characteristic numbers for arriving collection in worksite The process being compared according to the fingerprint characteristic template stored up with smart card memory, if the fingerprint characteristic data and fingerprint template that collect Matching result (also referred to as match the ratio of logarithm, refer to the point that is matched in two groups of fingerprint characteristic datas to sum and available point To the ratio of sum) exceed the threshold value pre-set, then certification passes through.Therefore, the quality height of fingerprint template is to whole fingerprint The practicality of identifying system, has a great impact, such as, due to the fingerprint template quality of storage it is low when, cause in authentication During the fingerprint that collects can not be matched with fingerprint template, that is, the ratio for matching logarithm is less than the threshold value pre-set, so as to It has impact on the certification of identity.

In order to avoid the fingerprint template quality stored during fingerprint typing it is too low caused by problem, a relatively common solution Certainly method is, when for certain user's typing fingerprint template, the disposable multiple fingerprint templates of typing (being usually 2-5), so Can just avoid to a certain extent due to user pressed in fingerprint Input Process mode it is lack of standardization caused by fingerprint template Low-quality problem.Storage size based on smart card, increase storage fingerprint template number and caused by time loss and The consumption of memory space is acceptable.

In the existing fingerprint input method based on smart card, the fingerprint template of collection is not screened, moreover, Using fixed threshold during fingerprint recognition, typically, the fingerprint characteristic data for the not homogeneous that same finger collection arrives (here may be used To be referred to as the different fingerprint set of same finger collection) should with the ratio for matching logarithm of the fingerprint template of smart card memory storage (initial matching threshold value should be referred to as, its theoretical value should 100%), therefore be taken in fingerprint recognition for 80% -90% Threshold range is 80% -90%;But for some special fingers (hereinafter referred to difficult finger), for example because refer to Line has a close grain or other reasonses, causes the fingerprint feature point difference that collects every time big, the difference that same finger collection arrives Fingerprint characteristic numerical value, the ratio for matching logarithm is typically only 50% -60%, even lower.If therefore in this case, If do not handled fingerprint template, the threshold value of fixed 80% -90% is taken, it is clear that the rate that reduces that the match is successful.

The content of the invention

In order to solve the above-mentioned technical problem, the invention provides a kind of fingerprint template input method and dress based on smart card Put, it is possible to increase fingerprint recognition rate.

In order to reach the object of the invention, the invention provides a kind of fingerprint template input method based on smart card, including:

When the finger for judging user is difficult finger, the fingerprint characteristic data of the second preset value time is obtained;Wherein, Two preset values and the first preset value sum are N;

For the fingerprint characteristic data obtained every time, calculate respectively and the other fingerprint characteristics obtained in addition to this time The ratio of the matching logarithm of data;The ratio of each matching logarithm being calculated is stored simultaneously to be ranked up according to size, update from The mark number of small first K times fingerprint characteristic data is arrived greatly;Wherein, K<N;

Mark number is ranked up according to size, selects the mark number pair of preceding first preset value from big to small The fingerprint characteristic data answered is stored in smart card as effective fingerprint template.

Further, also include before this method:

Obtain the fingerprint characteristic data of the first preset value time;

According to the fingerprint characteristic data of the first preset value of acquisition time, whether the finger for judging user is difficult finger.

Further, before the fingerprint characteristic data of the second preset value time is obtained, this method also includes:

The mark number and each fingerprint characteristic data and the other fingers obtained of each fingerprint characteristic data are set The one-to-one relationship of the ratio of the matching logarithm of line characteristic;Wherein, the mark number of each fingerprint characteristic data Initial value is 0.

Further, this method also includes:

The matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively;

Whether the matching threshold for judging to calculate can use;

When matching threshold can use, matching threshold is arranged to of effectively fingerprint template corresponding with fingerprint characteristic data With logarithmic threshold;Otherwise, the matching logarithmic threshold of effectively fingerprint template corresponding with fingerprint characteristic data is arranged to initial With threshold value.

Further, the matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively, including:

The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of the first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;

According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of the first preset value time The matching threshold of secondary fingerprint characteristic data.

Further, whether the matching threshold for judging to calculate can use, including:

Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of the first preset value calculated Whether initial matching threshold value is less than;

When the matching threshold calculated is less than initial matching threshold value, the finger of the 3rd preset value time in fingerprint database is obtained Line characteristic;

By the fingerprint characteristic data of the 3rd preset value in the fingerprint database of acquisition one by one with calculating the matching threshold obtained Corresponding effectively fingerprint template carries out matching and obtains matching fraction;

When each matching fraction of acquisition is respectively less than matching threshold, then judge that matching threshold can use.

Present invention also offers a kind of fingerprint template input device based on smart card, including:First acquisition module, processing Module and template memory module;Wherein,

First acquisition module, for when the finger for judging user is difficult finger, obtaining the finger of the second preset value time Line characteristic;Wherein, the second preset value and the first preset value sum are N;

Processing module, for the fingerprint characteristic data for obtaining every time, calculate respectively and other times in addition to this time The ratio of the matching logarithm of the fingerprint characteristic data of acquisition;Store the ratio for each matching logarithm being calculated and enter according to size Row sequence, update the mark number of first K times fingerprint characteristic data from big to small;Wherein, K<N;

Template memory module, for being ranked up to mark number according to size, select from big to small preceding first pre- If fingerprint characteristic data is stored in smart card as effective fingerprint template corresponding to the mark number of value.

Further, the device also includes:Second acquisition module and judge module;

Second acquisition module, for obtaining the fingerprint characteristic data of the first preset value time;

Judge module, for the fingerprint characteristic data of the first preset value time according to acquisition, judge user finger whether For difficult finger.

Further, the device also includes:Setup module, for obtain the second preset value time fingerprint characteristic data it Before, set each fingerprint characteristic data marks number and each fingerprint characteristic data and the other fingerprint characteristics obtained The one-to-one relationship of the ratio of the matching logarithm of data;Wherein, the initial value of the mark number of each fingerprint characteristic data For 0.

Further, processing module, it is additionally operable to:The matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively Value;

Whether the matching threshold for judging to calculate can use;

When matching threshold can use, matching threshold is arranged to of effectively fingerprint template corresponding with fingerprint characteristic data With logarithmic threshold;Otherwise, the matching logarithmic threshold of effectively fingerprint template corresponding with fingerprint characteristic data is arranged to initial With threshold value.

Further, processing module, it is specifically used for:

The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of the first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;

According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of the first preset value time The matching threshold of secondary fingerprint characteristic data.

Further, processing module also particularly useful for:

Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of the first preset value calculated Whether initial matching threshold value is less than;

When the matching threshold calculated is less than initial matching threshold value, the fingerprint of the 3rd preset value in fingerprint database is obtained Characteristic;

By the fingerprint characteristic data of the 3rd preset value in the fingerprint database of acquisition one by one with calculating the matching threshold obtained Corresponding effectively fingerprint template carries out matching and obtains matching fraction;

When each matching fraction of acquisition is respectively less than matching threshold, then judge that matching threshold can use.

Technical solution of the present invention includes:When the finger for judging user is difficult finger, the second preset value time is obtained Fingerprint characteristic data;Wherein, the second preset value and the first preset value sum are N;For the fingerprint characteristic data obtained every time, divide Ji Suan not be with the ratio for matching logarithm of the other fingerprint characteristic datas obtained in addition to this time;Storage is calculated each Match the ratio of logarithm and be ranked up according to size, update the mark number of first K times fingerprint characteristic data from big to small; Wherein, K<N;Mark number is ranked up according to size, selects the mark number of preceding first preset value from big to small Corresponding fingerprint characteristic data is stored in smart card as effective fingerprint template.Technical solution of the present invention improves fingerprint recognition Rate.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart of the fingerprint template input method of the invention based on smart card;

Fig. 2 is the structural representation of the fingerprint template input device of the invention based on smart card.

Embodiment

For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application Feature can mutually be combined.

Fig. 1 is the flow chart of the fingerprint template input method of the invention based on smart card, as shown in figure 1, including following step Suddenly:

Step 101:When the finger for judging user is difficult finger, the fingerprint characteristic number of the second preset value time is obtained According to;Wherein, the second preset value and the first preset value sum are N.

Wherein, N here is total time (group) number for the fingerprint characteristic data that collection obtains, general value be more than or equal to 5 and less than or equal to 10 positive integer.First preset value is less than N value, can take 2 or 3.

Further, also include before this step:Obtain the fingerprint characteristic data of the first preset value time;

According to the fingerprint characteristic data of the first preset value of acquisition time, whether the finger for judging the user is difficult hand Refer to.Specifically include:For the fingerprint characteristic data of the first preset value time of acquisition, per fingerprint characteristic data twice is calculated Ratio with logarithm, if the ratio for having a matching logarithm in the ratio for the matching logarithm that calculating obtains is less than initial matching threshold Value, then the finger for judging the user is difficult finger.

Wherein it is possible to using existing fingerprint matching algorithm, such as Point Pattern Matching algorithm, to calculate each secondary fingerprint characteristic number The ratio of matching logarithm between.

For example, 3 fingerprint characteristic datas of collection, the ratio for carrying out matching logarithm two-by-two calculate in advance, of acquisition Ratio with logarithm is respectively 30%, 50% and 80%, and now initial matching threshold value is arranged to 80%, then judges the hand of the user Refer to as difficult finger.

It should be noted that acquisition here includes collection finger print data and processing two processes of finger print data.Wherein such as What is handled the finger print data of collection belongs to usual skill well-known to those skilled in the art to obtain fingerprint characteristic data Art means, will not be repeated here.

Further, before the fingerprint characteristic data of the second preset value time is obtained, in addition to:

The mark number and each fingerprint characteristic data and the other fingers obtained of each fingerprint characteristic data are set The one-to-one relationship of the ratio of the matching logarithm of line characteristic;Wherein, the mark number of each fingerprint characteristic data Initial value is 0.

Step 102:For the fingerprint characteristic data obtained every time, calculate what is obtained with other times in addition to this time respectively The ratio of the matching logarithm of fingerprint characteristic data;Store the ratio for each matching logarithm being calculated and arranged according to size Sequence, update the mark number of first K times fingerprint characteristic data from big to small;Wherein, K<N.

Wherein, K is less than N positive integer, such as can be N 1/3rd halfs either others Fractional value.And K is greater than the first preset value.And

Renewal includes:Incremental processing.

For example, N values, which are 10, K, takes 6.Group in this example is that is, secondary in above-mentioned steps.Including following step Suddenly:

Step a, if there are 10 groups of fingerprint characteristic data M1,M2,...,M10, for certain group fingerprint characteristic data Mi(i=1, 2 ..., 10), calculate in 10 groups of fingerprint characteristic datas and remove MiOutside 9 groups of fingerprint characteristic datas and MiMatching logarithm ratio, The ratio of be calculated 9 matching logarithms is sorted, sequentially selects preceding the 6 big ratios for matching logarithms, record this preceding 6 The ratio of big matching logarithm and corresponding secondary with 6 groups of fingerprint characteristic datas corresponding to ratio of the preceding 6 big matching logarithm Number numbering, and the mark number of 6 groups of fingerprint characteristic datas corresponding to the ratio of the preceding 6 big matching logarithm is incremented by Processing.

Step b, to removing M in 10 groups of fingerprint characteristic datasiOutside other groups of fingerprint characteristic datas, repeat step a, Untill 10 groups of fingerprint characteristic datas of traversal are complete.

Step 103:Mark number is ranked up according to size, selects the mark of preceding first preset value from big to small Remember that fingerprint characteristic data is stored in smart card as effective fingerprint template corresponding to number.

Further, this method also includes:The matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively;

Whether the matching threshold for judging to calculate can use;

When matching threshold can use, matching threshold is arranged to effectively fingerprint template corresponding with the fingerprint characteristic data Match logarithmic threshold;Otherwise, the matching logarithmic threshold of effectively fingerprint template corresponding with the fingerprint characteristic data is arranged to just Beginning matching threshold.

Wherein, the matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively, including:

The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of the first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;

According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of the first preset value time The matching threshold of secondary fingerprint characteristic data.Specifically include:For each in the fingerprint characteristic data of the first preset value time Fingerprint characteristic data, obtain the ratio and mark number of each matching logarithm of this fingerprint characteristic data stored;To obtaining Each matching logarithm ratio be added after divided by this fingerprint characteristic data mark number, be this fingerprint characteristic number According to matching threshold.

And

Whether the matching threshold for judging to calculate can use, including:

Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of the first preset value for calculating acquisition Whether value is less than initial matching threshold value;

When the matching threshold calculated is less than initial matching threshold value, the finger of the 3rd preset value time in fingerprint database is obtained Line characteristic;

By the fingerprint characteristic data of the 3rd preset value in the fingerprint database of acquisition one by one with calculating the matching threshold obtained Corresponding effectively fingerprint template carries out matching and obtains matching fraction;

When each matching fraction of acquisition is respectively less than matching threshold, then judge that matching threshold can use.

Wherein, the 3rd preset value can be chosen according to actual conditions, at least will be from fingerprint base in order to reduce misclassification rate It is middle to call 1000 groups of fingerprint characteristic datas to be matched, to prove that above-mentioned matching threshold will not cause obvious knowledge by mistake.Specifically Choose that how many group belong to conventional techniques well-known to those skilled in the art, are not intended to limit the present invention, herein no longer Repeat.

For example, when N values are 10, if the first preset value is 3, fingerprint corresponding to 3 big mark numbers before selection Characteristic (is assumed to be M1,M6,M9) it is effective template, it is stored in smart card.M is calculated respectively1,M6,M9Matching threshold.Specifically Including:M is obtained respectively1,M6,M9Mark number and it is per treatment mark number when M1,M6,M9Matching logarithm ratio; With the M of record1Each matching logarithm ratio sum divided by M1Mark number, that is, obtain M1Matching threshold, with record M6Each matching logarithm ratio sum divided by M6Mark number, that is, obtain M6Matching threshold, with the M of record9It is each Match the ratio sum divided by M of logarithm9Mark number, that is, obtain M9Matching threshold.

In the present invention, by obtaining N group fingerprint characteristic datas, and every group of fingerprint characteristic data of matching primitives is carried out two-by-two Match the ratio of logarithm and the mark number of every group of fingerprint characteristic data is handled, lock in N group fingerprint characteristic datas Several groups of ratio highest (the first preset value) fingerprint characteristic data for matching logarithm with other groups of fingerprint characteristic datas is effective Fingerprint template, so as to improve the quality of fingerprint template, finally improve fingerprint recognition rate.

Fig. 2 is the structural representation of the fingerprint template input device of the invention based on smart card, as shown in Fig. 2 including:The One acquisition module, processing module and template memory module.Wherein,

First acquisition module, for when the finger for judging user is difficult finger, obtaining the finger of the second preset value time Line characteristic.Wherein, the second preset value and the first preset value sum are N.

Processing module, for the fingerprint characteristic data for obtaining every time, calculate respectively and other times in addition to this time The ratio of the matching logarithm of the fingerprint characteristic data of acquisition;Store the ratio for each matching logarithm being calculated and enter according to size Row sequence, update the mark number of first K times fingerprint characteristic data from big to small;Wherein, K<N.

Template memory module, for being ranked up to mark number according to size, select from big to small preceding first pre- If fingerprint characteristic data is stored in smart card as effective fingerprint template corresponding to the mark number of value.

Further, processing module, it is additionally operable to:The matching threshold of the fingerprint characteristic data of the first preset value time is calculated respectively Value;

Whether the matching threshold for judging to calculate can use;

When matching threshold can use, matching threshold is arranged to of effectively fingerprint template corresponding with fingerprint characteristic data With logarithmic threshold;Otherwise, the matching logarithmic threshold of effectively fingerprint template corresponding with fingerprint characteristic data is arranged to initial With threshold value.

Wherein, processing module, it is specifically used for:

The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of the first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;

According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of the first preset value time The matching threshold of secondary fingerprint characteristic data.

And processing module also particularly useful for:

Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of the first preset value calculated Whether initial matching threshold value is less than;

When the matching threshold calculated is less than initial matching threshold value, the fingerprint of the 3rd preset value in fingerprint database is obtained Characteristic;

By the fingerprint characteristic data of the 3rd preset value in the fingerprint database of acquisition one by one with calculating the matching threshold obtained Corresponding effectively fingerprint template carries out matching and obtains matching fraction;

When each matching fraction of acquisition is respectively less than matching threshold, then judge that matching threshold can use.

Further, the fingerprint template input device also includes:Second acquisition module and judge module;

Second acquisition module, for obtaining the fingerprint characteristic data of the first preset value time;

Judge module, for the fingerprint characteristic data of the first preset value time according to acquisition, judge user finger whether For difficult finger.And

The fingerprint template input device also includes:Setup module, for obtaining the fingerprint characteristic number of the second preset value time According to the mark number and each fingerprint characteristic data for before, setting each fingerprint characteristic data and the other fingerprints obtained The one-to-one relationship of the ratio of the matching logarithm of characteristic;Wherein, the mark number of the fingerprint characteristic data obtained every time Initial value be 0.

One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module Formula is realized.The application is not restricted to the combination of the hardware and software of any particular form.

Although disclosed herein embodiment as above, described content be only readily appreciate the present invention and use Embodiment, it is not limited to the present invention.Technical staff in any art of the present invention, taken off not departing from the present invention On the premise of the spirit and scope of dew, any modification and change, but the present invention can be carried out in the form and details of implementation Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.

Claims (10)

  1. A kind of 1. fingerprint template input method based on smart card, it is characterised in that including:
    Obtain the fingerprint characteristic data of the first preset value time;For the fingerprint characteristic data of the first preset value time of acquisition, calculate The ratio of matching logarithm per fingerprint characteristic data twice, if there is a matching pair in the ratio for the matching logarithm that calculating obtains Several ratios is less than initial matching threshold value, then the finger for judging user is difficult finger;
    When the finger for judging user is difficult finger, the fingerprint characteristic data of the second preset value time is obtained;Wherein, second is pre- If value and the first preset value sum are N;
    For the fingerprint characteristic data obtained every time, calculate respectively and the other fingerprint characteristic datas obtained in addition to this time Matching logarithm ratio;The ratio of each matching logarithm being calculated is stored simultaneously to be ranked up according to size, update from greatly to The mark number of small first K times fingerprint characteristic data;Wherein, K<N;
    Mark number is ranked up according to size, corresponding to the mark number for selecting preceding first preset value from big to small Fingerprint characteristic data is stored in smart card as effective fingerprint template.
  2. 2. fingerprint template input method according to claim 1, it is characterised in that in the acquisition the second preset value time Before fingerprint characteristic data, this method also includes:
    Mark number and each fingerprint characteristic data and the other fingerprints spies obtained of each fingerprint characteristic data are set Levy the one-to-one relationship of the ratio of the matching logarithm of data;Wherein, the mark number of each fingerprint characteristic data is initial It is worth for 0.
  3. 3. fingerprint template input method according to claim 1, it is characterised in that this method also includes:
    The matching threshold of the fingerprint characteristic data of first preset value time is calculated respectively;
    Whether the matching threshold for judging to calculate can use;
    When the matching threshold is available, the matching threshold is arranged to the fingerprint characteristic data with first preset value time The matching logarithmic threshold of corresponding effectively fingerprint template;Otherwise, will be corresponding with the fingerprint characteristic data of first preset value time The matching logarithmic threshold of effective fingerprint template be arranged to initial matching threshold value.
  4. 4. fingerprint template input method according to claim 3, it is characterised in that described to calculate described first respectively default The matching threshold of the fingerprint characteristic data of value time, including:
    The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;
    According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of first preset value time The matching threshold of secondary fingerprint characteristic data.
  5. 5. fingerprint template input method according to claim 4, it is characterised in that the matching threshold for judging to calculate Whether can use, including:
    Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of first preset value calculated Whether the initial matching threshold value is less than;
    When the matching threshold calculated is less than the initial matching threshold value, the finger of the 3rd preset value time in fingerprint database is obtained Line characteristic;
    The fingerprint characteristic data of 3rd preset value in the fingerprint database of acquisition time is corresponding with the matching threshold calculated one by one Effective fingerprint template carry out matching obtain matching fraction;When each matching fraction of acquisition is respectively less than the matching calculated Threshold value, the then matching threshold calculated described in judgement can use.
  6. A kind of 6. fingerprint template input device based on smart card, it is characterised in that including:Second acquisition module, judge module, First acquisition module, processing module and template memory module;Wherein,
    Second acquisition module, for obtaining the fingerprint characteristic data of the first preset value time;
    Judge module, for the fingerprint characteristic data of the first preset value time for acquisition, calculate per fingerprint characteristic number twice According to matching logarithm ratio, if having the ratio of a matching logarithm less than initial in calculating the ratio of the matching logarithm obtained With threshold value, then the finger for judging user is difficult finger;
    First acquisition module, the fingerprint for when the finger for judging user is difficult finger, obtaining the second preset value time are special Levy data;Wherein, the second preset value and the first preset value sum are N;
    Processing module, for the fingerprint characteristic data for obtaining every time, calculate obtained with other times in addition to this time respectively Fingerprint characteristic data matching logarithm ratio;Store the ratio for each matching logarithm being calculated and arranged according to size Sequence, update the mark number of first K times fingerprint characteristic data from big to small;Wherein, K<N;
    Template memory module, for being ranked up to mark number according to size, select preceding first preset value from big to small Fingerprint characteristic data corresponding to individual mark number is stored in smart card as effective fingerprint template.
  7. 7. fingerprint template input device according to claim 6, it is characterised in that the device also includes:Setup module, use In the mark number for before the fingerprint characteristic data for obtaining the second preset value time, setting each fingerprint characteristic data and every time Fingerprint characteristic data and other time fingerprint characteristic data obtained matching logarithm ratio one-to-one relationship;Wherein, The initial value of the mark number of each fingerprint characteristic data is 0.
  8. 8. fingerprint template input device according to claim 6, it is characterised in that the processing module, be additionally operable to:
    The matching threshold of the fingerprint characteristic data of first preset value time is calculated respectively;
    Whether the matching threshold for judging to calculate can use;
    When the matching threshold is available, the matching threshold is arranged to the fingerprint characteristic data with first preset value time The matching logarithmic threshold of corresponding effectively fingerprint template;Otherwise, will be corresponding with the fingerprint characteristic data of first preset value time The matching logarithmic threshold of effective fingerprint template be arranged to initial matching threshold value.
  9. 9. fingerprint template input device according to claim 8, it is characterised in that the processing module, be specifically used for:
    The ratio of the matching logarithm of fingerprint characteristic data each in the fingerprint characteristic data of first preset value time is obtained respectively The mark number of example and this fingerprint characteristic data;
    According to the ratio and mark number of the matching logarithm of acquisition, calculate every in the fingerprint characteristic data of first preset value time The matching threshold of secondary fingerprint characteristic data.
  10. 10. fingerprint template input device according to claim 9, it is characterised in that the processing module also particularly useful for:
    Judge the matching threshold of fingerprint characteristic data each in the secondary fingerprint characteristic data of first preset value calculated Whether the initial matching threshold value is less than;
    When the matching threshold calculated is less than the initial matching threshold value, the finger of the 3rd preset value time in fingerprint database is obtained Line characteristic;
    The fingerprint characteristic data of 3rd preset value in the fingerprint database of acquisition time is corresponding with the matching threshold calculated one by one Effective fingerprint template carry out matching obtain matching fraction;
    When each matching fraction of acquisition is respectively less than the matching threshold calculated, the then matching threshold calculated described in judgement It can use.
CN201410821062.9A 2014-12-24 2014-12-24 A kind of fingerprint template input method and device based on smart card CN104463141B (en)

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