JP3489091B2 - Fingerprint collation processing method and fingerprint collation device - Google Patents
Fingerprint collation processing method and fingerprint collation deviceInfo
- Publication number
- JP3489091B2 JP3489091B2 JP25805397A JP25805397A JP3489091B2 JP 3489091 B2 JP3489091 B2 JP 3489091B2 JP 25805397 A JP25805397 A JP 25805397A JP 25805397 A JP25805397 A JP 25805397A JP 3489091 B2 JP3489091 B2 JP 3489091B2
- Authority
- JP
- Japan
- Prior art keywords
- fingerprint
- average
- collation
- matching
- level
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Collating Specific Patterns (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、指紋照合により本
人確認を行う指紋照合処理方法及び指紋照合装置に関す
る。指紋と識別番号（ＩＤ番号）とを予め登録ファイル
に登録しておき、指紋照合時に、入力したＩＤ番号を基
に登録指紋を読出し、押捺指紋を撮像した撮像指紋と登
録指紋とを照合し、照合一致により本人確認を行って、
ドアの解錠や装置の操作を可能とするものであり、指紋
状態等に対応して柔軟性のある指紋照合が要望されてい
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fingerprint collation processing method and a fingerprint collation device for performing personal identification by fingerprint collation. A fingerprint and an identification number (ID number) are registered in a registration file in advance, and at the time of fingerprint matching, the registered fingerprint is read based on the input ID number, and the imaged fingerprint of the imprinted fingerprint and the registered fingerprint are matched, The identity is confirmed by matching and matching,
The door can be unlocked and the device can be operated, and there is a demand for flexible fingerprint matching corresponding to the fingerprint state.
【０００２】[0002]
【従来の技術】従来の指紋照合装置に対して指紋を登録
する場合、例えば、図６のフローチャートに従って行う
ものである。即ち、指紋押捺か否かを判定し（Ｅ１）、
指紋押捺の場合は、押捺した指紋をカメラで撮像し、そ
のカメラからの多値画像信号を取込み（Ｅ２）、その多
値画像信号を二値化し（Ｅ３）、二値指紋画像について
の端点や分岐点等の特徴点抽出等により登録処理を行い
（Ｅ４）、その登録処理により所定数の特徴点が抽出で
きたか否かにより登録合格か否かを判定し（Ｅ５）、所
定数の特徴点を抽出できた時は登録合格として登録ファ
イルに辞書データとして登録し（Ｅ６）、所定数の特徴
点を抽出できない時は登録不合格として、登録失敗処理
を行う（Ｅ７）。登録失敗処理としては、例えば、指紋
登録操作のやり直し等がある。2. Description of the Related Art When a fingerprint is registered in a conventional fingerprint collation device, for example, it is performed according to the flowchart of FIG. That is, it is determined whether or not the fingerprint is imprinted (E1),
In the case of fingerprint imprinting, the imprinted fingerprint is imaged by a camera, the multi-valued image signal from the camera is captured (E2), the multi-valued image signal is binarized (E3), and the end point of the binary fingerprint image or Registration processing is performed by extracting feature points such as branch points (E4), and it is determined whether registration has been successful by extracting a predetermined number of feature points by the registration processing (E5), and a predetermined number of feature points. Is extracted, it is registered as dictionary data in the registration file as a registration pass (E6), and if a predetermined number of feature points cannot be extracted, registration is rejected and a registration failure process is performed (E7). The registration failure process includes, for example, redoing the fingerprint registration operation.
【０００３】又撮像指紋と登録指紋との照合は、例え
ば、図７のフローチャートに従って行うものである。即
ち、指紋押捺か否かを判定し（Ｆ１）、指紋押捺の場合
は、押捺した指紋をカメラで撮像し、そのカメラからの
多値画像信号を取込み（Ｆ２）、その多値画像信号を二
値化し（Ｆ３）、照合処理を行い（Ｆ４）、照合合格か
否かを判定し（Ｆ５）、登録指紋の特徴点と撮像指紋の
特徴点との照合一致数が所定数以上の場合は、照合合格
として本人確認を行い（Ｆ６）、登録指紋の特徴点と撮
像指紋の特徴点との照合一致数が所定数以上でない場合
は、照合不合格として照合失敗処理を行う（Ｆ７）。こ
の照合失敗処理としては、例えば、指紋照合の為の指紋
押捺のやり直し等がある。The collation between the imaged fingerprint and the registered fingerprint is performed, for example, according to the flowchart of FIG. That is, it is determined whether or not the fingerprint is imprinted (F1). In the case of fingerprint imprinting, the imprinted fingerprint is imaged by a camera, the multi-valued image signal from the camera is captured (F2), and the multi-valued image signal is captured. If the number of matching matches between the feature point of the registered fingerprint and the feature point of the imaged fingerprint is equal to or more than a predetermined number, the value is converted (F3), the matching process is performed (F4), it is determined whether or not the matching is successful (F5). If the verification is successful, the person is verified (F6), and if the number of matching matches between the feature points of the registered fingerprint and the imaged fingerprint is not more than a predetermined number, the verification failure process is performed (F7). This collation failure processing includes, for example, reprinting of fingerprint imprinting for fingerprint collation.
【０００４】[0004]
【発明が解決しようとする課題】指紋は個人特有のパタ
ーンを有するものであり、従って、この指紋を登録して
おくことにより、この登録指紋と押捺指紋とを照合して
本人確認を行うことができる。しかし、高齢者や手作業
を頻繁に行う者の指紋は、皮膚の荒れがひどくなって、
撮像指紋が不鮮明となり、指紋照合の為の特徴点の抽出
が困難となり、指紋登録失敗或いは指紋登録後の撮像指
紋の不鮮明による指紋照合失敗が頻発する問題がある。A fingerprint has a pattern unique to an individual. Therefore, by registering this fingerprint, it is possible to verify the identity by collating the registered fingerprint with the imprinted fingerprint. it can. However, the fingerprints of the elderly and those who perform frequent manual work may cause rough skin and
There is a problem that the imaged fingerprint becomes unclear, it becomes difficult to extract the feature points for fingerprint collation, and the fingerprint registration fails or the fingerprint collation fails due to the unclear imaged fingerprint after fingerprint registration.
【０００５】そこで、指紋照合に於ける照合レベルを低
く設定して、指紋照合率を高くすることが考えられる。
しかし、指紋照合はセキュリティの向上を図るものであ
り、この指紋照合に於ける照合レベルを全般的に低下さ
せることは、セキュリティの低下となる問題がある。本
発明は、撮像指紋の状態に対応して照合レベルを自動的
に設定し、セキュリティを低下させることなく、照合率
を向上させることを目的とする。Therefore, it is conceivable to set the collation level in the fingerprint collation to be low to increase the fingerprint collation rate.
However, fingerprint collation aims to improve security, and lowering the collation level in this fingerprint collation generally causes a problem of lowering security. It is an object of the present invention to automatically set a matching level corresponding to the state of a picked-up fingerprint, and improve the matching rate without lowering security.
【０００６】[0006]
【課題を解決するための手段】本発明の指紋照合処理方
法は、（１）押捺指紋を撮像した撮像指紋と登録指紋と
を照合し、照合不一致の時は再度指紋押捺を行う指紋照
合処理方法であって、照合一致までの押捺回数の平均値
の平均押捺回数と、撮像指紋の状態を示す抽出した特徴
点の数等による状態指数の平均値の平均状態指数とを基
に照合レベルを設定し、この照合レベルに従って撮像指
紋と登録指紋とを照合する過程を含むものであり、撮像
指紋の状態に対応して照合レベルを設定することができ
るから、全体としてのセキュリティを維持して指紋照合
率の向上を図ることができる。The fingerprint collation processing method of the present invention is (1) a fingerprint collation processing method of collating an imaged fingerprint of an imprinted fingerprint with a registered fingerprint and performing fingerprint imprinting again when the collation does not match. Therefore, the matching level is set based on the average number of impressions of the average number of impressions up to matching match and the average state index of the average value of the state index by the number of extracted feature points indicating the state of the imaged fingerprint. However, it includes the process of matching the imaged fingerprint with the registered fingerprint according to this matching level, and since the matching level can be set according to the state of the imaged fingerprint, the fingerprint matching is performed while maintaining the security as a whole. The rate can be improved.
【０００７】又（２）照合一致までの押捺回数の平均値
の平均押捺回数を１回を含む第１の範囲と、この第１の
範囲より多い平均押捺回数の第２の範囲と、この第２の
範囲より多い平均押捺回数の第３の範囲とを設定し、平
均押捺回数が第１の範囲内で且つ平均状態指数より今回
の状態指数が上昇している時に、即ち、撮像指紋が良好
な時に照合レベルを上昇し、平均押捺回数が第２の範囲
を超えた第３の範囲内で且つ平均状態指数より今回の状
態指数が低下している時に、即ち、撮像指紋が良好でな
い時に照合レベルを低下させ、それ以外の状態の時に照
合レベルを前の状態に維持させる過程を含むもので、平
均押捺回数と平均状態指数とに対応して自動的に照合レ
ベルを設定することができる。(2) A first range including an average number of times of impressing of the number of times of impressing until collation coincidence, a second range of an average number of times of impressing which is larger than the first range, and a second range The third range of the average number of impressions is set to be larger than the range of 2, and when the average number of impressions is within the first range and the current state index is higher than the average state index, that is, the imaged fingerprint is good. The verification level is increased at any time, and the verification is performed when the average number of impressions is within the third range that exceeds the second range and the current state index is lower than the average state index, that is, when the imaged fingerprint is not good. This includes a process of lowering the level and maintaining the collation level in the previous state in other states, and the collation level can be automatically set in correspondence with the average number of times of impressing and the average state index.
【０００８】又（３）撮像指紋の状態指数を求めて、こ
の状態指数又はこの状態指数に基づいて設定される照合
レベルを表示する過程を含むもので、撮像指紋から抽出
した特徴点等による状態指数やそれによる照合レベルを
表示し、その表示内容にによって、指紋状態の劣化の進
行状態の認識や登録或いは照合の指の変更等を行うこと
ができる。(3) It includes a process of obtaining the state index of the imaged fingerprint and displaying the state index or the matching level set based on this state index, and the state based on the feature points or the like extracted from the imaged fingerprint. The index and the matching level based on the index are displayed, and the progress of deterioration of the fingerprint state can be recognized, registered, or the finger for matching can be changed depending on the displayed content.
【０００９】又本発明の指紋照合装置は、（４）登録指
紋を格納する登録ファイル６と、押捺指紋を撮像した撮
像指紋と前記登録指紋とを照合する指紋照合部５と、各
部を制御する主制御部７とを有する指紋照合装置であっ
て、主制御部７は、指紋照合部５に於ける撮像指紋と登
録指紋との照合一致が得られるまでの前記押捺面に対す
る押捺回数を計数し、過去の複数回の押捺回数との平均
値の平均押捺回数の算出部１３と、撮像指紋の状態指数
を求めて過去の複数回の状態指数との平均値の平均状態
指数の算出部１４と、平均押捺回数と平均状態指数とに
基づいて指紋照合部５に於ける撮像指紋と登録指紋との
照合レベルを設定する照合レベル設定部１５とを有する
ものである。The fingerprint collation device of the present invention controls (4) a registration file 6 for storing a registered fingerprint, a fingerprint collation unit 5 for collating an imaged fingerprint of an imprinted fingerprint with the registered fingerprint, and each unit. A fingerprint collation apparatus having a main control unit (7), wherein the main control unit (7) counts the number of times of imprinting on the imprint surface until collation of the imaged fingerprint and the registered fingerprint in the fingerprint collation unit (5) is obtained. A calculation unit 13 for calculating an average number of times of pressing of an average value with respect to a plurality of past pressing times, and a calculation unit 14 for calculating an average index of an imaged fingerprint and an average value of an average value with a plurality of past status indexes. The fingerprint collation unit 5 has a collation level setting unit 15 that sets the collation level between the imaged fingerprint and the registered fingerprint in the fingerprint collation unit 5 based on the average number of times of imprinting and the average state index.
【００１０】又（５）主制御部７は、撮像指紋の状態指
数を求めて、この状態指数又は該状態指数に基づいて設
定される照合レベルを表示部１０に表示する手段を備
え、指紋照合者に対して現在の指紋状態を認識させる。(5) The main control unit 7 is provided with means for obtaining the state index of the picked-up fingerprint and displaying the state index or the collation level set on the basis of the state index on the display unit 10 for fingerprint collation. Makes the person recognize the current fingerprint state.
【００１１】[0011]
【発明の実施の形態】図１は本発明の実施の形態の指紋
照合装置の要部説明図であり、１は押捺面、２はカメ
ラ、３は画像処理部、４は特徴点抽出部、５は指紋照合
部、６は登録ファイル、７は主制御部、８はテンキー、
９は入力処理部、１０は表示部、１１は表示制御部、１
２は制御出力部、１３は平均押捺回数算出部、１４は平
均状態指数算出部、１５は照合レベル設定部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a main part of a fingerprint collating apparatus according to an embodiment of the present invention, in which 1 is a printing surface, 2 is a camera, 3 is an image processing section, 4 is a feature point extracting section, 5 is a fingerprint collation unit, 6 is a registration file, 7 is a main control unit, 8 is a numeric keypad,
9 is an input processing unit, 10 is a display unit, 11 is a display control unit, 1
Reference numeral 2 is a control output unit, 13 is an average pressing count calculation unit, 14 is an average state index calculation unit, and 15 is a matching level setting unit.
【００１２】押捺面１は、図示を省略した白熱ランプや
発光ダイオード等の光源によって下方から照明し、上面
に指紋押捺を行うもので、押捺指紋を下方に配置したＣ
ＣＤカメラ等のカメラ２により撮像する。このカメラ２
からの撮像信号は画像処理部３に入力され、２値化処理
等の処理を施し、特徴点抽出部４に於いて端点や分岐点
等の指紋の特徴点を抽出し、指紋照合時は指紋照合部５
に入力し、指紋登録時は主制御部７の制御に従って登録
ファイル６に登録する。The imprint surface 1 is illuminated from below by a light source such as an incandescent lamp or a light emitting diode (not shown) to imprint a fingerprint on the upper surface. The imprint fingerprint is placed below C.
The image is taken by the camera 2 such as a CD camera. This camera 2
The image pickup signal from is input to the image processing unit 3, subjected to processing such as binarization, and the feature point extraction unit 4 extracts the characteristic points of the fingerprint such as the end points and the branch points. Collation unit 5
When the fingerprint is registered, it is registered in the registration file 6 under the control of the main control unit 7.
【００１３】又テンキー８からＩＤ番号やパスワード或
いは指紋登録要求，指紋照合要求，指紋状態表示要求等
を入力するものである。しかし、指紋登録時は特定の鍵
等を必要とする場合が一般的であり、又指紋照合要求を
特に入力することなく、ＩＤ番号入力後に指紋押捺を行
う場合が一般的である。又主制御部７は、指紋照合時、
入力処理部９を介して入力されたＩＤ番号を基に登録フ
ァイル６から登録指紋を読出して指紋照合部５に入力す
る制御を行う。An ID number, a password, a fingerprint registration request, a fingerprint collation request, a fingerprint status display request, etc. are input from the ten-key pad 8. However, it is common to require a specific key or the like when registering a fingerprint, and it is common to perform fingerprint imprinting after inputting an ID number without particularly inputting a fingerprint collation request. Further, the main control unit 7 is
Based on the ID number input through the input processing unit 9, the registered fingerprint is read from the registration file 6 and input to the fingerprint collation unit 5.
【００１４】この登録ファイル６には、押捺指紋の端
点，分岐点等の特徴点を抽出し、その特徴点の位置情報
と共に登録指紋とし、又検索を容易にする為にＩＤ番号
を付加して登録する構成が一般的である。本発明に於い
ては、平均押捺回数算出部１３により算出された平均押
捺回数と平均状態指数算出部１４により算出された平均
状態指数を含めて、登録指紋と共に、或いは、ＩＤ番号
対応に登録することができる。又指紋登録時の状態指数
を登録することもできる。Characteristic points such as end points and branch points of the imprinted fingerprint are extracted from the registration file 6 and used as registered fingerprints together with the position information of the characteristic points, and an ID number is added to facilitate retrieval. The configuration is generally registered. In the present invention, the average number of impressions calculated by the average number of impressions calculation unit 13 and the average state index calculated by the average state index calculation unit 14 are included together with the registered fingerprint or corresponding to the ID number. be able to. It is also possible to register the state index at the time of fingerprint registration.
【００１５】指紋照合部５は、主制御部７の照合レベル
設定部１５から照合レベルが設定されて、撮像指紋と登
録指紋との照合を行うものであり、例えば、撮像指紋か
ら抽出した特徴点の個数により状態指数を表し、照合レ
ベルは、特徴点の一致個数として設定することができ
る。この状態指数を平均状態指数算出部１４に入力し、
過去の所定回数について平均値を求める。又指紋照合部
５から照合一致信号が入力されるまでの繰り返し指紋を
押捺した回数を計数し、平均押捺回数算出部１３に於い
て過去の所定回数について平均値を求める。照合レベル
設定部１５は、平均押捺回数と平均状態指数とに従った
照合レベルを指紋照合部５に設定するものである。The fingerprint collation unit 5 sets the collation level from the collation level setting unit 15 of the main control unit 7 to collate the imaged fingerprint with the registered fingerprint. For example, the characteristic points extracted from the imaged fingerprint. The state index is represented by the number of points, and the matching level can be set as the number of matching feature points. This state index is input to the average state index calculation unit 14,
An average value is calculated for a predetermined number of times in the past. In addition, the number of times the fingerprint is repeatedly pressed until the collation matching signal is input from the fingerprint collation unit 5 is counted, and the average imprinting number calculation unit 13 obtains an average value for a predetermined number of past times. The collation level setting unit 15 sets the collation level according to the average number of impressions and the average state index in the fingerprint collation unit 5.
【００１６】この指紋照合部５に設定する照合レベルを
高くすると、特徴点の一致個数が多い時に照合一致とな
り、セキュリティを高くすることができる。反対に照合
レベルを低くすると、特徴点の一致個数が少なくても照
合一致となり、指紋状態の悪い場合の照合率を高くする
ことができる。If the collation level set in the fingerprint collation unit 5 is increased, collation coincidence occurs when the number of coincident feature points is large, and security can be enhanced. On the other hand, if the matching level is lowered, matching is achieved even if the number of matching feature points is small, and the matching rate when the fingerprint state is poor can be increased.
【００１７】主制御部７は、指紋照合部５からの照合一
致信号に従って、ドアの開閉制御の場合は、制御出力部
１２からドアの電気錠の解錠信号を送出し、又重要な機
器の操作可能とする場合は、制御出力部１２から操作可
能とする電源投入制御信号等を送出することになる。In the case of controlling the opening and closing of the door, the main control section 7 sends an unlocking signal of the electric lock of the door from the control output section 12 in accordance with the collation coincidence signal from the fingerprint collating section 5, and also in the case of an important device. When it is made operable, the control output unit 12 sends a power-on control signal or the like to make it operable.
【００１８】又表示部１０は液晶表示パネル等により構
成され、主制御部７からのデータに基づいて表示制御部
１１によって表示内容が制御される。例えば、テンキー
９の操作による入力情報や押捺面１に対する指紋押捺状
態の押圧力の良否或いは照合結果を表示部１０に表示す
ることができる。この場合の指紋押捺に於ける押圧力
は、例えば、画像処理部３に於いて特徴点抽出部４に於
ける特徴点抽出に適した画像信号が得られるか否か、或
いは画像の平均輝度等を基に判定することができるか
ら、押圧力の最適値が得られるような表示形式とするこ
とができる。又合成音声や複数の音色選択により入力操
作の指示や適正な入力か否かの表示及び照合結果の良否
を表示することもできる。The display unit 10 is composed of a liquid crystal display panel or the like, and the display content is controlled by the display control unit 11 based on the data from the main control unit 7. For example, it is possible to display the input information by the operation of the ten-key pad 9, the quality of the pressing force of the fingerprint pressing state on the pressing surface 1, or the verification result on the display unit 10. In this case, the pressing force applied by the fingerprint printing is, for example, whether or not an image signal suitable for the feature point extraction in the feature point extraction unit 4 in the image processing unit 3 is obtained, the average brightness of the image, or the like. Since the determination can be made based on, the display format can be such that the optimum value of the pressing force can be obtained. It is also possible to display an instruction of an input operation, display of whether or not an appropriate input is made, and whether the matching result is good or bad by selecting a synthetic voice or a plurality of tones.
【００１９】又指紋状態表示要求時には、主制御部７
は、前述の撮像指紋の状態指数或いは照合レベルを表示
部１０に表示するように制御する。それによって、指紋
照合者は、自己の指紋状態を認識し、例えば、５指の中
の状態指数の良い指を用いて指紋照合を行うことができ
る。又画像処理部３，特徴点抽出部４，指紋照合部５，
主制御部７，入力処理部９，表示制御部１１等を含め
て、マイクロプロセッサの処理機能によって各部の機能
を実現することも可能である。When a fingerprint status display request is made, the main controller 7
Controls the display unit 10 to display the above-mentioned state index or collation level of the imaged fingerprint. Thereby, the fingerprint collator can recognize his / her fingerprint state and perform the fingerprint collation by using, for example, the finger having a good state index among the five fingers. Further, the image processing unit 3, the feature point extraction unit 4, the fingerprint collation unit 5,
It is also possible to realize the functions of the respective units including the main control unit 7, the input processing unit 9, the display control unit 11, etc. by the processing functions of the microprocessor.
【００２０】図２は本発明の実施の形態の指紋登録のフ
ローチャートであり、指紋押捺か否かを判定し（Ａ
１）、押捺した場合は、多値画像取り込みを行い（Ａ
２）、二値化及び登録処理を行う（Ａ３）。即ち、図１
の押捺面１に押捺した指紋をカメラ２により撮像し、画
像処理部３に於いてカメラ２からの多値画像を取り込
み、その多値画像を二値化し、特徴点抽出部４により端
点や分岐点等の特徴点を抽出する登録処理を行う。な
お、ステップ（Ａ１）の前にテンキー８からＩＤ番号を
入力する場合が一般的であり、本発明に於いても図示を
省略しているが、ＩＤ番号を入力することができる。FIG. 2 is a flow chart of fingerprint registration according to the embodiment of the present invention, in which it is determined whether fingerprint imprinting is performed (A
1) In case of imprinting, multi-value image capture is performed (A
2), binarization and registration processing is performed (A3). That is, FIG.
The fingerprint imprinted on the imprinting surface 1 is captured by the camera 2, the multi-valued image from the camera 2 is captured by the image processing unit 3, the multi-valued image is binarized, and the feature point extraction unit 4 extracts end points and branches. A registration process for extracting feature points such as points is performed. Note that it is common to input the ID number from the ten-key pad 8 before step (A1), and although not shown in the present invention, the ID number can be input.
【００２１】そして、登録合格か否かを判定し（Ａ
４）、抽出した特徴点の個数が所定値以上の時に登録合
格と判定するもので、所定値に達しない場合は登録失敗
処理を行う（Ａ８）。即ち、再度指紋押捺等を行うこと
になる。又登録合格の場合は、状態指数を取得する（Ａ
５）。即ち、前述のように、特徴点の個数を状態指数と
することができる。或いは、撮像指紋の輝度分布，撮像
指紋の隆線及び谷線と異なる傷等による細線の検出個数
等の各種の撮像指紋の状態を表す指数を用いることがで
きる。Then, it is judged whether or not the registration is successful (A
4) If the number of extracted feature points is equal to or larger than a predetermined value, it is determined that the registration is successful. If the number does not reach the predetermined value, registration failure processing is performed (A8). That is, fingerprint imprinting is performed again. If the registration is successful, the status index is acquired (A
5). That is, as described above, the number of feature points can be used as the state index. Alternatively, it is possible to use an index representing various states of the imaged fingerprint such as the luminance distribution of the imaged fingerprint, the number of thin lines detected due to scratches different from the ridges and valleys of the imaged fingerprint, and the like.
【００２２】主制御部７は、この撮像指紋の状態指数を
基に照合レベルを設定し（Ａ６）、特徴点を含む指紋を
辞書データとして登録ファイル６に登録する（Ａ７）。
この場合に、前述の状態指数及び照合レベルを登録す
る。The main control section 7 sets a collation level based on the state index of the picked-up fingerprint (A6), and registers the fingerprint including the feature points in the registration file 6 as dictionary data (A7).
In this case, the above-mentioned state index and verification level are registered.
【００２３】図３は本発明の実施の形態の指紋照合のフ
ローチャートであり、指紋押捺か否かを判定する（Ｂ
１）。この指紋照合時に於いても、図示を省略している
が、指紋登録時と同様に、テンキー８（図１参照）から
ＩＤ番号を入力して、指紋を押捺する。この指紋押捺に
より、多値画像取り込みを行い（Ｂ２）、二値化及び照
合処理を行う（Ｂ３）。即ち、図１の押捺面１に押捺し
た指紋をカメラ２により撮像し、画像処理部３に於いて
カメラ２からの多値画像を取り込み、その多値画像を二
値化し、特徴点抽出部４により端点や分岐点等の特徴点
を抽出する照合処理を行う。FIG. 3 is a flowchart of fingerprint collation according to the embodiment of the present invention, in which it is determined whether fingerprint imprinting is performed (B
1). Although not shown in the figure, at the time of this fingerprint collation, the fingerprint is imprinted by inputting the ID number from the ten-key pad 8 (see FIG. 1) as in the fingerprint registration. By this fingerprint imprinting, a multi-valued image is captured (B2), and binarization and collation processing are performed (B3). That is, the fingerprint imprinted on the imprint surface 1 of FIG. 1 is captured by the camera 2, the multi-valued image from the camera 2 is captured by the image processing unit 3, the multi-valued image is binarized, and the feature point extraction unit 4 The collation process is performed to extract feature points such as end points and branch points.
【００２４】そして、主制御部７の照合レベル設定部１
５により、指紋照合部５に照合レベルを設定して、登録
指紋と撮像指紋との照合を行い、照合合格（照合一致）
か否かを判定する（Ｂ４）。例えば、登録指紋と撮像指
紋との特徴点の一致個数が照合レベル以下の場合は照合
失敗処理を行う（Ｂ８）。即ち、再度指紋押捺操作或い
はＩＤ番号入力を含めて再入力操作を行う。Then, the collation level setting section 1 of the main control section 7
5, the collation level is set in the fingerprint collation unit 5, the registered fingerprint and the imaged fingerprint are collated, and the collation is passed (collation coincidence).
It is determined whether or not (B4). For example, if the number of matching feature points of the registered fingerprint and the picked-up fingerprint is below the matching level, matching failure processing is performed (B8). That is, the fingerprint input operation or the re-input operation including the input of the ID number is performed again.
【００２５】又登録指紋と撮像指紋との特徴点の一致個
数が照合レベル（照合個数）を超えている場合は、照合
合格（照合一致）とし、その時の撮像指紋の状態指数を
主制御部７の平均状態指数算出部１４に入力し、過去の
Ｎ回にわたる状態指数の平均値を求める（Ｂ５）。又照
合合格（照合一致）となるまでの押捺回数を、画像処理
部３等から主制御部７の平均押捺回数算出部１３に入力
し、過去のＮ回にわたる照合合格までの押捺回数の平均
値を求める（Ｂ６）。そして、平均状態指数と平均押捺
回数とを基に次回の照合レベルを設定する（Ｂ７）。If the number of matching feature points between the registered fingerprint and the imaged fingerprint exceeds the matching level (matching number), the matching is judged as successful (matching matching), and the state index of the imaged fingerprint at that time is determined by the main control unit 7. It is input to the average state index calculation unit 14 of (1) to obtain the average value of the state index over the past N times (B5). Further, the number of times of pushing until the collation is passed (collation coincidence) is input from the image processing unit 3 or the like to the average number of pushing times calculation unit 13 of the main control unit 7, and the average value of the number of pushing times until the past collation is passed over N times. (B6). Then, the next collation level is set based on the average state index and the average number of times of imprinting (B7).
【００２６】図４は本発明の実施の形態の照合レベル設
定のフローチャートであり、図３に於けるステップ（Ｂ
５），（Ｂ６）に対応して平均押捺回数と平均状態指数
とを取得し（Ｃ１）、次に図３に於けるステップ（Ｂ
７）の処理を行う。即ち、平均押捺回数について判定す
る（Ｃ２）。この平均押捺回数は、最小の値は１であ
り、最大は、指紋照合時の押捺繰り返し許容回数とな
る。FIG. 4 is a flow chart of the collation level setting according to the embodiment of the present invention. Step (B) in FIG.
5) and (B6), the average number of times of imprinting and the average state index are acquired (C1), and then step (B) in FIG.
The process of 7) is performed. That is, the average number of times of imprinting is determined (C2). The minimum value of the average number of times of imprinting is 1, and the maximum value is the allowable number of times of imprinting repetition during fingerprint collation.
【００２７】この場合、平均押捺回数が１．００の場合
を第１の範囲、１．００〜１．７５の場合を第２の範
囲、１．７５以上の場合を第３の範囲とし、平均押捺回
数が第１の範囲内の時、即ち、１．００の時、平均状態
指数について判定し（Ｃ３）、撮像指紋の状態が良いこ
とにより、平均状態指数が上昇すると、次回の照合レベ
ル設定としてレベルアップを行う（Ｃ６）。In this case, the case where the average number of times of imprinting is 1.00 is the first range, the case where it is 1.00 to 1.75 is the second range, and the case where it is 1.75 or more is the third range. When the number of impressions is within the first range, that is, 1.00, the average state index is determined (C3), and when the average state index increases due to the good state of the imaged fingerprint, the next collation level setting is performed. The level is raised as (C6).
【００２８】又平均押捺回数が１．７５以上の第３の範
囲の場合、平均状態指数が上昇したか否かを判定し（Ｃ
４）、上昇しない場合或いは低下した場合は、次回の照
合レベル設定としてレベルダウンを行う（Ｃ７）。即
ち、平均押捺回数が多いことは撮像指紋の状態が悪い場
合であり、且つ今回の状態指数も低いものであるから、
照合レベルを低下して、照合率が所定値となるように制
御する。When the average number of times of pushing and pushing is in the third range of 1.75 or more, it is judged whether or not the average state index has risen (C
4) If it does not rise or drops, the level is lowered as the next collation level setting (C7). That is, the fact that the average number of times of imprinting is large means that the state of the imaged fingerprint is bad, and the state index this time is also low.
The collation level is lowered to control the collation rate to a predetermined value.
【００２９】又平均押捺回数が第２の範囲、即ち、１．
００〜１．７５の範囲の場合はレベルを維持し（Ｃ
５）、又平均押捺回数が第１の範囲、即ち、１．００の
場合で、且つ平均状態指数が上昇しない場合は、レベル
を維持する（Ｃ５）。又平均押捺回数が第３の範囲、即
ち、１．７５以上の場合で、且つ平均状態指数が上昇し
た場合は、レベルを維持する（Ｃ５）。The average number of times of imprinting is in the second range, that is, 1.
In the range of 00 to 1.75, the level is maintained (C
5) If the average number of times of imprinting is in the first range, that is, 1.00 and the average state index does not increase, the level is maintained (C5). When the average number of times of imprinting is in the third range, that is, when it is 1.75 or more and the average state index increases, the level is maintained (C5).
【００３０】従って、撮像指紋の状態が非常に良く、平
均押捺回数が１．００で、平均状態指数が上昇する場合
は、照合レベルを高くして、セキュリティの向上を図
り、反対に、撮像指紋の状態が非常に悪く、平均押捺回
数が第２の範囲を超えた第３の範囲の場合で、更に、平
均状態指数が上昇しない場合は、照合レベルを低くし
て、照合率の向上を図ることができる。又照合レベル
は、上限，下限を定めて、その範囲内で更新することが
できる。又維持，アップ，ダウンの条件は、図４に示す
条件以外の他の条件とすることも可能である。例えば、
平均押捺回数が第２の範囲で、且つ平均状態指数が上昇
する場合は、レベルアップとし、照合レベルを上昇する
条件を多くすることも可能である。Therefore, when the state of the imaged fingerprint is very good, the average number of impressions is 1.00, and the average state index rises, the collation level is increased to improve security, and conversely, the imaged fingerprint is reversed. In the case where the state is extremely bad and the average number of times of impressing is in the third range exceeding the second range, and the average state index does not increase further, the collation level is lowered to improve the collation rate. be able to. Further, the collation level can be updated within the range by setting the upper limit and the lower limit. Further, the conditions of maintaining, up, and down may be other conditions than the conditions shown in FIG. For example,
When the average number of times of imprinting is within the second range and the average state index increases, it is possible to increase the level and increase the conditions for increasing the collation level.
【００３１】又前述の第１，第２，第３の範囲は、指紋
照合装置の全体のセキュリティ及びカメラ２や画像処理
部３を含む撮像指紋の解像度等を考慮して設定すること
ができる。又前述の照合レベルの変更制御は、主制御部
７の照合レベル設定部１５から指紋照合部５にＩＤ番号
対応に行うことができる。例えば、照合レベル設定部１
５に、ＩＤ番号対応に次回の照合レベルを前述の平均押
捺回数と平均状態指数とから求めて格納し、指紋照合時
に入力されたＩＤ番号を基に照合レベルを読出して、指
紋照合部５に設定することができる。The above-mentioned first, second and third ranges can be set in consideration of the overall security of the fingerprint collation device and the resolution of the imaged fingerprint including the camera 2 and the image processing section 3. Further, the above-mentioned control of changing the collation level can be performed from the collation level setting unit 15 of the main control unit 7 to the fingerprint collation unit 5 in correspondence with the ID number. For example, the collation level setting unit 1
5, the next collation level corresponding to the ID number is obtained and stored from the average number of times of imprinting and the average state index, the collation level is read out based on the ID number input at the time of fingerprint collation, and the fingerprint collation unit 5 Can be set.
【００３２】図５は本発明の実施の形態の指紋状態判定
表示のフローチャートであり、図１の例えばテンキー８
から指紋状態表示要求及びＩＤ番号を入力し、押捺面１
に指紋押捺を行うものである。その場合、指紋押捺か否
かを判定し（Ｄ１）、押捺した場合は、多値画像取り込
みを行い（Ｄ２）、二値化及び登録処理を行う（Ｄ
３）。即ち、図１の押捺面１に押捺した指紋をカメラ２
により撮像し、画像処理部３に於いてカメラ２からの多
値画像を取り込み、その多値画像を二値化し、特徴点抽
出部４により端点や分岐点等の特徴点を抽出する登録処
理を行う。FIG. 5 is a flow chart of the fingerprint state judgment display according to the embodiment of the present invention.
Enter the fingerprint status display request and ID number from the
The fingerprint is printed on. In that case, it is determined whether or not the fingerprint is imprinted (D1). If the fingerprint is imprinted, the multi-valued image is captured (D2), and the binarization and registration processing is performed (D).
3). That is, the fingerprint imprinted on the imprint surface 1 of FIG.
A registration process is performed in which the multi-valued image from the camera 2 is captured by the image processing unit 3, the multi-valued image is binarized, and the feature point extraction unit 4 extracts feature points such as end points and branch points. To do.
【００３３】そして、登録合格か否かを判定し（Ｄ
４）、抽出した特徴点の個数が所定値以上の時に登録合
格と判定するもので、所定値に達しない場合は登録失敗
として、表示部１０に不合格表示を行う（Ｄ８）。又登
録合格の場合は、図２のステップ（Ａ５）と同様に状態
指数取得を行う（Ｄ５）。例えば、抽出した特徴点の個
数を状態指数とすることができる。或いは、撮像指紋の
輝度分布や他の撮像指紋の状態を表す指数を用いること
ができる。Then, it is judged whether or not the registration is successful (D
4) When the number of extracted feature points is equal to or larger than a predetermined value, it is determined that the registration is successful. If the number does not reach the predetermined value, it is determined that the registration is unsuccessful and a failure display is displayed on the display unit 10 (D8). If the registration is successful, the state index is acquired (D5) as in step (A5) of FIG. For example, the number of extracted feature points can be used as the state index. Alternatively, it is possible to use the brightness distribution of the imaged fingerprint or an index representing the state of another imaged fingerprint.
【００３４】この状態指数を基に照合レベルを判定し
（Ｄ６）、その判定結果を表示部１０に表示する（Ｄ
７）。即ち、指紋照合用として指紋を押捺した時に照合
合格が得られる状態か否か等を表示することができる。
又指紋登録時の状態指数と比較して今回の撮像指紋の状
態の良否を表示することもできる。又今回の指紋状態か
ら判断して、指紋照合には他の指を使用するように注意
を促す表示内容とすることも可能である。或いは、指紋
の再登録を促す表示内容とすることも可能である。この
ような判断処理は、図示を省略したデータベース等を基
に主制御部７に於いて行う構成とすることができる。The collation level is judged based on this state index (D6), and the judgment result is displayed on the display unit 10 (D).
7). That is, it is possible to display, for example, whether or not a verification result is obtained when a fingerprint is imprinted for fingerprint verification.
It is also possible to display the quality of the picked-up fingerprint of this time as compared with the state index at the time of fingerprint registration. In addition, it is possible to use a display content that calls attention to the use of another finger for fingerprint matching, judging from the current fingerprint state. Alternatively, it is also possible to provide a display content that prompts re-registration of the fingerprint. Such a determination process can be performed in the main controller 7 based on a database (not shown).
【００３５】[0035]
【発明の効果】以上説明したように、本発明は、照合一
致までの押捺回数の平均値の平均押捺回数と撮像指紋の
状態を示す状態指数の平均値の平均状態指数とを基に照
合レベルを設定し、この照合レベルによって撮像指紋と
登録指紋との照合を行うものであり、撮像指紋の状態が
劣化した場合は、それに対応して照合レベルを低くする
ことにより、照合率の低下を防止し、又撮像指紋の状態
が良好な場合は、それに対応して照合レベルを高くし
て、セキュリティの向上を図ることができる利点があ
る。又撮像指紋の状態指数を利用して、現在の指紋状態
の良否を表示して、指紋照合に利用可能か否かを認識さ
せることもできる。As described above, according to the present invention, the collation level is based on the average number of times of impressing and the average state index of the state index indicating the state of the imaged fingerprint. The collation between the imaged fingerprint and the registered fingerprint is performed according to this collation level. If the state of the imaged fingerprint deteriorates, the collation level is correspondingly lowered to prevent the collation rate from decreasing. However, when the imaged fingerprint is in a good state, there is an advantage that the collation level can be correspondingly increased to improve the security. It is also possible to display the quality of the current fingerprint state by using the state index of the picked-up fingerprint so that it can be recognized whether it can be used for fingerprint collation.
【図１】本発明の実施の形態の指紋照合装置の要部説明
図である。FIG. 1 is an explanatory view of a main part of a fingerprint collation device according to an embodiment of the present invention.
【図２】本発明の実施の形態の指紋登録のフローチャー
トである。FIG. 2 is a flowchart of fingerprint registration according to the embodiment of this invention.
【図３】本発明の実施の形態の指紋照合のフローチャー
トである。FIG. 3 is a flowchart of fingerprint matching according to the embodiment of this invention.
【図４】本発明の実施の形態の照合レベル設定のフロー
チャートである。FIG. 4 is a flowchart of collation level setting according to the embodiment of this invention.
【図５】本発明の実施の形態の指紋状態判定表示のフロ
ーチャートである。FIG. 5 is a flowchart of fingerprint state determination display according to the embodiment of the present invention.
【図６】従来の指紋登録のフローチャートである。FIG. 6 is a flowchart of conventional fingerprint registration.
【図７】従来の指紋照合のフローチャートである。FIG. 7 is a flowchart of conventional fingerprint matching.
１ 押捺面 ２ カメラ ３ 画像処理部 ４ 特徴点抽出部 ５ 指紋照合部 ６ 登録ファイル ７ 主制御部 ８ テンキー ９ 入力処理部 １０ 表示部 １１ 表示制御部 １２ 制御出力部 １３ 平均押捺回数算出部 １４ 平均状態指数算出部 １５ 照合レベル設定部 1 Stamping surface 2 camera 3 Image processing section 4 Feature point extractor 5 Fingerprint matching unit 6 registration files 7 Main control unit 8 numeric keypad 9 Input processing unit 10 Display 11 Display control unit 12 Control output section 13 Average number of impressions 14 Average condition index calculator 15 Collation level setting section
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Claims (4)
とを、設定した照合レベルに従って照合し、照合不一致
の時は再度指紋押捺を行う指紋照合処理方法に於いて、前記撮像指紋と前記登録指紋とが照合一致する までの指
紋押捺回数の平均値を示す平均押捺回数と、前記撮像指
紋の状態を示す状態指数の平均値を示す平均状態指数と
を求め、前記平均押捺回数が多い程前記照合レベルを低
く設定し、前記平均状態指数が大きい程前記照合レベル
を高く設定し、該照合レベルにより前記撮像指紋と前記
登録指紋とを照合する過程を含むことを特徴とする指紋
照合処理方法。1. A fingerprint collation processing method for collating an imaged fingerprint obtained by capturing an imprinted fingerprint with a registered fingerprint according to a set collation level, and performing fingerprint imprinting again when the collation does not match, wherein the imaged fingerprint and the registered fingerprint are registered. Finger until the fingerprint matches
The average inked number indicating the average value of the crest inked number, the seek and average condition index indicating the average value of the condition index indicating the condition of imaging the fingerprint, the matching level the more the average impressing count low
The higher the average condition index, the higher the matching level.
Is set to a higher value, and the step of matching the captured fingerprint with the registered fingerprint according to the matching level is included.
囲と、該第１の範囲より多い平均押捺回数の第２の範囲
と、該第２の範囲より更に多い平均押捺回数の第３の範
囲とを設定し、前記平均押捺回数が前記第１の範囲内で
且つ前記平均状態指数より今回の状態指数が上昇してい
る時は前記照合レベルを上昇して設定し、前記平均押捺
回数が前記第２の範囲を超えた前記第３の範囲内で且つ
前記平均状態指数より今回の状態指数が低下している時
は前記照合レベルを低下させて設定し、それ以外の時
は、前記照合レベルを前の状態に維持させる過程を含む
ことを特徴とする請求項１記載の指紋照合処理方法。2. A first range including once the average fingerprinting number, a second range of larger average impressing number than the first range, the further large average impressing number than the second range 3 sets a range, when said average current condition index and than the average condition index inked number in the first range is rising set to rise the matching level, the average impressing When the number of times is within the third range that exceeds the second range and the current state index is lower than the average state index
Is set by lowering the collation level, and at other times
The method of claim 1, further comprising the step of maintaining the matching level in the previous state.
捺面の押捺指紋を撮像した撮像指紋と前記登録指紋とを
照合する指紋照合部と、各部を制御する主制御部とを有
する指紋照合装置に於いて、 前記主制御部は、前記指紋照合部に於ける撮像指紋と登
録指紋との照合一致が得られるまでの前記押捺面に対す
る押捺回数を計数し、該押捺回数と過去の複数回の押捺
回数との平均値の平均押捺回数を求める平均押捺回数算
出部と、前記撮像指紋の状態指数を求めて該状態指数と
過去の複数回の状態指数との平均値の平均状態指数を求
める平均状態指数算出部と、前記指紋照合部に於ける撮
像指紋と登録指紋との照合判定の為の照合レベルを、前
記平均押捺回数が多い程低く設定し、前記平均状態指数
が大きい程高く設定する照合レベル設定部とを有する こ
とを特徴とする指紋照合装置。 3. A registration file for storing a registration fingerprint and a push-button.
An imaged fingerprint obtained by picking up an imprinted fingerprint on the imprinted surface and the registered fingerprint.
It has a fingerprint matching unit for matching and a main controller for controlling each unit.
In the fingerprint collation device, the main control unit registers with the imaged fingerprint in the fingerprint collation unit.
For the imprinted surface until a matching match with the fingerprint is obtained
The number of times of imprinting is counted, and the number of times of imprinting and past imprints
Calculate the average number of impressions by calculating the average number of impressions
And the state index of the imaging fingerprint is obtained.
Calculate the average state index of the average value with the past multiple state indices
The average state index calculation unit and the fingerprint matching unit
Set the matching level for the matching judgment between the image fingerprint and the registered fingerprint
The higher the average number of impressions, the lower it is set to
This and a matching level setting unit that sets high the larger
And a fingerprint matching device.
なくとも前記照合レベル設定部により設定した照合レベ
ルを前記表示部に表示させる表示制御部とを有すること
を特徴とする請求項３記載の指紋照合装置。 4. The processing contents of the display unit and the main control unit are small.
Even if the verification level set by the verification level setting unit
A display control unit for displaying the image on the display unit.
The fingerprint collation device according to claim 3, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25805397A JP3489091B2 (en) | 1997-09-24 | 1997-09-24 | Fingerprint collation processing method and fingerprint collation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25805397A JP3489091B2 (en) | 1997-09-24 | 1997-09-24 | Fingerprint collation processing method and fingerprint collation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1196358A JPH1196358A (en) | 1999-04-09 |
| JP3489091B2 true JP3489091B2 (en) | 2004-01-19 |
Family
ID=17314892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25805397A Expired - Fee Related JP3489091B2 (en) | 1997-09-24 | 1997-09-24 | Fingerprint collation processing method and fingerprint collation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3489091B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60039002D1 (en) * | 1999-05-17 | 2008-07-10 | Nippon Telegraph & Telephone | Device and method for surface pattern recognition |
| KR100884743B1 (en) | 2006-12-07 | 2009-02-19 | 한국전자통신연구원 | Method for matching fingerprint using minutiae and binary image and system using the same |
| JP5500180B2 (en) * | 2010-01-28 | 2014-05-21 | 富士通株式会社 | Fingerprint authentication apparatus, fingerprint authentication method, and fingerprint authentication program |
| CN107091704B (en) * | 2016-02-17 | 2020-10-09 | 北京小米移动软件有限公司 | Pressure detection method and device |
-
1997
- 1997-09-24 JP JP25805397A patent/JP3489091B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1196358A (en) | 1999-04-09 |
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