JP2008067727A - Personal authentication device - Google Patents

Personal authentication device Download PDF

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JP2008067727A
JP2008067727A JP2006246210A JP2006246210A JP2008067727A JP 2008067727 A JP2008067727 A JP 2008067727A JP 2006246210 A JP2006246210 A JP 2006246210A JP 2006246210 A JP2006246210 A JP 2006246210A JP 2008067727 A JP2008067727 A JP 2008067727A
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vein
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Takashi Nakao
隆司 中尾
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Hitachi Information and Control Systems Inc
Hitachi Information and Control Solutions Ltd
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Hitachi Information and Control Systems Inc
Hitachi Information and Control Solutions Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a personal authentication device capable of preventing unjust authentication by a forged finger or the like since authentication has to be inhibited for the unjust attempt of utilizing the forged finger or sticking a vein pattern to a living body finger or the like by a malicious user. <P>SOLUTION: The finger vein images of different wavelengths imaged in a finger vein image input device 1 are inputted to a different wavelength finger vein image input means 3. A different wavelength finger vein image difference detection means 4 detects the difference of the finger vein images of the different wavelengths inputted to the different wavelength finger vein image input means 3. A finger vein image determination means 5 determines whether or not the finger vein image is the finger vein image of a living body by comparing the difference detected in the different wavelength finger vein image difference detection means 4 and finger vein image determination data 6. A personal authentication means 7 is executed when it is determined that the finger vein image is the finger vein image of the living body in the finger vein image determination means 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は生体情報を用いて個人認証対象者が予め登録された個人と一致するか否かを判別する個人認証装置に関する。   The present invention relates to a personal authentication device that uses biometric information to determine whether a person subject to personal authentication matches a previously registered individual.

近年、財産や情報の安全な管理を目的として個人認証技術への期待が高まっている。特に、人体の一部を鍵として利用する生体認証技術は従来の暗証番号や鍵による管理に比べ遺失や盗難等による不正行使の恐れが少ないことから注目を集めている。生体認証技術としては指紋、顔、虹彩、手や指の血管パターンなどを用いた様々な手法があるが、指の血管パターンを用いた認証方法は、指紋のように犯罪を連想させたり、虹彩のように直接眼球に光を照射したりすることがないので心理的抵抗感が少なく、生体の表面ではなく内部の特徴を読み取るため偽造が困難という利点がある。   In recent years, expectations for personal authentication technology are increasing for the purpose of safe management of property and information. In particular, biometric authentication technology that uses a part of the human body as a key has attracted attention because it is less likely to be illegally exercised due to loss or theft compared to conventional management using a password or key. There are various biometric authentication techniques using fingerprints, faces, irises, hand and finger blood vessel patterns, etc., but authentication methods using finger blood vessel patterns are reminiscent of crimes like fingerprints or irises. As described above, since the eyeball is not directly irradiated with light, there is less psychological resistance, and there is an advantage that forgery is difficult because the internal features are read instead of the surface of the living body.

指静脈認証装置としては例えば特許文献１に記載されている。指静脈特徴の照合方法については例えば特許文献２に記載されている。また、照射光の波長によって血液中のヘモグロビンでのスペクトル吸収量が異なることが特許文献３に記載されている。   A finger vein authentication device is described in Patent Document 1, for example. A method for collating finger vein features is described in Patent Document 2, for example. Patent Document 3 describes that the amount of spectral absorption of hemoglobin in blood varies depending on the wavelength of irradiation light.

特許文献４には、１本の画像線あるいは少数の画像線を取得するとともに、指とセンサとの間の相対的移動中に得られる部分の画像間の相関により指紋画像全体を復元する手段を有する走査指紋画像センサを、１つの支持体上に有する個人認証装置であって、その指紋が前記画像センサにより記録される指の皮膚についてのスペクトル送信情報用センサをさらに有し、前記画像センサと前記スペクトル情報センサとを交互に機能させるように設計して当該指が生体のものかどうかを検出するようにした指紋画像による個人認証装置が記載されている。   Patent Document 4 discloses a means for acquiring one image line or a small number of image lines and restoring the entire fingerprint image by correlation between images of a portion obtained during relative movement between the finger and the sensor. A personal authentication device having a scanning fingerprint image sensor on a single support, further comprising a spectrum transmission information sensor for finger skin on which the fingerprint is recorded by the image sensor; and There is described a personal authentication device using a fingerprint image that is designed to function alternately with the spectrum information sensor so as to detect whether or not the finger is a living body.

特開２００４−４９７０５公報JP 2004-49705 A 特許第３５５８０２５号公報Japanese Patent No. 3558025 特許第２６４０４１２号公報Japanese Patent No. 2640412 特表２００６−５１８０６８号公報JP-T 2006-51068 Gazette

指静脈認証装置は指の上方あるいは側方から近赤外光を照射して指の下方にあるカメラで指静脈画像を取得する構造となっている。このような構造を利用して、悪意のある利用者が偽造指を使用したり、生体指に静脈パターンを貼り付けるなどにより不当に認証を試みるという可能性があり、このような不当な試みに対して認証が行われないようにしなければならないという課題がある。   The finger vein authentication device has a structure in which near-infrared light is irradiated from above or from the side of a finger and a finger vein image is acquired by a camera below the finger. Using such a structure, there is a possibility that a malicious user may attempt to authenticate illegally by using a fake finger or pasting a vein pattern on a biometric finger. However, there is a problem that it is necessary to prevent authentication.

本発明の目的は悪意のある利用者が偽造指などによる不当な認証を防ぐことができる個人認証装置を提供することにある。   An object of the present invention is to provide a personal authentication device that can prevent a malicious user from improperly authenticating with a forged finger or the like.

本発明の特徴とするところは、指静脈画像入力装置から波長の異なる照射光を用いて、異なる照射光の指静脈画像を入力し、異なる照射光の指静脈画像の差異を検出し、該差異が予め登録された閾値との判定を行うことにより生体の指静脈画像か否かを判定し、生体の指静脈画像であると判定された場合のみ個人認証を行うようにしたことにある。   The feature of the present invention is that a finger vein image of different irradiation light is input from the finger vein image input device using irradiation light having different wavelengths, a difference between the finger vein images of different irradiation light is detected, and the difference is detected. Is determined to be a threshold value registered in advance to determine whether or not it is a finger vein image of a living body, and only when it is determined that it is a finger vein image of a living body, personal authentication is performed.

本発明は、個人認証対象者の指静脈情報を入力して指静脈画像を生成し、該指静脈画像から指静脈特徴を抽出し、予め登録された指静脈特徴との比較照合を行うことにより、個人認証を行う個人認証装置において、
共通の支持部によって支持され、認証する指の静脈に沿って入り組んでそれぞれ羅列された少なくとも２つの光源体からなり、該光源体はそれぞれ異なった波長の透過光を発生させる光源と、認証対象の指を介在して前記光源の反対側に配置され、異なった波長の透過光を撮像する撮像部と、該撮像部によって撮像された異なった指静脈画像を照合することによって両者の差異を検出して生体指画像であるかを判定する生体指判定手段とを備えることを特徴とする個人認証装置を提供する。 The present invention generates finger vein images by inputting finger vein information of a person subject to personal authentication, extracts finger vein features from the finger vein images, and performs comparison and collation with previously registered finger vein features. In a personal authentication device that performs personal authentication,
It consists of at least two light source bodies supported by a common support part and encircled along the vein of the finger to be authenticated, each light source body generating a transmitted light of a different wavelength, and an authentication target A difference between the two is detected by collating an imaging unit that is arranged on the opposite side of the light source with a finger interposed therebetween and that captures transmitted light of different wavelengths and a different finger vein image captured by the imaging unit. There is provided a personal authentication device comprising biometric finger determination means for determining whether the image is a biometric finger image.

上述の個人認証装置は、前記生体指判定手段は異波長指静脈画像差異検出手段と異波長静脈画像の差異に基づいて生体指画像判定する生体指画像判定手段とからなることを特徴とする。   The above-described personal authentication device is characterized in that the biometric finger determination means includes a different-wave finger vein image difference detection means and a bio-finger image determination means that determines a bio-finger image based on a difference between different-wave vein images.

また、本発明は、個人認証対象者の静脈情報を入力して静脈画像を生成し、該静脈画像から静脈特徴を抽出し、予め登録された静脈特徴との比較照合を行うことにより、個人認証を行う個人認証装置において、
共通の支持部によって支持され、それぞれ羅列された少なくとも２つの光源体からなり、該光源体はそれぞれおおよそ８００ｎｍ波長より短い波長の近赤外線あるいは／および８００ｎｍよりも長い波長の近赤外線の内、異なった少なくとも２つの波長の透過光を発生させる光源と、認証対象の生体部を介在して前記光源の反対側に配置され、異なった波長の透過光を撮像する撮像部と、該撮像部によって撮像された異なった静脈画像によって少なくとも２つの異波長静脈表示画像を生成する異波長静脈表示画像生成手段とを備え、少なくとも２つの異波長静脈表示画像を照合することによって両者の差異を検出して、生体画像であるかを判定する生体指判定手段とを備えることを特徴とする個人認証装置を提供する。 In addition, the present invention generates a vein image by inputting the vein information of the person to be personally authenticated, extracts the vein feature from the vein image, and performs comparison and collation with the vein feature registered in advance. In the personal authentication device that performs
It comprises at least two light source bodies supported by a common support part, and each of the light source bodies has different near-infrared rays having wavelengths shorter than about 800 nm and / or longer than 800 nm. A light source that generates transmitted light of at least two wavelengths, an imaging unit that is disposed on the opposite side of the light source with a living body part to be authenticated interposed therebetween, and an image that is captured by the imaging unit A different-wavelength vein display image generating means for generating at least two different-wavelength vein display images based on different vein images, and detecting a difference between the two by collating at least two different-wavelength vein display images. There is provided a personal authentication device comprising biometric finger determination means for determining whether or not an image.

本発明は、指静脈画像入力装置から異なる波長の照明による指静脈画像を入力し、該異なる波長の指静脈画像の差異を検出し、該差異が予め登録された指静脈画像判定データとの比較を行うことができ、生体の指静脈画像か否かを表示し、あるいは判定し、生体の指静脈画像であると表示あるいは判定された場合に個人認証を行うように構成することができ、この構成によって悪意のある利用者が偽造指などを用いた不当な認証を防ぐことができる。   The present invention inputs a finger vein image by illumination of different wavelengths from a finger vein image input device, detects a difference between the finger vein images of different wavelengths, and compares the difference with pre-registered finger vein image determination data It can be configured to display or determine whether or not it is a finger vein image of a living body, and to perform personal authentication when it is displayed or determined to be a finger vein image of a living body. The configuration can prevent a malicious user from improperly authenticating with a forged finger or the like.

以下、本発明の実施例を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の実施例である個人認証装置をブロック図で示している。
図１において、個人認証装置１００は、指静脈画像入力装置１と個人認証処理装置２とからなり、個人認証処理装置２は異波長指静脈画像入力手段３、生体指判定手段１０、指静脈画像判定用データ６および個人認証手段７を備えている。指静脈画像入力装置１から入力された指静脈画像を使用して個人認証処理装置２が個人認証処理を行うことはよく知られており、また個人認証処理のために予め個人認証対象者の指静脈を登録処理（メモリ）に登録しておくことはよく知られている。 FIG. 1 is a block diagram showing a personal authentication apparatus according to an embodiment of the present invention.
In FIG. 1, a personal authentication device 100 includes a finger vein image input device 1 and a personal authentication processing device 2, and the personal authentication processing device 2 includes different wavelength finger vein image input means 3, biometric finger determination means 10, finger vein image. Determination data 6 and personal authentication means 7 are provided. It is well known that the personal authentication processing device 2 uses the finger vein image input from the finger vein image input device 1 to perform personal authentication processing. It is well known to register veins in the registration process (memory).

指静脈画像入力装置１は、例えば建物の扉脇に配置され、個人認証対象者である入室者あるいは退室者が入室あるいは退室の許可を得るために認証対象の指を指静脈画像入力装置１に提供する。   The finger vein image input device 1 is arranged, for example, on the side of a door of a building, and a person who is a person for personal authentication enters or leaves the finger vein image input device 1 in order to obtain permission to enter or leave the room. provide.

本実施例は、指静脈画像入力装置１から入力される指静脈画像を使用することを内容とするが、認証生体部分として指に限定されず、指静脈画像を撮像できる部位であれば他の生体部分であっても構わない。以下、指静脈を例に取って説明するが、他の生体部分をも含む場合には「指」の限定せずあるいは「指」について「生体部分」と読み替えるものとする。   The present embodiment is intended to use a finger vein image input from the finger vein image input device 1, but is not limited to a finger as an authentication biometric part, and any other part can be used as long as it can capture a finger vein image. It may be a living body part. Hereinafter, a finger vein will be described as an example. However, when other biological parts are included, “finger” is not limited, or “finger” is read as “biological part”.

指静脈画像入力装置１は、特許文献１に示される個人認証装置の指静脈画像取得部が参照される。指静脈画像入力装置１は、発光する波長が異なる２種類（波長１、波長２）のＬＥＤを具備する。本実施例は、２種類のＬＥＤを羅列する構成を持つが、この構成については後述する。   For the finger vein image input device 1, the finger vein image acquisition unit of the personal authentication device disclosed in Patent Document 1 is referred to. The finger vein image input apparatus 1 includes two types of LEDs (wavelength 1 and wavelength 2) having different emission wavelengths. The present embodiment has a configuration in which two types of LEDs are arranged, and this configuration will be described later.

指静脈画像入力装置１によって波長１を用いた指静脈画像と波長２を用いた指静脈画像と撮像部を備え、得られた撮像情報を処理部で処理することによって取得する。指静脈入力装置１で取得された波長異なる指静脈画像は異波長指静脈画像として個人認証処理装置２の異波長指静脈画像入力手段３に入力される。   The finger vein image input device 1 includes a finger vein image using the wavelength 1, a finger vein image using the wavelength 2, and an imaging unit, and the obtained imaging information is processed by the processing unit. The finger vein images having different wavelengths acquired by the finger vein input device 1 are input to the different wavelength finger vein image input means 3 of the personal authentication processing device 2 as different wavelength finger vein images.

生体指判定手段１０は、入力された異波長指静脈画像を使用して以下のようにして入力された指静脈画像が、すなわち入力した個人認証用の指静脈画像が生体である指静脈画像であること、あるいは生体ではない偽の指静脈画像であることを判定を行う。   The biometric finger determination means 10 uses the input different wavelength finger vein image as an input finger vein image as described below, that is, a finger vein image in which the input finger vein image for personal authentication is a living body. It is determined whether or not the image is a false finger vein image that is not a living body.

生体指判定手段１０は、異波長指静脈画像差異検出手段４と指静脈画像判定手段５とからなり、指静脈画像判定手段５は指静脈画像判定用データ６を参照できるように構成される。従って、異波長指静脈画像差異検出手段４は、異波長指静脈画像入力手段３に入力された波長の異なる指静脈画像を用いて指静脈画像の差異を検出する。   The biometric finger determination unit 10 includes a different wavelength finger vein image difference detection unit 4 and a finger vein image determination unit 5. The finger vein image determination unit 5 is configured to be able to refer to the finger vein image determination data 6. Therefore, the different wavelength finger vein image difference detection unit 4 detects the difference between the finger vein images using the finger vein images having different wavelengths input to the different wavelength finger vein image input unit 3.

指静脈画像判定手段５は、異波長指静脈画像差異検出手段４で検出した差異と指静脈画像判定データ６とを比較することによって異波長指静脈差異画像が生体の指静脈画像か否かを判定する。異波長指静脈差異画像が生体の指静脈画像で判定されると、個人認証手段７によって通常の手法に従って個人認証処理が行われる。すなわち、個人認証手段７は、取得された指静脈画像と予め登録されている指静脈画像とを照合比較することによって個人認証処理を行う。この場合に、個人認証処理に使用される指静脈画像は、異波長指静脈画像入力手段３に入力された判定用の指静脈画像の一部を使用してもよいし、改めて個人認証用に使用した指静脈画像を使用してもよい。   The finger vein image determination unit 5 compares the difference detected by the different wavelength finger vein image difference detection unit 4 with the finger vein image determination data 6 to determine whether the different wavelength finger vein difference image is a finger vein image of a living body. judge. When the different wavelength finger vein difference image is determined from the finger vein image of the living body, the personal authentication process is performed by the personal authentication unit 7 according to a normal method. That is, the personal authentication means 7 performs personal authentication processing by comparing and comparing the acquired finger vein image with a finger vein image registered in advance. In this case, as the finger vein image used for the personal authentication process, a part of the finger vein image for determination input to the different wavelength finger vein image input means 3 may be used. The used finger vein image may be used.

図２は、個人認証装置１００の異波長指静脈画像取得部１１０の断面を示し、図３は図２について指方向から見たＬＥＤの配置状況を示す図である。   FIG. 2 is a cross-sectional view of the different wavelength finger vein image acquisition unit 110 of the personal authentication device 100, and FIG. 3 is a diagram illustrating an LED arrangement state as viewed from the finger direction in FIG.

図２および図３において、異波長指静脈画像取得部９０は、本体１１と、本体１１の中央部に設けた指２０を置く指配置部１２と指２０の両側すなわち指配置部１２の両側に設けたＬＥＤ設置部１３と撮像部１４とからなる。この図ではＬＥＤ設置部１３は上側に、そして撮像部１４は下側に配置されているが、この配置には限定されない。双方を逆配置としても上下ではなく横方向配置としてもよい。いずれにしても指２０を介在して両者は対向配置され、撮像部１４は透過光を撮像して指静脈画像を生成する。従って、撮像部１４は指静脈画像生成手段を内蔵する。   2 and 3, the different wavelength finger vein image acquisition unit 90 includes a main body 11, a finger placement unit 12 for placing a finger 20 provided at the center of the main body 11, and both sides of the finger 20, that is, both sides of the finger placement unit 12. The LED installation unit 13 and the imaging unit 14 are provided. In this figure, the LED installation unit 13 is arranged on the upper side and the imaging unit 14 is arranged on the lower side, but the arrangement is not limited to this. Both may be arranged in the horizontal direction instead of up and down even if they are arranged in reverse. In any case, the two are placed opposite to each other with the finger 20 interposed therebetween, and the imaging unit 14 captures transmitted light and generates a finger vein image. Therefore, the imaging unit 14 includes a finger vein image generation unit.

ＬＥＤ設置部１３は、支持部１５を有し、共通の支持部１５に支持され、認証する指２０の静脈に沿って入り組んでそれぞれ羅列された少なくとも２つのＬＥＤからなる光源体１６，１７が設けられる。光源体１６，１７はそれぞれ異なった波長（波長１，波長２）の透過光（照射光）を発生させる光源となる。   The LED installation unit 13 includes a support unit 15, and is provided with light source bodies 16 and 17 each including at least two LEDs that are supported by the common support unit 15 and arranged in a line along the vein of the finger 20 to be authenticated. It is done. The light source bodies 16 and 17 serve as light sources that generate transmitted light (irradiation light) having different wavelengths (wavelength 1 and wavelength 2).

図３は、２つの光源１６，１７の羅列状況を示す。図３（１）に示す例にあっては、２つの光源体１６，１７は格子状に規則正しく２列として１個置きに交互に配置してあるが、ランダムであっても２列以上であってもよく、認証する指２０の静脈に沿って入り組んでそれぞれ羅列すれば、１列であっても波長１および波長２について判定用の指静脈画像を精確に生成することができる。変形例を図３（２）および図３（３）に示す。図３（２）に示す例は、２列であるが一方が波長１の列とし、他方を波長２の列として羅列している。図３（３）に示す例は、１列の羅列として波長１のものと波長２のものとを入り組ませている。   FIG. 3 shows an enumeration state of the two light sources 16 and 17. In the example shown in FIG. 3 (1), the two light source bodies 16 and 17 are regularly arranged in every other row as two rows in a lattice pattern. Alternatively, if they are arranged along the veins of the finger 20 to be authenticated, they can be accurately generated for the wavelength 1 and the wavelength 2 even if there is only one row. Modifications are shown in FIGS. 3 (2) and 3 (3). In the example shown in FIG. 3 (2), there are two rows, one being a wavelength 1 row and the other being a wavelength 2 row. In the example shown in FIG. 3 (3), the wavelength 1 and the wavelength 2 are intricately arranged as one row.

図４は、生体指判定に用いる好ましい波長１および波長２の例を示す。図４に概略示すように、近赤外線における波長で、特に酸素ヘモグロビン（酸化型ヘモグロビン）とヘモグロビン（脱酸素型ヘモグロビン）間の吸収スペクトルの等吸収点は、おおよそ８００ｎｍであることが知られている。本実施例にあっては波長１として８００ｎｍより短波長の近赤外線を使用し、波長２として８００ｎｍより長波長の近赤外線を使用して血液の存在を検出する。おおよそ８００ｎｍの波長付近を避けて異なる少なくとも２つの波長（近赤外線）を選択することによってよりよく血液の存在を検出することができる。   FIG. 4 shows an example of preferable wavelength 1 and wavelength 2 used for biological finger determination. As schematically shown in FIG. 4, it is known that the isosbestic point of the absorption spectrum between oxygen hemoglobin (oxidized hemoglobin) and hemoglobin (deoxygenated hemoglobin) at a wavelength in the near infrared is approximately 800 nm. . In the present embodiment, near infrared light having a wavelength shorter than 800 nm is used as wavelength 1, and the presence of blood is detected using near infrared light having a wavelength longer than 800 nm as wavelength 2. The presence of blood can be better detected by selecting at least two different wavelengths (near infrared) avoiding around the wavelength of approximately 800 nm.

すなわち光源体１６，１７はそれぞれおおよそ８００ｎｍ波長をはずして８００ｎｍ波長よりも近い波長の近赤外線あるいは／および８００ｎｍよりも長い波長の近赤外線の内、異なった少なくとも２つの波長を選択して透過光を発光するものとする。この場合に、一方を８００ｎｍよりも近い例の波長を、他方を８００ｎｍよりも長い例の波長を選択する方が図５に示す異波長指静脈差異画像を生成する上で望ましい。   That is, each of the light source bodies 16 and 17 removes a wavelength of approximately 800 nm and selects at least two different wavelengths from the near infrared having a wavelength closer to the wavelength of 800 nm and / or the near infrared having a wavelength longer than 800 nm to transmit the transmitted light. It shall emit light. In this case, it is preferable to select one of the wavelengths closer to 800 nm and the other longer than 800 nm to generate the different wavelength finger vein difference image shown in FIG.

図５は、生体判定を画像を使用して行う方法について示す。波長の異なる透過光による異波長指静脈画像は図５（Ａ）および図５（Ｂ）のように示される。これらの図は、ヘモグロビンの光の吸収度合いが異なることによって静脈部分３１Ａ，３１Ｂの輝度が異なる濃淡画像となる。   FIG. 5 shows a method for performing biometric determination using an image. Different wavelength finger vein images by transmitted light having different wavelengths are shown in FIGS. 5 (A) and 5 (B). These figures become grayscale images in which the luminance of the vein portions 31A and 31B varies depending on the degree of light absorption of hemoglobin.

図５（Ａ）および図５（Ｂ）の差異を示す異波長指静脈差異画像が照合によって図５（Ｃ）のように検出される。生体の指静脈でない場合には、図５（Ａ）および図５（Ｂ）に示す静脈部分の輝度はほぼ同一となって図５（Ｃ）に示すような明確な差分を示す異波長指静脈差異画像とはならない。   A different wavelength finger vein difference image showing the difference between FIG. 5 (A) and FIG. 5 (B) is detected as shown in FIG. 5 (C). When the finger vein is not a biological finger vein, the luminance of the vein portion shown in FIGS. 5A and 5B is almost the same, and the different wavelength finger vein showing a clear difference as shown in FIG. 5C. It is not a difference image.

図５（Ｃ）によって表示される異波長指静脈差異画像を２値化して２値化静脈画像３１Ｃを生成する。この２値化静脈画像と指静脈画像判定用データ６である２値化静脈参照画像５Ｄとをマスク処理してマスク結果を示す図５（Ｄ）に示すマスク結果画像３１Ｅとする。このマスク結果画像が生体判別を示す生体判別となる。すなわち、マスク結果画像１５濃淡画像であり、各画素の輝度値０（黒）〜２５５（白）の値を持ち、生体の場合の画像と生体でない場合の画像とでは明確な違いとして表示される。   The binarized vein image 31C is generated by binarizing the different wavelength finger vein difference image displayed in FIG. 5C. This binarized vein image and the binarized vein reference image 5D which is the finger vein image determination data 6 are masked to obtain a mask result image 31E shown in FIG. This mask result image becomes the biometric discrimination indicating the biometric discrimination. That is, the mask result image 15 is a grayscale image having luminance values of 0 (black) to 255 (white) of each pixel, and is displayed as a clear difference between an image in the case of a living body and an image in the case of a non-living body. .

指静脈画像判定用データ６は一方の波長によっても生成される。例えば、波長１の指静脈画像を２値化して２値化静脈画像を生成し、２値化静脈参照画像５Ｄとしてもよい。これらの画像３１Ａ、３１Ｂ、３１Ｃ、３１Ｄ、３１Ｅはそれぞれ画像表示装置の画面に各画像と表示される。３１Ａおよび３１Ｂで示す２つの異波長静脈表示画像を生成する手段が異波長静脈表示画像生成手段であり、３１Ｃで示す異波長指静脈差異画像を生成する手段が異波長指静脈差異画像生成手段であり、３１Ｄで示す。   The finger vein image determination data 6 is also generated with one wavelength. For example, the finger vein image of wavelength 1 may be binarized to generate a binarized vein image and may be used as the binarized vein reference image 5D. These images 31A, 31B, 31C, 31D, and 31E are displayed as images on the screen of the image display device. The means for generating two different wavelength vein display images indicated by 31A and 31B is the different wavelength vein display image generating means, and the means for generating the different wavelength finger vein difference images indicated by 31C is the different wavelength finger vein difference image generating means. Yes, indicated by 31D.

静脈参照画像を生成する手段が静脈参照画像生成手段であり、そして３１Ｅに示すマスク結果画像を生成する手段が判別画像生成手段である。   The means for generating the vein reference image is the vein reference image generating means, and the means for generating the mask result image shown in 31E is the discrimination image generating means.

以上のように、本実施例の個人認証装置１００は、共通の支持部１５によって支持され、認証する指２０に沿って入り組んでそれぞれ羅列された少なくとも２つの光源体１６，１７からなり、光源体１６，１７はそれぞれ異なった波長の波長１と波長２の透過光を発生させる光源となり、撮像部１４によって撮像された異なった指静脈画像を照合することによって両者の差異（差分）を検出して生体指画像であるかを判定する生体指判定手段１０を備えることになる。   As described above, the personal authentication device 100 according to the present embodiment includes at least two light source bodies 16 and 17 that are supported by the common support unit 15 and arranged in a line along the finger 20 to be authenticated. Reference numerals 16 and 17 denote light sources that generate transmitted light having different wavelengths 1 and 2, respectively. By comparing different finger vein images imaged by the imaging unit 14, the difference (difference) between the two is detected. Biometric finger determination means 10 for determining whether the image is a biometric finger image is provided.

上述の場合は、認証対象の指を介在して撮像部１４の反対側に配置される２つの光源体１６，１７の配置に１つの特徴を有するが、光減体１６，１７に使用する異なる波長に着目した場合には、個人認証装置１００は、共通の支持部１５によって支持され、それぞれ羅列された少なくとも２つの光源体１６，１７からなり、光源体１６，１７はそれぞれおおよそ８００ｎｍ波長より近い波長の近赤外線とおおよそ８００ｎｍ波長より長い波長の近赤外線の透過光を発生させる光源と、認証対象の指２０を介在して光源の反対側に配置され、異なった波長の透過光を撮像する撮像部１４と、撮像部１４によって撮像された異なった指静脈画像によって少なくとも２つの異波長指静脈表示画像を生成する異波長指静脈表示画像生成手段とを備えることを特徴とすることになる。   In the above-described case, the arrangement of the two light source bodies 16 and 17 arranged on the opposite side of the imaging unit 14 with the finger to be authenticated has one characteristic, but the light sources 16 and 17 are different in use. When paying attention to the wavelength, the personal authentication device 100 is composed of at least two light source bodies 16 and 17 that are supported by a common support portion 15 and arranged in a row, and the light source bodies 16 and 17 are each closer to a wavelength of approximately 800 nm. A light source that generates near infrared light having a wavelength and a near infrared light having a wavelength longer than approximately 800 nm, and an image that is disposed on the opposite side of the light source via the finger 20 to be authenticated, and images transmitted light having different wavelengths Unit 14 and different wavelength finger vein display image generation means for generating at least two different wavelength finger vein display images from different finger vein images captured by the imaging unit 14. It will be characterized and.

そして、指２０を含めた生体の静脈に本実施例を適用すると、共通の支持部１５によって支持され、それぞれ羅列された少なくとも２つの光源体１６，１７からなり、光源体１６，１７はそれぞれおおよそ８００ｎｍ波長よりも短い波長の近赤外線と８００ｎｍ波長よりも長い波長の近赤外線の透過光を発生させる光源と、認証対象の生体部を介在して光源の反対側に配置され、異なった波長の透過光を撮像する撮像部１４と、撮像部１４によって撮像された異なった静脈画像によって少なくとも２つの異波長静脈表示画像を生成する異波長静脈表示画像生成手段とを備えることを特徴とする個人認証装置１００が構成されることになる。   When this embodiment is applied to a living body vein including the finger 20, the light source bodies 16 and 17 are each composed of at least two light source bodies 16 and 17 that are supported by a common support portion 15 and are enumerated. A light source that generates near-infrared light having a wavelength shorter than 800 nm and near-infrared light having a wavelength longer than 800 nm and a biological part to be authenticated are disposed on the opposite side of the light source, and transmit different wavelengths. A personal authentication apparatus comprising: an imaging unit that captures light; and a different wavelength vein display image generation unit that generates at least two different wavelength vein display images based on different vein images captured by the imaging unit 100 will be configured.

次に図２のフローチャートを参照して動作を説明する。
指静脈画像入力装置１に提示された対象者の指に対して波長の異なる照射光による指静脈画像が異波長指静脈画像入力処理（Ｓ１）で入力され、例えば図５Ａと図５Ｂに示すようにヘモグロビンの光の吸収度合いが異なることにより静脈部分の輝度が異なる画像が得られる。異波長指静脈画像差異検出処理（Ｓ２）では該波長の異なる照射光による指静脈画像の差異が検出される。指静脈画像判定処理（Ｓ３）では該差異と予め登録されている指静脈画像判定データ６とを比較することにより該指静脈画像が生体の指静脈画像か否かを判定する。個人認証処理（Ｓ４）は指静脈画像判定処理（Ｓ３）の結果として該指静脈画像が生体の指静脈画像であるとの判定結果の場合にのみ個人認証を行うことにより悪意のある利用者が偽造指などを用いた不当な認証を防ぐことができる。 Next, the operation will be described with reference to the flowchart of FIG.
The finger vein image by the irradiation light with a different wavelength is input to the subject's finger presented on the finger vein image input device 1 by the different wavelength finger vein image input processing (S1), for example, as shown in FIGS. 5A and 5B. In addition, since the degree of light absorption of hemoglobin is different, images with different brightness of the vein portion are obtained. In the different wavelength finger vein image difference detection process (S2), a difference in finger vein images due to irradiation light having different wavelengths is detected. In the finger vein image determination process (S3), it is determined whether or not the finger vein image is a biological finger vein image by comparing the difference with the finger vein image determination data 6 registered in advance. In the personal authentication process (S4), the malicious user can perform the personal authentication only when the finger vein image is a determination result that the finger vein image is a living finger vein image as a result of the finger vein image determination process (S3). Unauthorized authentication using forged fingers can be prevented.

次に図７のフローチャートを参照してＳ２の動作を詳細説明する。
例えば異なる波長を波長１と波長２とし、波長１の指静脈画像の例が前述のように、図５Ａ、波長２の指静脈画像の例を図５Ｂとして示される。図５Ａおよび図５Ｂは実際には濃淡画像であり、生体の指静脈の場合には静脈部分の輝度が異なり、生体の指静脈でない場合には静脈部分の輝度がほぼ同一となる。波長１と波長２の指静脈画像の差分画像（図５Ｃ）を生成する（Ｓ２１）。波長１での指静脈画像２値化して２値化静脈画像（図５Ｄ）を生成する（Ｓ２２）。該差分画像に対して２値化静脈画像をマスク処理してマスク結果画像（図５Ｅ）を生成する。マスク結果画像は濃淡であり各画素の輝度値は０（黒）〜２５５（白）の値を持つ。 Next, the operation of S2 will be described in detail with reference to the flowchart of FIG.
For example, wavelength 1 and wavelength 2 are different wavelengths, and an example of a finger vein image of wavelength 1 is shown in FIG. 5A and an example of a finger vein image of wavelength 2 is shown in FIG. 5B as described above. FIG. 5A and FIG. 5B are actually grayscale images. In the case of a living finger vein, the brightness of the vein portion is different, and in the case of not being a living finger vein, the brightness of the vein portion is almost the same. A difference image (FIG. 5C) between the finger vein images of wavelength 1 and wavelength 2 is generated (S21). The finger vein image at wavelength 1 is binarized to generate a binarized vein image (FIG. 5D) (S22). A masking result image (FIG. 5E) is generated by masking the binary vein image with respect to the difference image. The mask result image is shaded, and the luminance value of each pixel has a value of 0 (black) to 255 (white).

次に図８のフローチャートを参照してＳ３の動作を詳細説明する。
２値化静脈画像（図５Ｄ）の黒画素数として２値化黒画素数を計測する（Ｓ３１）。マスク結果画像（図５Ｅ）の黒画素の輝度合計値を計測する（Ｓ３２）。該輝度合計値を該２値化黒画素数で除することにより２値化黒画素数に対する輝度合計値の比率を計測する（Ｓ３３）。該比率が予め登録された指静脈画像判定用データである閾値以上か否かを判定し（Ｓ３４）、以上であれば該指静脈画像は生体の指静脈画像であると判定し（Ｓ３５）、以上でなければ生体の指静脈画像ではないと判定する（Ｓ３６）。 Next, the operation of S3 will be described in detail with reference to the flowchart of FIG.
The number of binarized black pixels is measured as the number of black pixels in the binarized vein image (FIG. 5D) (S31). The total luminance value of black pixels in the mask result image (FIG. 5E) is measured (S32). By dividing the total luminance value by the binarized black pixel number, the ratio of the total luminance value to the binarized black pixel number is measured (S33). It is determined whether or not the ratio is equal to or greater than a threshold value that is pre-registered finger vein image determination data (S34). If it is equal to or greater than this, it is determined that the finger vein image is a finger vein image of a living body (S35). Otherwise, it is determined that the finger vein image is not a living body (S36).

悪意のある利用者が偽造指を使用したり生体指に静脈パターンを貼り付けるなどの不当な試みに対して認証が行われないようにしなければならないという課題に対して、本発明では波長の異なる照射光を用いた指静脈画像の差異を判定することにより、不当な認証を防ぐことが可能となる。   In the present invention, the wavelength is different from the problem that a malicious user must be prevented from authenticating against an unjust attempt such as using a fake finger or attaching a vein pattern to a living finger. By determining the difference between the finger vein images using the irradiation light, it is possible to prevent unauthorized authentication.

本発明の実施例の構成を示すブロック図。The block diagram which shows the structure of the Example of this invention. 個人認証装置の異波長指静脈画像取得部の構成を示す断面図。Sectional drawing which shows the structure of the different wavelength finger vein image acquisition part of a personal authentication apparatus. 図２において指方向から見た外観を拡大して示す図とその外観変形を示す図。The figure which expands and shows the external appearance seen from the finger direction in FIG. 2, and the figure which shows the external appearance deformation | transformation. 異波長の時のヘモグロビン、酸素ヘモグロビンについての吸収スペクトルとの関係を示す図。The figure which shows the relationship with the absorption spectrum about the hemoglobin at the time of a different wavelength, and oxygen hemoglobin. 生成され表示される各種指静脈画像の例を示す図。The figure which shows the example of the various finger vein images produced | generated and displayed. 本発明の動作を説明するためのフローチャート。The flowchart for demonstrating operation | movement of this invention. 本発明の異波長指静脈画像差異検出処理Ｓ２の動作を説明するためのフローチャート。The flowchart for demonstrating operation | movement of the different wavelength finger vein image difference detection process S2 of this invention. 本発明の指静脈画像判定処理Ｓ３の動作を説明するためのフローチャート。The flowchart for demonstrating operation | movement of the finger vein image determination process S3 of this invention.

符号の説明Explanation of symbols

１…指静脈画像入力装置、２…個人認証処理装置、３…異波長指静脈画像入力手段、４…異波長指静脈画像差異検出手段、５…指静脈画像判定手段、６…指静脈画像判定用データ、７…個人認証手段、１０…生体指判定手段、１１…本体、１２…指配置部、１３…ＬＥＤ設置部、１４…撮像部、１５…支持部、１６，１７…光源体（ＬＥＤ）、２０…指、９０…異波長指静脈画像取得部、１００…個人認証装置。   DESCRIPTION OF SYMBOLS 1 ... Finger vein image input apparatus, 2 ... Personal authentication processing apparatus, 3 ... Different wavelength finger vein image input means, 4 ... Different wavelength finger vein image difference detection means, 5 ... Finger vein image determination means, 6 ... Finger vein image determination Data: 7 ... Personal authentication means, 10 ... Biometric finger determination means, 11 ... Main body, 12 ... Finger placement section, 13 ... LED installation section, 14 ... Imaging section, 15 ... Support section, 16, 17 ... Light source body (LED ), 20... Finger, 90... Different wavelength finger vein image acquisition unit, 100.

Claims (4)

個人認証対象者の指静脈情報を入力して指静脈画像を生成し、該指静脈画像から指静脈特徴を抽出し、予め登録された指静脈特徴との比較照合を行うことにより、個人認証を行う個人認証装置において、
共通の支持部によって支持され、認証する指の静脈に沿って入り組んでそれぞれ羅列された少なくとも２つの光源体からなり、該光源体はそれぞれ異なった波長の透過光を発生させる光源と、認証対象の指を介在して前記光源の反対側に配置され、異なった波長の透過光を撮像する撮像部と、該撮像部によって撮像された異なった指静脈画像を照合することによって両者の差異を検出して生体指画像であるかを判定する生体指判定手段とを備えることを特徴とする個人認証装置。 Personal vein authentication is performed by generating finger vein images by inputting the finger vein information of the person to be authenticated, extracting the finger vein features from the finger vein images, and performing comparison and matching with the finger vein features registered in advance. In the personal authentication device to perform,
It consists of at least two light source bodies supported by a common support part and encircled along the vein of the finger to be authenticated, each light source body generating a transmitted light of a different wavelength, and an authentication target A difference between the two is detected by collating an imaging unit that is arranged on the opposite side of the light source with a finger interposed therebetween and that captures transmitted light of different wavelengths and a different finger vein image captured by the imaging unit. And a biometric finger determining means for determining whether the image is a biometric finger image. 請求項１において、前記生体指判定手段は異波長指静脈画像差異検出手段と異波長静脈画像の差異に基づいて生体指画像判定する生体指画像判定手段とからなることを特徴とする個人認証装置。   2. The personal authentication device according to claim 1, wherein the biometric finger determination unit includes a different-wave finger vein image difference detection unit and a bio-finger image determination unit that determines a bio-finger image based on a difference between different-wave vein images. . 個人認証対象者の静脈情報を入力して静脈画像を生成し、該静脈画像から静脈特徴を抽出し、予め登録された静脈特徴との比較照合を行うことにより、個人認証を行う個人認証装置において、
共通の支持部によって支持され、それぞれ羅列された少なくとも２つの光源体からなり、該光源体はそれぞれおおよそ８００ｎｍ波長より短い波長の近赤外線あるいは／および８００ｎｍよりも長い波長の近赤外線の内、異なった少なくとも２つの波長の透過光を発生させる光源と、認証対象の生体部を介在して前記光源の反対側に配置され、異なった波長の透過光を撮像する撮像部と、該撮像部によって撮像された異なった静脈画像によって少なくとも２つの異波長静脈表示画像を生成する異波長静脈表示画像生成手段とを備え、少なくとも２つの異波長静脈表示画像を照合することによって両者の差異を検出して、生体画像であるかを判定する生体指判定手段とを備えることを特徴とする個人認証装置。 In a personal authentication device that performs personal authentication by generating vein images by inputting the vein information of a person subject to personal authentication, extracting vein features from the vein images, and performing comparison and collation with vein features registered in advance ,
It comprises at least two light sources that are supported by a common support and are enumerated, and each of the light sources has different near-infrared rays having wavelengths shorter than about 800 nm and / or near-infrared wavelengths longer than 800 nm. A light source that generates transmitted light of at least two wavelengths, an imaging unit that is disposed on the opposite side of the light source with a living body part to be authenticated interposed therebetween, and an image that is captured by the imaging unit A different-wavelength vein display image generating means for generating at least two different-wavelength vein display images based on different vein images, and detecting a difference between the two by collating at least two different-wavelength vein display images. A personal authentication apparatus, comprising: a biometric finger determining unit that determines whether the image is an image. 請求項３において、前記生体判定手段は異波長静脈画像差異検出手段と異波長静脈画像の差異に基づいて生体画像判定する生体画像判定手段とからなることを特徴とする個人認証装置。   4. The personal authentication apparatus according to claim 3, wherein the biometric determination unit includes a different wavelength vein image difference detection unit and a biometric image determination unit that determines a biometric image based on a difference between the different wavelength vein images.
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