JP2000201907A - Fingerprint detecting method - Google Patents
Fingerprint detecting methodInfo
- Publication number
- JP2000201907A JP2000201907A JP11007279A JP727999A JP2000201907A JP 2000201907 A JP2000201907 A JP 2000201907A JP 11007279 A JP11007279 A JP 11007279A JP 727999 A JP727999 A JP 727999A JP 2000201907 A JP2000201907 A JP 2000201907A
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- Japan
- Prior art keywords
- substrate
- fingerprint
- finger
- detection method
- fingerprint detection
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、人間の指の指紋を
検出する指紋検出方法に関し、特に、個人認証を行う際
に使用される指紋検出方法に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a fingerprint detection method for detecting a fingerprint of a human finger, and more particularly to a fingerprint detection method used for personal authentication.
【０００２】[0002]
【従来の技術】従来の指紋検出方法には、図５に示すよ
うな全反射法が用いられている。この方法は、テレビジ
ョン学会誌４４巻、９号、１９９０年、１２４６頁に開
示されている。2. Description of the Related Art In a conventional fingerprint detection method, a total reflection method as shown in FIG. 5 is used. This method is disclosed in the Journal of the Institute of Television Engineers of Japan, Vol. 44, No. 9, 1990, p. 1246.
【０００３】この方法の場合、光源１０はプリズム斜面
１１のガラス／空気境界面で全反射条件を満たすように
置かれる。人間の指２は、プリズム斜面１１に押し当て
られる。光源１０からの光はプリズム斜面１１に接触し
ない指紋凹部１３で全反射され、可視カメラ１２に入射
する。一方、プリズムに接触する指紋凸部（指紋隆線
部）１４では指表面の水分と油分の屈折率が空気の屈折
率より大きいため、全反射条件が満たされなくなり光源
からの光は乱反射される。この方法では、全反射光によ
る明るい背景に対して、指紋隆線部の暗い指紋画像が検
出される。In this method, the light source 10 is placed so as to satisfy the condition of total reflection at the glass / air interface of the prism slope 11. The human finger 2 is pressed against the prism slope 11. Light from the light source 10 is totally reflected by the fingerprint concave portion 13 that does not contact the prism slope 11 and enters the visible camera 12. On the other hand, since the refractive index of water and oil on the finger surface is larger than the refractive index of air at the fingerprint convex portion (fingerprint ridge portion) 14 that comes into contact with the prism, the condition of total reflection is not satisfied, and light from the light source is irregularly reflected. . In this method, a dark fingerprint image of a fingerprint ridge portion is detected with respect to a bright background due to total reflection light.
【０００４】他の指紋検出方法として、Lucent Technol
ogies Bell Laboratories によって直接接触型指紋検出
器が提案されている（NIKKEI ELECTRONIS １９９８年２
月９日、７０９号、１４９頁）。As another fingerprint detection method, Lucent Technol
ogies Bell Laboratories has proposed a direct contact fingerprint detector (NIKKEI ELECTRONIS 1998 February 2).
March 9, 709, p. 149).
【０００５】この検出器は、図６に示すように、セルサ
イズ５０μｍ角の容量セル２１が３００×３００個アレ
イ状にＳｉ基板２０上に配置されたもので、指紋隆線部
２７が容量セル２１に触れると、セル内の金属センサプ
レート２４と人間の指２との間の容量（Ｃf ）から指紋
パターンが得られる。誘電体２５（ＳｉＮ：０．５μｍ
厚）と誘電体２３（燐ガラス膜：１μｍ厚）を使用して
機械的・化学的強度を高くすると同時に指紋隆線部２７
が接触した容量セル２１のＣf ／Ｃp （Ｃp ：迷容量）
が高くなり、指紋の像のコントラストを高めている。２
２は下部誘電体を示し、２６はＳｉオンチップ回路への
電気配線を示し、２８は指２の指紋凹部を示している。As shown in FIG. 6, this detector is composed of 300 × 300 capacitor cells 21 each having a cell size of 50 μm arranged on the Si substrate 20 in an array. Touching 21 gives a fingerprint pattern from the capacitance (C f ) between the metal sensor plate 24 and the human finger 2 in the cell. Dielectric 25 (SiN: 0.5 μm
Thickness) and a dielectric 23 (phosphor glass film: 1 μm thick) to increase the mechanical and chemical strength,
C f / C p (C p : stray capacity) of the capacity cell 21 contacted by
To increase the contrast of the fingerprint image. 2
Reference numeral 2 denotes a lower dielectric, 26 denotes electric wiring to a Si on-chip circuit, and 28 denotes a fingerprint recess of the finger 2.
【０００６】特開平９−２５９２７２号公報には、生体
情報をも加味した指紋照合方法が提案されている。Japanese Unexamined Patent Publication No. 9-259272 proposes a fingerprint collation method that also takes into account biological information.
【０００７】この指紋照合方法を、本物の指紋を示す図
７及び疑似指紋を示す図８を参照して説明する。この指
紋照合方法では、生体情報として、白い領域として表わ
されている指紋隆線部３１に存在する汗腺３２を利用す
ることにより、擬似指紋（図８）と本物の指紋（図７）
を識別している。図７において、３０は黒線として表わ
されている指紋凹部である。指紋を撮像した画像信号を
２値化して、黒画素により指紋凹部（谷線）３０を示
し、白画素により指紋隆線部３１を示す１画面分の指紋
画面の黒画素を検出する。この黒画素の連続性を識別し
連続画素数が第１のしきい値以下か否かを判定し、第１
のしきい値以下の時に谷線ではなく、隆線に存在する汗
腺と判定する。この汗腺を１画面に渡って数え、その数
が第２のしきい値以上か否かを判定し、第２のしきい値
以上であれば本物の指紋と判定する。汗腺の数が、第２
のしきい値以上でない時は擬似指紋と判定する。This fingerprint matching method will be described with reference to FIG. 7 showing a real fingerprint and FIG. 8 showing a pseudo fingerprint. In this fingerprint collation method, a pseudo fingerprint (FIG. 8) and a real fingerprint (FIG. 7) are used by using a sweat gland 32 present in a fingerprint ridge portion 31 represented as a white area as biometric information.
Has been identified. In FIG. 7, reference numeral 30 denotes a fingerprint concave portion represented as a black line. The image signal obtained by capturing the fingerprint is binarized, and a black pixel indicates a fingerprint concave portion (valley line) 30 and a white pixel indicates a fingerprint ridge portion 31 and a black pixel of one fingerprint screen is detected. The continuity of the black pixels is identified, and it is determined whether or not the number of continuous pixels is equal to or less than a first threshold.
Is determined to be a sweat gland present not in a valley line but in a ridge line. The sweat glands are counted over one screen, and it is determined whether or not the number is equal to or greater than a second threshold. If the number is equal to or greater than the second threshold, it is determined that the fingerprint is a real fingerprint. The number of sweat glands is second
If it is not equal to or greater than the threshold value, the fingerprint is determined as a pseudo fingerprint.
【０００８】生体情報として体温を利用したものも最近
Thomson-CSF 社から公表されている（特開平１０−９１
７６９号公報参照）。センサは焦電型赤外センサで画素
サイズ５０μｍの３０×２８０個の画素のアレイセンサ
であり、表面は強い保護膜で覆われている。センサは人
間の指２より小さいため指紋４０を検出する際、図９の
ように指２をセンサ表面に接触させながら方向Ｖで移動
させることにより、画素に接触した指紋の隆線部の温度
を焦電型センサに伝達させ、ｔ０、ｔ１、…、ｔｎの瞬
間にＩ０、Ｉ１、…、Ｉｎという指紋の赤外分割画像を
得る。それらを合成することによって、図１０に示すよ
うな指紋の画像を得ることができる。この方法では、図
５と異なり、光源も光学系も不要であるため、システム
が簡単になる。[0008] Recently, information using body temperature as biological information is also available.
Published by Thomson-CSF (Japanese Patent Laid-Open No. 10-91)
No. 769). The sensor is a pyroelectric infrared sensor which is an array sensor of 30 × 280 pixels with a pixel size of 50 μm, and the surface is covered with a strong protective film. Since the sensor is smaller than the human finger 2, when detecting the fingerprint 40, the finger 2 is moved in the direction V while making contact with the sensor surface as shown in FIG. Transmitted to the pyroelectric sensor, and at the instants of t0, t1,..., Tn, infrared split images of fingerprints I0, I1,. By combining them, a fingerprint image as shown in FIG. 10 can be obtained. In this method, unlike FIG. 5, neither a light source nor an optical system is required, so that the system is simplified.
【０００９】[0009]
【発明が解決しようとする課題】しかし、図５及び図６
の場合、指紋のパターンを検出することはできるが、生
体情報を利用していないため、指紋が本物か擬似指紋か
を区別することができない。図６のLucent Technologie
s Bell Laboratories の例の場合、チップの端に熱電対
を作り込んで指紋の体温を検出することにより生体情報
を得ることも考えられる。しかし３００×３００個の容
量センサのアレイの外側の領域に熱電対を作り込まない
といけないので、指が常に熱電対上にきちんと置かれる
とは限らない。また図６のデバイスは圧力にも敏感なた
め、指をデバイスに強く押し当てるとうまく指紋パタ−
ンを取得することができないことがある。However, FIG. 5 and FIG.
In the case of, the fingerprint pattern can be detected, but since the biometric information is not used, it is not possible to distinguish whether the fingerprint is a real fingerprint or a pseudo fingerprint. Lucent Technologie in Figure 6
In the case of s Bell Laboratories, for example, a thermocouple could be created at the end of the chip to detect biometric information by detecting the temperature of the fingerprint. However, because the thermocouple must be built into the area outside the array of 300 × 300 capacitive sensors, the finger is not always placed properly on the thermocouple. In addition, since the device of FIG. 6 is sensitive to pressure, when a finger is strongly pressed against the device, a fingerprint pattern is effectively obtained.
May not be available.
【００１０】図７に示すように、光学的に取得した指紋
パターン以外に汗腺の分布を生体情報として用いるのは
効果が大きいと考えられる。しかし他の簡単な手段で汗
腺以外の生体情報（例えば温度分布）も取得できれば、
本物の指紋と擬似指紋をより厳密に区別することがで
き、指紋照合装置の入力装置として遥かに優れたものと
なる。As shown in FIG. 7, it is considered to be effective to use the distribution of sweat glands as biological information in addition to the fingerprint pattern obtained optically. However, if biological information (such as temperature distribution) other than sweat glands can be obtained by other simple means,
A real fingerprint and a pseudo-fingerprint can be more strictly distinguished from each other, which makes the input device of the fingerprint collation device much more excellent.
【００１１】図９及び図１０に示した方法の場合、生体
情報として温度分布を用いて指紋パターンを検出してお
り、かなり優れていると思われる。しかしながら指をチ
ップに接触させながら移動させるため、汗腺の検出は非
常に難しいと思われる。In the case of the method shown in FIGS. 9 and 10, the fingerprint pattern is detected using the temperature distribution as the biological information, which seems to be quite excellent. However, since the finger is moved while being in contact with the chip, it is considered to be extremely difficult to detect the sweat glands.
【００１２】それ故、本発明の課題は、体温と汗腺とい
う２つの生体情報を用いて、指紋のパターンと汗腺のパ
ターンとを同時に検出することができる方法を提供し、
本物の指紋と擬似指紋の区別を容易かつ正確に行うこと
ができるようにすることにある。[0012] Therefore, an object of the present invention is to provide a method capable of simultaneously detecting a fingerprint pattern and a sweat gland pattern using two pieces of biological information such as body temperature and sweat gland,
An object of the present invention is to enable easy and accurate distinction between a real fingerprint and a pseudo fingerprint.
【００１３】[0013]
【課題を解決するための手段】本発明によれば、指の指
紋のパターンと該指の汗腺のパターンとを、該指が熱輻
射として放射する赤外線を検出することにより、同時に
取得パターンとして取得する取得ステップを含むことを
特徴とする指紋検出方法が得られる。According to the present invention, a fingerprint pattern of a finger and a sweat gland pattern of the finger are simultaneously acquired as an acquisition pattern by detecting infrared rays emitted by the finger as heat radiation. A fingerprint detection method characterized by including an acquisition step of:
【００１４】即ち、本発明の生体情報を利用した赤外線
による指紋検出方法は、個人認証を行う際、指紋のパタ
ーンと汗腺のパターンの両方を、人間の指が熱輻射とし
て放射する赤外線を検出することにより、取得すること
を特徴とする。That is, in the fingerprint detecting method using infrared light using biological information according to the present invention, when performing personal authentication, both the fingerprint pattern and the sweat gland pattern are detected by detecting infrared light emitted by a human finger as heat radiation. In this way, the feature is obtained.
【００１５】本発明の指紋検出方法では、熱伝導率の小
さい基板に指を押し当て指紋隆線部の体温を基板に転写
する。次に赤外撮像装置で転写された温度分布を熱輻射
として検出することによって指紋のパターンと汗腺の分
布を取得する。In the fingerprint detection method of the present invention, a finger is pressed against a substrate having low thermal conductivity to transfer the body temperature of the fingerprint ridge to the substrate. Next, the temperature distribution transferred by the infrared imaging device is detected as heat radiation to obtain the fingerprint pattern and the sweat gland distribution.
【００１６】本発明のもう１つの指紋検出方法は、赤外
線を透過する基板の主面に指を押し当て、基板の反対側
の面から赤外撮像装置で指紋のパターンと汗腺の分布を
取得する。According to another fingerprint detection method of the present invention, a finger is pressed against a main surface of a substrate that transmits infrared light, and a fingerprint pattern and a distribution of sweat glands are obtained from an opposite surface of the substrate using an infrared imaging device. .
【００１７】これらの方法の利点は、指紋のパターン以
外に生体情報として体温と汗腺の分布の両方を用いるこ
とで、指紋照合入力装置としての正確さ（つまり、本物
の指紋と擬似指紋の識別能力）を向上させている。The advantage of these methods is that the use of both body temperature and the distribution of sweat glands as biometric information in addition to the fingerprint pattern enables the accuracy of the fingerprint collation input device (that is, the ability to discriminate between real fingerprints and pseudo-fingerprints). ) Has improved.
【００１８】[0018]
【発明の実施の形態】次に図面を参照して本発明の実施
例について説明する。Embodiments of the present invention will now be described with reference to the drawings.
【００１９】［第１の実施例］図１を参照して本発明の
第１の実施例による指紋検出方法を説明する。[First Embodiment] A fingerprint detection method according to a first embodiment of the present invention will be described with reference to FIG.
【００２０】この第１の実施例による指紋検出方法で
は、図１の（１）に示すように、熱伝導率の小さいガラ
ス基板１の主面に人間の指２を押し当てて指紋隆線部３
の体温をガラス基板１に転写する（熱転写法）。次に、
図１の（２）に示すように、指をガラス基板１から離し
た後に、波長10μｍ帯の赤外撮像装置５で転写された温
度分布を熱輻射として検出することによって、図２に示
すように、指紋凹部４と汗腺６のパターンを取得する。In the fingerprint detection method according to the first embodiment, as shown in FIG. 1 (1), a human finger 2 is pressed against the main surface of a glass substrate 1 having a low thermal conductivity so that a fingerprint ridge is formed. 3
Is transferred to the glass substrate 1 (thermal transfer method). next,
As shown in FIG. 1 (2), after the finger is separated from the glass substrate 1, the temperature distribution transferred by the infrared imaging device 5 in the wavelength band of 10 μm is detected as thermal radiation, and as shown in FIG. Next, a pattern of the fingerprint concave portion 4 and the sweat gland 6 is obtained.
【００２１】ガラス基板１がソーダガラスからなる場
合、熱伝導率は０．５５〜０．７５Ｗ／（ｍ・Ｋ）であ
る。ガラス基板１が鉛ガラスからなる場合、熱伝導率は
０．６Ｗ／（ｍ・Ｋ）である。又、ガラス基板１がパイ
レックスガラスからなる場合、熱伝導率は１．１Ｗ／
（ｍ・Ｋ）である。When the glass substrate 1 is made of soda glass, the thermal conductivity is 0.55 to 0.75 W / (m · K). When the glass substrate 1 is made of lead glass, the thermal conductivity is 0.6 W / (m · K). When the glass substrate 1 is made of Pyrex glass, the thermal conductivity is 1.1 W /
(MK).
【００２２】この方法では、Ｇｅのような熱伝導率が比
較的高い材料からなる基板を用いると、転写した温度分
布が周囲に伝わり指紋や汗腺のパターンがぼやけたり見
えなくなったりする。Ｇｅの熱伝導率は、６７Ｗ／（ｍ
・Ｋ）である。In this method, when a substrate made of a material having a relatively high thermal conductivity such as Ge is used, the transferred temperature distribution is transmitted to the surroundings, and the fingerprint or sweat gland pattern is blurred or invisible. The thermal conductivity of Ge is 67 W / (m
K).
【００２３】また赤外画像を取る場合、撮像装置とガラ
ス基板１の位置関係によってはガラス基板１の反射の影
響が画像に、例えば、同心円状のパターンとして、現れ
るため、ガラス基板１に指２を置く前の画像と置いた後
の画像の差分を取った方が良い。When an infrared image is taken, the influence of the reflection of the glass substrate 1 appears on the image, for example, as a concentric pattern depending on the positional relationship between the imaging device and the glass substrate 1. It is better to take the difference between the image before placing and the image after placing.
【００２４】この方法を何人かに連続して適用する場
合、正確な画像を取るという技術的観点と衛生面の観点
の両方から、前の人の指紋等で汚れたガラス基板１の主
面をきれいにしてから次の人の指をガラス基板１の主面
に接触させた方がよい。When this method is continuously applied to several persons, the principal surface of the glass substrate 1 contaminated with a fingerprint or the like of the previous person is taken into consideration from both the technical viewpoint of obtaining accurate images and the viewpoint of hygiene. It is better to bring the next person's finger into contact with the main surface of the glass substrate 1 after cleaning.
【００２５】まとめると、この第１の実施例による指紋
検出方法は、主面を有し、熱伝導率の小さい基板１を用
意するステップと、人間の指２を基板１の前記主面に押
し当てて指２を基板１の前記主面から離すことにより、
指２から基板１に指２の熱輻射を転写するステップと、
基板１に転写された指２の熱輻射の温度分布を、基板１
の前記主面から放射される赤外線を検出することによ
り、赤外画像として検出するステップとを、含み、前記
赤外画像が取得パターンとして取得されることを特徴と
する。In summary, in the fingerprint detecting method according to the first embodiment, a step of preparing a substrate 1 having a main surface and low thermal conductivity, and pressing a human finger 2 against the main surface of the substrate 1 By pressing the finger 2 away from the main surface of the substrate 1,
Transferring the thermal radiation of the finger 2 from the finger 2 to the substrate 1;
The temperature distribution of the thermal radiation of the finger 2 transferred to the substrate 1
Detecting the infrared light emitted from the main surface to detect the infrared image as an infrared image, wherein the infrared image is acquired as an acquisition pattern.
【００２６】この第１の実施例による指紋検出方法は、
更に、基板１に指２を押し当てる前に、基板１の温度分
布を、基板１から放射される赤外線を検出することによ
り、指押し当て前の赤外画像として検出するステップ
と、該指押し当て前の赤外画像画像と指２を基板１に押
し当てた後の前記赤外画像との差画像を生成するステッ
プとを、含んで、前記差画像が前記取得パターンとして
取得されるようにしても良い。The fingerprint detecting method according to the first embodiment includes:
Detecting a temperature distribution of the substrate 1 as an infrared image before the finger pressing by detecting infrared rays emitted from the substrate 1 before pressing the finger 2 against the substrate 1; Generating a difference image between the infrared image before the contact and the infrared image after the finger 2 is pressed against the substrate 1 so that the difference image is acquired as the acquisition pattern. May be.
【００２７】前記取得パターンが取得された後に、基板
１の主面を衛生上、清潔にするステップが行われても良
い。After the acquisition pattern has been acquired, a step of sanitarily cleaning the main surface of the substrate 1 may be performed.
【００２８】［第２の実施例］図３を参照して本発明の
第２の実施例による指紋検出方法を説明する。[Second Embodiment] A fingerprint detection method according to a second embodiment of the present invention will be described with reference to FIG.
【００２９】この第２の実施例による指紋検出方法は、
熱透過法であり、図３に示すように波長10μｍ帯の赤外
線を透過するＧｅ基板１´の主面に、人間の指２を押し
当てて、Ｇｅ基板１´の反対側の対向面から波長10μｍ
帯の赤外撮像装置５で指紋凹部４と汗腺６の分布（図４
に示す）を取得する。この場合、Ｇｅ基板１´に接触し
た隆線部３の体温がＧｅ基板１´に奪われて同部分の温
度が下がり赤外線強度が小さくなる。一方、指紋凹部４
の温度はＧｅ基板１´に奪われないので赤外線強度は大
きいままである。従ってこの方法だと、図４に示すよう
に、赤外画像で表示される指紋や汗腺の白黒パターンは
図２と逆になる。The fingerprint detecting method according to the second embodiment includes:
As shown in FIG. 3, a human finger 2 is pressed against a main surface of a Ge substrate 1 ′ that transmits infrared rays in a wavelength band of 10 μm as shown in FIG. 10 μm
The distribution of the fingerprint concave portion 4 and the sweat gland 6 by the infrared imaging device 5 in the band (FIG. 4)
) Is obtained. In this case, the body temperature of the ridge portion 3 in contact with the Ge substrate 1 ′ is deprived by the Ge substrate 1 ′, and the temperature of the ridge portion 3 decreases, and the infrared intensity decreases. On the other hand, fingerprint recess 4
Temperature is not deprived by the Ge substrate 1 ', so that the infrared intensity remains large. Therefore, according to this method, as shown in FIG. 4, the black and white pattern of the fingerprint or sweat gland displayed in the infrared image is opposite to that of FIG.
【００３０】この透過型の方法を何人かに連続して適用
する場合、衛生面の観点から前の人の指紋等で汚れたＧ
ｅ基板１´の主面を拭き取ってから次の人の指をＧｅ基
板１´の主面に接触させた方がよい。しかし正確な赤外
画像を取るという技術的観点からは必ずしもＧｅ基板１
´のクリーニングは必要ではない。その理由は、Ｇｅの
ような熱伝導率が比較的大きい基板を用いると、基板に
接触した指紋の隆線部分の温度が周囲にすぐ拡散してし
まい、前の人の指の温度の影響が無くなるためである。When this transmission type method is continuously applied to several persons, G points stained with a fingerprint or the like of a previous person from the viewpoint of hygiene can be obtained.
It is better to wipe the main surface of the e-substrate 1 ′ and then bring the next person's finger into contact with the main surface of the Ge substrate 1 ′. However, from the technical viewpoint of taking an accurate infrared image, the Ge substrate 1 is not always required.
No cleaning is required. The reason is that when a substrate having a relatively large thermal conductivity such as Ge is used, the temperature of the ridge portion of the fingerprint in contact with the substrate is immediately diffused to the surroundings, and the influence of the temperature of the previous person's finger is It is because it disappears.
【００３１】まとめると、この第２の実施例による指紋
検出方法は、主面と該主面に対向した対向面を有し、赤
外線を透過可能な基板１´を用意するステップと、基板
１´の前記主面に人間の指２が押し当てられた状態で、
指２の熱輻射の温度分布を、基板１´の前記対向面から
放射される赤外線を検出することにより、赤外画像とし
て検出するステップとを、含み、前記赤外画像が取得パ
ターンとして取得されることを特徴とする。In summary, in the fingerprint detection method according to the second embodiment, a step of preparing a substrate 1 ′ having a main surface and an opposing surface facing the main surface and transmitting infrared light, With the human finger 2 pressed against the main surface of
Detecting the temperature distribution of the thermal radiation of the finger 2 as an infrared image by detecting infrared radiation emitted from the facing surface of the substrate 1 ′, wherein the infrared image is acquired as an acquisition pattern. It is characterized by that.
【００３２】前記取得パターンが取得された後に、基板
１´の主面を衛生上、清潔にするステップが行われても
良い。After the acquisition pattern is acquired, a step of sanitarily cleaning the main surface of the substrate 1 'may be performed.
【００３３】[0033]
【発明の効果】以上説明したように、本発明による指紋
検出方法では、体温と汗腺という２つの生体情報を用い
て、指紋のパターンと汗腺のパターンとを同時に検出す
ることができるので、本物の指紋と擬似指紋の区別を遥
かに容易かつ正確に行うことができる。As described above, in the fingerprint detection method according to the present invention, the fingerprint pattern and the sweat gland pattern can be simultaneously detected using the two biological information of the body temperature and the sweat gland. Fingerprints and pseudo fingerprints can be distinguished much more easily and accurately.
【図１】本発明の第１の実施例による指紋検出方法（熱
転写法）を説明するための図である。FIG. 1 is a diagram for explaining a fingerprint detection method (thermal transfer method) according to a first embodiment of the present invention.
【図２】図１の指紋検出方法（熱転写法）で得られる指
紋と汗腺のパタ−ンを示した図である。FIG. 2 is a diagram showing patterns of fingerprints and sweat glands obtained by the fingerprint detection method (thermal transfer method) of FIG.
【図３】本発明の第２の実施例による指紋検出方法（熱
透過法）を説明するための図である。FIG. 3 is a diagram for explaining a fingerprint detection method (heat transmission method) according to a second embodiment of the present invention.
【図４】図３の指紋検出方法（熱透過法）で得られる指
紋と汗腺のパタ−ンを示した図である。FIG. 4 is a diagram showing fingerprints and sweat gland patterns obtained by the fingerprint detection method (heat transmission method) of FIG.
【図５】従来の指紋検出方法（可視カメラとプリズムを
用いた全反射法）を説明するための図である。FIG. 5 is a diagram for explaining a conventional fingerprint detection method (total reflection method using a visible camera and a prism).
【図６】別の従来の指紋検出方法（容量変化を利用）を
説明するための図である。FIG. 6 is a diagram for explaining another conventional fingerprint detection method (using a change in capacitance).
【図７】従来の指紋照合方法を説明するための図であ
り、本物の指紋を示す図である。FIG. 7 is a diagram for explaining a conventional fingerprint collation method, and is a diagram showing a real fingerprint.
【図８】前記従来の指紋照合方法を説明するための図で
あり、擬似指紋を示す図である。FIG. 8 is a diagram for explaining the conventional fingerprint matching method, and is a diagram showing a pseudo fingerprint.
【図９】更に別の従来の指紋検出方法を説明するための
図である。FIG. 9 is a diagram for explaining still another conventional fingerprint detection method.
【図１０】前記更に別の従来の指紋検出方法を説明する
ための図である。FIG. 10 is a diagram for explaining another conventional fingerprint detection method.
１ ガラス基板 １´ Ｇｅ基板 ２ 指 ３ 指紋隆線部 ４ 指紋凹部 ５ 赤外撮像装置 ６ 汗腺 １０ 光源 １１ プリズム斜面 １２ 可視カメラ １３ 指紋凹部 １４ 指紋凸部 ２０ Ｓｉ基板 ２１ 容量セル ２２ 下部誘電体 ２３ 誘電体 ２４ 金属センサプレ−ト ２５ 誘電体 ２６ Ｓｉオンチップ回路への電気配線 ２７ 指紋隆線部 ２８ 指紋凹部 ３０ 指紋凹部 ３１ 指紋隆線部 ３２ 汗腺 ４０ 指紋 REFERENCE SIGNS LIST 1 glass substrate 1 ′ Ge substrate 2 finger 3 fingerprint ridge 4 fingerprint recess 5 infrared imaging device 6 sweat gland 10 light source 11 prism slope 12 visible camera 13 fingerprint recess 14 fingerprint projection 20 Si substrate 21 capacity cell 22 lower dielectric 23 Dielectric 24 Metal sensor plate 25 Dielectric 26 Electrical wiring to Si on-chip circuit 27 Fingerprint ridge 28 Fingerprint recess 30 Fingerprint recess 31 Fingerprint ridge 32 Sweat gland 40 Fingerprint
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小田 直樹 東京都港区芝五丁目７番１号 日本電気株 式会社内 (72)発明者 田渕 透 東京都小平市天神町１丁目57番地 エヌイ ーシー三栄株式会社内 (72)発明者 関本 伸二 東京都小平市天神町１丁目57番地 エヌイ ーシー三栄株式会社内 Ｆターム(参考） 4C038 FF01 FF05 FG01 FG06 5B043 BA02 DA04 EA05 5B047 AA25 AB10 BA02 BB10 BC01 BC23 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoki Oda 5-7-1 Shiba, Minato-ku, Tokyo Inside NEC Corporation (72) Inventor Toru Tabuchi 1-57, Tenjincho, Kodaira-shi, Tokyo NLC Within Sanei Co., Ltd. (72) Inventor Shinji Sekimoto 1-57 Tenjin-cho, Kodaira-shi, Tokyo NFC Sanei Co., Ltd. F-term (reference) 4C038 FF01 FF05 FG01 FG06 5B043 BA02 DA04 EA05 5B047 AA25 AB10 BA02 BB10 BC01 BC23
Claims (7)
ーンとを、該指が熱輻射として放射する赤外線を検出す
ることにより、同時に取得パターンとして取得する取得
ステップを含むことを特徴とする指紋検出方法。An acquisition step of acquiring a fingerprint pattern of a finger and a sweat gland pattern of the finger as an acquisition pattern simultaneously by detecting infrared rays emitted by the finger as heat radiation. Fingerprint detection method.
て、 前記取得ステップは、 主面を有し、熱伝導率の小さい基板を用意するステップ
と、 前記指を前記基板の前記主面に押し当てて該指を前記基
板の前記主面から離すことにより、該指から前記基板に
該指の熱輻射を転写するステップと、 前記基板に転写された前記指の熱輻射の温度分布を、該
基板の前記主面から放射される赤外線を検出することに
より、赤外画像として検出するステップとを、含み、 前記赤外画像が前記取得パターンとして取得されること
を特徴とする指紋検出方法。2. The fingerprint detection method according to claim 1, wherein the obtaining step includes a step of preparing a substrate having a main surface and a low thermal conductivity; and pressing the finger against the main surface of the substrate. Transferring the finger's thermal radiation from the finger to the substrate by contacting and separating the finger from the main surface of the substrate; and distributing the temperature distribution of the thermal radiation of the finger transferred to the substrate, Detecting the infrared radiation emitted from the main surface of the substrate as an infrared image, wherein the infrared image is acquired as the acquisition pattern.
て、 前記取得ステップによって前記取得パターンが取得され
た後、前記基板の前記主面を衛生上、清潔にするステッ
プを更に含むことを特徴とする指紋検出方法。3. The fingerprint detection method according to claim 2, further comprising, after the acquisition pattern is acquired by the acquisition step, a step of sanitizing and cleaning the main surface of the substrate. Fingerprint detection method.
て、 前記取得ステップは、 前記基板に前記指を押し当てる前に、該基板の温度分布
を、該基板から放射される赤外線を検出することによ
り、指押し当て前の赤外画像として検出するステップ
と、 該指押し当て前の赤外画像画像と前記指を前記基板に押
し当てた後の前記赤外画像との差画像を生成するステッ
プとを、更に含み、 前記差画像が前記取得パターンとして取得されることを
特徴とする指紋検出方法。4. The fingerprint detection method according to claim 2, wherein the acquiring step includes detecting a temperature distribution of the substrate and infrared rays emitted from the substrate before pressing the finger on the substrate. Detecting as an infrared image before finger pressing; and generating a difference image between the infrared image before finger pressing and the infrared image after pressing the finger against the substrate. And a fingerprint detection method, wherein the difference image is acquired as the acquisition pattern.
て、 前記取得ステップによって前記取得パターンが取得され
た後、前記基板の前記主面を衛生上、清潔にするステッ
プを更に含むことを特徴とする指紋検出方法。5. The fingerprint detection method according to claim 4, further comprising, after the acquisition pattern is acquired by the acquisition step, a step of sanitarily cleaning the main surface of the substrate. Fingerprint detection method.
て、 前記取得ステップは、 主面と該主面に対向した対向面を有し、前記赤外線を透
過可能な基板を用意するステップと、 前記基板の前記主面に前記指が押し当てられた状態で、
該指の熱輻射の温度分布を、前記基板の前記対向面から
放射される赤外線を検出することにより、赤外画像とし
て検出するステップとを、含み、 前記赤外画像が前記取得パターンとして取得されること
を特徴とする指紋検出方法。6. The fingerprint detection method according to claim 1, wherein the obtaining step includes a step of preparing a substrate having a main surface and a surface facing the main surface, the substrate being capable of transmitting the infrared rays. In a state where the finger is pressed against the main surface of the substrate,
Detecting the temperature distribution of the thermal radiation of the finger as an infrared image by detecting infrared radiation emitted from the facing surface of the substrate, wherein the infrared image is acquired as the acquisition pattern. A fingerprint detection method.
て、 前記取得ステップによって前記取得パターンが取得され
た後、前記基板の前記主面を衛生上、清潔にするステッ
プを更に含むことを特徴とする指紋検出方法。7. The fingerprint detection method according to claim 6, further comprising, after the acquisition pattern is acquired by the acquisition step, a step of sanitarily cleaning the main surface of the substrate. Fingerprint detection method.
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|---|---|---|---|
| JP11007279A JP3138694B2 (en) | 1999-01-14 | 1999-01-14 | Fingerprint detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11007279A JP3138694B2 (en) | 1999-01-14 | 1999-01-14 | Fingerprint detection method |
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|---|---|
| JP2000201907A true JP2000201907A (en) | 2000-07-25 |
| JP3138694B2 JP3138694B2 (en) | 2001-02-26 |
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|---|---|---|---|
| JP11007279A Expired - Fee Related JP3138694B2 (en) | 1999-01-14 | 1999-01-14 | Fingerprint detection method |
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