JPS6274177A - Uneven surface information detecting method - Google Patents
Uneven surface information detecting methodInfo
- Publication number
- JPS6274177A JPS6274177A JP60212571A JP21257185A JPS6274177A JP S6274177 A JPS6274177 A JP S6274177A JP 60212571 A JP60212571 A JP 60212571A JP 21257185 A JP21257185 A JP 21257185A JP S6274177 A JPS6274177 A JP S6274177A
- Authority
- JP
- Japan
- Prior art keywords
- hologram
- uneven surface
- light
- detector
- surface information
- 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.)
- Granted
Links
Landscapes
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Holo Graphy (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Collating Specific Patterns (AREA)
- Image Input (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
凹凸面情報検出方法であって、透明平板に圧接した凹凸
ある被検体で散乱された光を直接ホログラムに導き、ホ
ログラムのブラッグ条件を満たす凸部情報光を検知器に
て検知することにより無歪でコントラストの良い像を得
ることができる。[Detailed Description of the Invention] [Summary] A method for detecting information on an uneven surface, in which light scattered by an uneven object pressed against a transparent flat plate is guided directly to a hologram, and convex information light that satisfies the Bragg condition of the hologram is obtained. By detecting this with a detector, it is possible to obtain a distortion-free image with good contrast.
本発明は、指紋等を検出する凹凸面情報検出方法に関す
るもので、さらに詳しく言えば、歪が無く、且つコント
ラストの良い像が得られる凹凸面情報検出方法に関する
ものである。The present invention relates to a method for detecting information on an uneven surface for detecting fingerprints, etc., and more specifically, to a method for detecting information on an uneven surface that is free from distortion and provides an image with good contrast.
最近、高度情報化社会の進展に伴い情報処理システムの
セキュリティに関する諸技術が発達している。例えばコ
ンピュータルームへの入室管理に、従来の■Ｄカードに
代って指紋などを利用した個人照合システムが導入され
始めている。Recently, various technologies related to the security of information processing systems have been developed with the development of a highly information-oriented society. For example, personal verification systems using fingerprints, etc., are beginning to be introduced to control entry into computer rooms, instead of the conventional ■D card.
指紋などの個人情報入力手段としては、従来第３図に示
すような全反射フィルタリング法を用いた凹凸面情報検
出装置が開発されている。これは透明平板１、光源２、
ホログラム３、検知器４等から構成されており、その作
用は、透明平板ｌの下方より、該透明平板１に押圧され
た指５を光源２により照明すると、指５の指紋の凹部６
で散乱された光７は空気層を通るため透明平板１内では
全反射条件とならず全部外部へ出射してしまう。As a means for inputting personal information such as fingerprints, an uneven surface information detection device using a total internal reflection filtering method as shown in FIG. 3 has been developed. This consists of a transparent flat plate 1, a light source 2,
It is composed of a hologram 3, a detector 4, etc., and its action is such that when the finger 5 pressed against the transparent flat plate 1 is illuminated by the light source 2 from below the transparent flat plate 1, a concave area 6 of the fingerprint of the finger 5 is illuminated.
Since the light 7 scattered by the transparent plate 1 passes through the air layer, total reflection conditions are not met within the transparent flat plate 1, and all of the light 7 is emitted to the outside.
一方、指紋の凸部８から乱反射した光のうち全没１・１
条件で反射した光９は透明平板１内を全反射を繰返して
右方に伝播し、透明平板１の右端ζ、＝設置、Ｊられた
ボログラム３で全反射条件を崩されて夕１部へ出射する
。この光を検知器４か受＆Ｊ即時に指紋を検出すること
ができるようになっている。（特願昭６０−４１４３７
号公報参照）
〔発明が解決しようとする問題点〕
上記従来の全反射フィルタ＋月／グ法による凹凸面情報
の検出方法では、ホログラ１、の作成波面と再生波面の
違いによる非点収差が発生し、像がクリアでないという
欠点があった。On the other hand, out of the light diffusely reflected from the convex part 8 of the fingerprint, the total immersion 1.1
The light 9 reflected under the condition repeats total reflection within the transparent flat plate 1 and propagates to the right, and the total reflection condition is broken by the bologram 3 placed at the right end of the transparent flat plate 1, ζ, = installed, to the evening part. Emits light. The detector 4 receives this light and can immediately detect the fingerprint. (Patent application 1986-41437
(Refer to the publication) [Problems to be solved by the invention] In the conventional method for detecting uneven surface information using the total internal reflection filter + moon/g method, astigmatism due to the difference between the created wavefront and the reproduced wavefront of the hologram 1 is caused. The problem was that the image was not clear.
本発明はこのような点に鑑ので創作されたもので、簡易
な構成で収差及び歪の少ない像が得られる凹凸面情報検
出方法を提（ｉｔすることを目的とし７ている。The present invention was created in view of the above points, and an object of the present invention is to provide a method for detecting information on an uneven surface that has a simple configuration and can obtain an image with less aberration and distortion.
、二のため本発明においては、透明平板１０と、光源１
１と、十ログモ７ノ、１２と、検知器１３を備えた凹凸
面情報検出装置を用い、透明Ｖ、扱１０１こ圧接した凹
凸よ）る被検体１４により散乱された光を直接ホＣｌグ
ラム１２に導き、ホログラムのブラッグ条イ／１を満す
凸部情報光を検知器１３に導き、四部からの光と凸部か
らの他の光は検知器１３に導かないようにして凹凸面情
報を得ることを特徴としている。, In the present invention, the transparent flat plate 10 and the light source 1
Using an uneven surface information detection device equipped with 1, 12 and 12, and a detector 13, we directly detect the light scattered by the object 14 that is pressed against the surface of the transparent V. 12, and the convex information light that satisfies Bragg stripe I/1 of the hologram is guided to the detector 13, and the light from the four parts and the other light from the convex parts are not guided to the detector 13 to obtain uneven surface information. It is characterized by obtaining.
ホログラム再生時の被栓体とホログラムの距離を近すげ
ることで、ホログラムの作成波面と再Ｌ［波面の違いに
よる収差、及び像の縦横比の違い４減少せしめることが
可能となる。By reducing the distance between the plugged body and the hologram during hologram reproduction, it is possible to reduce the hologram's creation wavefront and re-L [aberrations due to differences in wavefronts and differences in image aspect ratio by 4].
第１図は本発明の詳細な説明するだめの図である。 FIG. 1 is a detailed illustration of the present invention.
本実施例に用いる装置は、透明平板１０、光源１１、ボ
ログラム１２、検知器１３を具備することば第３図で説
明した従来例と同様であり、本実施例の要点は、指等の
被検体１４の凸部１５からの反射光のうちブラッグ条件
を満す）ｌＴｈ ｌ ６を直接ホログラム１２に導き検
知器１３で検知するようにしたことである。The apparatus used in this embodiment is the same as the conventional example explained in FIG. Of the reflected light from the convex portions 15 of 14, lTh l 6 (which satisfies the Bragg condition) is directly guided to the hologram 12 and detected by the detector 13.
第２図は本実施例の光路長と（（Ｉられる像の縦横比及
び非点隔差の関係を求め図示したものである。FIG. 2 shows the relationship between the optical path length, image aspect ratio, and astigmatism difference in this embodiment.
同図において横軸には光路長を、左りの縦軸には縦横比
を、右方の縦軸には非点隔差をそれぞれ吉り、曲線Ａ
６．二より縦横比を、曲線Ｂにより非点隔差を示した。In the figure, the horizontal axis represents the optical path length, the vertical axis on the left represents the aspect ratio, and the vertical axis on the right represents the astigmatism difference.
6. 2 shows the aspect ratio, and curve B shows the astigmatism difference.
図より非点隔差は光路長が短かくなる程良い。As shown in the figure, the shorter the optical path length, the better the astigmatism difference.
また図中に承した点線は縦横比誤差の許容範囲を表わす
が、許容値を５％とすれば、光路長は２７ｍ１以下が良
いごとがわかる。Furthermore, the dotted line in the figure represents the permissible range of the aspect ratio error, and it can be seen that if the permissible value is 5%, the optical path length should be 27 m1 or less.
以上のように構成された本実施例は第１図に示すように
被検体１４の凸部１５からの光のうち、ブラッグ条件を
満すもの１６がホログラノ、１２で回折され■のように
検知器１３に到達する。しかし被検体１４の凹部１７か
らの光１８は、すべてブラッグ条件を満たさないためほ
とんどがスネルの法則で０のように空気層−１透過する
。また一部はＯのように回折されるが非ブラッグのため
微弱で別の方向にそれてしまう。従って凸部情報光のみ
が検知され指紋像が得られる。In this embodiment configured as described above, as shown in FIG. 1, out of the light from the convex portion 15 of the subject 14, light 16 that satisfies the Bragg condition is diffracted by the hologram 12 and detected as shown in It reaches vessel 13. However, since all of the light 18 from the recess 17 of the subject 14 does not satisfy the Bragg condition, most of the light 18 passes through the air layer -1 as 0 according to Snell's law. Also, some of it is diffracted like O, but because it is non-Bragg, it is weak and deviates in a different direction. Therefore, only the convex information light is detected and a fingerprint image is obtained.
なお第３図で説明した従来の全反射フィルタリング法に
より光路長を１７１１１前後にとった場合は、被検体か
らの散乱光のうちの利用角度を４５°にとり、−回全反
射を行なわせて四部と凸部の弁別を行なうとすると、透
明平板の厚さは６龍程度となり検出した像と実際の被検
体とが重なってし７まい像を得ることが不可能である。In addition, when the optical path length is set to around 17111 by the conventional total reflection filtering method explained in Fig. 3, the utilization angle of the scattered light from the object is set to 45 degrees, and -times total reflection is performed to divide the light into four parts. In order to discriminate between convex portions, the thickness of the transparent flat plate would be approximately 6 mm, and the detected image would overlap with the actual object, making it impossible to obtain 7 images.
以上述べてきたように、本発明によれば極めて簡易な方
法で、従来法に比べて非点隔差が少ないため鮮明な像が
得られ、且つ得られた像に歪がないため補正を行なう必
要がなく照合にも負担がかからないという利点があり、
実用−Ｌ極めて有用である。As described above, according to the present invention, a clear image can be obtained using an extremely simple method with less astigmatism difference than the conventional method, and there is no need for correction because the obtained image is free from distortion. The advantage is that there is no burden on verification.
Practical-L Extremely useful.
第１図は本発明の詳細な説明するための図、第２図は光
路長と得られた像の縦横比及び非点隔差の関係を示す図
、
第３図は従来の凹凸面情報検出装置を示す図である。
第１図において、
１０は透明平板、
１］は光源、
１２はホログラム、
１３は検知器、
１４は被検体である。
本発明の詳細な説明するための同
第１図
１０・・・透明平板
１１・・・光源
１２・・・ホログラム
１３・・・検知器
１４・・・被検体
光路長と得られた像の縦横比及
び非点隔差の関係を示す図
第２図
従来の凹凸面情報検出装置を示す同
第３図
１・・・透明平板
２・・・光源
３・・・ ホログラム
４・・・検知器
５・・・指
６・・・指紋の四部
７・・・凹部からの反射光
８・・・指紋の凸部
９・・・凸部からの反射光Fig. 1 is a diagram for explaining the present invention in detail, Fig. 2 is a diagram showing the relationship between the optical path length, the aspect ratio of the obtained image, and the astigmatism difference, and Fig. 3 is a conventional uneven surface information detection device. FIG. In FIG. 1, 10 is a transparent flat plate, 1] is a light source, 12 is a hologram, 13 is a detector, and 14 is a subject. 10...Transparent flat plate 11...Light source 12...Hologram 13...Detector 14...Object optical path length and length and width of obtained image Figure 2 shows the relationship between the ratio and astigmatism difference. Figure 3 shows the conventional uneven surface information detection device.1... Transparent flat plate 2... Light source 3... Hologram 4... Detector 5... ...Finger 6...Four parts of the fingerprint 7...Reflected light from the recesses 8...Protrusions of the fingerprint 9...Reflected light from the protrusions
Claims (1)
（１２）と、検知器（１３）を備えた凹凸面情報検出装
置を用い、透明平板（１０）に圧接した凹凸ある被検体
（１４）により散乱された光を直接ホログラム（１２）
に導き、ホログラムのブラッグ条件を満す凸部情報光を
検知器（１３）に導き、凹部からの光と凸部からの他の
光は検知器（１３）に導かないようにして凹凸面情報を
得ることを特徴とする凹凸面情報検出方法。1. Using an uneven surface information detection device equipped with a transparent flat plate (10), a light source (11), a hologram (12), and a detector (13), an uneven object ( 14) The light scattered by the hologram (12)
The convex information light that satisfies the Bragg condition of the hologram is guided to the detector (13), and the light from the concave part and other light from the convex part are not guided to the detector (13) to obtain the uneven surface information. A method for detecting uneven surface information, characterized in that:
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60212571A JPS6274177A (en) | 1985-09-27 | 1985-09-27 | Uneven surface information detecting method |
| US06/833,276 US4728186A (en) | 1985-03-03 | 1986-02-27 | Uneven-surface data detection apparatus |
| DE8686301434T DE3688339T2 (en) | 1985-03-03 | 1986-02-28 | DEVICE FOR DETERMINING DATA OF LEVEL SURFACES. |
| CA000503027A CA1246179A (en) | 1985-03-03 | 1986-02-28 | Uneven-surface data detection apparatus |
| FI860862A FI88752C (en) | 1985-03-03 | 1986-02-28 | Datadetektionsapparat Foer en ojaemn yta och personidentifieringssystem |
| EP86301434A EP0194783B1 (en) | 1985-03-03 | 1986-02-28 | Uneven-surface data detection apparatus |
| KR1019860001470A KR900006061B1 (en) | 1985-03-03 | 1986-03-03 | Uneuen-surface data detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60212571A JPS6274177A (en) | 1985-09-27 | 1985-09-27 | Uneven surface information detecting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6274177A true JPS6274177A (en) | 1987-04-04 |
| JPH0252310B2 JPH0252310B2 (en) | 1990-11-13 |
Family
ID=16624901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60212571A Granted JPS6274177A (en) | 1985-03-03 | 1985-09-27 | Uneven surface information detecting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6274177A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6437934A (en) * | 1987-08-04 | 1989-02-08 | Meteoola Syst Kk | Fingerprint detector |
| US6324020B1 (en) * | 1999-08-04 | 2001-11-27 | Secugen Corporation | Method and apparatus for reduction of trapezoidal distortion and improvement of image sharpness in an optical image capturing system |
| US6381347B1 (en) | 1998-11-12 | 2002-04-30 | Secugen | High contrast, low distortion optical acquistion system for image capturing |
-
1985
- 1985-09-27 JP JP60212571A patent/JPS6274177A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6437934A (en) * | 1987-08-04 | 1989-02-08 | Meteoola Syst Kk | Fingerprint detector |
| US6381347B1 (en) | 1998-11-12 | 2002-04-30 | Secugen | High contrast, low distortion optical acquistion system for image capturing |
| US6324020B1 (en) * | 1999-08-04 | 2001-11-27 | Secugen Corporation | Method and apparatus for reduction of trapezoidal distortion and improvement of image sharpness in an optical image capturing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0252310B2 (en) | 1990-11-13 |
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