JPH0745802Y2 - Image recognition device - Google Patents
Image recognition deviceInfo
- Publication number
- JPH0745802Y2 JPH0745802Y2 JP1990081026U JP8102690U JPH0745802Y2 JP H0745802 Y2 JPH0745802 Y2 JP H0745802Y2 JP 1990081026 U JP1990081026 U JP 1990081026U JP 8102690 U JP8102690 U JP 8102690U JP H0745802 Y2 JPH0745802 Y2 JP H0745802Y2
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- JP
- Japan
- Prior art keywords
- light
- reflecting surface
- light sources
- image recognition
- recognition device
- 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.)
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- Facsimile Scanning Arrangements (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は、画像認識装置に関するもので、特にその対象
物に対する照明部の構成に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an image recognition device, and more particularly to a configuration of an illumination unit for an object thereof.
（従来の技術） 照明光を対象物に向かって照射し、対象物からの反射光
を検出して対象物を認識する画像認識装置が、例えば、
銀行における通帳の認識装置や、工場における各種ワー
クの認識装置等として広く用いられている。(Prior Art) An image recognition device that illuminates an object toward an object and detects reflected light from the object to recognize the object is, for example,
It is widely used as a passbook recognition device in banks and various work recognition devices in factories.
このような画像認識装置では、認識の精度を向上させる
ために、対象物を均一に照明する必要がある。そこで、
光源を複数個並べると共に、光源からの照明光を反射板
で反射させて対象物に照射することが考えられている。
第６図はその例を示す。In such an image recognition device, it is necessary to uniformly illuminate the object in order to improve the recognition accuracy. Therefore,
It is considered that a plurality of light sources are arranged and the illumination light from the light sources is reflected by a reflector to illuminate the object.
FIG. 6 shows an example.
第６図において、符合14は通帳などの画像認識の対象物
であり、この対象物14は適宜の走行ガイドに沿って左右
方向に走行するようになっている。対象物14の走行方向
前後の下方には、光源11と反射板12でなる照明部が配置
されている。光源11は複数個のLEDなどでなり、この複
数個の光源11が対象物14の走行方向に直交する方向に配
列されている。反射板12は、上記複数個の光源11からの
照明光を対象物14に導くことができるように光源11の配
列方向に長く形成されており、また、対象物14側の縁部
が内側に向かって斜めに折り曲げられて折曲部13が形成
されている。光源11から出射した照明光は反射板12の本
体部分および折曲縁部13で反射され、対象物14をその走
行方向に対し直交する方向に線状に照明する。In FIG. 6, reference numeral 14 is an object for image recognition such as a passbook, and this object 14 is adapted to travel in the left-right direction along an appropriate travel guide. An illumination unit including a light source 11 and a reflection plate 12 is arranged below the front and rear of the object 14 in the traveling direction. The light source 11 is composed of a plurality of LEDs and the like, and the plurality of light sources 11 are arranged in a direction orthogonal to the traveling direction of the object 14. The reflection plate 12 is formed long in the arrangement direction of the light sources 11 so that the illumination light from the plurality of light sources 11 can be guided to the object 14, and the edge portion on the object 14 side is inward. A bent portion 13 is formed by being bent obliquely toward the side. Illumination light emitted from the light source 11 is reflected by the main body portion of the reflection plate 12 and the bent edge portion 13, and linearly illuminates the object 14 in a direction orthogonal to the traveling direction thereof.
対象物14の下方には結像レンズとセンサが配置され、結
像レンズが対象物14の表面の画像を上記センサの面に結
像させるようになっている。対象物14は通帳のようにあ
る程度幅の大きいものであり、センサは対象物14の幅方
向に多数の微小な素子を配列したCCDセンサアレイ等で
なる。走行ガイドに沿って対象物14をセンサアレイに直
交する方向に走行させながらセンサの出力を１ラインず
つ取り込むことにより、対象物14の画像情報を得ること
ができる。An image forming lens and a sensor are arranged below the object 14, and the image forming lens forms an image of the surface of the object 14 on the surface of the sensor. The object 14 has a certain width like a passbook, and the sensor is a CCD sensor array or the like in which a large number of minute elements are arranged in the width direction of the object 14. The image information of the target object 14 can be obtained by capturing the output of the sensor line by line while the target object 14 is running in the direction orthogonal to the sensor array along the running guide.
本出願人の出願にかかる特願平２−154183号（特公平６
−80512号）の発明は、以上説明した技術に関連する。Japanese Patent Application No. 2-154183 (Japanese Patent Application No.
The invention of No. -80512) is related to the technology described above.
（考案が解決しようとする課題） 以上説明した従来考えられている画像認識装置の照明部
によれば、反射板12の反射面が平面になっている。その
ため、複数個のLED等でなる光源から出射した照明光が
対象物14に均一に照射されず、照明むらを生じる。第７
図は上記画像認識装置の照明部の特性を示すもので、曲
線16は各光源11からの照明光の指向特性、曲線17は対象
物面上での光量分布を示す。この図から明らかなとお
り、光源11の光軸上での光量と光軸と光軸との中間部で
の光量に大きな差があり、照明むらが大きくなってい
る。照明むらが大きくなると、センサが対象物の画像を
忠実に検出することができず、画像認識の精度が低下す
る。(Problems to be Solved by the Invention) According to the illumination section of the conventional image recognition apparatus described above, the reflecting surface of the reflecting plate 12 is a flat surface. Therefore, the illumination light emitted from the light source including a plurality of LEDs or the like is not uniformly applied to the target object 14, and uneven illumination occurs. 7th
The figure shows the characteristics of the illumination unit of the image recognition apparatus, and the curve 16 shows the directional characteristic of the illumination light from each light source 11, and the curve 17 shows the light amount distribution on the object surface. As is clear from this figure, there is a large difference between the amount of light on the optical axis of the light source 11 and the amount of light at the intermediate portion between the optical axes, and illumination unevenness is large. If the illumination unevenness becomes large, the sensor cannot faithfully detect the image of the target object, and the accuracy of image recognition deteriorates.
本考案は、かかる従来技術の問題点を解消するためにな
されたもので、反射板の形状を工夫することによって、
対象物上での光量分布を均一化し、もって、画像認識の
精度を向上させることができる画像認識装置を提供する
ことを目的とする。The present invention was made in order to solve the problems of the prior art, and by devising the shape of the reflector,
An object of the present invention is to provide an image recognition device that can make the light amount distribution on the object uniform and thus improve the accuracy of image recognition.
（課題を解決するための手段） 本考案は、複数個並べた光源からの照射光を反射板を介
して対象物に線状に照射し、対象物からの反射光を検出
手段に入射して対象物を認識する装置において、上記反
射板に、光源の間隔と等しいかまたはこれよりも狭いピ
ッチの凹凸状の反射面を形成し、この反射面の凹凸で形
成される稜の方向を光軸方向としたことを特徴とする。(Means for Solving the Problems) The present invention linearly irradiates irradiation light from a plurality of arranged light sources to a target through a reflector, and makes the reflected light from the target incident on a detection means. In a device for recognizing an object, an uneven reflecting surface having a pitch equal to or narrower than the distance between light sources is formed on the reflecting plate, and the direction of the ridge formed by the unevenness of the reflecting surface is the optical axis. It is characterized by the direction.
（作用） 各光源から出た照明光は指向特性を有しているが、この
照明光が反射板の凹凸状の反射面で反射されることによ
り、照明光の向きが少なくとも２方向に分割される。上
記凹凸状の反射面のピッチは光源の間隔と等しいかまた
はこれよりも狭いピッチになっており、また、上記反射
面の凹凸で形成される稜の方向が光軸方向になっている
ため、照明光の指向特性のピークが光源の間隔の1/2以
下のピッチで現れ、光軸上の光量と、光軸と光軸の中間
部の光量の差が小さくなる。(Operation) Although the illumination light emitted from each light source has a directional characteristic, the illumination light is reflected by the concave-convex reflecting surface of the reflector so that the illumination light is divided into at least two directions. It The pitch of the uneven reflecting surface is equal to or narrower than the interval of the light source, and since the direction of the ridge formed by the unevenness of the reflecting surface is the optical axis direction, The peak of the directional characteristic of the illumination light appears at a pitch of 1/2 or less of the distance between the light sources, and the difference between the light amount on the optical axis and the light amount between the optical axis and the intermediate portion between the optical axes becomes small.
（実施例） 以下、本考案にかかる画像認識装置の実施例について説
明する。(Embodiment) An embodiment of the image recognition apparatus according to the present invention will be described below.
第１図において、光源１は複数個のLED等でなり、各光
源１から出射した照明光は反射板２で反射されて対象物
４に照射されるようになっている。複数個の光源１は第
６図に示した従来例における光源11と同様に所定の向き
に列をなして配置されている。反射板２は、上記列をな
す複数の光源１の側方に配置されている。また、反射板
２は、下部垂直部と上部傾斜部とからなり、上部傾斜部
が大半を占めている。この上部傾斜部が主として光源１
からの照明光を反射して対象物４に導くようになってい
る。第２図ないし第４図にも示すように、反射板２の上
記上部傾斜部には、凹凸状の反射面３が形成されてい
る。この凹凸状の反射面３は、傾きの向きが互いに異な
る面を交互に配置することによって三角波状に形成され
ている。凹凸状反射面３で形成される山側の稜を５、谷
側の稜を６としたとき、これらの稜5,6の方向が上記照
明光の光軸方向となるように形成されている。また、第
４図に示すように、複数個の光源１の配列間隔P1と上記
反射面３の凹凸のピッチP2とが等しくなっている。In FIG. 1, the light source 1 is composed of a plurality of LEDs and the like, and the illumination light emitted from each light source 1 is reflected by a reflection plate 2 to be applied to an object 4. The plurality of light sources 1 are arranged in a row in a predetermined direction like the light source 11 in the conventional example shown in FIG. The reflection plate 2 is arranged on the side of the plurality of light sources 1 forming the row. The reflector 2 is composed of a lower vertical portion and an upper inclined portion, and the upper inclined portion occupies the majority. This upper inclined portion is mainly the light source 1.
The illumination light from is reflected and guided to the object 4. As shown in FIGS. 2 to 4, a concave-convex reflecting surface 3 is formed on the upper inclined portion of the reflecting plate 2. The uneven reflecting surface 3 is formed in a triangular wave shape by alternately arranging surfaces having different inclination directions. When the ridge on the mountain side formed by the uneven reflection surface 3 is 5 and the ridge on the valley side is 6, these ridges 5 and 6 are formed so as to be the optical axis direction of the illumination light. Further, as shown in FIG. 4, the arrangement interval P 1 of the plurality of light sources 1 and the pitch P 2 of the irregularities of the reflecting surface 3 are equal.
なお、第１図には示されていないが、第６図に示した従
来例と同様に、複数の光源１と反射板２でなる一対の照
明部が対象物４の両側に配置される。また、対象物４は
適宜の走行ガイドに沿って第１図において左右方向に搬
送され、この搬送方向に対し直交する方向に複数の光源
１が上記間隔P1で配列されている。Although not shown in FIG. 1, a pair of illuminating units composed of a plurality of light sources 1 and reflectors 2 are arranged on both sides of the object 4, as in the conventional example shown in FIG. Further, the object 4 is conveyed in the left-right direction in FIG. 1 along an appropriate traveling guide, and the plurality of light sources 1 are arranged at the interval P 1 in the direction orthogonal to the conveying direction.
各光源１から出射した照明光のほとんどは、反射板２の
反射面３で反射されて対象物４に照射される。複数の光
源１は対象物４の搬送方向に対して直交方向に配列され
ているため、対象物４の面はその搬送方向に対して直交
する方向に線状に照明される。対象物４の像は前述の従
来例と同様に結像レンズを介してセンサに結ばれ、セン
サの検出出力によって対象物４の画像を認識することが
できる。Most of the illumination light emitted from each light source 1 is reflected by the reflecting surface 3 of the reflecting plate 2 and is applied to the object 4. Since the plurality of light sources 1 are arranged in a direction orthogonal to the transport direction of the object 4, the surface of the object 4 is linearly illuminated in a direction orthogonal to the transport direction. The image of the object 4 is connected to the sensor via the imaging lens as in the above-mentioned conventional example, and the image of the object 4 can be recognized by the detection output of the sensor.
なお、反射面３を形成する凹凸面の光軸方向に対する傾
斜角は、光源１から反射面３までの距離や、反射面３か
ら対象物４までの距離に応じて決定する。The inclination angle of the uneven surface forming the reflecting surface 3 with respect to the optical axis direction is determined according to the distance from the light source 1 to the reflecting surface 3 and the distance from the reflecting surface 3 to the object 4.
LED等でなる各光源１からの照明光は、第５図に指向特
性曲線８で示すように、一定方向に集中している。しか
し、この照明光が凹凸状の反射面３で反射されることに
より、照明光の向きが２方向に分割され、第５図に曲線
９で示すように、指向特性曲線に二つのピークが生じ
る。一方、上記凹凸状の反射面３のピッチP2は光源１の
間隔P1と等しいピッチになっており、また、上記反射面
３の凹凸で形成される稜5,6の方向が光軸方向になって
いるため、照明光の指向特性のピークが光源１の間隔の
1/2のピッチで現れる。従って、対象物４の面上での光
度分布曲線には、第５図に曲線10で示すように、一つの
光軸に対して二つのピークが光軸の両側に現れる。これ
を換言すれば、指向特性のピークを細分化して分散させ
たことになり、よって、光軸上の照度と、光軸と光軸の
中間部の照度の差が小さくなる。Illumination light from each light source 1 formed of an LED or the like is concentrated in a certain direction as shown by a directional characteristic curve 8 in FIG. However, when the illumination light is reflected by the uneven reflecting surface 3, the direction of the illumination light is divided into two directions, and as shown by the curve 9 in FIG. 5, two peaks occur in the directional characteristic curve. . On the other hand, the pitch P 2 of the uneven reflecting surface 3 is equal to the pitch P 1 of the light source 1, and the ridges 5 and 6 formed by the unevenness of the reflecting surface 3 are in the optical axis direction. Since the peak of the directional characteristic of the illumination light is
Appears at a pitch of 1/2. Therefore, in the light intensity distribution curve on the surface of the object 4, as shown by the curve 10 in FIG. 5, two peaks appear for one optical axis on both sides of the optical axis. In other words, the peaks of the directional characteristics are subdivided and dispersed, and thus the difference between the illuminance on the optical axis and the illuminance between the optical axis and the intermediate portion between the optical axes becomes small.
このように、上記実施例によれば、反射板２の反射面３
を凹凸状にすると共に、この凹凸状の反射面３のピッチ
を複数の光源１の間隔と等しく、かつ、上記反射面３の
凹凸で形成される稜の方向を光軸方向としたため、対象
物４の面上における照度むらが小さくなり、画像認識の
精度を高めることができる、また、上記反射面３の凹凸
で形成される稜の方向を光軸方向に揃えたため、照明光
の反射方向が特定の方向に決められることになり、照明
光の方向性が改善される効果もある。Thus, according to the above-described embodiment, the reflecting surface 3 of the reflecting plate 2 is
And the pitch of the uneven reflecting surface 3 is equal to the interval between the plurality of light sources 1, and the direction of the ridge formed by the unevenness of the reflecting surface 3 is the optical axis direction. The unevenness of illuminance on the surface of No. 4 can be reduced, and the accuracy of image recognition can be improved. Further, since the direction of the ridge formed by the irregularities of the reflecting surface 3 is aligned with the optical axis direction, the reflection direction of the illumination light is Since it is decided in a specific direction, there is also an effect that the directionality of the illumination light is improved.
以上説明した実施例では、複数の光源１の間隔P1と反射
面３の凹凸のピッチP2が等しくなっていたが、P2≦P1の
関係になっていれば差し支えない。むしろ、P2がP1より
も小さい方が光量分布のピークが細分化されるため、対
象物４の面上での照度むらがさらに小さくなるという利
点がある。このことから、反射面３の凹凸のピッチP
2は、要求される照度の均一度によって決まる。ちなみ
に、複数の光源１の間隔P1を6mmとし、反射面３の凹凸
のピッチP2を1.5mmとした場合、照度むらが10％程度に
なり、照度むらの改善効果が十分に得られた。また、上
記P1を6mmとしたとき上記P2を0.6mmとすれば、照度むら
改善効果をより大きくなる。In the embodiment described above, the interval P 1 between the plurality of light sources 1 and the pitch P 2 of the unevenness of the reflecting surface 3 are equal, but it is acceptable as long as the relationship of P 2 ≦ P 1 is satisfied. Rather, when P 2 is smaller than P 1 , the peak of the light amount distribution is subdivided, and there is an advantage that the illuminance unevenness on the surface of the object 4 is further reduced. From this, the pitch P of the unevenness of the reflecting surface 3
2 depends on the required uniformity of illuminance. By the way, when the interval P 1 between the plurality of light sources 1 is 6 mm and the pitch P 2 of the unevenness of the reflecting surface 3 is 1.5 mm, the uneven illuminance is about 10%, and the effect of improving the uneven illuminance is sufficiently obtained. . Further, when P 1 is set to 6 mm and P 2 is set to 0.6 mm, the effect of improving the uneven illuminance is further enhanced.
また、前後に対をなす複数の光源１の配置を相互に千鳥
状にすれば、照度むら改善効果がさらに大きくなる。Further, if the plurality of light sources 1 forming a pair in the front and rear are arranged in a staggered pattern, the effect of improving the uneven illuminance is further enhanced.
なお、反射板２の反射面３は必ずしも三角波状に形成す
る必要はなく、角が面取りされて滑らかに連続する波形
に形成されていてもよい。The reflecting surface 3 of the reflecting plate 2 does not necessarily have to be formed in a triangular wave shape, and may be formed in a smoothly continuous waveform with chamfered corners.
（考案の効果） 本考案によれば、複数の光源からの照度光を反射板を介
して対象物に線状に照射し、対象物からの反射光を検出
手段に入射して対象物を認識するに当たり、上記反射板
の反射面を凹凸状にすると共に、この凹凸状の反射面の
ピッチを複数の光源の間隔と等しくし、かつ、上記反射
面の凹凸で形成される稜の方向を光軸方向にしたため、
対象物の面上における光量分布のピークが細分化されて
照度むらが小さくなり、画像認識の精度を高めることが
できる。(Effect of the Invention) According to the present invention, the illuminance light from a plurality of light sources is linearly irradiated to the object through the reflector, and the reflected light from the object is incident on the detecting means to recognize the object. In doing so, the reflecting surface of the reflecting plate is made uneven, the pitch of the uneven reflecting surface is made equal to the interval of a plurality of light sources, and the direction of the ridge formed by the unevenness of the reflecting surface Because it was in the axial direction,
The peak of the light amount distribution on the surface of the object is subdivided to reduce unevenness in illuminance, and the accuracy of image recognition can be improved.
第１図は本考案にかかる画像認識装置の実施例を示す正
面図、第２図は同上実施例中の反射板の拡大断面図、第
３図は同上反射板の側面図、第４図は上記実施例におけ
る光源の配列と反射面の配置関係を示す平面図、第５図
は上記実施例における光源の指向特性および対象物面に
おける光量分布特性を示す線図、第６図は従来の画像認
識装置の例を示す断面正面図、第７図は同上従来の画像
認識装置における光源の指向特性および対象物面におけ
る光量分布特性を示す線図である。 １…光源、２…反射板、３…反射面、４…対象物。FIG. 1 is a front view showing an embodiment of an image recognition apparatus according to the present invention, FIG. 2 is an enlarged sectional view of a reflector in the same embodiment, FIG. 3 is a side view of the same reflector, and FIG. FIG. 5 is a plan view showing the arrangement relationship between the arrangement of the light sources and the reflecting surface in the above embodiment, FIG. 5 is a diagram showing the directional characteristics of the light sources and the light amount distribution characteristics in the object surface in the above embodiment, and FIG. 6 is a conventional image. FIG. 7 is a sectional front view showing an example of the recognition device, and FIG. 7 is a diagram showing the directivity characteristic of the light source and the light amount distribution characteristic on the object surface in the conventional image recognition device. 1 ... Light source, 2 ... Reflector, 3 ... Reflective surface, 4 ... Object.
Claims (1)
明光を反射板を介して対象物に線状に照射し、対象物か
らの反射光を検出手段に入射して対象物を認識する画像
認識装置において、 上記反射板は、光源の間隔と等しいかまたはこれよりも
狭いピッチの凹凸状の反射面を有し、この反射面の凹凸
で形成される稜の方向が光軸方向であることを特徴とす
る画像認識装置。1. A plurality of light sources such as LEDs are arranged, illumination light from the light sources is linearly irradiated to a target object through a reflecting plate, and the reflected light from the target object is made incident on the detection means to target the target object. In the image recognition device for recognizing, the reflector has an uneven reflecting surface having a pitch equal to or narrower than the distance between the light sources, and the direction of the ridge formed by the unevenness of the reflecting surface is the optical axis direction. An image recognition device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990081026U JPH0745802Y2 (en) | 1990-07-30 | 1990-07-30 | Image recognition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990081026U JPH0745802Y2 (en) | 1990-07-30 | 1990-07-30 | Image recognition device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0440352U JPH0440352U (en) | 1992-04-06 |
| JPH0745802Y2 true JPH0745802Y2 (en) | 1995-10-18 |
Family
ID=31626601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990081026U Expired - Fee Related JPH0745802Y2 (en) | 1990-07-30 | 1990-07-30 | Image recognition device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0745802Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014007765A (en) * | 2013-09-30 | 2014-01-16 | Ricoh Co Ltd | Image reader and image formation apparatus |
| JP6575204B2 (en) * | 2015-07-29 | 2019-09-18 | テイ・エス テック株式会社 | Light emitting device for vehicle |
| JP7140998B2 (en) * | 2021-02-10 | 2022-09-22 | テイ・エス テック株式会社 | Vehicle light emitting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5899963U (en) * | 1981-12-26 | 1983-07-07 | 株式会社リコー | Light source for document illumination |
-
1990
- 1990-07-30 JP JP1990081026U patent/JPH0745802Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0440352U (en) | 1992-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |