JPH05172762A - Judging method for cleanliness of surface of steel material - Google Patents
Judging method for cleanliness of surface of steel materialInfo
- Publication number
- JPH05172762A JPH05172762A JP3356479A JP35647991A JPH05172762A JP H05172762 A JPH05172762 A JP H05172762A JP 3356479 A JP3356479 A JP 3356479A JP 35647991 A JP35647991 A JP 35647991A JP H05172762 A JPH05172762 A JP H05172762A
- Authority
- JP
- Japan
- Prior art keywords
- image
- recognition device
- steel material
- image recognition
- image data
- 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.)
- Withdrawn
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、塗装前もしくは表面処
理前の鋼材面の清浄度を判定する方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the cleanliness of a steel surface before painting or surface treatment.
【0002】[0002]
【従来の技術】従来この種の判定方法としてはASTM
(アメリカ材料試験協会)及びSSPC(アメリカ鋼構
造塗装評議会)の協力を得てスウェーデン腐食研究所に
より作成された「塗装前鋼材表面処理基準」の規格(J
IS)がある。この規格は4種の錆等級に分類された鋼
材表面の素地品質等級をSal、Sa2、Sa21/2、
Sa3の4種に分類したカラープリントで明示した写真
見本を判定基準とし、それと鋼材面とを目視または写真
撮影して比較し、清浄度を判定するものである。2. Description of the Related Art ASTM is a conventional determination method of this type.
(Stainless Steel Structural Coatings Council) and SSPC (Stainless Steel Structural Coatings Council) have created the "Pre-painting Steel Surface Treatment Standards" standard (J
IS). According to this standard, the base material quality grades of steel materials classified into four rust grades are Sal, Sa2, Sa21 / 2,
The cleanliness is judged by visually or taking a photograph of the photograph sample clearly defined by the color print classified into four kinds of Sa3 as the criterion, and comparing it with the steel material surface.
【0003】[0003]
【発明が解決しようとする課題】しかしこの判定方法は
ある程度パターン化された写真見本との比較となるた
め、判定結果が判定者の主観によるところが大きく、同
じ清浄度の鋼材面に対して、判定者毎に判定結果が異な
ったり、天候等の環境条件や判定者の健康状態によって
判定結果が異なったりする課題があった。However, since this judgment method is to be compared with a photographic sample that is patterned to some extent, the judgment result largely depends on the subjectivity of the judge, and judgment is made for steel surfaces with the same cleanliness. There is a problem that the judgment result varies from person to person, and the judgment result varies depending on environmental conditions such as weather and the health condition of the judge.
【0004】[0004]
【課題を解決するための手段】この発明は、上記のよう
な従来の課題を除去するためになされたもので、テレビ
カメラが検出した鋼材面の画像データを画像認識装置で
あらかじめ画像認識装置に記憶させておいた判定基準画
像データと比較し、2値化画像処理し、鋼材面の清浄部
とそうでない部分を差別化し、清浄部の面積率を演算す
ることにより、一定の基準で鋼材面の清浄度を正確に判
定できるようにしたものである。SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned conventional problems, and the image data of the steel surface detected by the television camera is stored in advance in the image recognition device by the image recognition device. By comparing with the stored judgment reference image data, binarized image processing is performed, the clean part of the steel surface is differentiated from the other part, and the area ratio of the clean part is calculated. The cleanliness of the can be accurately determined.
【0005】[0005]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。図−1において、1は鋼材であって、本実施例
では表面をブラスト或いはパワーツールによってある程
度の錆落としがされている。2は1に対向配置されたテ
レビカメラ、3は2に連結された画像認識装置であっ
て、2で検出した画像データを2値化画像処理し、それ
をもとに後述の判断基準と演算を行う。4は3に連結さ
れたモニターテレビであって、3で処理した2値化画像
の映像及び演算結果を表示する。図示しないが3の画像
認識装置にはあらかじめ1の鋼材と同じ方法で完全に錆
落としした鋼材面を2値化画像処理した画像データが、
清浄度の判定基準用として記憶されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a steel material, and in this embodiment, the surface is blasted or rust removed to some extent by a power tool. Reference numeral 2 is a television camera arranged opposite to 1, reference numeral 3 is an image recognition device connected to 2, and the image data detected in 2 is subjected to binarized image processing, and based on that, judgment criteria and calculation to be described later. I do. Reference numeral 4 denotes a monitor television connected to 3, which displays the image of the binarized image processed in 3 and the calculation result. Although not shown, the image recognition device 3 has image data obtained by performing binary image processing on the steel surface completely rust-removed in advance by the same method as that of the steel 1.
It is stored as a criterion for the cleanliness.
【0006】この構成において、まず、テレビカメラ2
が測定対象の鋼材1の鋼材面を映した画像を画像認識装
置3で2値化処理しない映像をモニターテレビ4で映像
化し、ピント、明るさを調整する。同様のピント、明る
さに調整した画像認識装置3であらかじめ完全に錆落と
しした鋼材面を2値化画像処理した判定基準用の画像デ
ータを記憶させておき、この判定基準用の画像データを
用いて、上記測定対象の鋼材面を2値化画像処理し、そ
の結果をモニターテレビ4で映像化するとともに錆が残
っている面積率或いは錆落としされている面積率を演算
し、モニターテレビに表示する。上記実施例ではピン
ト、明るさを判定の度に調整しなければならないが、照
明とテレビカメラを一体化し、さらに治具によって常に
テレビカメラと鋼材面が一定距離になるようにして撮影
条件を一定に保つようにした方が好ましい。In this structure, first, the television camera 2
Displays an image of the steel surface of the steel material 1 to be measured, which is not binarized by the image recognition device 3, on the monitor television 4, and adjusts the focus and brightness. The image data for the judgment standard obtained by binarizing the steel surface completely rust removed in advance by the image recognition device 3 adjusted to the same focus and brightness is stored, and the image data for the judgment standard is used. Then, the steel surface to be measured is binarized and image-processed, and the result is visualized on the monitor TV 4, and the area ratio of remaining rust or the area ratio of rust removed is calculated and displayed on the monitor TV. To do. In the above embodiment, the focus and brightness must be adjusted each time the judgment is made, but the lighting and the TV camera are integrated, and the jig and the steel material surface are kept at a constant distance by a jig so that the shooting conditions are constant. It is preferable to keep it at.
【0007】そのようにした実施例を図−2に示す。図
−2は画像データを検出する部分のみを示したものであ
り、2は鋼材面に対向配置したテレビカメラ、5は均等
な照度を得るようにテレビカメラ2のレンズの周りに取
り付けられた照明用のリング蛍光灯、6はリング蛍光灯
5を点灯させるために5に連結された電圧を安定化した
電源、7はテレビカメラ2とリング蛍光灯5とを一体化
した円錐状あるいは角錐状のフードである。このような
構成にすることにより、テレビカメラ2と測定する鋼材
面との距離を一定に保ち、かつフード7で一定の照度で
照明できるため測定面とのテレビカメラのピント合わせ
及び照度調整が1回で済み容易化できるとともに撮影条
件を一定にできる。上記2つの実施例において測定結果
を残したい場合には画像認識装置3にビデオプリンター
を連結し、記録するようにすれば良い。An example of such an embodiment is shown in FIG. FIG. 2 shows only a portion for detecting image data, 2 is a television camera arranged facing the steel material surface, and 5 is an illumination attached around the lens of the television camera 2 so as to obtain a uniform illuminance. Ring fluorescent lamp, 6 is a power source for stabilizing the voltage connected to 5 for lighting the ring fluorescent lamp 5, and 7 is a conical or pyramidal shape in which the television camera 2 and the ring fluorescent lamp 5 are integrated. It is a hood. With such a configuration, the distance between the TV camera 2 and the steel surface to be measured can be kept constant, and the hood 7 can illuminate with a constant illuminance, so that the TV camera can be focused on the measurement surface and the illuminance can be adjusted. It can be done easily and the shooting conditions can be kept constant. If it is desired to leave the measurement results in the above two embodiments, a video printer may be connected to the image recognition device 3 and recorded.
【0008】[0008]
【発明の効果】以上のように、この発明によれば、鋼材
面に対向配置されたテレビカメラが検出した鋼材面の画
像データをあらかじめ上記画像認識装置に記憶させてお
いた判定基準と比較することにより画像認識装置で2値
化画像処理し、鋼材面の清浄部とそうでない部分を差別
化し、清浄部の面積率を演算することにより、鋼材面の
清浄度を測定者や環境条件によらず一定の判定基準で正
確に判定することができる。As described above, according to the present invention, the image data of the steel surface detected by the television camera facing the steel surface is compared with the judgment standard stored in the image recognition device in advance. By doing so, the image recognition device performs binary image processing to differentiate the clean part and the non-clean part of the steel surface, and by calculating the area ratio of the clean part, the cleanliness of the steel surface can be changed depending on the measurer and environmental conditions. Instead, it can be accurately determined based on a fixed determination criterion.
【図1】本発明の一実施例を示す図、FIG. 1 is a diagram showing an embodiment of the present invention,
【図2】照明とテレビカメラを一体化し、さらに治具に
よって常にテレビカメラと鋼材面が一定距離になるよう
にした画像データの検出部を示す図である。FIG. 2 is a diagram showing an image data detection unit in which an illumination and a television camera are integrated, and a jig is used so that the television camera and the steel material surface are always at a constant distance.
1 鋼材 2 テレビカメラ 3 画像認識装置 4 モニターテレビ 5 リング蛍光灯 6 電源 7 フード 1 Steel 2 TV camera 3 Image recognition device 4 Monitor TV 5 Ring fluorescent lamp 6 Power supply 7 Hood
Claims (1)
ラと、このテレビカメラに連結され、テレビカメラから
の画像データを処理する画像認識装置と、この画像認識
装置に連結され、画像認識装置が処理したデータを映像
化するモニターテレビを用い、上記テレビカメラが検出
した鋼材面の画像データを上記画像認識装置であらかじ
め上記画像認識装置に記憶させておいた判定基準用の画
像データと比較することにより、2値化画像処理し、鋼
材面の洗浄部とそうでない部分とを差別化し、同時に上
記画像認識装置で清浄部または未清浄部の面積率を演算
することを特徴とする鋼材面の判定方法。1. A television camera arranged opposite to a steel surface, an image recognition device connected to the television camera for processing image data from the television camera, and an image recognition device connected to the image recognition device. Using a monitor TV that visualizes the processed data, and comparing the image data of the steel surface detected by the TV camera with the image data for the judgment standard stored in the image recognition device in advance by the image recognition device. By the binarized image processing, the distinction between the washed portion and the non-washed portion of the steel material surface is performed, and at the same time, the area ratio of the clean portion or the unclean portion is calculated by the image recognition device. Method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3356479A JPH05172762A (en) | 1991-12-25 | 1991-12-25 | Judging method for cleanliness of surface of steel material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3356479A JPH05172762A (en) | 1991-12-25 | 1991-12-25 | Judging method for cleanliness of surface of steel material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05172762A true JPH05172762A (en) | 1993-07-09 |
Family
ID=18449225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3356479A Withdrawn JPH05172762A (en) | 1991-12-25 | 1991-12-25 | Judging method for cleanliness of surface of steel material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05172762A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002082061A (en) * | 2000-06-30 | 2002-03-22 | Sms Demag Ag | Method and device for automatic scale detection on surface of metallic strip material, particularly hot rolled steel strip and high grade steel |
WO2009138262A1 (en) * | 2008-05-14 | 2009-11-19 | Centre De Recherches Metallurgiques Asbl-Centrum Voor Research In De Metallurgie Vzw | Method of measuring the cleanness of steel strip |
JP2012026820A (en) * | 2010-07-22 | 2012-02-09 | Nippon Sharyo Seizo Kaisha Ltd | Blast derusting grade inspection system |
JP2016075650A (en) * | 2014-10-09 | 2016-05-12 | 株式会社フジエンジニアリング | Surface cleanness determination device and surface cleanness determination program |
JP2017219348A (en) * | 2016-06-03 | 2017-12-14 | 日本電信電話株式会社 | Method and device for determining derusting end point of metal sample using photographic image |
-
1991
- 1991-12-25 JP JP3356479A patent/JPH05172762A/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002082061A (en) * | 2000-06-30 | 2002-03-22 | Sms Demag Ag | Method and device for automatic scale detection on surface of metallic strip material, particularly hot rolled steel strip and high grade steel |
WO2009138262A1 (en) * | 2008-05-14 | 2009-11-19 | Centre De Recherches Metallurgiques Asbl-Centrum Voor Research In De Metallurgie Vzw | Method of measuring the cleanness of steel strip |
BE1018132A3 (en) * | 2008-05-14 | 2010-05-04 | Ct Rech Metallurgiques Asbl | METHOD FOR MEASURING THE CLEANLINESS OF STEEL BANDS. |
US8483474B2 (en) | 2008-05-14 | 2013-07-09 | Centre de Recherches Métallurgiques asbl—Centrum voor Research in de Metallurgie vzw | Method of measuring the cleanness of steel strip |
JP2012026820A (en) * | 2010-07-22 | 2012-02-09 | Nippon Sharyo Seizo Kaisha Ltd | Blast derusting grade inspection system |
JP2016075650A (en) * | 2014-10-09 | 2016-05-12 | 株式会社フジエンジニアリング | Surface cleanness determination device and surface cleanness determination program |
JP2017219348A (en) * | 2016-06-03 | 2017-12-14 | 日本電信電話株式会社 | Method and device for determining derusting end point of metal sample using photographic image |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990311 |