JPH0777500A - Area ratio detecting method for oxide corrosion section of lustrous steel sheet - Google Patents
Area ratio detecting method for oxide corrosion section of lustrous steel sheetInfo
- Publication number
- JPH0777500A JPH0777500A JP24620293A JP24620293A JPH0777500A JP H0777500 A JPH0777500 A JP H0777500A JP 24620293 A JP24620293 A JP 24620293A JP 24620293 A JP24620293 A JP 24620293A JP H0777500 A JPH0777500 A JP H0777500A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- lustrous
- pixels
- light source
- corrosion
- 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- Withdrawn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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋼板または表面処理鋼板
の腐食評価に関わり、例えばカチオン電着塗装、さらに
は２コート、３コートを行った有機被覆鋼板を腐食試験
に供した後の、酸化腐食部の面積を検出するための方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrosion evaluation of steel sheets or surface-treated steel sheets, for example, cation electrodeposition coating, and further oxidation of organically coated steel sheets coated with 2 or 3 coats after corrosion test. The present invention relates to a method for detecting the area of a corroded portion.
【０００２】[0002]
【従来の技術】近年、自動車や家電・建材向けの鋼板に
対して、製品の耐食性という市場ニーズが高まり、これ
に呼応した新製品の開発研究が盛んに行われている。し
たがって、鋼板の耐食性評価が開発研究に占めるウエイ
トは非常に高い。2. Description of the Related Art In recent years, market demand for corrosion resistance of products has increased for steel sheets for automobiles, home appliances and building materials, and research and development of new products in response to this has been actively conducted. Therefore, the weight of the corrosion resistance evaluation of steel sheets in development research is extremely high.
【０００３】鋼板表面に光沢のある有機膜を有する試験
片の耐食性評価は暴露試験、促進試験等の腐食試験に供
した試験片に発生した酸化腐食部の膨れやクロスカット
部からの膨れ幅を測定することにより行われるが、それ
は熟練された人間の手作業に頼っている。そこで従来か
ら、劣化による色変化による自動識別方法が検討されて
きた。The corrosion resistance of a test piece having a glossy organic film on the surface of a steel sheet is evaluated by measuring the swelling of the oxidation-corroded portion and the swelling width from the cross-cut portion, which have been subjected to the corrosion test such as the exposure test and the accelerated test. It is done by measuring, which relies on skilled human manual work. Therefore, conventionally, an automatic identification method based on color change due to deterioration has been studied.
【０００４】色の変化によって自動的に識別する従来の
装置としては例えば、特開昭６２−２９１５２２号公報
及び特開昭６３−２０００２７号公報に開示されたもの
が知られている。これら従来の装置では、カラーテレビ
カメラからＲ（レッド）、Ｇ（グリーン）及びＢ（ブル
ー）に色分解された３つの信号を取り出し、これらの信
号を複雑なデジタル処理回路で処理することによって撮
像対象の色を高精度で識別可能にしている。しかし、Ｒ
ＧＢ３色の各信号に基づいて色を識別する場合には、信
号レベルを比較する回路が少なくとも３系統以上必要で
あるので、回路構成が複雑になる。しかも、比較回路を
３系統設ける場合には、３組の回路のしきい値をそれぞ
れ調整する必要があるので、それらのしきい値を特定の
物質に合わせるためには、しきい値の調整操作に特別な
知識や経験を有する専門家を必要とする。As a conventional device for automatically identifying a color change, for example, those disclosed in Japanese Patent Laid-Open Nos. 62-291522 and 63-200027 are known. In these conventional devices, an image is obtained by extracting three signals separated into R (red), G (green) and B (blue) from a color television camera and processing these signals with a complicated digital processing circuit. The target color can be identified with high accuracy. But R
In the case of identifying a color based on each signal of three colors of GB, at least three circuits for comparing the signal levels are required, which complicates the circuit configuration. Moreover, when three systems of comparison circuits are provided, it is necessary to adjust the threshold values of the three sets of circuits, and therefore, in order to adjust those threshold values to a specific substance, the threshold value adjustment operation is performed. Need a specialist with special knowledge and experience.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、光沢のある
有機膜を有する鋼板の酸化腐食部を、誰もが自動的に、
容易に、正確に検出することを実現するものである。DISCLOSURE OF THE INVENTION According to the present invention, anyone can automatically detect an oxidative corrosion portion of a steel sheet having a glossy organic film,
This enables easy and accurate detection.
【０００６】[0006]
【課題を解決するための手段】上記課題解決のため本発
明は、光沢のある有機膜を有する鋼板表面の一部分が酸
化した試験片表面に対して、斜め方向より照射する点光
源と、該点光源による前記鋼板表面の正反射光を投影す
る投影スクリーンと、該投影スクリーン上を撮像するテ
レビカメラと、該テレビカメラの映像明度信号を２値化
画像信号とする２値化器と、該２値化器の２値化画像処
理信号を各画素について光沢部を黒［１］と酸化腐食部
を白［０］の画像信号としてアナログ／デジタル変換
し、デジタル値で一時的に記録するフレームメモリと、
該フレームメモリ記録した［０］となった画素数を計数
すると共に、 ｛０となった部分の画素数／（１となった部分の画素数
＋０となった部分の画素数）｝×１００ の演算を行う演算装置、を具備することを特徴とする光
沢のある鋼板の酸化腐食部の面積率検出方法の発明に至
った。Means for Solving the Problems To solve the above problems, the present invention provides a point light source for obliquely irradiating a surface of a test piece in which a surface of a steel sheet having a glossy organic film is oxidized, and the point light source. A projection screen for projecting specularly reflected light from the surface of the steel plate by a light source; a television camera for imaging the projection screen; a binarizer for converting a video brightness signal of the television camera into a binarized image signal; A frame memory for analog / digital conversion of the binarized image processing signal of the binarizer into an image signal of black [1] for the glossy portion and white [0] for the oxidative corrosion portion for each pixel, and temporarily recording the digital value. When,
While counting the number of pixels of [0] recorded in the frame memory, {the number of pixels of the part that became 0 / (the number of pixels of the part that became 1 + the number of pixels that became 0)} × 100 The present invention has led to the invention of a method for detecting the area ratio of an oxidative corrosion portion of a glossy steel plate, which is characterized by comprising a calculation device that performs calculation.
【０００７】[0007]
【作用】発明者等は、表面に光沢のある有機膜を持った
鋼板が腐食すると腐食部分の有機膜の光沢が低下もしく
は***することに着目し、点光源による反射像をスクリ
ーン上に投影し、テレビカメラのような撮像手段を用い
て撮像し、得られる映像明度信号から腐食部分を抽出す
る方法を提案した。そこで本発明においては、これに基
づいて、表面に光沢のある有機膜を有する鋼板に斜め方
向より照射する点光源と、該点光源による前記鋼板表面
の正反射光を投影するスクリーンと、該投影スクリーン
上の正反射光を撮像するテレビカメラと、該テレビカメ
ラが出力する映像明度信号を２値化画像信号とする２値
化器と、該２値化器の２値化画像処理信号を各画素につ
いて光沢部［１］と酸化腐食部［０］の画像信号として
アナログ／デジタル変換し、デジタル値で一時的に記録
するフレームメモリと、該フレームメモリに記録した
［０］となった画素数のみを計算し、鋼板全体に相当す
る画素数との比をとり、腐食部を算出する算出装置と、
を設けている。The present inventors focused on the fact that when a steel sheet having a glossy organic film on the surface corrodes, the glossiness of the organic film at the corroded portion decreases or rises, and a reflection image from a point light source is projected on the screen. , And proposed a method of extracting a corroded part from the obtained image brightness signal by imaging using an imaging means such as a television camera. Therefore, in the present invention, based on this, a point light source that irradiates a steel sheet having a glossy organic film from an oblique direction, a screen that projects the specular reflection light of the steel sheet surface by the point light source, and the projection A television camera for picking up specularly reflected light on the screen, a binarizer for converting the image brightness signal output by the television camera into a binarized image signal, and a binarized image processing signal of the binarizer Regarding a pixel, a frame memory that performs analog / digital conversion as an image signal of a glossy portion [1] and an oxidative corrosion portion [0], and temporarily records the digital value, and the number of pixels that have a value of [0] recorded in the frame memory And a calculation device for calculating the corrosion portion, taking the ratio with the number of pixels corresponding to the entire steel plate,
Is provided.
【０００８】すなわち本発明においては、表面に光沢の
ある有機膜を持つ鋼板の表面に斜め方向から光を照射し
て、その正反射像を投影スクリーンに投影すると、有機
膜が健全な光沢部は明度が高く正反射し、酸化腐食した
部分は明度が低く乱反射して投影されることから、テレ
ビカメラにてこの投影像を撮像し、映像明度信号を明る
さによって２値化することによって酸化腐食部分を認識
する。この酸化腐食部分の認識した２値化画像信号をア
ナログ／デジタル変換し、光沢部分を黒［１］、酸化腐
食部分を白［０］とし、フレームメモリに一時的に記録
する。パーソナルコンピュータは、この［０］となった
画素の数だけ計算し、鋼板全体の画素数との比を採るこ
とで、酸化腐食部分の面積率を算出することができる。That is, in the present invention, when the surface of a steel sheet having a glossy organic film is irradiated with light from an oblique direction and the specular reflection image is projected on a projection screen, a glossy part with a healthy organic film is obtained. Since the high-brightness specular reflection and oxidation-corroded portions are projected with a low-brightness diffuse reflection, the projection image is taken by a TV camera and the image brightness signal is binarized according to the brightness to be oxidized and corroded. Recognize parts. The binarized image signal recognized by this oxidative corrosion portion is converted from analog to digital, the glossy portion is black [1] and the oxidative corrosion portion is white [0], and is temporarily recorded in the frame memory. The personal computer can calculate the area ratio of the oxidatively corroded portion by calculating the number of pixels that have become [0] and taking the ratio with the number of pixels of the entire steel plate.
【０００９】[0009]
【実施例】図１に光沢のある鋼板の酸化腐食部面積率検
出装置の構成を示す。点光源１により被試験片２の表面
を照射し、例えばスリガラスのような投影スクリーン３
に投影させる。酸化腐食していない部分は光沢があるた
め、点光源からの照射光は正反射しスクリーンに明るく
投影される。しかし、酸化腐食部分は光沢が低下もしく
は***しているため一定の方向へ反射せず乱反射となる
ので、その部分の投影スクリーン上に到達する光量は少
なくなり暗く投影される。このようにしてスクリーン上
に投影された像をテレビカメラ４で撮像し、映像明度信
号を２値化処理器５で２値化信号とし、さらにアナログ
／デジタル変換して、光沢部分を黒［０］、酸化腐食部
分を白［１］としてフレームメモリ６にデジタル画像信
号として一時的に記憶するとともにモニタ８に抽出画像
を表示する。フレームメモリ６に記憶された値はパーソ
ナルコンピュータ７で読み取り、［０］となった部分の
みの画素数を計算し、鋼板全体に相当する画素数との比
を採ることで、鋼板の中で酸化腐食部の占める面積率を
算出する。算出した結果はプリンタ９で印字記録する。
これらの動作を自動的に行うためのプログラムは記憶装
置１０より読み出し実行する。EXAMPLE FIG. 1 shows the construction of an apparatus for detecting the area ratio of oxidized and corroded parts of a glossy steel plate. The point light source 1 illuminates the surface of the DUT 2, and the projection screen 3 such as frosted glass is used.
To project. Since the part that is not oxidized and corroded is glossy, the irradiation light from the point light source is specularly reflected and is projected brightly on the screen. However, since the oxidized and corroded portion has a reduced gloss or is raised, it does not reflect in a certain direction and becomes diffuse reflection, so that the amount of light reaching the projection screen at that portion decreases and the image is projected dark. The image thus projected on the screen is captured by the television camera 4, the image brightness signal is converted into a binary signal by the binarization processor 5, and the analog / digital conversion is performed to convert the glossy portion into black [0 ], The oxidized and corroded portion is white [1] and is temporarily stored in the frame memory 6 as a digital image signal, and the extracted image is displayed on the monitor 8. The value stored in the frame memory 6 is read by the personal computer 7, the number of pixels of only the portion which becomes [0] is calculated, and the ratio with the number of pixels corresponding to the entire steel plate is taken to obtain the oxidation in the steel plate. Calculate the area ratio occupied by corroded parts. The calculated result is printed and recorded by the printer 9.
A program for automatically performing these operations is read from the storage device 10 and executed.
【００１０】[0010]
【発明の効果】本法によれば、光沢のある有機膜を有す
る鋼板の酸化腐食部面積を誰もが自動的に、容易に、的
確に測定しうるものであり、迅速な開発研究に大きな効
果を発揮するものである。EFFECTS OF THE INVENTION According to this method, anyone can automatically and easily and accurately measure the area of oxidized and corroded parts of a steel sheet having a glossy organic film, which is very useful for rapid development research. It is effective.
【図１】本発明の一実施例である鋼板の酸化腐食部面積
率検出装置の概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of an apparatus for detecting an area ratio of oxidized and corroded parts of a steel sheet according to an embodiment of the present invention.
１ 点光源 ２ 被試験片 ３ 投影スクリーン ４ テレビカメラ ５ ２値化処理器 ６ フレームメモリ ７ パーソナルコンピュータ ８ モニタ ９ プリンタ １０ 記憶装置 1 point light source 2 test piece 3 projection screen 4 television camera 5 binarization processor 6 frame memory 7 personal computer 8 monitor 9 printer 10 storage device
Claims (1)
部分が酸化した試験片表面に対して、斜め方向より照射
する点光源と、該点光源による前記鋼板表面の正反射光
を投影する投影スクリーンと、該投影スクリーン上を撮
像するテレビカメラと、該テレビカメラの映像明度信号
を２値化画像信号とする２値化処理装置と、該２値化処
理装置の２値化画像処理信号を各画素について光沢部を
黒［１］と酸化腐食部を白［０］の画像信号としてアナ
ログ／デジタル変換し、デジタル値で一時的に記録する
フレームメモリと、該フレームメモリ記録した［０］と
なった画素を計数すると共に、 ｛０となった部分の画素数／（１となった部分の画素数
＋０となった部分の画素数）｝×１００ の演算を行う演算装置、とを具備して鋼板の酸化腐食部
の面積率検出を行うことを特徴とする光沢のある鋼板の
酸化腐食部の面積率検出方法。1. A point light source for obliquely irradiating a surface of a test piece in which a surface of a steel sheet having a glossy organic film is oxidized, and a projection for projecting specular reflection light of the steel sheet surface by the point light source. A screen, a television camera that captures an image on the projection screen, a binarization processing device that uses a video brightness signal of the television camera as a binarized image signal, and a binarized image processing signal of the binarization processing device. With respect to each pixel, a glossy portion is black [1] and an oxidation corrosion portion is an image signal of white [0], which is analog / digital converted and temporarily recorded as a digital value. And an arithmetic unit that counts the number of pixels that have become 0 and calculates {the number of pixels in the portion that becomes 0 / (the number of pixels in the portion that becomes 1 + the number of pixels that becomes 0)} × 100. Of the oxidative corrosion part of the steel plate Area ratio detecting method of oxidation corrosion of the steel sheet with a glossy and performing factor detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24620293A JPH0777500A (en) | 1993-09-07 | 1993-09-07 | Area ratio detecting method for oxide corrosion section of lustrous steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24620293A JPH0777500A (en) | 1993-09-07 | 1993-09-07 | Area ratio detecting method for oxide corrosion section of lustrous steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0777500A true JPH0777500A (en) | 1995-03-20 |
Family
ID=17145039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24620293A Withdrawn JPH0777500A (en) | 1993-09-07 | 1993-09-07 | Area ratio detecting method for oxide corrosion section of lustrous steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0777500A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000094540A (en) * | 1998-09-18 | 2000-04-04 | Mitsuboshi Belting Ltd | Method for measuring rubber bleeding of toothed belt |
| JP2008096429A (en) * | 2006-09-14 | 2008-04-24 | Jfe Steel Kk | Area ratio measuring instrument of corrosion part for surface-treated steel plate, and method and instrument for measuring area ratio of white rust part of galvanized sheet |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| WO2023111854A1 (en) * | 2021-12-15 | 2023-06-22 | 3M Innovative Properties Company | Optical inspection system for detecting surface profile defects in manufactured webs |
-
1993
- 1993-09-07 JP JP24620293A patent/JPH0777500A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000094540A (en) * | 1998-09-18 | 2000-04-04 | Mitsuboshi Belting Ltd | Method for measuring rubber bleeding of toothed belt |
| JP2008096429A (en) * | 2006-09-14 | 2008-04-24 | Jfe Steel Kk | Area ratio measuring instrument of corrosion part for surface-treated steel plate, and method and instrument for measuring area ratio of white rust part of galvanized sheet |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| WO2023111854A1 (en) * | 2021-12-15 | 2023-06-22 | 3M Innovative Properties Company | Optical inspection system for detecting surface profile defects in manufactured webs |
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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: 20001107 |