JP6027295B1 - 溶融めっき鋼板の表面欠陥検査装置および表面欠陥検査方法 - Google Patents
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Abstract
Description
2 溶融亜鉛めっき鋼板(溶融めっき鋼板)
3 照明部
4 正反射光撮像部
5 乱反射光撮像部
6 画像信号処理部
8 撮像対象部位
T1 正反射画像信号
T2 乱反射画像信号
Claims (4)
- 溶融めっき鋼板の表面上にある撮像対象部位を照明する照明部と、
前記撮像対象部位からの正反射光を撮像する正反射光撮像部と、
同撮像対象部位からの乱反射光を撮像する乱反射光撮像部と、
前記正反射光撮像部が撮像して得られた正反射画像信号と、前記乱反射光撮像部が撮像して得られた乱反射画像信号とを処理する画像信号処理部と、
を備え、
乱反射光の輝度が、乱反射角度が正反射角度に対して所定角度差以内である場合に、地合での乱反射光の輝度よりも低輝度になり、乱反射角度が正反射角度に対して所定角度差を超える場合に、地合での乱反射光の輝度よりも高輝度になる、第1種の欠陥と第2種の欠陥を分類する溶融めっき鋼板の表面欠陥検査装置であって、
前記正反射光撮像部と前記乱反射光撮像部とは同時に前記撮像対象部位からの反射光を撮像するものであり、
前記乱反射光撮像部が撮像する前記乱反射光の乱反射角度は、反射面が地合である場合の反射光の輝度を基準として、反射面が第1種の欠陥である場合の反射光の輝度が前記基準より高輝度となり、かつ、反射面が第2種の欠陥である場合の反射光の輝度が前記基準より低輝度となる角度であり、
前記画像信号処理部は、
前記正反射光撮像部が撮像して得られた正反射画像信号のうち、所定の閾値より低輝度の部位を表面欠陥部位として抽出し、
抽出された前記表面欠陥部位に対応する部位に関し、前記乱反射光撮像部が撮像して得られた乱反射画像信号に対し、反射面が地合である場合の反射光の輝度を閾値として閾値処理を行うことにより、抽出された前記表面欠陥部位の欠陥種類を第1種の欠陥と第2種の欠陥に分類判定する、
ことを特徴とする溶融めっき鋼板の表面欠陥検査装置。 - 請求項1に記載の溶融めっき鋼板の表面欠陥検査装置において、
前記画像信号処理部は、前記乱反射光撮像部が地合を撮像して得られる乱反射画像信号の移動平均値を算出し、算出された移動平均値を前記閾値処理の閾値として使用し、当該閾値より高輝度の部位を第1種の欠陥と判定し、当該閾値より低輝度の部位を第2種の欠陥と判定する、
ことを特徴とする溶融めっき鋼板の表面欠陥検査装置。 - 溶融めっき鋼板の表面を照明し、
前記溶融めっき鋼板上の撮像対象部位からの正反射光および乱反射光をそれぞれ撮像し、
撮像してそれぞれ得られた正反射画像信号と乱反射画像信号とを処理することにより、乱反射光の輝度が、乱反射角度が正反射角度に対して所定角度差以内である場合に、地合での乱反射光の輝度よりも低輝度になり、乱反射角度が正反射角度に対して所定角度差を超える場合に、地合での乱反射光の輝度よりも高輝度になる、第1種の欠陥と第2種の欠陥を分類する、
溶融めっき鋼板の表面欠陥検査方法であって、
前記撮像対象部位からの正反射光の撮像と乱反射光の撮像は同時に行われるものであり、
撮像する前記乱反射光の乱反射角度は、反射面が地合である場合の反射光の輝度を基準として、反射面が第1種の欠陥である場合の反射光の輝度が前記基準より高輝度となり、かつ、反射面が第2種の欠陥である場合の反射光の輝度が前記基準より低輝度となる角度であり、
前記処理は、
撮像して得られた正反射画像信号のうち、所定の閾値より低輝度の部位を表面欠陥部位として抽出し、
抽出された前記表面欠陥部位に対応する部位に関し、撮像して得られた乱反射画像信号に対し、反射面が地合である場合の反射光の輝度を閾値として閾値処理を行うことにより、抽出された前記表面欠陥部位の欠陥種類を第1の欠陥と第2の欠陥に分類判定するものである、
ことを特徴とする溶融めっき鋼板の表面欠陥検査方法。 - 請求項3に記載の溶融めっき鋼板の表面欠陥検査方法において、
前記処理において、地合を撮像して得られる乱反射画像信号の移動平均値を算出し、算出された移動平均値を前記閾値処理の閾値として使用し、当該閾値より高輝度の部位を第1種の欠陥と判定し、当該閾値より低輝度の部位を第2種の欠陥と判定する、
ことを特徴とする溶融めっき鋼板の表面欠陥検査方法。
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KR101800597B1 (ko) | 2015-03-31 | 2017-11-22 | 닛신 세이코 가부시키가이샤 | 용융 도금 강판의 표면 결함 검사 장치 및 표면 결함 검사 방법 |
JP6117398B1 (ja) * | 2016-03-30 | 2017-04-19 | 日新製鋼株式会社 | 鋼板の表面欠陥検査装置および表面欠陥検査方法 |
TWI630366B (zh) * | 2017-04-28 | 2018-07-21 | 中國鋼鐵股份有限公司 | 鋼板寬度量測系統及其方法 |
EP3678143B1 (en) * | 2018-10-01 | 2023-08-16 | Sumitomo Electric Toyama Co., Ltd. | Method and device for manufacturing plated wire |
CN109557084A (zh) * | 2019-01-17 | 2019-04-02 | 南通市产品质量监督检验所 | 以镀层铁元素含量鉴定制绳镀锌钢丝镀锌方式的检测方法 |
DE102019204346A1 (de) * | 2019-03-28 | 2020-10-01 | Volkswagen Aktiengesellschaft | Verfahren und System zum Überprüfen einer optischen Beanstandung an einem Kraftfahrzeug |
DE102019210727A1 (de) * | 2019-07-19 | 2021-01-21 | Thyssenkrupp Steel Europe Ag | Verfahren zum Bestimmen eines Reinigungszustands einer Oberfläche eines Flachprodukts und Flachprodukt |
CN110738237A (zh) * | 2019-09-16 | 2020-01-31 | 深圳新视智科技术有限公司 | 缺陷分类的方法、装置、计算机设备和存储介质 |
CN112345555A (zh) * | 2020-10-30 | 2021-02-09 | 凌云光技术股份有限公司 | 外观检查机高亮成像光源系统 |
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JP6104745B2 (ja) * | 2013-07-23 | 2017-03-29 | 株式会社東芝 | 穴検査装置 |
CN103743709A (zh) * | 2014-01-15 | 2014-04-23 | 唐山英莱科技有限公司 | 一种基于多层介质反射镜成像的线结构光焊缝检测系统 |
KR101800597B1 (ko) | 2015-03-31 | 2017-11-22 | 닛신 세이코 가부시키가이샤 | 용융 도금 강판의 표면 결함 검사 장치 및 표면 결함 검사 방법 |
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JPH08278258A (ja) * | 1995-04-10 | 1996-10-22 | Nippon Steel Corp | 表面検査装置 |
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JP2012103017A (ja) * | 2010-11-05 | 2012-05-31 | Jfe Steel Corp | 溶融金属メッキ鋼板のドロス欠陥検査装置およびドロス欠陥検査方法 |
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WO2016158873A1 (ja) | 2016-10-06 |
KR20170117600A (ko) | 2017-10-23 |
US10041888B2 (en) | 2018-08-07 |
TW201640101A (zh) | 2016-11-16 |
EP3279645A1 (en) | 2018-02-07 |
MX2017012698A (es) | 2018-01-11 |
CN107533012B (zh) | 2019-07-19 |
EP3279645A4 (en) | 2018-09-26 |
MY165130A (en) | 2018-02-28 |
TWI627399B (zh) | 2018-06-21 |
JPWO2016158873A1 (ja) | 2017-04-27 |
KR101800597B1 (ko) | 2017-11-22 |
BR112017021163A2 (ja) | 2018-07-17 |
MX360696B (es) | 2018-11-14 |
US20180017503A1 (en) | 2018-01-18 |
CN107533012A (zh) | 2018-01-02 |
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