Crack detection in magnetic tile images using nonsubsampled shearlet transform and envelope gray level gradient

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• 作者：Chengli Yang ; Peiyong Liu ; Guofu Yin ; ^{gfyin@scu.edu.cn} ; Ling Wang
• 关键词：Magnetic tile ; Crack detection ; Nonsubsampled shearlet transform ; Envelope gray level gradient
• 刊名：Optics & Laser Technology
• 出版年：2017
• 出版时间：1 May 2017
• 年：2017
• 卷：90
• 期：Complete
• 页码：7-17
• 全文大小：1977 K
• 卷排序：90

文摘

Nonsubsampled shearlet transform is first used to detect cracks of magnetic tile. A filtering using envelope gray level gradient is proposed for background correction. A shearlet coefficient variance discriminator is used to detect cracks. A novel machine vision system has verified the validity of the proposed algorithm. The proposed method is effective in detecting cracks longer than 0.9 mm.