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A Contrast Adjustment Thresholding Method for Surface Defect Detection Based on Mesoscopy

机译：基于介观的对比度校正阈值检测方法

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Titanium-coated surfaces are prone to tiny defects such as very small cracks, which are not easily observable by the naked eye or optical microscopy. In this study, two new thresholding methods, namely contrast-adjusted Otsu’s method and contrast-adjusted median-based Otsu’s method, are proposed for automated defect detection system for titanium-coated aluminum surfaces. The two proposed methods were compared with four existing thresholding techniques in terms of accuracy and speed of defect detections for images of 700, 900, and 1000 dpi obtained using high-resolution scanning. Experimental results have shown that the proposed contrast-adjusting methods have performance similar to minimum error thresholding (MET) and are generally better than Otsu’s method.
机译：钛涂层表面容易出现微小缺陷，例如非常小的裂纹，而肉眼或光学显微镜很难观察到。在这项研究中，提出了两种新的阈值处理方法，即对比调整的Otsu方法和对比调整的基于中值的Otsu方法，用于钛涂层铝表面的自动缺陷检测系统。就使用高分辨率扫描获得的700、900和1000 dpi图像的缺陷检测的准确性和速度而言，将这两种提议的方法与四种现有阈值技术进行了比较。实验结果表明，提出的对比度调整方法具有与最小误差阈值（MET）相似的性能，并且通常比Otsu的方法更好。

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