In film defect detection and reparation, scratch is a common type of film detects which is hard to detect.

在电影胶片降质检测和修复中，划痕是最为常见且较难检测的一种胶片降质。

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Surface defect of steel ball is main reason for bearing fail. This paper developed a sort of surface defect detect system based on machine vision to apply in steel ball.

由于钢球表面的缺陷是造成轴承失效的主要原因，本文研发一种面向轴承企业应用基于机器视觉的钢球表面缺陷检测系统。

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In the experiments, the symmetric and antisymmetric modes, S1 and A1, were excited to detect hidden corrosion defect respectively using pitch-catch technique.

实验中，采用了一发一收法，并分别激励了对称模态s1和反对称模态A 1对该缺陷进行了检测。

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