中文摘要：

提出了一种用于空心圆柱端面缺陷快速检测的新方法。为适应不同尺寸工件以及工件不同端面的几何特征，采用入射角可变的矩形LED阵列作为光源，通过CCD进行图像采集并进行适当的预处理，约化图像中的有用信息以提高检测效率。工件端面检测采用优化的Hough变换法实现标准圆拟合，通过计算实际像素点至拟合圆的径向偏移量以获得缺陷像素点，实现端面缺陷定量评价。实验结果表明，该方法具有较高的检测速度与精度，可用于空心圆柱等小尺寸工件端面质量的在线检验，提高现有的生产线效率。

英文摘要：

A new method for undersized part surface defect detection is proposed. In order to meet workpieces with different sizes and different surface geometry characteristics, we use the rectangular LED array with variable incidence angle as the light source. The original facing image is captured with CCD and treated with a series of pre-processing procedures. Then optimized Hough transform is adopted to fit circle rapidly for end face detection. Radial offsets from pixel point to fitted standard circle are calculated to acquire defected pixel points and then realize the quantitative evaluation for the end face defect. Experimental results show that this method can realize on-line detection of undersized part surface quality promptly and accurately as to improve the efficiency of existing production lines.