汽车发动机缸孔内表面缺陷的自动检测技术研究

摘要

Pointing at the casting defects of automobile engine cylinder problem ,researches on automatic measurement technique of cylinder surface defect ,designs a system based on machine vision technology for engine cylinder bore surface defect automatic detection.Presents a round fast detection algorithm based on Hough transform ,to extract the effective cylinder for hole bottom round and top pixel round;as annular like is not convenient for observation and measurement ,and has obvious geometric distortion and the distortion problem ,put forwards the ring into rectangular algorithm .The experiment proved that average error of the defect area calculation is lower using this method ,and is a fast and efficient way to calculate circular defect area .%针对汽车发动机缸体铸造缺陷的问题，进行了缸孔内表面缺陷自动测量技术的研究，设计了一种基于机器视觉技术的缸孔内表面缺陷自动检测系统。采用基于Hough变换的快速检测圆算法，有效地提取了缸孔的底圆、顶圆的像素；针对圆环形图像不便于观察和测量，且有明显几何畸变和失真的问题，提出了将圆环形图像展成矩形的算法，并通过实验证明了基于Hough变换的快速检测圆算法所计算的缺陷面积平均误差较低，是一种快速有效的圆环形缺陷面积计算方法。