高精密轴承是一种圆柱型零件，针对圆柱型零件高曲率表面缺陷及外形尺寸不能同时进行在线检测的问题，设计并实现了基于机器视觉的在线检测系统。检测时，为了解决金属件表面反光的问题，设计了专用的光源系统和照明方式，通过光学系统和机械旋转平台的配合，圆柱型零件在旋转的过程中被光学系统成像，从而可以采集到完整的圆柱面图像;经过快速的图像处理技术，可以检测到微米级的轴承表面缺陷及外形尺寸。检测结果表明系统具有高效率、精度高、易于使用等特点，可有效解决高精密轴承表面缺陷及尺寸在线检测的问题。

High precision bearing is a kind of cylindrical parts. A machine vision based on online detection system is designed and implemented in this paper to meet the need that cylindrical parts of high curvature surface defects and size can not simultaneously be online detection. During the measurement, a special light source and lighting system are used to solve the problem of the reflections on the surface of the metal. Through the combination of optical systems and mechanical rotating platform, cylindrical parts are imaged by the optical system in the process of rotation, then a complete cylindrical surface image can be acquired. Micron surface defects and dimensions of bearing can be detected, after the fast image processing technique. Experiments show that the proposed system has the features of high efficiency, high accuracy and ease of use. It can effectively meet the needs of high precision bearing detection and dimension online detection.