工件表面质量检测中高速图像采集技术研究

摘要

Aiming at the high-speed image acquisition of workpiece surface online detection,a workpiece image high-speed online acquisition method was produced. The quantitative relationship between the positioning accuracy in the high speed online image acquisition,motion blur,exposure time,and the speed of workpiece was analyzed.The effect between the vibration of the workpiece and transfer mechanism was analyzed.An image acquisition sequence was designed.Fast trigger was implemented by photoelectric sensor.The accurate positioning was implemented by using the high accurate time delay module,controlling the motion blur by reducing the exposure time.A high-speed image acquisition system was designed based on the high-speed image acquisition method.The positioning accuracy was less than 0.1 mm,and the motion blur was less than 1 pixel,ensuring the accuracy of the workpiece positioning and image quality.It is advantageous to the quality detection of workpiece surface.%针对工件表面质量在线检测过程中的高速图像采集环节，提出了一种工件图像高速采集方法。分析了图像采集中定位精度、运动模糊、曝光时间和工件运行速度之间的定量关系，研究了传送机构与工件表面的振动对图像采集的影响，设计了图像采集时序。利用光电传感器实现工件的快速触发，使用高精度延时模块实现工件的准确定位，通过减小曝光时间控制运动模糊。基于高速采集方法设计了高速图像采集系统，定位精度小于0．1 mm，运动模糊小于1pixel，保证了工件的准确定位和图像的清晰度，有效保证了工件表面质量检测。