自动变倍镜头在机器视觉检测中的应用

Application of Motorized Zoom Lens for Machine Vision Detection

要将由步进电机驱动的自动变倍镜头应用到2.5D光学测量仪器中必须要解决两个问题,一是镜组转动过程中光轴摆动造成的成像误差,另外一个是确定某一脉冲位置上的实际光学放大倍率。在工程实践中通过图像处理和高次曲线拟合的方法解决这些问题,弥补了传统2.5D光学测量系统只能使用特定脉冲位置的光学放大倍率这一不足之处,同时实现将图像测量误差控制到pixel。

There are two problems when use, motorized zoom lens for machine vision detection by 2.5D optic measuring system. One is the error of image position due to the swing of optic axis when the step motor rolls the lens to a different position. The other is the decision of the magnification in specified pulse position. Uses image processing and high order curve re gression can solve these problems. This method complements the traditional 2,5D optic measuring system which can only use specified magnification and controls the error of detection in the range of pixel.