印刷电路板光电图像畸变校正研究

Study on distortion correction of printed circuit board photoelectricity image

摘要:

为了校正因CCD摄像系统视场较大等原因产生畸变现象的印刷电路板(PCB)光电图像,提出了一种自适应控制的图像畸变校正方法。详细分析了存在几何畸变图像进行校正的基本原理,首先给出了畸变图像任一点坐标与校正图像对应点坐标之间的关系,然后以畸变图像与校正图像间控制点对的映射关系为基础,采用最小二乘法(LSM)、多项式拟合和双线性插值的灰度重建,由自适应控制关系找到畸变图像与校正图像控制点对的对应坐标,使发生几何畸变的图像得到有效校正。对方格测试图像和由CCD摄像系统获取的存在几何畸变的PCB光电图像进行了实际校正试验,结果证明了基本原理分析的正确性。

Abstract:

In order to correct the distortion phenomenon of printed circuit board(PCB)photoelectricity image acquired from CCD camera system because of bigger visual field,an emendation method based on adaptive control was proposed.The basic principle that corrects the image which has geometric distortion was analyzed in detailed:Firstly,the relationship between the coordinates of points in distortion image and the coordinates of the corresponding points in emendation image was given;Secondly,based on the mapped relat...