数字图像处理技术在直条纹间距测量中的应用

Abstract

论文介绍了一种应用数字图像处理技术进行直条纹间距测量的方法。利用CCD器件采集条纹图像，然后利用数字图像处理技术的二值化与细化操作提取中心条纹，对中心条纹图像进行Hough变换，由参数空间的峰值位置计算得到相邻条纹之间的距离。该方法与传统傅里叶变换法相比较，具有非常大的应用优势，并且适用于相等间距或不等间距的直条纹图像。仿真与实验证明了该方法的可行性与有效性。 A method based on the application of digital image-processing in interference fringes spacing testing has been described in the paper. Through the CCD camera, the interference fringes are captured. Then two image-processing operations, binaryzation and thinning processing, are used to withdraw the center grain. While the Hough transform is applied to the obtained center grain image, the distance between any adjacent fringes is calculated according to the position coordinates of peak values in the parameter space. Compared with the Fourier transform method (FTM), the proposed method has a good applied prospect, and can be suitable to the occasion with equidistant or non-equidistant fringes. Simulation and experiment are given and show this method is feasibility and effectiveness.