中文摘要：

在无衍射光测量中,莫尔条纹的计数准确性将影响测量结果的正确性。在分析无衍射光莫尔条纹特征的基础上,提出利用图像处理方法实现莫尔条纹的精确计数方法。对采集到含有高频干扰的无衍射莫尔条纹,利用图像增强提高对比度,选择合适的低通滤波器消除无衍射光中高频信息及噪声信号,再经过二值化和平滑处理得到轮廓清晰的莫尔条纹,然后利用坐标变换将图像转换到极坐标,根据莫尔条纹灰度值在一周内的突变特性,采用多次间隔扫描法确定条纹数目。实验结果表明,该方法能精确、有效地计算无衍射光莫尔条纹数目。

英文摘要：

The counting accuracy of moir6 fringes will affect the accuracy of the measurement results in non-diffracting optical measurement. On the basis of analyzing the characteristics of non-diffracting moirie fringes,an accurate counting method of moire fringes is proposed with imaging processing. By image enhancement ,image contrast is progressed,and low-pass filtering is also applied to eliminate high frequency components and noise of the image.Substantially,clear contour of moire fringes can be obtained by binarizafion and smoothing process. After the transformation of the image to polar coordinate, the number of moire fringes can be counted by multiple interval scanning method from the gray value alternation of moire fringe image in a circle. The experimental results show that this method is accurate in counting molte fringes.