基于改进倾斜刃边法的光电成像系统MTF高准确度测试

发布时间：2018-06-30 11:19

本文选题：成像系统 + 调制传递函数　；参考：《光子学报》2016年12期

【摘要】：提出一种能高准确度测试光电成像系统调制传递函数的改进的倾斜刃边法.利用一种自动确定高低阈值的改进Canny算子提取边缘位置点,对提取到的边缘位置点进行线性拟合求得刃边倾角,在利用费米函数拟合边缘扩散函数的过程中,提出一种邻域平均值和设定误差容限的多重去噪改进方法.通过仿真与物理实验证明了本文方法的有效性,并分析了刃边倾角、噪声变化对本文方法与传统方法MTF测试准确度的影响.实验结果表明:本文方法的调制传递函数测试准确度达到0.004 9,重复准确度达到0.003 1,皆优于传统方法;说明其具有较高的测试准确度和良好的测试重复性,并且具有较强的抗噪性,基本不受刃边倾角变化的影响.
[Abstract]:An improved tilt edge method for measuring modulation transfer function of optoelectronic imaging system with high accuracy is proposed. An improved Canny operator, which can automatically determine the threshold, is used to extract edge position points. The edge dip angle is obtained by linear fitting of the extracted edge position points. In the process of fitting edge diffusion function with Fermi function, An improved method of multilevel denoising with neighborhood average and set error tolerance is proposed. The effectiveness of the proposed method is proved by simulation and physical experiments, and the effects of edge inclination angle and noise variation on the accuracy of MTF measurement by the proposed method and the traditional method are analyzed. The experimental results show that the accuracy of modulation transfer function and repetition is 0.004 9 and 0.003 1 respectively, which is superior to the traditional method, which shows that the proposed method has high accuracy and good repeatability. Moreover, it has strong noise resistance and is not affected by the change of edge inclination angle.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家863高新技术发展项目(No.2011AA12A103) 中国地质调查局工作项目(No.1212011120227)资助~~
【分类号】：TP391.41

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