This paper presents a novel algorithm to analyze and judge the visibility of Moiré appearing on metal mesh touch screen whose resolution is 2 K from spatial frequency domain by using Fourier transformation. In this method, we utilize the characteristic spatial frequency to represent the visibility of Moiré, and two-dimensional Fourier transformation is performed on the simulation image obtained by calculating the pixel transmittance. The characteristic frequency is obtained by frequency filtering, and the Moiré visibility is evaluated according to it. In this paper, three different displays are used for experiments, 1.89 lp/mm, 1.94 lp/mm and 1.85 lp/mm are taken respectively as the dividing line to classify the performance of Moiré. The matching ratios of the three displays are 84.47%, 82.30% and 80.12% respectively, showing pretty high accuracy with the practical matching result. This new method may be quite useful for guiding the manufacture of metal mesh touch panel.

本文提出了一种新的算法，通过傅里叶变换从空间频域分析和判断金属网触摸屏上出现的莫尔条纹的可见性，其分辨率为2 K。在该方法中，我们利用特征空间频率来表示莫尔条纹的可见度，并对计算像素透射率得到的模拟图像进行二维傅里叶变换。通过频率滤波得到特征频率，并据此评价莫尔可见度。本文采用三种不同的显示器进行实验，分别以1.89 lp/mm、1.94 lp/mm和1.85 lp/mm为分界线对莫尔条纹的性能进行分类。三款显示器的匹配率分别为84.47%、82.30%和80.12%，实际匹配结果显示出相当高的准确性。这种新方法可能对指导金属网状触控面板的制造非常有用。