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Phase Measurement at Discontinuity by Wavelet Transform Algorithm and Fringe Padding Technique

机译:小波变换算法和边缘填充技术在不连续性相位测量中的应用

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This paper presents a phase measurement method at discontinuity by wavelet transform algorithm and fringe padding technique.During fringe analysis,the existing transform-based phase calculation methods can not give correct phase data at discontinuity place because of frequency leakage problem.If the fringe patterns can be extended by fringe padding technique at discontinuity,the frequency leakage will be greatly reduced and even avoided.First,the location of discontinuity needs to be identified by using Wavelet transform and the fringe pattern be extended by fringe padding technique at the discontinuity position.Then,applying Wavelet transform to the padded fringe pattern segments obtains wrapped phase data.After the padded parts are removed,one wrapped phase map is obtained.Finally,in order to independently calculate the absolute phase pixel by pixel,the optimum three-fringe number selection method is used to obtain one absolute phase map.Simulated and experimental data demonstrate the validity of the proposed method to calculate phase information at discontinuity with greatly reduced phase error.
机译:本文提出了一种基于小波变换算法和条纹填充技术的不连续点相位测量方法。在条纹分析过程中,由于频率泄漏问题,现有的基于变换的相位计算方法无法在不连续点提供正确的相位数据。通过在不连续处使用边缘填充技术进行扩展,可以大大减少甚至避免频率泄漏。首先,需要使用小波变换来确定不连续的位置,并在不连续位置处使用边缘填充技术来扩展条纹图案。将小波变换应用于填充的条纹图案段,得到包裹的相位数据。去除填充的部分后,获得一个包裹的相位图。最后,为了逐像素独立地计算绝对相位,最优的三条纹数选择方法获得了一个绝对相图。仿真和实验数据表明所提方法在不连续的情况下计算相位信息且相位误差大大降低的有效性。

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