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Comparative analysis on some spatial-domain filters for fringe pattern denoising

机译:几种用于条纹图案去噪的空间域滤波器的比较分析

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摘要

Fringe patterns produced by various optical interferometric techniques encode information such as shape, deformation, and refractive index. Noise affects further processing of the fringe patterns. Denoising is often needed before fringe pattern demodulation. Filtering along the fringe orientation is an effective option. Such filters include coherence enhancing diffusion, spin filtering with curve windows, second-order oriented partial-differential equations, and the regularized quadratic cost function for oriented fringe pattern filtering. These filters are analyzed to establish the relationships among them. Theoretical analysis shows that the four filters are largely equivalent to each other. Quantitative results are given on simulated fringe patterns to validate the theoretical analysis and to compare the performance of these filters.
机译:由各种光学干涉技术产生的条纹图案可对诸如形状,变形和折射率之类的信息进行编码。噪声会影响条纹图案的进一步处理。条纹图案解调之前通常需要进行降噪。沿边缘方向过滤是一种有效的选择。这样的滤波器包括相干增强扩散,带有曲线窗口的自旋滤波,二阶定向偏微分方程以及用于定向条纹图案滤波的正则二次成本函数。分析这些过滤器以建立它们之间的关系。理论分析表明,这四个滤波器在很大程度上是等效的。给出了模拟条纹图案的定量结果,以验证理论分析并比较这些滤波器的性能。

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