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Use of interferometric directionality for noise reduction

机译：干涉测量方向性用于降噪

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Accurate static fringe-pattern analysis is very important for the successful application of a variety of interferometric techniques. In most cases of practical application, especially in aerodynamic flow testing, substantial noise can be introduced due to prevailing adverse environments. A means for efficiently reducing interferometric noise is thus desirable. Conventional noise reduction has mostly depended on ordinary averaging or median filtering in a squared mask to remove high-frequency components. These techniques, however, can induce some side effects of image blurring. If the structural integrity needs to be preserved, the method to be adopted should be able to eliminate noise efficiently without altering local intensity gradients, that is, local contrasts. In this paper, the concept of directional smoothing is introduced and its application to interferometric noise reduction is presented. Interfero-grams provide locally similar fringe directions, that is, isophase lines contaminated by noise, and thus contain directional information. In essence, the method exploits this valuable fringe directionality by setting up a slender mask of large aspect ratio along a fringe. A new value, that is, the average or median intensity of the mask, is then assigned to each pixel. The mask can be straight or curved. For a straight mask, the average direction of fringes within a processing region is employed. A curved mask is made to conform to a fringe curve. The proposed method is tested by computer simulation of experiments as well as with real interferograms. The results appear to be promising as compared with conventional techniques, especially for high-level noise.
机译：准确的静态条纹图形分析对于成功应用各种干涉技术非常重要。在实际应用的大多数情况下，尤其是在空气动力学流量测试中，由于普遍存在的不利环境，可能会引入较大的噪音。因此，需要一种用于有效降低干涉噪声的装置。常规的降噪主要取决于平方屏蔽中的普通平均或中值滤波以去除高频分量。但是，这些技术可能会引起图像模糊的一些副作用。如果需要保持结构完整性，则所采用的方法应该能够有效消除噪声，而不改变局部强度梯度，即局部对比度。本文介绍了方向平滑的概念，并介绍了其在干涉降噪中的应用。干涉图提供局部相似的条纹方向，即被噪声污染的等相线，因此包含方向信息。从本质上讲，该方法通过沿边缘设置大纵横比的细长蒙版来利用这种有价值的边缘方向性。然后，将新值（即蒙版的平均强度或中间强度）分配给每个像素。面罩可以是直的或弯曲的。对于直掩模，采用加工区域内条纹的平均方向。使弯曲的掩模符合条纹曲线。通过计算机模拟实验以及真实干涉图对所提出的方法进行了测试。与传统技术相比，该结果似乎很有希望，特别是对于高水平噪声而言。

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