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Noise Filter for Surface Shape Measurement in Digital Holography

机译:用于数字全息术中表面形状测量的噪声滤波器

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摘要

Phase difference image using phase-shifting digital holography is one of the prospective methods for non-contact shape measurement. For the application, filtering of the obtained image is needed to reduce the speckle noise. Conventional filter, e.g. moving average filter, causes loss of the shape information especially around the region with high steepness. To solve this problem novel filter has been developed that kept steepness of the shape in noise reduction. The filtered data were compared with conventionally filtering ones and the former was closer to the data observed by a laser measuring microscope.
机译:使用相移数字全息术的相差图像是用于非接触形状测量的预期方法之一。对于该应用,需要对获得的图像进行滤波以减少斑点噪声。常规过滤器移动平均滤波器会导致形状信息的损失,尤其是在高陡度区域附近。为了解决这个问题,已经开发了新颖的滤波器,其在降低噪声的同时保持形状的陡度。将过滤后的数据与常规过滤后的数据进行比较,前者更接近于激光测量显微镜观察到的数据。

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