Speckle-noise-reduction method of projecting interferometry fringes based on power spectrum density.
Speckle-noise-reduction method of projecting interferometry fringes based on power spectrum density.
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DOI：
10.1364/ao.51.006974
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发表时间：
2012-10
期刊：
影响因子：
1.9
通讯作者：
Liping Zhou;Jianghong Gan;Xiaojun Liu;Long Xu;Wenlong Lu
中科院分区：
文献类型：
--
作者：
Liping Zhou;Jianghong Gan;Xiaojun Liu;Long Xu;Wenlong Lu
条纹投影技术以其非接触、全场采集、高分辨率等优点在表面检测中发挥着重要作用。投影干涉条纹的基本问题之一是条纹图中存在的散斑噪声。提出了一种基于功率谱密度（PSD）阈值化的散斑噪声抑制方法，该方法包括3个步骤：首先根据傅立叶变换得到的频谱计算PSD;其次，通过PSD阈值化构造滤波器，滤除散斑噪声的频率成分;最后，通过逆傅立叶变换得到降噪图像。实验结果证明了该方法的可行性和有效性。
The fringe projection technique plays an important role in surface inspection, due to its noncontact, full-field acquisition and high resolution. When using projecting interferometry fringes, one of the basic problems encountered is the speckle noise existing in the fringe pattern. In this paper, a novel method is proposed to reduce the speckle noise based on power spectrum density (PSD) thresholding, which consists of three steps: first, PSD is calculated according to the frequency spectrum obtained by Fourier transform; second, a filter is constructed by a PSD thresholding to filter the frequency content of the speckle noise; and finally inverse Fourier transform is used to obtain the noise-reduction image. Experimental results prove the feasibility and effectiveness of the presented method.