基于结构光投影的二维S变换轮廓术 |
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引用本文: | 王焘. 基于结构光投影的二维S变换轮廓术[J]. 光学学报, 2012, 32(12): 1207002 |
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作者姓名: | 王焘 |
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作者单位: | 王焘:四川大学电子信息学院光电系, 四川 成都 610064
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基金项目: | 国家自然科学基金(61177010)和国家973计划(2011CB301804)资助课题。 |
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摘 要: | S变换是一种集合了窗口傅里叶变换和小波变换优点的时频分析技术,目前一维S变换已成功应用于结构光投影的条纹相位解调中。由于二维S变换可以对图像在两个方向上进行时频分析,具有更优于一维S变换的分析和处理能力。为了完善S变换的条纹相位解调理论,将二维S变换方法引入到基于结构光投影的三维光学测量中,研究了二维S变换在条纹相位解调中的原理及应用,给出了详尽的理论分析,并同一维S变换结果进行了比较。模拟和实验都表明,在条纹图解相中,二维S变换比一维S变换提取的相位精度更高,即使在存在较严重噪声污染的情况下也表现出良好的可靠性,体现出二维S变换提取相位的优势。
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关 键 词: | 测量 时频分析 条纹相位解调 二维S变换 噪声抑制 |
收稿时间: | 2012-06-26 |
2D S-Transform Profilometry Based on the Structured Light ProjectionWang Tao |
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Abstract: | The S transform is one of the time-frequency analysis techniques which combines the advantages of both the short-time Fourier transform and wavelet transform. The one-dimensional S transform has been successfully used in fringe phase demodulation based on structured light projection. The two-dimensional (2D) S transform is able to carry out the time-frequency analysis for images in two directions, which is better than one-dimensional (1D) S transform. The 2D S transform based on the structured light projection method is introduced to the three-dimensional (3D) optical measurement for completing S transform fringe phase demodulation theory. This work studies the theory and application of the 2D S transform in fringe phase demodulation and gives a detailed theoretical analysis. Furthermore, a comparison between the 2D S transform and the 1D S transform is carried out in fringe phase demodulation. The comparison result shows that the 2D S transform will achieve a higher accuracy than 1D S transform in extracting the phase distribution of the fringe patterns, even when the fringe patterns are seriously polluted by noises. Both the computer simulations and experiments verify that the 2D S transform outperforms the 1D S transform in the fringe analysis. |
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Keywords: | measurement time-frequency analysis fringe phase demodulation 2D S transform noise suppression |
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