光学学报, 2010, 30 (3): 733, 网络出版: 2010-03-11
基于二维连续小波变换的ESPI条纹图相位提取方法
Phase Extraction of an ESPI Fringe Pattern by Using Two-Dimensional Continuous Wavelet Transform
图像处理 相位提取 电子散斑干涉条纹图 小波变换 散斑噪声 image processing phase extraction ESPI fringe patterns wavelet transform speckle noise
摘要
提出了一种基于二维连续小波变换的电子散斑干涉(ESPI)条纹图相位提取方法。通过检测二维小波脊确定条纹相位,并引入条纹频率作为向导,有效地避免了相位解调过程中的符号奇异性问题,从而使该算法既能处理开条纹图也能处理闭条纹图,且对散斑噪声具有较强的抑制能力。数值模拟和实验结果表明,该方法在抑制散斑噪声的同时能够有效地提取出条纹相位,对开条纹图和闭条纹图都能处理。
Abstract
A method for phase extraction of an electronic speckle pattern interferometry (ESPI) fringe pattern based on two-dimensional (2D) continuous wavelet transform is presented. The phase of the fringe pattern is retrieved by detecting the 2D-wavelet ridges. By using a scanning strategy guided by the fringe frequencies,the problem of sign ambiguity could be avoided. The algorithm can deal with open-fringe patterns as well as closed-fringe patterns and it has a strong ability of speckle noise immunity. Simulation and experimental results show that the phase of the ESPI fringe patterns (open-fringe patterns or closed-fringe patterns) can be extracted successfully.
李凯, 张大治, 王晶晶, 张东升, 张青川. 基于二维连续小波变换的ESPI条纹图相位提取方法[J]. 光学学报, 2010, 30(3): 733. Li Kai, Zhang Dazhi, Wang Jingjing, Zhang Dongsheng, Zhang Qingchuan. Phase Extraction of an ESPI Fringe Pattern by Using Two-Dimensional Continuous Wavelet Transform[J]. Acta Optica Sinica, 2010, 30(3): 733.