摘要
在分析傅里叶相位展开法中存在的一阶频谱定位误差的基础上，尤其针对实际工作中非严格均匀参考条纹干涉图的相位展开问题，提出基于伽柏（Ｇａｂｏｒ）小波的局域匹配滤波方法，构造多通道伽柏滤波器，得到在Ｍａｌａｔ极大模意义下的最佳匹配相位。同时也较好地实现了噪声及遮挡物的去除。通过对模拟的和真实的干涉图的波前重建，证实本方法在处理非平行等间距参考条纹图象及畸变严重的干涉图时，优于通常的傅里叶相位展开法。
On the basis of localization error of the first order frequency spectrum associated
with interferogram phase unwrapping by Fourier transform method, especially aimed at phase
unwrapping for practical interferograms with nonstrictly parallel and equally spaced references,
a method of localized matching filtering using Gabor wavelets is proposed. Multi channel
Gabor spatial filter set is constructed to get the best matched local spatial frequency in meaning
of Mallat maximum modulo. At the same time noises and opaque objects can be removed. The
method is proved more effective than conventional Fourier transform method for cases of
nonequally spaced references and seriously deformed fringes by applying it to simulated and
real interferograms to reconstruct interferometric wave fronts.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1999年第6期805-810,共6页
Acta Optica Sinica
关键词
伽柏变换
相位展开
干涉图分析
波前重建
Gabor transform,
phase unwrapping, interferogram analysis, wave front reconstruction.
