基于Gabor滤波的散斑条纹图平滑方法

Speckle Fringe Pattern Smoothing Method Based on Gabor Filtering

提出了一种基于伽博(Gabor)滤波的散斑条纹图平滑方法。通过加窗傅里叶运算提取散斑条纹图的条纹频率和条纹梯度方向,并利用它们确定具有频率和方向选择性的Gabor滤波器对散斑条纹图进行Gabor滤波。数值模拟和实验结果表明,该方法在滤除散斑噪声的同时能够有效的保留散斑条纹图的条纹结构,为从单幅散斑条纹图中进一步提取条纹相位场奠定了良好的基础。

A method based on Gabor filtering for speckle fringe pattern smoothing is presented. The fringe frequencies and fringe gradient orientation of the speckle fringe pattern are obtained by windowed Fourier operation. The Gabor filters with the particular frequencies and orientation are then determined and applied to smooth the speckle fringe pattern. Simulation and experimental results show that the speckle noise in the speckle fringe patterns is removed efficiently as well as the fringe structure is well-preserved. This method provides a good basis for further extracting fringe phase field from one speckle fringe pattern.