基于散斑相位条纹方向的自适应正弦/余弦滤波

An Adaptive Sine/Cosine Filtering Algorithm Based on Speckle Phase Fringe Orientation

结合正弦/余弦(sin/cos)滤波技术提出了依据散斑相位条纹图的条纹方向自动选取滤波窗口大小的自适应滤波法。通过计算散斑包裹相位条纹图的条纹方向,依据相位条纹方向自动选择合适的滤波窗口,对散斑包裹相位图的sin和cos变换图同时进行自适应均值滤波,再通过四象限反正切算法得到包裹相位条纹图。实验结果表明,该滤波法能有效保护条纹相位跳变信息,对于条纹密度变化较大且形状复杂的散斑包裹相位图,仍能进行有效的条纹滤波处理,滤波后的相位条纹图更逼近于原始条纹走向。

Based on the sine/cosine （sin/cos） filtering technique, an adaptive filtering algorithm is proposed. This novel method can automatically select the filtering window size according to the fringe-orientation of the speckle phase fringe pattern. After calculating the fringe- orientation of the speckle wrapped phase fringe pattern, the filtering algorithm can choose an appropriate filtering window accordingly, and carry out adaptive mean filtering operations on sin and cos transformation maps of the speckle wrapped phase pattern, respectively. The wrapped phase fringe pattern is obtained by the four-quadrant arctangent function. Simulation and experimental results show that the proposed method can protect the stripe phase jump information effectively, and still be able to perform a good fringe filtering processing even for the speckle wrapped phase pattern with varying stripe density and complicated fringe shape. The filtered phase pattern is closer to the original stripe direction.