To improve the accuracy of the phase unwrapping for interferogram,a particle-smooth variable structure filtering phase unwrapping algorithm is presented. First,the smooth variable structure filter (SVSF )incorporating residual factors is applied to phase unwrapping for interferogram,and is combined with an efficient local phase gradient estimation technique to construct a particle-smooth variable structure filtering phase unwrapping(PF-SVSFPU)procedure. Second,phase derivative variance map of the interferogram is used as a quality map and embedded into a heapsort-based path-following strategy to guide the working paths of the PF-SVSFPU procedure;Finally,the normalized phase derivative variance map of the interferogram is used to divide the interferogram into three groups of wrapped pixels with different quality levels,and the PF-SVSFPU procedure sequentially unwraps the wrapped pixels along the order of the first quality level group→the second quality level group→the third quality level group to obtain the unwrapped phase of all wrapped pixels of the interferogram. Results delivered by the experiments on synthetic and measured data show that the proposed method can perform phase unwrapping task for interferograms better compared to some representative methods,demonstrating good robustness and effectively improving the accuracy of phase unwrapping for interferograms.
万方数据
维普
