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用二维快速傅里叶变换(2D FFT)方法处理干涉图时,由于该算法只能处理数字化的离散数据,且要求采样的数据序列长度必须是2的n次方,则数据分布区域必须是矩形区域,而一般干涉图的数据范围是圆形域,因此必须设法将圆形区域干涉图扩展延拓成矩形区域。提出了一种基于样本匹配的干涉图延拓的原理和方法,利用该方法对一幅实际干涉图进行了空域延拓,取得了满意的结果。结果表明,该原理方法具有较高的处理精度,为波面相位复原奠定了基础。
When dealing with interferograms using the two-dimensional Fast Fourier Transform (2D FFT) method, since the algorithm can only process digitized discrete data and requires that the length of the sampled data sequence must be n ^ 2, the data distribution area must be Rectangular region, and the data range of the general interferogram is a circular region, so an attempt must be made to extend the circular region interferogram extension into a rectangular region. A principle and method of continuation of the interferogram based on sample matching is proposed. By using this method, a spatial extension of an actual interferogram is achieved, and satisfactory results are obtained. The results show that this principle method has high processing precision and lays the foundation for the phase recovery of wave surface.