基于傅里叶变换的干涉条纹对比度增强算法

论述了一种干涉条纹对比度增强的算法.将二维离散傅里叶变换后得到的干涉条纹图像频谱分布,应用带通滤波器滤波.滤波过程中,在保持通带内相位谱不变的条件下,增大了通带内幅频谱的值.然后对滤波后的频谱分布进行逆二维离散傅里叶变换,可得到对比度增强后的干涉条纹图像.实验表明,该方法在保持干涉条纹中心线空间位置不变的情况下,可以有效地增强干涉条纹的对比度.

A contrast enhancement algorithm of interference fringes based on 2-D DFT

The paper discusses on a contrast enhancement algorithm of interference fringe pattern,which includes following three steps:spectrum of interference fringe pattern is obtained by two-Dimensional Discrete Fourier Transform(DFT),then filters with bandpass filter;during filtering,the phases spectrum in the bandpass remains no change,the values of amplitude spectrum are amplified;the spectrum after filtering is transformed by 2-D reverse DFT to obtain the interference fringe pattern,whose contrast has been ench...