A contrast enhancement algorithm of interference fringes based on 2-D DFT
LU Shao-jun · Information technology newsletter · 2008
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 enchanced.The results show that the algorithm can efficiently enhance the contrast of fringes without changing the space position centers of interference fringes.