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Fast Fourier transform and its applications

YANG Li-juan1, ZHANG Bai-hua2, YE Xu-zhen1 (1. College of Physics Science and Technology, Sichuan University, Chengdu 610064, China; 2. College of Mechanics and Electricity, Lanzhou University of Science and Technology, Lanzhou 730050, China )  
A lot of algorithms such as fast convolution and targets identification can be easily performed through converting image signal from spatial domain to frequency domain and by means of Fast Fourier Transform (FFT). Filtering processing for eliminating low-frequency disturbance and noise signal is carried out by Butterworth band pass filter and 2-D Wiener filter according to gray scale structural behavior and spectrum distribution of the image signal. The signal can be restored by Fourier inversion. The results show that after processing the photo of the simulated remote high-altitude secondary planet can be seen clearly.
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