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Experimental study of spatial filtering

YU Xue-bing;WANG Wei;School of Physics,Northeast Normal University;National Demonstration Center for Experimental Physics Education(Northeast Normal University),Northeast Normal University;  
The Fourier transform of lens and the spectrum of object in the Abbe-Porter experiment and spatial filtering were discussed in space domain and frequency domain.The process of frequency division and frequency mixing in object imaging was studied,and the influence of lens aperture on the experiment of spatial filtering was analyzed.The image processing techniques,such as low-pass filter,directional filter and color filter were simulated by Matlab,and the Babinet principle in Fraunhofer diffraction was verified.
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