A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL |
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| Affiliation: | Department of Physics, Nankai University, Tianjin 300071, China; Department of Physics, Branch College of Tianjin University, Tianjin 300193, China; Department of Physics, Neimenggu Normal University, Huhhot 010020, China |
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| Abstract: | The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering. |
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