Cite this article:
LIU SI-MIN, LU YI, CHEN HAI-DONG, LIU JUN-MIN, XU JING-JUN, ZHANG GUANG-YIN, YANG LI-SEN, MEN LI-QIU, SUN QIAN. A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTALJ. Chin. Phys. B, 1994, 3(7): 506-511.
LIU SI-MIN, LU YI, CHEN HAI-DONG, LIU JUN-MIN, XU JING-JUN, ZHANG GUANG-YIN, YANG LI-SEN, MEN LI-QIU, SUN QIAN. A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTALJ. Chin. Phys. B, 1994, 3(7): 506-511.
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A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL
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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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