An optical incoherent shadow-casting system based on programmable LEDs arrays is proposed to implement median filtering of binary images.By time-sequential threshold decomposition,this system can perform median filtering of gray-scale images.The system is compact and convenient in changing the median filtering function and thresholding.
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Zhang Jianming, Liu Ying, Liu Fulai, Fang Zhiliang, Lu Mingzhe, Mu Guoguang. OPTICAL MEDIAN FILTERING OF GRAY-SCALE IMAGE WITH PROGRAMMABLE LED ARRAY[J]. Journal of Infrared and Millimeter Waves,1995,14(3):206~210