These filters may boil down to solving nonlinear diffusion equations with initial values being input images.
这些非线性图像滤波大多源于求解初始值为输入图像的非线性扩散方程。
Stained quartz glass for filters has been made by ion diffusion under high-tension electric field. The equipment and process are described.
利用高压电场离子扩散法试制滤光石英玻璃，介绍了该法的装置与工艺。
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