说明：  粗糙集理论是一种描述不确定知识的工具，在图像处理中具有广泛用途，本代码给出了粗糙集滤波和边缘提取的简单实现
(Rough set theory is a description of uncertain knowledge of the tools in image processing with a wide range of applications, the code gives the rough set filtering and edge detection of the simple realization)