图像增强---中值滤波

http://www.cnblogs.com/BYTEMAN/archive/2012/07/21/2602181.html

http://www.cnblogs.com/Imageshop/p/3907639.html 中值滤波去雾算法

http://blog.sina.com.cn/s/blog_8e6b3fad01016tvu.html

http://www.cnblogs.com/Imageshop/p/3458963.html