An improved two-dimensional multi-level median filtering algorithm
Ping Kuang, Lei Sun · 2010
The traditional 2-D MLM is often used to protecting images' details, but the algorithm is weak when it is used to suppress image noise particularly image noise with rich details. In order to prove this problem, this paper proposes an improved 2-D MMF algorithm which the number of basic sub-windows is 6 while the number of basic sub-windows is 4 in the traditional 2-D MLM, make sure every pixel can contribute to median value. After done a series of experiments using a set of rich details' fingerprint images in this paper, the results conducted that the ability to protect details in this algorithm almost equal to the traditional two-dimensional multi-level median filter, but the ability to suppress noise in this algorithm is much better than in the traditional one.