Institute of Information Science;
Beijing Jiaotong University;
Beijing 100044;
China;
Shandong Province Key Laboratory of Medical Physics and Image Processing Technology;
School of Physics and Electronics;
Shandong Normal University;
Jinan 250014;
China;
synthetic aperture radar(SAR)image de-noising; local pixel grouping(LPG); principal component analysis(PCA); guided filter;