Institute of Statistical Signal Processing, Department of Electrical Engineering and Information Science, University of Science and Technology of , Hefei 230027, P.R.China;
Institute of Statistical Signal Processing, Department of Electrical Engineering and Information Science, University of Science and Technology of , Hefei 230027, P.R.China;
National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080,P.R.China;
Image fusion; variational approach; perceptual contrast; Weber's law; human visual system (HVS); partial differential equations (PDEs);