电子科发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 3.Estimation of Noise Parameters a bc FIGURE 5.6 Histograms computed using small strips (shown as inserts)from (a)the Gaussian,(b)the Rayleigh,and (c)the uniform noisy images in Fig.5.4. 五= ：n(e.2-e-旷p(e) i=0 i=0
3. Estimation of Noise Parameters ( ) ( ) ( ) 1 1 2 2 0 0 , L L i s i i s i i i z z p z z z p z − − = = = = −
电子转发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC Outline A Model of the Image Degradation/Restoration Process Noise Models Restoration in the Presence of Noise Only-Spatial Filtering Periodic Noise Reduction by Frequency Domain Filtering Linear,Position-Invariant Degradations ◆ Estimating the Degradation Function Inverse Filtering Minimum Mean Square Error (Wiener)Filtering Constrained Least Squares Filtering Geometric Mean Filter Image Reconstruction from Projections*
Outline ◆ A Model of the Image Degradation/Restoration Process ◆ Noise Models ◆ Restoration in the Presence of Noise Only-Spatial Filtering ◆ Periodic Noise Reduction by Frequency Domain Filtering ◆ Linear, Position-Invariant Degradations ◆ Estimating the Degradation Function ◆ Inverse Filtering ◆ Minimum Mean Square Error (Wiener) Filtering ◆ Constrained Least Squares Filtering ◆ Geometric Mean Filter ◆ Image Reconstruction from Projections*
电子转发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 5,3 Restoration in the Presence of Noise Only- Spatial Filtering g(x.y)=h(x,y)*f(x.y)+n(x.y) G(u,v)=H(u,v)F (u,v)+N (u,v) When the only degradation present in an image is noise, 8(x,y)=f(x,y)+n(x,y) Spatial Filtering G(u,)=F(u,)+N(u,)
◼ When the only degradation present in an image is noise, 5.3 Restoration in the Presence of Noise OnlySpatial Filtering g x y h x y f x y x y ( , , , , ) = + ( ) ( ) ( ) G u v H u v F u v N u v ( , , , , ) = + ( ) ( ) ( ) g x y f x y x y ( , , , ) = + ( ) ( ) G u v F u v N u v ( , , , ) = + ( ) ( ) Spatial Filtering
电子转发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 5,3 Restoration in the Presence of Noise Only- Spatial Filtering Agenda 百 Mean Filters Order-Statistic Filters Adaptive Filters Agenda
Mean Filters Order-Statistic Filters Adaptive Filters 5.3 Restoration in the Presence of Noise OnlySpatial Filtering Agenda
电子转线女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 1.Mean Filters Arithmetic mean filter Geometric mean filter Harmonic mean filter 百( Contraharmonic mean filter
Arithmetic mean filter Geometric mean filter Harmonic mean filter Contraharmonic mean filter 1. Mean Filters