3 Speckle Noise Reduction and Enhancement for OCT Images
43
Image modeling methods
Spatial Domain
Transform Domain
Data
Adaptive
Transform
Non-data
Adaptive
Transform
*-Translation Domain
(X-lets)
Frequency Domain
contourlets
Scale-translation
Scale-translationfrequency
Translation-durationfrequency
Scale-translationangle
wavelets
wavelet
packets
cosine
packets
wedgelets
geometrical X-lets
curvelets
bandlets
S
T
TN
TD
Dictionary Learning
ICA
Kernel Regression
TD1
TD3
TNF
TNX
DCT
Fourier
TNF1
TNF2
TNX1
TNX2
TNX3
TNX4
TNX11
TNX21
TNX31
TNX41
TNX42
TNX43
TNX44
TNX45
Deterministic
Stochatic
I
I I
III
IV
PDE
Variational
methods
Non-linear
diffusion
IV-1
IV-2
Marginal
Joint
GMM
GSM
RMF
HMM
I-1
I-2
I-11
I-12
I-21
I-22
Geometric
Morphological
Graph based
Deformable
Level set
Active contour
Opening
Dilation
Erosion
Closing
III-1
III-2
III-3
III-21
III-22
III-31
III-32
III-33
III-34
Complex
wavelets
TD4
PCA
TNX12
TD2
TD5
Diffusion map
Fig. 3.2 A classification of various modeling methods [16]