updated 05-20-01

some matlab scripts:

builds an image from the rgb component matrices
buildImage

takes 3 component matrices and builds one 3XN matrix
that represents a multivariate distribution (matrix of observations). 
buildItUp

opposite of above
tearItDown

Takes a vector representing a discrete probability density function (PDF)
and returns the cumulative density function (CDF)  
cdf

Takes a vector and builds a circulent matrix using this vector as the 
first column. 
circ

Takes a matrix representing the joint probability distribution of two
discrete random variables X(rows) Y(cols) and returns conditional 
information  Hx|y and Hy|x 
cp

Takes an integer argument (N) and returns a Fourier transform matrix of 
size N 
ftm

Takes an integer argument (N) and returns a low pass filter of length N
H0

Takes an integer argument (N) and returns a high pass filter of length N
H1

Takes an integer argument (N) and a vector representing a PDF, returns
a vextor of length N representing the value of the inverse CDF at N equally
spaced points between 0 and 1.
inv_CDF

takes a pair of images of equal size and returns the 2d joint histogram.
joint_h

Takes a matrix and its covariance matrix and returns the KL transform
KL

takes a matrix representing a joint histogram returns the marginal 
histograms  Hx  and  Hy
marg

Takes a pair of images and returns the mutual information Ixy
MI

Normalizes a matrix (returns values between 0 and 1)
myNorm

Takes a vector p representing a 1D PDF and an integer N, returns a NxN 
matrix of random numbers with the distribution p
rand2

Downsamples a vector. 
downsample

Upsamples a vector inserting zeros.
upsample


A script that simulates two channel subband codling based on the "ideal"
lower (H0) and upper (H1) filters.
subband coding script


A script takes the rgb components of an image and treats them as samples 
of a 3x1 vector random variable, computes the zero mean image, computes 
the covariance matrix, uses the eigenvectors to decorrelate rgb ( the 
KL transform ) rebuilds and displays new image.
decorrelate script




 MAIN