Hello all,
As a part of my masters thesis, I am working on Entropy alpha implementation on a Satellite data using MATLAB. I have referred to the papers written Cloude and pottier. But I was not able to find the way to obtain the entropy-alpha classification plane in MATLAB.
Thanks in advance.
Pavan.
function Ent = CalcEntropy(object,Entropy,par)
% CalcEntropy -- Calculate entropy number of array
% Usage
% Ent = CalcEntropy(object,ent[,par])
% Inputs
% object 1-d or 2-d object
% ent type of entropy to use: options are
% 'Entropy' -- Coifman-Wickerhauser
% 'Log' -- sum log(|th_i|)
% 'l^p' -- sum |th_i|^p, 0 < p < 2, p = par
% 'N(eps)' -- #>= eps, eps = par
% 'Risk' -- sum min(th_i^2,eps^2), eps=par
% 'Sum' -- sum th_i
% 'SURE' -- SURE(Thresholding), thresh = par
% par extra parameter, depends on type of entropy
% Outputs
% Ent Entropy of object
%
% Description
% It is traditional to normalize the object to norm 1 before
% calling this routine. This routine does NO pre-scaling.
%
% See Also
% Calc2dStatTree
%
if strcmp(Entropy,'Entropy'),
p = (object(:) ).^2;
Ent = - sum(sum(p .* log(eps+p)));
elseif strcmp(Entropy,'Log')
p = abs(object(:) );
Ent = sum(log(eps+p));
elseif strcmp(Entropy,'l^p'),
% par = p = exponent
p = abs(object(:) );
Ent = sum(p .^par);
elseif strcmp(Entropy,'N(eps)'),
% par = eps
p = abs(object(:));
Ent = sum( p > par );
elseif strcmp(Entropy,'Risk'),
p = object(:).^2;
Ent = sum(min(p,par^2));
elseif strcmp(Entropy,'Sum'),
p = object(:);
Ent = sum(p);
elseif strcmp(Entropy,'SURE'),
tt = par^2; % par = threshold
dim = length(object(:));
p = object(:).^2;
ngt = sum( p > tt);
nlt = dim - ngt;
slt = sum( p .* ( p
Hello.
Thrall have two pamphlets on teaching MATLAB. Send your service
wish you luck
www.mccormick.northwestern.edu/documents/students/undergraduate/introduction-to-matlab.pdf
web.njit.edu
Dear Pavan Kumar Akula,
Do you know PolSARpro open source software ? it is develpped by Mr. Pottier and his team. Then you can find all that you need for understand his entropy/alpha method (tutorial, code, implementation,etc).
Download :https://earth.esa.int/web/polsarpro/download/version-5.0
Tutorials: https://earth.esa.int/web/polsarpro/polarimetry-tutorial
Best regards,
Luz
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