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Wavelab Toolbox >> Wavelab Toolbox > 2-d Wavelet- and Cosine- Packet Tools > CalcEntropy

CalcEntropy

Calculate entropy number of array

Calling Sequence

Ent = CalcEntropy(object,ent[,par])

Parameters

Inputs:

object:

1-d or 2-d object

ent :

type of entropy to use: options are

ent = 'Entropy':

-- Coifman-Wickerhauser

ent = 'Log' :

-- sum log(|th_i|)

ent = 'l^p' :

-- sum |th_i|^p, 0 < p < 2, p = par

ent = 'N(eps)' :

-- #>= eps, eps = par

ent = 'Risk' :

-- sum min(th_i^2,eps^2), eps=par

ent = 'Sum' :

-- sum th_i

ent = '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

Authors

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