wenergy2

Energy for 2-D wavelet decomposition

Syntax

[Ea,Eh,Ev,Ed] = wenergy2(C,S)
[Ea,EDetail] = wenergy2(C,S)

Description

For a two-dimensional wavelet decomposition [C,S] (see wavedec2 for details), [Ea,Eh,Ev,Ed] = wenergy2(C,S) returns Ea, which is the percentage of energy corresponding to the approximation, and vectors Eh, Ev, Ed, which contain the percentages of energy corresponding to the horizontal, vertical, and diagonal details, respectively.

[Ea,EDetail] = wenergy2(C,S) returns Ea, and EDetail, which is the sum of vectors Eh, Ev, and Ed.

Examples

load detail
[C,S] = wavedec2(X,2,'sym4');
[Ea,Eh,Ev,Ed] = wenergy2(C,S)

Ea =
   89.3520

Eh =
    1.8748    2.7360

Ev =
    1.5860    2.6042

Ed =
    0.7539    1.0932

[Ea,EDetails] = wenergy2(C,S)

Ea =
   89.3520

EDetails =
    4.2147    6.4334
Introduced before R2006a

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