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Energy for 2-D wavelet decomposition


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


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.


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

Ea =

Eh =
    1.8748    2.7360

Ev =
    1.5860    2.6042

Ed =
    0.7539    1.0932

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

Ea =

EDetails =
    4.2147    6.4334

Introduced before R2006a

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