Wavelet Toolbox™

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
  

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