Energy for 1-D wavelet or wavelet packet decomposition
[Ea,Ed]
= wenergy(C,L)
E = wenergy(T)
For a one-dimensional wavelet decomposition [C,L] (see wavedec for details), [Ea,Ed]
= wenergy(C,L) returns Ea, which is
the percentage of energy corresponding to the approximation and Ed,
which is the vector containing the percentages of energy corresponding
to the details.
For a wavelet packet tree T (see wptree, wpdec, wpdec2), E = wenergy( returns
a vector T)E, which contains the percentages of energy
corresponding to the terminal nodes of the tree T.
In this case, wenergy is a method of the wptree object T,
which overloads the previous wenergy function.
% Example 1: 1-D wavelet decomposition
%-------------------------------------
load noisbump
[C,L] = wavedec(noisbump,4,'sym4');
[Ea,Ed] = wenergy(C,L)
Ea =
88.2860
Ed =
2.1560 1.2286 1.4664 6.8630
% Example 2: 1-D wavelet packet decomposition
%--------------------------------------------
load noisbump
T = wpdec(noisbump,3,'sym4');
E = wenergy(T)
E =
95.0329 1.4664 0.6100 0.6408 0.5935 0.5445 0.5154
0.5965