SHOWWP -- shows wavelet packet coefficients and many other things
showwp(w, h, g)
showwp(w, f, h, g)
Displays the tree of the wavelet packet coefficients in w. f is
the original vector (possibly an empty vector). If any selections
are made, the selected packets are made to stand out. Both f and
selection are optional.
The display is divided into two parts: in the top part is the tree
of the wavelet packet coefficients, the bottom part is used for
graphing other things.
The original vector is the very first row of the tree. Here white
means large values, black small (possibly) negative values.
The wavelet packet coefficients form the rest of tree. The left
branches are the result of convolution-decimation with the low
pass filter (scaling function), right branches with the high pass
filter (wavelet). Here only the absolute values of the
coefficients are drawn: white means large absolute value, black
means zero.
Clicking in a box on the first row shows the original vector,
clicking in any other box shows the graph of the wavelet packet
corresponding to that box.
Select menu:
Packet toggle the selected/unselected state of a
single packet
Group toggle the selected/unselected state of a box
Fixed level click anywhere in the tree to select a level
Wavelet basis selects the wavelet basis
Best level selects the level with lowest cost
Best basis selects the basis with lowest cost
Clear clears all selections
Action menu:
Inverse transform computes the inverse transform using
current selection
Phaseplane plot displays the phaseplane plot for the
currently selected basis
Nonincreasing rearrengement
displays the nonincreasing rearrengement
of the wavelet packet coefficients
Compute cost displays the cost of various things
Discard menu:
Discards all coefficients whose absolute value is less than the
selected percentage of the L2-norm of the whole collection of
wavelet packet coefficients.
Options menu:
Set cost function allows to select the cost function
Show cost function shows which cost function is being used
Natural order switches the display to natural order
Sequency order switches the display to sequency order
--> Color switches the display to color
--> B/W switches the display to black and white
See also PHASEPLN, WMENU, WPDEMO, WPA1, WPS1, BESTBASE, BESTLEVL,
FIXLEVEL, WAVBASIS.