Draw mother wavelet associated with an imwdc object.
This function draws the mother wavelet associated with an imwdc.object — a compressed two-dimensional wavelet decomposition.
## S3 method for class 'imwdc' draw(wd, resolution=128, ...)
wd |
The |
resolution |
The resolution at which the computation is done to compute the wavelet picture. Generally the resolution should be lower for two-dimensional wavelets since the number of computations is proportional to the square of the resolution (the DWT is still O(n) though). |
... |
Additional arguments to pass to the |
This function extracts the filter component from the imwd object (which is constructed using the filter.select function) to decide which wavelet to draw. Once decided the draw.default function is used to actually do the drawing.
If the plot.it argument is set to TRUE then nothing is returned. Otherwise, as with draw.default, the coordinates of what would have been plotted are returned.
Version 2 Copyright Guy Nason 1993
If the plot.it argument is TRUE (which it is by default) a plot of the mother wavelet or scaling function is plotted on the active graphics device.
G P Nason
# # Let's use the lennon test image # data(lennon) ## Not run: image(lennon) # # Now let's do the 2D discrete wavelet transform using Daubechies' # least-asymmetric wavelet N=6 # lwd <- imwd(lennon, filter.number=6) # # Now let's threshold the 2D DWT # The resultant class of object is imwdc object. # lwdT <- threshold(lwd) # # And now draw the wavelet that did this transform # ## Not run: draw(lwdT) # # A nice little two-dimensional wavelet! #
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.