Node usage

The help_TimeScalePlotMatrix node creates a matrix representing the scale-space of the original 1D profile. Note that since the fast wavelet transform (FWT) makes use of dyadic downsampling, each scale vector going from the highest to the lowest resolution will at each step half in size compare to the previous one. This ensures the total number of wavelet coefficients is the same as the total number of elements in the original data vector, i.e. we have a non-redundant transform. The matrix created by this node can be visualised with the ``image'' plot type, see Figure 1.

These are node arguments:

Input ports:

W: matrix which contains the wavelet coefficient vector for each profile (e.g. infrared spectrum) in each row

Input arguments:

row: This is an integer indicating which row in the W coefficient matrix will be visualised

Output ports:

Xh: which is a matrix where each row has been reconstructed according to the input wavelet coefficient matrix W

SEE ALSO: WaveletTransform which produces W coefficient matrices this routine can visualise.



Source: This node is using tools from the WavelLab toolbox which can be downloaded from http://www-stat.stanford.edu/~wavelab/

Figure 1: Here is a scale space plot generated by using the ``image'' plot function on the output matrix from TimeScalePlotMatrix node
\includegraphics[width=5.0cm]{figures/scale-space-plot-1.eps}

Bjørn Kåre Alsberg 2006-04-06