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GSP_DESIGN_HALF_COSINE - Design uniform half cosine filterbank
Usage
filters = gsp_design_half_cosine( Nf, UBT );
Description
- Inputs parameters:
- G : Graph or maximum value Nf : Number of filters
- Outputs parameters:
- filters : Cell array of filters
This function generates a uniform half cosine filterbank. The main window
\begin{equation*}
\frac{1}{2} \left(1 + \cos\left(2\pi\left(\frac{x}{a}-\frac{1}{2}\right)\right)\right) \text{for } 0 \leq x \leq a
\end{equation*}
is translated uniformaly to create the filterbank.
This function will compute the maximum eigenvalue of the laplacian. To be more efficient, you can precompute it using:
G = gsp_estimate_lmax(G);
Example:
Nf = 8; G = gsp_sensor(100); G = gsp_estimate_lmax(G); g = gsp_design_half_cosine(G, Nf); gsp_plot_filter(G,g);
param is an optional structure containing the following fields
- param.verbose: verbosity level. 0 no log - 1 display warnings. (default 1)