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In the previous sections, we only considered the case where a single graph spectral filter was applied. Several image processing applications, such as compression and restoration, often require multiple filters that have different passbands (typically low-pass and high-pass). This signal processing system – so-called filter banks – is also important for GSP. In this section, the spectral domain design of graph filter banks is briefly introduced.

Figure 1.4. Framework of graph filter bank