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  Indian J Med Microbiol
 

Figure 1: The structure of a two-level decomposition of a discrete wavelet transform (a) and dual-tree complex wavelet transform (b) and the structure of the first wavelet packet of a two-level decomposition of a dual-tree complex wavelet packet transform (c)

Figure 1: The structure of a two-level decomposition of a discrete wavelet transform (a) and dual-tree complex wavelet transform (b) and the structure of the first wavelet packet of a two-level decomposition of a dual-tree complex wavelet packet transform (c)