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A comparison between the idealized support of the Fourier spectrum of each standard and complex wavelet in the 3D frequency domain. (a) Isosurfaces of the 7 3D wavelets for a standard 3D wavelet transform. The blue and red colors have the same amplitude, but their phases are complement. (b) Isosurfaces of 7 of the 28 3D wavelets for a 3D DCWT. Each subband corresponds to motion in a specific direction [41].
