2-D Bases of the Wavelet Subspaces

These are the basis functions to generate the wavelet subspaces of the two dimensional L-2 space. The upper left spans the subspace V, and upper right spans the subspace Vh, the lower left spans the Vv, while the lower right spans the Vd. V represents the lower frequency components, both in vertical and horizontal directions, Vh represents the horizontal lower but vertically higher components, Vv represents the vertical lower but horizontally higher components, while Vd represents the higher frequency features in both directions.

Maintained by Zhaobo Meng