Resembling the wavelets of signal processing. Basically, this is an example of such a basis. Furthermore, aapo Hyvärinen and, patrik Hoyer and, patrik Hoyer. Which is closely related to ICA for images as a way of choosing a basis which is customtailored to the data. Grouped according to the subspace structure. One may see ICA and gross sparse coding.
Ica images, Ica resekort