
There might be a feeling of complexity in the
burgeoning world of wavelets. A relatively general multiresolution framework, entitled
MIMOlet (
mee-moh-let), has been proposed by Guillaume Flanders
et al, with a french-dutch-belgian team originating form Lille university. This scheme includes most of the known forms of discrete filter banks, critical or overcomplete, separable or directional. It borrows its name from
MIMO (multi-input, multi-output) systems. More details to be found at
this page (broken link at the time of writing). Its extension to the sphere (
Booldelill et al.) is in progress, as a generalization to
needlets (see for instance
here).