A. Ayache, CONSTRUCTION OF NONSEPARABLE COMPACTLY SU PPORTED ORTHONORMAL WAVELETBASES FOR L-2 (R-2) WITH ARBITRARILY HIGH REGULARITY, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 325(1), 1997, pp. 17-20
Starting from three monodimensional Quadratur Mirror Filters (QMF), we
construct a non-separable bidimensional QMF. Such QMF's will allow us
to obtain non-separable compactly supported orthonormal wavelet bases
of arbitrarily high regularity for L-2 (R-2).