ON THE OPTIMALITY OF IDEAL FILTERS FOR PYRAMID AND WAVELET SIGNAL APPROXIMATION

The reconstructed lowpass component in a quadrature mirror filter (QMF ) bank provides a coarser resolution approximation of the input signal . Since the outputs of the two QMF branches are orthogonal, the transf ormation that provides the maximum energy compaction in the lowpass ch annel is also the one that results in the minimum approximation error. This property is used as a common strategy for the optimization of QM F banks, orthogonal wavelet transforms, and least squares pyramids. A general solution is derived for the QMF bank that provides the optimal decomposition of an arbitrary wide sense stationary process. This app roach is extended to the continuous case to obtain the minimum error a pproximation of a signal at a given sampling rate. In particular, it i s shown that the sine-wavelet transform is optimal for the representat ion at all scales of signals with non-increasing spectral density.