Hybrid wavelet packet analysis

Performance of any transform in a particular application is highly dependent on the basis functions chosen. The choice of quadrature mirror filters (QMF) used in a wavelet packet analysis should be taken into consideration in a compression scheme. The choice of appropriate QMF is not only signal dependent, but scale dependent within a given signal. A generalization, known as hybrid wavelet packet analysis, which includes the choice of optimal QMF at each level of decomposition is explored. Computational results show that optimized hybrid wavelet packet bases provide better compression for a class of signals and indicate methods to develop search strategies to find these optimal bases