Before quantization, a decision was made for each subimage of the percentage of coefficients to be retained, which depended on the desired compression ratio. C.K. Chui and C. Li. Non-orthogonal wavelet packets . SIAM J. Math. V 1 W 1 V 2 W 2 V 3 Gamma Gamma Psi R Gamma Gamma Psi R Gamma Gamma Psi R Gamma Gamma Psi R Gamma Gamma Psi R Gamma Gamma Psi R Gamma Gamma Psi R Fig.
Wavelet packets scheme.
The wavelets and the scaling function are related by the well known two scale equations and the associated reconstruction algorithm. C. K. Chui and C. Li. Nonorthogonal wavelet packets . The authors would like to caution readers that there are subtle differences in the meanings of some technical terms used here. C. K. Chui and C. Li.