Lifting Scheme can be used to calculate Discrete Wavelet Transform (DWT) efficiently.It is composed of a number of lifting steps and the scaling transform.When it is used to calculate multi-level and multidimensional DWT
there exist many redundant multiplications.In this paper we propose
a new technique
called Post-Scaling Lifting Algorithm (PSLift)
which needs fewer multiplications.The basic idea is first to calculate all lifting steps of each level and each dimensional DWT
and then calculate the scaling tranform.For example
when five level decompositions are implemented for Daubechies 9/7 biorthogonal wavelet
compared to the known methods
the number of multiplication needed is reduced by 20% and 28% compared to one dimensional DWT and two dimensional DWT.