Multilevel reconstruction algorithms.
An example of a three-level signal reconstruction algorithm is shown in Figure
"Three-Level Discrete Wavelet Reconstruction"
. The scheme corresponds to the decomposition scheme described in the section of the description of the forward transform function
. Therefore, for the inverse transform the biorthogonal set of spline filters with respective filter length of 6 and 2 is used. The lowest level filter delays are set to
= 0. The total delay at this stage of reconstruction is equal to two samples. In order to ensure an equivalent delay of the “detail” part in the middle level, the delay must be increased. Respective values of additional delays for the second level are equal to
+ 2*2 = 4. A greater value of high frequency component delay needs to be selected for the last level of reconstruction,
+ 2*4 = 12.