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CSJ2K.j2k.wavelet.synthesis.SynWTFilter.synthetize_lpf

synthetize_lpf Method

synthetize_lpf(object, int, int, int, object, int, int, int, object, int, int)

Reconstructs the output signal by the synthesis filter, recomposing the low-pass and high-pass input signals in one output signal. This method performs the upsampling and fitering with the low pass first filtering convention.

       <p>The input low-pass (high-pass) signal resides in the lowSig
       array. The index of the first sample to filter (i.e. that will generate
       the first (second) output sample). is given by lowOff (highOff). This
       array must be of the same type as the one for which the particular
       implementation works with (which is returned by the getDataType()
       method).</p><p>The low-pass (high-pass) input signal can be interleaved with other
       signals in the same lowSig (highSig) array, and this is determined by
       the lowStep (highStep) argument. This means that the first sample of
       the low-pass (high-pass) input signal is lowSig[lowOff]
       (highSig[highOff]), the second is lowSig[lowOff+lowStep]
       (highSig[highOff+highStep]), the third is lowSig[lowOff+2*lowStep]
       (highSig[highOff+2*highStep]), and so on. Therefore if lowStep
       (highStep) is 1 there is no interleaving. This feature allows to filter
       columns of a 2-D signal, when it is stored in a line by line order in
       lowSig (highSig), without having to copy the data, in this case the
       lowStep (highStep) argument should be the line width of the low-pass
       (high-pass) signal.</p><p>The output signal is placed in the outSig array. The outOff and
       outStep arguments are analogous to the lowOff and lowStep ones, but
       they apply to the outSig array. The outSig array must be long enough to
       hold the low-pass output signal.</p>
Declaration
public abstract void synthetize_lpf(object lowSig, int lowOff, int lowLen, int lowStep, object highSig, int highOff, int highLen, int highStep, object outSig, int outOff, int outStep)
Parameters
Type Name Description
object lowSig

This is the array that contains the low-pass input signal. It must be of the correct type (e.g., it must be int[] if getDataType() returns TYPE_INT).
int lowOff

This is the index in lowSig of the first sample to filter.
int lowLen

This is the number of samples in the low-pass input signal to filter.
int lowStep

This is the step, or interleave factor, of the low-pass input signal samples in the lowSig array. See above.
object highSig

This is the array that contains the high-pass input signal. It must be of the correct type (e.g., it must be int[] if getDataType() returns TYPE_INT).
int highOff

This is the index in highSig of the first sample to filter.
int highLen

This is the number of samples in the high-pass input signal to filter.
int highStep

This is the step, or interleave factor, of the high-pass input signal samples in the highSig array. See above.
object outSig

This is the array where the output signal is placed. It must be of the same type as lowSig and it should be long enough to contain the output signal.
int outOff

This is the index in outSig of the element where to put the first output sample.
int outStep

This is the step, or interleave factor, of the output samples in the outSig array. See above.