: the coefficients of the discrete wavelet transform. If you need to access or modify the approximation coefficients or any specific set of detail coefficients then the use of
is recommended. For completeness the following description provides details of precisely how the coefficients are stored in
but this information should only be required in rare cases.
The
$8$ sets of coefficients are stored in the following order: approximation coefficients (LLL) first, followed by
$7$ sets of detail coefficients: LLH, LHL, LHH, HLL, HLH, HHL, HHH, where L indicates the low pass filter, and H the high pass filter being applied to, respectively, the columns of length
m, the rows of length
n and then the frames of length
fr. Note that for computational efficiency reasons each set of coefficients is stored in the order
${n}_{\mathrm{cfr}}\times {n}_{\mathrm{cm}}\times {n}_{\mathrm{cn}}$ (see output arguments
nwcfr,
nwct and
nwcn in
c09acf). See
Section 10 for details of how to access each set of coefficients in order to perform extraction from
c following a call to this routine, or insertion into
c before a call to the three-dimensional inverse routine
c09fbf.