<s>
(	O
sometimes	O
known	O
as	O
just	O
wavelet	B-Algorithm
packets	I-Algorithm
or	O
subband	O
tree	O
)	O
,	O
is	O
a	O
wavelet	O
transform	O
where	O
the	O
discrete-time	O
(	O
sampled	O
)	O
signal	O
is	O
passed	O
through	O
more	O
filters	O
than	O
the	O
discrete	O
wavelet	O
transform	O
(	O
DWT	O
)	O
.	O
</s>
<s>
However	O
,	O
due	O
to	O
the	O
downsampling	B-Algorithm
process	O
the	O
overall	O
number	O
of	O
coefficients	O
is	O
still	O
the	O
same	O
and	O
there	O
is	O
no	O
redundancy	O
.	O
</s>
<s>
There	O
are	O
several	O
algorithms	O
for	O
subband	O
tree	O
structuring	O
that	O
find	O
a	O
set	O
of	O
optimal	O
bases	O
that	O
provide	O
the	O
most	O
desirable	O
representation	O
of	O
the	O
data	O
relative	O
to	O
a	O
particular	O
cost	O
function	O
(	O
entropy	B-Algorithm
,	O
energy	O
compaction	O
,	O
etc	O
.	O
</s>
<s>
regular	O
,	O
dyadic	O
,	O
irregular	O
,	O
with	O
respect	O
to	O
performance	O
metrics	O
of	O
interest	O
including	O
energy	O
compaction	O
(	O
entropy	B-Algorithm
)	O
,	O
subband	O
correlations	O
and	O
others	O
.	O
</s>
<s>
Wavelet	B-Algorithm
packets	I-Algorithm
were	O
successfully	O
applied	O
in	O
preclinical	O
diagnosis	O
.	O
</s>
