<s>
is	O
an	O
orientation-selective	O
convolution	B-Algorithm
kernel	I-Algorithm
used	O
for	O
image	O
enhancement	O
and	O
feature	O
extraction	O
that	O
can	O
be	O
expressed	O
via	O
a	O
linear	O
combination	O
of	O
a	O
small	O
set	O
of	O
rotated	O
versions	O
of	O
itself	O
.	O
</s>
<s>
As	O
an	O
example	O
,	O
the	O
oriented	O
first	O
derivative	O
of	O
a	O
2D	O
Gaussian	O
is	O
a	O
steerable	B-Algorithm
filter	I-Algorithm
.	O
</s>
<s>
Applications	O
of	O
steerable	B-Algorithm
filters	I-Algorithm
include	O
edge	B-Algorithm
detection	I-Algorithm
,	O
oriented	O
texture	O
analysis	O
and	O
shape	O
from	O
shading	O
.	O
</s>
<s>
Steerable	B-Algorithm
filters	I-Algorithm
may	O
be	O
designed	O
as	O
approximations	O
of	O
a	O
given	O
filter	O
shape	O
up	O
to	O
a	O
desired	O
error	O
or	O
computational	O
complexity	O
.	O
</s>
