<s>
Deriche	B-Algorithm
edge	I-Algorithm
detector	I-Algorithm
is	O
an	O
edge	B-Algorithm
detection	I-Algorithm
operator	O
developed	O
by	O
Rachid	O
Deriche	O
in	O
1987	O
.	O
</s>
<s>
It	O
is	O
a	O
multistep	O
algorithm	O
used	O
to	O
obtain	O
an	O
optimal	O
result	O
of	O
edge	B-Algorithm
detection	I-Algorithm
in	O
a	O
discrete	O
two-dimensional	O
image	O
.	O
</s>
<s>
This	O
algorithm	O
is	O
based	O
on	O
John	O
F	O
.	O
Canny	O
's	O
work	O
related	O
to	O
the	O
edge	B-Algorithm
detection	I-Algorithm
(	O
Canny	B-Algorithm
's	I-Algorithm
edge	I-Algorithm
detector	I-Algorithm
)	O
and	O
his	O
criteria	O
for	O
optimal	O
edge	B-Algorithm
detection	I-Algorithm
:	O
</s>
<s>
Deriche	B-Algorithm
edge	I-Algorithm
detector	I-Algorithm
,	O
like	O
Canny	B-Algorithm
edge	I-Algorithm
detector	I-Algorithm
,	O
consists	O
of	O
the	O
following	O
4	O
steps	O
:	O
</s>
<s>
Unlike	O
the	O
Canny	B-Algorithm
edge	I-Algorithm
detector	I-Algorithm
,	O
Deriche	B-Algorithm
edge	I-Algorithm
detector	I-Algorithm
uses	O
the	O
IIR	O
filter	O
in	O
the	O
form	O
:	O
</s>
<s>
As	O
a	O
result	O
,	O
the	O
solution	O
based	O
on	O
the	O
IIR	O
filter	O
is	O
often	O
employed	O
in	O
embedded	O
systems	O
and	O
architectures	O
which	O
support	O
a	O
high	O
level	O
of	O
parallelization	B-Operating_System
.	O
</s>
