<s>
In	O
mathematical	B-Algorithm
morphology	I-Algorithm
,	O
the	O
closing	O
of	O
a	O
set	O
(	O
binary	B-Algorithm
image	I-Algorithm
)	O
A	O
by	O
a	O
structuring	B-Algorithm
element	I-Algorithm
B	O
is	O
the	O
erosion	B-Algorithm
of	O
the	O
dilation	B-Algorithm
of	O
that	O
set	O
,	O
</s>
<s>
where	O
and	O
denote	O
the	O
dilation	B-Algorithm
and	O
erosion	B-Algorithm
,	O
respectively	O
.	O
</s>
<s>
In	O
image	B-Algorithm
processing	I-Algorithm
,	O
closing	O
is	O
,	O
together	O
with	O
opening	B-Algorithm
,	O
the	O
basic	O
workhorse	O
of	O
morphological	O
noise	O
removal	O
.	O
</s>
<s>
Opening	B-Algorithm
removes	O
small	O
objects	O
,	O
while	O
closing	O
removes	O
small	O
holes	O
.	O
</s>
