<s>
Moving	B-Algorithm
object	I-Algorithm
detection	I-Algorithm
is	O
a	O
technique	O
used	O
in	O
computer	B-Application
vision	I-Application
and	O
image	O
processing	O
.	O
</s>
<s>
Moving	O
objects	O
detection	O
has	O
been	O
used	O
for	O
wide	O
range	O
of	O
applications	O
like	O
video	O
surveillance	O
,	O
activity	B-Application
recognition	I-Application
,	O
road	O
condition	O
monitoring	O
,	O
airport	O
safety	O
,	O
monitoring	O
of	O
protection	O
along	O
marine	O
border	O
,	O
etc	O
.	O
</s>
<s>
Moving	B-Algorithm
object	I-Algorithm
detection	I-Algorithm
is	O
to	O
recognize	O
the	O
physical	O
movement	O
of	O
an	O
object	O
in	O
a	O
given	O
place	O
or	O
region	O
.	O
</s>
<s>
By	O
acting	O
segmentation	B-Algorithm
among	O
moving	O
objects	O
and	O
stationary	O
area	O
or	O
region	O
,	O
the	O
moving	O
objects	O
 '	O
motion	O
can	O
be	O
tracked	O
and	O
thus	O
analyzed	O
later	O
.	O
</s>
<s>
To	O
achieve	O
this	O
,	O
consider	O
a	O
video	O
is	O
a	O
structure	O
built	O
upon	O
single	O
frames	O
,	O
moving	B-Algorithm
object	I-Algorithm
detection	I-Algorithm
is	O
to	O
find	O
the	O
foreground	O
moving	O
target(s )	O
,	O
either	O
in	O
each	O
video	O
frame	O
or	O
only	O
when	O
the	O
moving	O
target	O
shows	O
the	O
first	O
appearance	O
in	O
the	O
video	O
.	O
</s>
<s>
Among	O
all	O
the	O
traditional	O
moving	B-Algorithm
object	I-Algorithm
detection	I-Algorithm
methods	O
,	O
we	O
could	O
categorize	O
them	O
into	O
four	O
major	O
approaches	O
:	O
Background	B-Algorithm
subtraction	I-Algorithm
,	O
Frame	O
differencing	O
,	O
Temporal	O
Differencing	O
,	O
and	O
Optical	O
Flow	O
.	O
</s>
