<s>
GrabCut	B-Algorithm
is	O
an	O
image	B-Algorithm
segmentation	I-Algorithm
method	O
based	O
on	O
graph	B-Algorithm
cuts	I-Algorithm
.	O
</s>
<s>
Starting	O
with	O
a	O
user-specified	O
bounding	B-Algorithm
box	I-Algorithm
around	O
the	O
object	O
to	O
be	O
segmented	O
,	O
the	O
algorithm	O
estimates	O
the	O
color	O
distribution	O
of	O
the	O
target	O
object	O
and	O
that	O
of	O
the	O
background	O
using	O
a	O
Gaussian	O
mixture	O
model	O
.	O
</s>
<s>
As	O
this	O
estimate	O
is	O
likely	O
to	O
be	O
more	O
accurate	O
than	O
the	O
original	O
,	O
taken	O
from	O
the	O
bounding	B-Algorithm
box	I-Algorithm
,	O
this	O
two-step	O
procedure	O
is	O
repeated	O
until	O
convergence	O
.	O
</s>
<s>
There	O
are	O
several	O
open	B-License
source	I-License
implementations	O
available	O
including	O
OpenCV	B-Language
(	O
as	O
of	O
version	O
2.1	O
)	O
.	O
</s>
