<s>
A	O
chain	B-Algorithm
code	I-Algorithm
is	O
a	O
lossless	B-Algorithm
compression	I-Algorithm
based	O
image	B-Algorithm
segmentation	I-Algorithm
method	O
for	O
binary	B-Algorithm
images	I-Algorithm
based	O
upon	O
tracing	O
image	O
contours	O
.	O
</s>
<s>
Some	O
popular	O
chain	B-Algorithm
codes	I-Algorithm
include	O
:	O
</s>
<s>
Algorithms	O
exist	O
to	O
convert	O
between	O
chain	B-Algorithm
code	I-Algorithm
,	O
crack	O
code	O
,	O
and	O
run-length	B-Algorithm
encoding	I-Algorithm
.	O
</s>
<s>
A	O
new	O
trend	O
of	O
chain	B-Algorithm
codes	I-Algorithm
involve	O
the	O
utilization	O
of	O
biological	O
behaviors	O
.	O
</s>
<s>
Recently	O
,	O
the	O
combination	O
of	O
move-to-front	B-Algorithm
transform	I-Algorithm
and	O
adaptive	O
run-length	B-Algorithm
encoding	I-Algorithm
accomplished	O
efficient	O
compression	O
of	O
the	O
popular	O
chain	B-Algorithm
codes	I-Algorithm
.	O
</s>
<s>
Chain	B-Algorithm
codes	I-Algorithm
also	O
can	O
be	O
used	O
to	O
obtain	O
high	O
levels	O
of	O
compression	O
for	O
image	O
documents	O
,	O
outperforming	O
standards	O
such	O
as	O
DjVu	O
and	O
JBIG2	B-Algorithm
.	O
</s>
