<s>
A	O
gigapixel	O
macro	O
image	O
is	O
a	O
digital	B-Algorithm
image	I-Algorithm
bitmap	O
composed	O
of	O
one	O
billion	O
(	O
109	O
)	O
pixels	O
(	O
picture	O
elements	O
)	O
,	O
or	O
1000	O
times	O
the	O
information	O
captured	O
by	O
a	O
1	O
megapixel	O
digital	B-Device
camera	I-Device
.	O
</s>
<s>
Creating	O
such	O
high-resolution	O
images	O
involves	O
making	O
mosaics	O
(	O
image	B-Algorithm
stitching	I-Algorithm
)	O
of	O
a	O
large	O
number	O
of	O
high-resolution	O
digital	O
photographs	O
which	O
are	O
then	O
combined	O
into	O
a	O
single	O
image	O
.	O
</s>
<s>
Gigapixel	O
macro	O
images	O
are	O
made	O
by	O
'	O
stacking	B-Algorithm
 '	O
a	O
number	O
of	O
photographs	O
together	O
in	O
order	O
to	O
increase	O
the	O
depth	O
of	O
field	O
and	O
then	O
stitching	B-Algorithm
the	O
resulting	O
images	O
together	O
in	O
a	O
technique	O
known	O
as	O
'	O
stack	O
and	O
stitch	O
 '	O
.	O
</s>
<s>
To	O
make	O
such	O
images	O
accessible	O
,	O
they	O
are	O
converted	O
using	O
tiled	B-Application
image	I-Application
techniques	I-Application
so	O
that	O
they	O
may	O
be	O
viewed	O
in	O
a	O
web	O
browser	O
.	O
</s>
<s>
Google	B-Application
Maps	I-Application
.	I-Application
</s>
