<s>
Pansharpening	B-General_Concept
is	O
a	O
process	O
of	O
merging	O
high-resolution	O
panchromatic	O
and	O
lower	O
resolution	O
multispectral	O
imagery	O
to	O
create	O
a	O
single	O
high-resolution	O
color	O
image	O
.	O
</s>
<s>
Google	B-Application
Maps	I-Application
and	O
nearly	O
every	O
map	O
creating	O
company	O
use	O
this	O
technique	O
to	O
increase	O
image	O
quality	O
.	O
</s>
<s>
Pansharpening	B-General_Concept
produces	O
a	O
high-resolution	O
color	O
image	O
from	O
three	O
,	O
four	O
or	O
more	O
low-resolution	O
multispectral	O
satellite	O
bands	O
plus	O
a	O
corresponding	O
high-resolution	O
panchromatic	O
band	O
:	O
</s>
<s>
One	O
common	O
class	O
of	O
algorithms	O
for	O
pansharpening	B-General_Concept
is	O
called	O
“	O
component	O
substitution	O
,	O
”	O
which	O
usually	O
involves	O
the	O
following	O
steps	O
:	O
</s>
<s>
The	O
same	O
steps	O
can	O
also	O
be	O
performed	O
using	O
wavelet	O
decomposition	O
or	O
PCA	B-Application
and	O
replacing	O
the	O
first	O
component	O
with	O
the	O
pan	O
band	O
.	O
</s>
