<s>
A	O
standard	B-Algorithm
test	I-Algorithm
image	I-Algorithm
is	O
a	O
digital	O
image	O
file	O
used	O
across	O
different	O
institutions	O
to	O
test	B-Algorithm
image	I-Algorithm
processing	O
and	O
image	B-General_Concept
compression	I-General_Concept
algorithms	O
.	O
</s>
<s>
By	O
using	O
the	O
same	O
standard	B-Algorithm
test	I-Algorithm
images	I-Algorithm
,	O
different	O
labs	O
are	O
able	O
to	O
compare	O
results	O
,	O
both	O
visually	O
and	O
quantitatively	O
.	O
</s>
<s>
Other	O
test	B-Algorithm
images	I-Algorithm
are	O
chosen	O
because	O
they	O
present	O
a	O
range	O
of	O
challenges	O
to	O
image	O
reconstruction	O
algorithms	O
,	O
such	O
as	O
the	O
reproduction	O
of	O
fine	O
detail	O
and	O
textures	O
,	O
sharp	O
transitions	O
and	O
edges	O
,	O
and	O
uniform	O
regions	O
.	O
</s>
<s>
Test	B-Algorithm
images	I-Algorithm
as	O
transmission	O
system	O
calibration	O
material	O
probably	O
date	O
back	O
to	O
the	O
original	O
Paris	O
to	O
Lyon	O
fax	O
link	O
.	O
</s>
<s>
The	O
standard	O
resolution	B-Algorithm
of	O
the	O
images	O
is	O
usually	O
512×512	O
or	O
720×576	O
.	O
</s>
<s>
Most	O
of	O
these	O
images	O
are	O
available	O
as	O
TIFF	O
files	O
from	O
the	O
University	O
of	O
Southern	O
California	O
's	O
Signal	O
and	O
Image	B-Algorithm
Processing	I-Algorithm
Institute	O
.	O
</s>
<s>
Kodak	O
has	O
released	O
768×512	O
images	O
,	O
available	O
as	O
PNGs	O
,	O
that	O
was	O
originally	O
on	O
Photo	O
CD	O
with	O
higher	O
resolution	B-Algorithm
,	O
that	O
are	O
widely	O
used	O
for	O
comparing	O
image	B-General_Concept
compression	I-General_Concept
techniques	O
.	O
</s>
