<s>
Photo	B-Algorithm
response	I-Algorithm
non-uniformity	I-Algorithm
,	O
pixel	B-Algorithm
response	I-Algorithm
non-uniformity	I-Algorithm
,	O
or	O
PRNU	B-Algorithm
,	O
is	O
a	O
form	O
of	O
fixed-pattern	B-Algorithm
noise	I-Algorithm
related	O
to	O
digital	B-Algorithm
image	I-Algorithm
sensors	I-Algorithm
,	O
as	O
used	O
in	O
cameras	O
and	O
optical	O
instruments	O
.	O
</s>
<s>
Both	O
CCD	B-Algorithm
and	O
CMOS	B-Device
sensors	O
are	O
two-dimensional	O
arrays	O
of	O
photosensitive	O
cells	O
,	O
each	O
broadly	O
corresponding	O
to	O
an	O
image	O
pixel	B-Algorithm
.	O
</s>
<s>
Due	O
to	O
the	O
non-uniformity	O
of	O
image	B-Algorithm
sensors	I-Algorithm
,	O
each	O
cell	O
responds	O
with	O
a	O
different	O
voltage	O
level	O
when	O
illuminated	O
with	O
a	O
uniform	O
light	O
source	O
,	O
and	O
this	O
leads	O
to	O
luminance	O
inaccuracy	O
at	O
the	O
pixel	B-Algorithm
level	O
.	O
</s>
<s>
This	O
table	O
is	O
either	O
carried	O
in	O
camera	O
non-volatile	B-General_Concept
memory	I-General_Concept
and	O
dynamically	O
applied	O
to	O
the	O
image	O
on	O
each	O
capture	O
,	O
or	O
ships	O
with	O
the	O
camera	O
to	O
be	O
applied	O
by	O
an	O
external	O
image	O
processing	O
and	O
correcting	O
pipeline	O
.	O
</s>
