<s>
The	O
Nokia	B-Language
808	I-Language
PureView	I-Language
is	O
a	O
Symbian-powered	O
smartphone	B-Application
first	O
unveiled	O
on	O
27	O
February	O
2012	O
at	O
the	O
Mobile	O
World	O
Congress	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
smartphone	B-Application
to	O
feature	O
Nokia	O
's	O
PureView	B-Device
Pro	O
technology	O
,	O
a	O
pixel	B-Algorithm
oversampling	B-General_Concept
technique	O
that	O
reduces	O
an	O
image	O
taken	O
at	O
full	O
resolution	O
into	O
a	O
lower	O
resolution	O
picture	O
,	O
thus	O
achieving	O
higher	O
definition	O
and	O
light	O
sensitivity	O
,	O
and	O
enables	O
lossless	O
digital	B-Algorithm
zoom	I-Algorithm
.	O
</s>
<s>
The	O
Nokia	B-Language
808	I-Language
features	O
a	O
41MP	O
1/1.2in	O
(	O
10.67	O
×	O
8mm	O
)	O
sensor	O
and	O
a	O
high-resolution	O
f/2.4	O
Zeiss	O
all-aspherical	O
1-group	O
lens	O
.	O
</s>
<s>
The	O
808	O
's	O
sensor	O
was	O
the	O
largest	O
(	O
over	O
4	O
times	O
larger	O
than	O
typical	O
compact	B-Algorithm
cameras	I-Algorithm
)	O
sensor	O
ever	O
to	O
be	O
used	O
in	O
a	O
cameraphone	O
at	O
the	O
time	O
of	O
its	O
launch	O
,	O
a	O
record	O
previously	O
held	O
by	O
Nokia	O
's	O
N8	B-Language
and	O
,	O
as	O
of	O
September	O
2014	O
,	O
by	O
the	O
Panasonic	B-Algorithm
Lumix	I-Algorithm
CM1	I-Algorithm
.	O
</s>
<s>
As	O
of	O
2023	O
,	O
despite	O
larger	O
1	O
"	O
sensors	O
and	O
AI	O
processing	O
modern	O
cameraphones	O
ca	O
n’t	O
provide	O
resolution	O
better	O
than	O
Nokia	B-Device
PureView	I-Device
808	O
at	O
least	O
in	O
broad	O
daylight	O
.	O
</s>
<s>
On	O
24	O
January	O
2013	O
,	O
Nokia	O
officially	O
confirmed	O
the	O
808	B-Language
Pureview	I-Language
to	O
be	O
the	O
last	O
Symbian	B-Operating_System
smartphone	B-Application
.	O
</s>
<s>
In	O
July	O
2013	O
,	O
Nokia	O
released	O
the	O
Lumia	B-Device
1020	I-Device
,	O
a	O
successor	O
running	O
the	O
Windows	B-Protocol
Phone	I-Protocol
operating	O
system	O
common	O
to	O
Nokia	O
's	O
newer	O
products	O
.	O
</s>
<s>
PureView	B-Device
Pro	O
is	O
an	O
imaging	O
technology	O
used	O
in	O
the	O
Nokia	B-Language
808	I-Language
PureView	I-Language
device	O
.	O
</s>
<s>
It	O
is	O
the	O
combination	O
of	O
a	O
large	O
1/1.2in	O
,	O
very	O
high-resolution	O
41MP	O
image	B-Algorithm
sensor	I-Algorithm
with	O
high-performance	O
Carl	O
Zeiss	O
optics	O
.	O
</s>
<s>
The	O
large	O
sensor	O
enables	O
pixel	B-Algorithm
oversampling	B-General_Concept
,	O
which	O
means	O
the	O
combination	O
of	O
many	O
sensor	O
pixels	B-Algorithm
into	O
one	O
image	O
pixel	B-Algorithm
.	O
</s>
<s>
PureView	B-Device
imaging	O
technology	O
delivers	O
high	O
image	O
quality	O
,	O
lossless	O
zoom	O
and	O
improved	O
low	O
light	O
performance	O
(	O
see	O
below	O
)	O
.	O
</s>
<s>
It	O
dispenses	O
with	O
the	O
usual	O
scaling/interpolation	O
model	O
of	O
digital	B-Algorithm
zoom	I-Algorithm
commonly	O
used	O
in	O
other	O
smartphones	B-Application
,	O
as	O
well	O
as	O
optical	O
zoom	O
used	O
in	O
most	O
digital	O
cameras	O
,	O
where	O
a	O
series	O
of	O
lens	O
elements	O
moves	O
back	O
and	O
forth	O
to	O
vary	O
the	O
magnification	O
and	O
field	O
of	O
view	O
.	O
</s>
<s>
The	O
Nokia	B-Language
808	I-Language
has	O
a	O
41.3megapixel	O
1/1.2in	O
CMOS	B-Architecture
FSI	O
image	B-Algorithm
sensor	I-Algorithm
with	O
7728x5368	O
pixels	B-Algorithm
.	O
</s>
<s>
Pixel	B-Algorithm
size	O
is	O
1.4µm	O
;	O
sensor	O
size	O
is	O
10.67	O
×	O
8.00mm	O
.	O
</s>
<s>
Depending	O
on	O
the	O
aspect	O
ratio	O
chosen	O
by	O
the	O
user	O
,	O
the	O
sensor	O
will	O
use	O
either	O
7728x4354	O
pixels	B-Algorithm
(	O
33.6MP	O
)	O
for	O
16:9	O
images	O
,	O
or	O
7152x5368	O
pixels	B-Algorithm
(	O
38.4MP	O
)	O
for	O
4:3	O
images	O
when	O
using	O
the	O
default	O
camera	O
software	O
,	O
although	O
third-party	O
apps	O
exist	O
that	O
can	O
capture	O
the	O
full	O
resolution	O
of	O
the	O
sensor	O
.	O
</s>
<s>
The	O
output	O
from	O
the	O
sensor	O
is	O
processed	O
using	O
the	O
on-chip	B-Architecture
image	B-General_Concept
processor	I-General_Concept
,	O
resulting	O
in	O
a	O
lower-resolution	O
image	O
with	O
pixel	B-Algorithm
oversampling	B-General_Concept
,	O
lossless	O
digital	B-Algorithm
zoom	I-Algorithm
,	O
or	O
a	O
combination	O
of	O
both	O
.	O
</s>
<s>
The	O
image	B-General_Concept
processor	I-General_Concept
highly	O
reduces	O
external	O
processing	O
needs	O
and	O
data	O
rates	O
as	O
well	O
as	O
image	B-Algorithm
noise	I-Algorithm
(	O
see	O
noise	O
shaping	O
)	O
.	O
</s>
<s>
The	O
level	O
of	O
pixel	B-Algorithm
oversampling	B-General_Concept
is	O
highest	O
when	O
zoom	O
is	O
not	O
used	O
.	O
</s>
<s>
It	O
gradually	O
decreases	O
until	O
the	O
maximum	O
zoom	O
is	O
hit	O
,	O
where	O
there	O
is	O
no	O
oversampling	B-General_Concept
.	O
</s>
<s>
At	O
this	O
stage	O
,	O
PureView	B-Device
Pro	O
optics	O
and	O
pixels	B-Algorithm
start	O
behaving	O
in	O
a	O
more	O
conventional	O
way	O
.	O
</s>
<s>
This	O
also	O
means	O
that	O
at	O
full	O
digital	B-Algorithm
zoom	I-Algorithm
,	O
the	O
noise	O
reduction	O
achieved	O
by	O
oversampling	B-General_Concept
(	O
pixel	B-Algorithm
binning	O
)	O
is	O
lost	O
as	O
no	O
oversampling	B-General_Concept
happens	O
at	O
full	O
zoom	O
.	O
</s>
<s>
PureView	B-Device
Pro	O
features	O
continuous	O
autofocus	O
in	O
all	O
shooting	O
modes	O
,	O
close-up	O
(	O
Macro	O
)	O
focus	O
,	O
face	B-General_Concept
detection	I-General_Concept
,	O
touch	O
focus	O
with	O
easy	O
manually	O
selected	O
focus	O
point	O
and	O
hyperfocal	O
distance	O
focus	O
for	O
defined	O
depth	O
of	O
field	O
,	O
for	O
extreme	O
focus	O
speed	O
or	O
when	O
reliably	O
achieving	O
focus	O
is	O
not	O
possible	O
.	O
</s>
<s>
The	O
on-chip	B-Architecture
oversampling	B-General_Concept
image	B-General_Concept
processor	I-General_Concept
of	O
the	O
808	O
enables	O
oversampling	B-General_Concept
of	O
all	O
38	O
megapixels	O
even	O
at	O
the	O
high	O
video	O
data	O
rates	O
of	O
1080p	O
with	O
30fps	O
.	O
</s>
<s>
In	O
addition	O
,	O
encoding	O
is	O
up	O
to	O
25Mbps	O
in	O
1080p	O
H.264/MPEG	B-Application
-4	I-Application
HD	O
video	O
format	O
.	O
</s>
<s>
The	O
PureView	B-Device
Pro	O
sensor	O
integrates	O
a	O
special	O
video	O
processor	O
that	O
handles	O
pixel	B-Algorithm
scaling	I-Algorithm
at	O
up	O
to	O
1	O
billion	O
pixels	B-Algorithm
per	O
second	O
before	O
sending	O
the	O
required	O
number	O
to	O
the	O
main	O
image	B-General_Concept
processor	I-General_Concept
.	O
</s>
<s>
The	O
808	O
has	O
Carl	O
Zeiss	O
5-element	O
lens	O
with	O
f/2.4	O
aperture	O
and	O
8.02mm	O
focal	B-Algorithm
length	I-Algorithm
(	O
35mm	O
equivalent	O
focal	B-Algorithm
length	I-Algorithm
is	O
26mm	O
in	O
16:9	O
and	O
28mm	O
in	O
4:3	O
aspect	O
ratio	O
)	O
.	O
</s>
<s>
The	O
optics	O
are	O
based	O
on	O
a	O
shiftable	O
fixed-focus	O
lens	O
;	O
similar	O
to	O
the	O
prime	O
lenses	O
in	O
most	O
Zeiss	O
Planar	O
or	O
Tessar	O
optics	O
,	O
focus	O
is	O
achieved	O
by	O
varying	O
the	O
distance	O
to	O
the	O
image	B-Algorithm
sensor	I-Algorithm
(	O
unit	O
focusing	O
lens	O
)	O
.	O
</s>
<s>
Due	O
to	O
the	O
comparatively	O
large	O
1/1.2in	O
sensor	O
and	O
the	O
comparatively	O
fast	O
lens	O
with	O
f/2.4	O
aperture	O
,	O
the	O
camera	O
has	O
a	O
quite	O
shallow	O
depth	O
of	O
field	O
,	O
equivalent	O
to	O
approximately	O
f/7.8	O
at	O
26mm	O
on	O
35mm	B-Algorithm
full-frame	I-Algorithm
.	O
</s>
<s>
The	O
808	B-Language
PureView	I-Language
employs	O
Dolby	O
Headphone	O
software	O
to	O
transform	O
stereo	O
content	O
to	O
surround	O
via	O
a	O
3.5mm	O
A/V	O
jack	O
.	O
</s>
<s>
It	O
also	O
includes	O
Dolby	O
Digital	O
Plus	O
software	O
to	O
provide	O
5.1	O
surround	O
sound	O
via	O
HDMI	B-Protocol
or	O
DLNA	O
.	O
</s>
<s>
The	O
dual	O
software	O
elements	O
from	O
Dolby	O
are	O
embedded	O
into	O
the	O
Nokia	B-Operating_System
Belle	I-Operating_System
feature	O
pack	O
1	O
OS	O
.	O
</s>
<s>
The	O
808	B-Language
PureView	I-Language
is	O
the	O
first	O
device	O
to	O
include	O
the	O
Nokia	O
Rich	O
Recording	O
technology	O
and	O
has	O
a	O
frequency	O
range	O
between	O
25Hz	O
to	O
around	O
19kHz	O
.	O
</s>
<s>
The	O
808	B-Language
PureView	I-Language
can	O
capture	O
sounds	O
at	O
the	O
loudness	O
level	O
of	O
up	O
to	O
145	O
decibels	O
without	O
distortion	O
.	O
</s>
