<s>
In	O
optics	B-Algorithm
and	O
signal	O
processing	O
,	O
wavefront	B-Algorithm
coding	I-Algorithm
refers	O
to	O
the	O
use	O
of	O
a	O
phase	O
modulating	O
element	O
in	O
conjunction	O
with	O
deconvolution	B-Algorithm
to	O
extend	O
the	O
depth	O
of	O
field	O
of	O
a	O
digital	O
imaging	O
system	O
such	O
as	O
a	O
video	O
camera	O
.	O
</s>
<s>
Wavefront	B-Algorithm
coding	I-Algorithm
falls	O
under	O
the	O
broad	O
category	O
of	O
computational	B-Algorithm
photography	I-Algorithm
as	O
a	O
technique	O
to	O
enhance	O
the	O
depth	O
of	O
field	O
.	O
</s>
<s>
Wavefront	B-Algorithm
coding	I-Algorithm
with	O
linear	O
phase	O
masks	O
works	O
by	O
creating	O
an	O
optical	O
transfer	O
function	O
that	O
encodes	O
distance	O
information	O
.	O
</s>
<s>
Wavefront	B-Algorithm
Coding	I-Algorithm
with	O
cubic	O
phase	O
masks	O
works	O
to	O
blur	O
the	O
image	O
uniformly	O
using	O
a	O
cubic	O
shaped	O
waveplate	O
so	O
that	O
the	O
intermediate	O
image	O
,	O
the	O
optical	O
transfer	O
function	O
,	O
is	O
out	O
of	O
focus	O
by	O
a	O
constant	O
amount	O
.	O
</s>
<s>
Digital	B-Algorithm
image	I-Algorithm
processing	I-Algorithm
then	O
removes	O
the	O
blur	O
and	O
introduces	O
noise	O
depending	O
upon	O
the	O
physical	O
characteristics	O
of	O
the	O
processor	O
.	O
</s>
<s>
The	O
technique	O
was	O
pioneered	O
by	O
radar	B-Application
engineer	O
Edward	O
Dowski	O
and	O
his	O
thesis	O
adviser	O
Thomas	O
Cathey	O
at	O
the	O
University	O
of	O
Colorado	O
in	O
the	O
United	O
States	O
in	O
the	O
1990s	O
.	O
</s>
<s>
Cathey	O
,	O
Dowski	O
and	O
Merc	O
Mercure	O
founded	O
a	O
company	O
to	O
commercialize	O
the	O
method	O
called	O
CDM-Optics	O
,	O
and	O
licensed	O
the	O
invention	O
from	O
the	O
University	O
.	O
</s>
