<s>
Digital	B-Algorithm
holography	I-Algorithm
refers	O
to	O
the	O
acquisition	O
and	O
processing	O
of	O
holograms	B-Algorithm
with	O
a	O
digital	O
sensor	O
array	O
,	O
typically	O
a	O
CCD	O
camera	O
or	O
a	O
similar	O
device	O
.	O
</s>
<s>
Digital	B-Algorithm
holography	I-Algorithm
offers	O
a	O
means	O
of	O
measuring	O
optical	O
phase	O
data	O
and	O
typically	O
delivers	O
three-dimensional	O
surface	O
or	O
optical	O
thickness	O
images	O
.	O
</s>
<s>
These	O
discoveries	O
were	O
made	O
by	O
Emmett	B-Algorithm
Leith	I-Algorithm
and	O
Juris	O
Upatnieks	O
for	O
analog	O
holography	B-Algorithm
,	O
and	O
subsequently	O
adapted	O
to	O
digital	B-Algorithm
holography	I-Algorithm
.	O
</s>
<s>
The	O
phase-shifting	O
(	O
or	O
phase-stepped	O
)	O
digital	B-Algorithm
holography	I-Algorithm
process	O
entails	O
capturing	O
multiple	O
interferograms	O
that	O
each	O
indicate	O
the	O
optical	O
phase	O
relationships	O
between	O
light	O
returned	O
from	O
all	O
points	O
on	O
the	O
illuminated	O
object	O
and	O
a	O
controlled	O
reference	O
beam	O
of	O
light	O
.	O
</s>
<s>
From	O
a	O
linear	O
combination	O
of	O
these	O
interferograms	O
,	O
complex-valued	O
holograms	B-Algorithm
are	O
formed	O
.	O
</s>
<s>
These	O
holograms	B-Algorithm
contain	O
amplitude	O
and	O
phase	O
information	O
of	O
the	O
optical	O
radiation	O
diffracted	O
by	O
the	O
object	O
,	O
in	O
the	O
sensor	O
plane	O
.	O
</s>
<s>
Frequency-shifted	O
holograms	B-Algorithm
can	O
be	O
used	O
for	O
narrowband	O
laser	O
Doppler	O
imaging	O
.	O
</s>
<s>
Addressing	O
simultaneously	O
distinct	O
domains	O
of	O
the	O
temporal	O
and	O
spatial	O
bandwidth	O
of	O
holograms	B-Algorithm
was	O
performed	O
with	O
success	O
for	O
angular	O
,	O
wavelength	O
,	O
space-division	O
,	O
polarization	O
,	O
and	O
sideband	O
multiplexing	O
schemes	O
.	O
</s>
<s>
Digital	O
holograms	B-Algorithm
can	O
be	O
numerically	O
multiplexed	O
and	O
demultiplexed	O
for	O
efficient	O
storage	O
and	O
transmission	O
.	O
</s>
<s>
Optical	O
sectioning	O
,	O
also	O
known	O
as	O
sectional	O
image	O
reconstruction	O
,	O
is	O
the	O
process	O
of	O
recovering	O
a	O
planar	O
image	O
at	O
a	O
particular	O
axial	O
depth	O
from	O
a	O
three-dimensional	O
digital	O
hologram	B-Algorithm
.	O
</s>
<s>
By	O
using	O
the	O
3D	O
imaging	O
capability	O
of	O
Digital	B-Algorithm
Holography	I-Algorithm
in	O
amplitude	O
and	O
phase	O
it	O
is	O
possible	O
to	O
extend	O
the	O
depth	O
of	O
focus	O
in	O
microscopy	O
.	O
</s>
