<s>
Deblurring	B-Algorithm
is	O
the	O
process	O
of	O
removing	O
blurring	O
artifacts	O
from	O
images	O
.	O
</s>
<s>
Deblurring	B-Algorithm
recovers	O
a	O
sharp	O
image	O
S	O
from	O
a	O
blurred	O
image	O
B	O
,	O
where	O
S	O
is	O
convolved	B-Algorithm
with	O
K	O
(	O
the	O
blur	O
kernel	B-Algorithm
)	O
to	O
generate	O
B	O
.	O
</s>
<s>
Mathematically	O
,	O
this	O
can	O
be	O
represented	O
as	O
(	O
where	O
*	O
represents	O
convolution	B-Algorithm
)	O
.	O
</s>
<s>
While	O
this	O
process	O
is	O
sometimes	O
known	O
as	O
unblurring	B-Algorithm
,	O
deblurring	B-Algorithm
is	O
the	O
correct	O
technical	O
word	O
.	O
</s>
<s>
The	O
blur	O
K	O
is	O
typically	O
modeled	O
as	O
point	O
spread	O
function	O
and	O
is	O
convolved	B-Algorithm
with	O
a	O
hypothetical	O
sharp	O
image	O
S	O
to	O
get	O
B	O
,	O
where	O
both	O
the	O
S	O
(	O
which	O
is	O
to	O
be	O
recovered	O
)	O
and	O
the	O
point	O
spread	O
function	O
K	O
are	O
unknown	O
.	O
</s>
<s>
In	O
almost	O
all	O
cases	O
,	O
there	O
is	O
insufficient	O
information	O
in	O
the	O
blurred	O
image	O
to	O
uniquely	O
determine	O
a	O
plausible	O
original	O
image	O
,	O
making	O
it	O
an	O
ill-posed	B-Algorithm
problem	I-Algorithm
.	O
</s>
<s>
This	O
problem	O
is	O
analogous	O
to	O
echo	B-Algorithm
removal	I-Algorithm
in	O
the	O
signal	O
processing	O
domain	O
.	O
</s>
<s>
By	O
proper	O
deconvolution	B-Algorithm
of	O
the	O
point	O
spread	O
function	O
K	O
and	O
the	O
blurred	O
image	O
B	O
,	O
the	O
blurred	O
image	O
B	O
can	O
be	O
deblurred	O
(	O
unblur	O
)	O
and	O
the	O
sharp	O
image	O
S	O
can	O
be	O
recovered	O
.	O
</s>
