<s>
A	O
pinhead	B-Algorithm
mirror	I-Algorithm
can	O
be	O
used	O
to	O
create	O
a	O
camera	O
similar	O
to	O
a	O
pinhole	B-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
Instead	O
of	O
passing	O
through	O
a	O
tiny	O
aperature	B-General_Concept
,	O
the	O
light	O
to	O
form	O
the	O
image	O
is	O
reflected	O
by	O
a	O
small	O
disc-shaped	O
mirror	O
(	O
with	O
a	O
diameter	O
the	O
same	O
as	O
that	O
of	O
a	O
pinhole	O
;	O
about	O
0.15mm	O
-	O
0.4mm	O
)	O
.	O
</s>
<s>
One	O
advantage	O
is	O
that	O
a	O
pinhead	B-Algorithm
mirror	I-Algorithm
can	O
be	O
swiveled	O
to	O
scan	B-Algorithm
a	O
scene	O
or	O
project	B-Application
a	O
scene	O
to	O
different	O
locations	O
.	O
</s>
<s>
Pinhead	B-Algorithm
mirror	I-Algorithm
technology	O
was	O
protected	O
under	O
US	O
patent	O
4,948,211	O
-	O
"	O
Method	O
and	O
Apparatus	O
for	O
Optical	B-Algorithm
Imaging	I-Algorithm
Using	O
a	O
Small	O
,	O
Flat	O
Reflecting	O
Surface	O
"	O
until	O
the	O
patent	O
expired	O
in	O
2009	O
.	O
</s>
