<s>
A	O
lens	B-Algorithm
controller	I-Algorithm
is	O
device	O
that	O
controls	O
motorized	O
photographic	O
lens	O
functions	O
such	O
as	O
zoom	O
,	O
focus	O
,	O
and	O
iris	O
opening	O
(	O
aperture	B-General_Concept
)	O
.	O
</s>
<s>
Lens	B-Algorithm
controllers	I-Algorithm
can	O
be	O
found	O
in	O
still	O
camera	O
photographic	O
lenses	O
and	O
as	O
stand-alone	O
units	O
in	O
machine	B-General_Concept
vision	I-General_Concept
,	O
remote	B-Application
sensing	I-Application
,	O
optoelectronics	O
systems	O
,	O
and	O
security	O
applications	O
.	O
</s>
<s>
Internal	O
photographic	O
lens	B-Algorithm
controllers	I-Algorithm
take	O
information	O
from	O
the	O
camera	O
or	O
lens	O
elements	O
and	O
perform	O
automatic	O
and	O
manual	O
focusing	O
and	O
aperture	B-General_Concept
adjustment	O
.	O
</s>
<s>
Stand-alone	O
lens	B-Algorithm
controllers	I-Algorithm
are	O
attached	O
to	O
a	O
photographic	O
lens	O
by	O
a	O
cable	O
to	O
allow	O
operator	O
manual	O
control	O
of	O
lens	O
functions	O
.	O
</s>
<s>
Lens	B-Algorithm
controllers	I-Algorithm
for	O
machine	B-General_Concept
vision	I-General_Concept
are	O
universal	O
devices	O
designed	O
to	O
control	O
lenses	O
from	O
multiple	O
manufacturers	O
.	O
</s>
<s>
Machine	B-General_Concept
vision	I-General_Concept
lens	B-Algorithm
controllers	I-Algorithm
come	O
in	O
manual	O
or	O
computerized	O
varieties	O
.	O
</s>
<s>
Manual	O
lens	B-Algorithm
controllers	I-Algorithm
are	O
composed	O
of	O
switches	O
and	O
a	O
power	O
supply	O
.	O
</s>
<s>
Manual	O
lens	B-Algorithm
controllers	I-Algorithm
are	O
the	O
most	O
common	O
and	O
are	O
frequently	O
used	O
in	O
CCTV	O
security	O
systems	O
.	O
</s>
<s>
Computerized	O
lens	B-Algorithm
controllers	I-Algorithm
are	O
composed	O
of	O
a	O
computer	O
,	O
electronic	O
switches	O
such	O
as	O
H-Bridges	O
or	O
relays	O
,	O
a	O
power	O
supply	O
,	O
and	O
an	O
electronic	O
interface	O
.	O
</s>
<s>
A	O
remote	O
computer	O
sends	O
a	O
command	O
to	O
the	O
lens	B-Algorithm
controller	I-Algorithm
through	O
an	O
RS-232	O
,	O
RS-485	O
,	O
USB	B-Protocol
,	O
or	O
Ethernet	O
interface	O
to	O
actuate	O
a	O
lens	O
function	O
.	O
</s>
<s>
The	O
lens	B-Algorithm
controller	I-Algorithm
will	O
then	O
perform	O
the	O
command	O
automatically	O
.	O
</s>
