<s>
Human	B-Algorithm
presence	I-Algorithm
detection	I-Algorithm
is	O
a	O
range	O
of	O
technologies	O
and	O
methods	O
for	O
detecting	O
the	O
presence	O
of	O
a	O
human	O
body	O
in	O
an	O
area	O
of	O
interest	O
(	O
AOI	O
)	O
,	O
or	O
verification	O
that	O
computer	O
,	O
smartphone	O
(	O
or	O
other	O
device	O
controlled	O
by	O
software	O
)	O
is	O
operated	O
by	O
human	O
.	O
</s>
<s>
Software	O
and	O
hardware	O
technologies	O
are	O
used	O
for	O
human	B-Algorithm
presence	I-Algorithm
detection	I-Algorithm
.	O
</s>
<s>
Unlike	O
human	B-General_Concept
sensing	I-General_Concept
,	O
that	O
is	O
dealing	O
with	O
human	O
body	O
only	O
,	O
human	B-Algorithm
presence	I-Algorithm
detection	I-Algorithm
technologies	O
are	O
used	O
to	O
verify	O
for	O
safety	O
,	O
security	O
or	O
other	O
reasons	O
that	O
human	O
person	O
,	O
but	O
not	O
any	O
other	O
object	O
is	O
identified	O
.	O
</s>
