Chapter
In
tro
duction
As
computers
are
slo
wly
creeping
out
of
their
traditional
settings
they
will
require
new
in
terfaces P
ar
F
or
example
there
is
curren
tly
no
c
heap
easy
and
univ
ersally
applicable
w
a
y
of
getting
accurate
real time
measuremen
ts
of
a
p
erson s
gesture
in
an
immersiv
e
en
vironmen
t
More
sp
eci cally
di eren
t
tec
hnologies
ha
v
e
b
een
applied
in
HCI
Human
Computer
In
teraction
researc
h
and
dev
elopmen
t
to
trac
k
the
p
osi
tion
of
hands
and
ob
jects
atop
in
telligen
t
surfaces
None
of
them
so
far
ha
v
e
b
een
accurate
c
heap
fast
and
generally
reliable
enough
to
w
arran
t
their
application
in
trac
king
hands
ab
o
v
e
large
in
teractiv
e
e g
displa
y
surfaces
In
recen
t
y
ears
laser
range nders
ha
v
e
b
een
a
to
ol
of
surv
ey
ors Re
and
aid
to
soldiers Urb
and
ey
es
for
rob
ot
vision Ev
e
T
o
meet
suc
h
requiremen
ts
scanning
laser
range nders
ha
v
e
t
ypically
cost
sev
eral
thousands
of
dollars
and
pro
duced
results
of
sub millimeter
ac
curacy
and or
attained
kilometers
of
range
measuremen
t
This
thesis
describ
es
the
dev
elopmen
t
of
m
uc
h
lo
w
er
cost
scanning
laser
range nders
with
mo
derate
resolution
and
only
sev
eral
meters
of
range
w
ell suited
to
w
orking
as
an
input
device
for
large
screen
displa
ys
HCI
Motiv
ation
and
Existing
Metho
ds
Non con
tact
user
in
terface
design
has
b
een
addressed
in
a
v
ariet
y
of
elds
b
y
the
use
of
m
ultiple
disciplines
A
familiar
illusion
of
a
non con
tact
in
terface
most
commonly