<s>
In	O
the	O
context	O
of	O
live-action	O
and	O
computer	O
animation	O
,	O
interpolation	B-Algorithm
is	O
inbetweening	O
,	O
or	O
filling	O
in	O
frames	O
between	O
the	O
key	O
frames	O
.	O
</s>
<s>
It	O
typically	O
calculates	O
the	O
in-between	O
frames	O
through	O
use	O
of	O
(	O
usually	O
)	O
piecewise	O
polynomial	O
interpolation	B-Algorithm
to	O
draw	O
images	O
semi-automatically	O
.	O
</s>
<s>
The	O
computed	O
interpolation	B-Algorithm
process	O
is	O
then	O
used	O
to	O
insert	O
many	O
new	O
values	O
in	O
between	O
these	O
key	O
points	O
to	O
give	O
a	O
"	O
smoother	O
"	O
result	O
.	O
</s>
<s>
For	O
a	O
typical	O
example	O
of	O
2-D	O
interpolation	B-Algorithm
through	O
key	O
points	O
see	O
cardinal	O
spline	O
.	O
</s>
<s>
For	O
examples	O
which	O
go	O
near	O
key	O
points	O
see	O
nonuniform	B-Algorithm
rational	I-Algorithm
B-spline	I-Algorithm
,	O
or	O
Bézier	O
curve	O
.	O
</s>
<s>
This	O
last	O
is	O
commonly	O
called	O
motion	B-Algorithm
control	I-Algorithm
.	O
</s>
<s>
To	O
make	O
these	O
motions	O
appear	O
realistic	O
,	O
interpolation	B-Algorithm
algorithms	O
have	O
been	O
sought	O
which	O
follow	O
,	O
or	O
approximate	O
real	O
life	O
motion	O
dynamics	O
.	O
</s>
<s>
Algorithms	O
such	O
as	O
the	O
Kochanek	B-Algorithm
–	I-Algorithm
Bartels	I-Algorithm
spline	I-Algorithm
provide	O
additional	O
adjustment	O
parameters	O
which	O
allow	O
customizing	O
the	O
in-between	O
behavior	O
to	O
suit	O
a	O
wide	O
variety	O
of	O
situations	O
.	O
</s>
