<s>
Cyclodisparity	B-Algorithm
refers	O
to	O
the	O
difference	O
in	O
the	O
rotation	O
angle	O
of	O
an	O
object	O
or	O
scene	O
viewed	O
by	O
the	O
left	O
and	O
right	O
eyes	O
.	O
</s>
<s>
Cyclodisparity	B-Algorithm
can	O
result	O
from	O
the	O
eyes	O
 '	O
torsional	O
rotation	O
(	O
cyclorotation	O
)	O
or	O
can	O
be	O
created	O
artificially	O
by	O
presenting	O
to	O
the	O
eyes	O
two	O
images	O
that	O
need	O
to	O
be	O
rotated	O
relative	O
to	O
each	O
other	O
for	O
binocular	B-Algorithm
fusion	I-Algorithm
to	O
take	O
place	O
.	O
</s>
<s>
The	O
eyes	O
and	O
visual	O
system	O
can	O
compensate	O
for	O
cyclodisparity	B-Algorithm
up	O
to	O
a	O
certain	O
point	O
;	O
if	O
the	O
cyclodisparity	B-Algorithm
is	O
larger	O
than	O
a	O
threshold	O
,	O
the	O
images	O
cannot	O
be	O
fused	O
,	O
resulting	O
stereoblindness	B-Algorithm
,	O
and	O
in	O
double	O
vision	O
in	O
subjects	O
who	O
otherwise	O
have	O
full	O
stereo	O
vision	O
.	O
</s>
<s>
When	O
a	O
human	O
subject	O
is	O
presented	O
with	O
images	O
that	O
have	O
artificial	O
cyclodisparity	B-Algorithm
,	O
cyclovergence	B-Algorithm
is	O
evoked	O
,	O
that	O
is	O
,	O
a	O
motor	O
response	O
of	O
the	O
eye	O
muscles	O
that	O
rotates	O
the	O
two	O
eyes	O
in	O
opposite	O
directions	O
,	O
thereby	O
reducing	O
cyclodisparity	B-Algorithm
.	O
</s>
<s>
Visually-induced	O
cyclovergence	B-Algorithm
of	O
up	O
to	O
8	O
degrees	O
has	O
been	O
observed	O
in	O
normal	O
subjects	O
.	O
</s>
<s>
This	O
means	O
that	O
the	O
normal	O
human	O
observer	O
can	O
achieve	O
binocular	O
image	O
fusion	O
in	O
presence	O
of	O
cyclodisparity	B-Algorithm
of	O
up	O
to	O
approximately	O
16	O
degrees	O
.	O
</s>
<s>
Cyclodisparity	B-Algorithm
due	O
to	O
images	O
having	O
been	O
rotated	O
inward	O
can	O
be	O
compensated	O
better	O
when	O
the	O
gaze	O
is	O
directed	O
downwards	O
,	O
and	O
cyclodisparity	B-Algorithm
due	O
to	O
an	O
outward	O
rotation	O
can	O
be	O
compensated	O
better	O
when	O
the	O
gaze	O
is	O
directed	O
upwards	O
.	O
</s>
<s>
A	O
proposed	O
explanation	O
for	O
this	O
phenomenon	O
is	O
that	O
the	O
motor	O
system	O
is	O
coordinated	O
in	O
such	O
a	O
way	O
that	O
the	O
eyes	O
perform	O
a	O
torsional	O
movement	O
to	O
reduce	O
the	O
size	O
of	O
the	O
search	O
zones	O
and	O
thus	O
the	O
computational	O
load	O
required	O
for	O
solving	O
the	O
correspondence	B-Algorithm
problem	I-Algorithm
.	O
</s>
<s>
The	O
resulting	O
cyclovergence	B-Algorithm
at	O
near	O
gaze	O
is	O
smaller	O
than	O
the	O
cyclovergence	B-Algorithm
predicted	O
by	O
Listing	O
's	O
law	O
.	O
</s>
<s>
Active	O
camera	O
torsion	O
can	O
be	O
used	O
in	O
machine	B-Application
and	I-Application
computer	I-Application
vision	I-Application
for	O
several	O
purposes	O
.	O
</s>
<s>
For	O
image	O
compression	O
purposes	O
,	O
images	O
with	O
cyclodisparity	B-Algorithm
are	O
advantageously	O
encoded	O
using	O
global	B-Algorithm
motion	I-Algorithm
compensation	I-Algorithm
using	O
a	O
rotational	O
motion	O
model	O
.	O
</s>
