Game Development Reference
In-Depth Information
Fig. 11.3
Framework of the MOVIE index (Seshadrinathan et al.
2010
)
f
as well. Then,
the spatial MOVIE index attempts to capture this property of human vision and we
define the spatial error from each sub-band response using,
(
i
,
k
)
spanned by the window
B
. Similar definition applies for
g(
k
)
f
n
(
2
N
)
−
g
n
(
1
2
1
N
k
k
)
E
S
(
i
0
,
k
)
=
,
(11.21)
M
(
k
)
+
C
1
n
=
1
where
M
(
k
)
is defined as
⊛
⊞
N
N
1
N
1
N
⊝
⊠
.
2
2
)
=
f
n
(
k
)
,
1
g
n
(
k
)
(11.22)
M
(
k
max
n
=
1
n
=
C
1
is a small positive constant that is included to prevent numerical instability. We
estimate the mean as the average of the Gaussian filtered output by
N
N
1
N
1
N
μ
f
=
f
n
(
DC
) ,
μ
g
=
1
g
n
(
DC
) .
(11.23)
n
=
1
n
=
An error index for the DC sub-band is then computed in a similar fashion as the
Gabor sub-bands
f
n
(
2
−
g
n
(
)
−
μ
g
N
DC
)
−
μ
f
DC
1
2
1
N
E
DC
(
i
0
)
=
,
(11.24)
M
DC
+
C
2
n
=
1
where
M
DC
is defines as
