Digital Signal Processing Reference
In-Depth Information
t
σ
i,j
...
i
H
j
...
W
Figure 6.18
Calculation of ZMA.
f
2
are derived as functions of
nZMA
, so that they correlate with the subjec-
tively evaluated relative importance of image and depth quality with regards
to overall 3D quality, over different content characteristics. The resultant
f
1
and
f
2
functions are as follows:
nZMA
0.2393
f
1
(
nZMA
)
=
1
−
0.997
·
(6.33)
nZMA
0.2393
=
·
f
2
(
nZMA
)
0.997
(6.34)
The Correlation Coefficient (CC) between the objectively evaluated weight-
ing functions and the subjectively evaluated relative importance is 0.94
(CC
1 indicates the perfect correlation). The effectiveness of these weighting
functions for different content characteristics is verified for all other video
sequences considered in the following section.
=
6.4.3.2 Compound 3D Quality Model
Incorporating the weighting functions
f
1
and
f
2
Equation (6.28) can be
rearranged as follows:
nZMA
0.2393
)
3
D
_
Quality
=
(1
−
0.997
·
·
image
_
quality
nZMA
0.2393
)
+
(0.997
·
·
depth
_
quality
(6.35)
By substituting the objective quality models proposed earlier for image
and depth quality to Equation (6.35), the overall 3D quality model can be
Search WWH ::
Custom Search