Image Processing Reference
In-Depth Information
Fig. 10.8 The Bradley-Terry scores of the static and the in-depth motion stimuli. (a) The
x
-axis
represents the disparity offsets,
different lines
represent different disparity amplitudes (
d
a
) and
velocities. (b) The
x
-axis represents velocity.
Different lines
represent different disparity offset
(
r
o
). Note that the BT score is the mean scores of the stimuli with same offset and velocity but
different disparity amplitudes
The static condition can be considered as a special case of the in-depth motion as
well. The BT scores of the static stimuli were compared with the in-depth motion
stimuli which are shown in Fig.
10.8
.
As shown in Fig.
10.8a
, the gradient of the curve for in-depth motion is much
flatter than for the static conditions. When the disparity offset is less than 0.65
, the
in-depth motion will generate more visual discomfort than the static stimuli. For
example, when compared with the static stimuli with the disparity of 0
, all the
in-depth motion stimuli in our study generated more visual discomfort. However,
when the relative disparity is larger than 2.05
(
d
o
¼
0.65
), we may extrapolate that
the visual discomfort induced by the static stimuli would be higher than the in-depth
motion stimuli.
Considering the velocity, as shown in Fig.
10.8b
, when the relative disparity is
less than 2.05
(
d
o
¼
0.65
), the visual discomfort increases with the velocity.
However, if the relative disparity is larger than 2.05
, the static stimuli might
generate more visual discomfort than the in-depth motion stimuli with slow velocity.
10.3.3.3 Discussions
In the current literature it is often mentioned that the motion in stereoscopic videos
would induce more visual discomfort than static conditions. However, in this study,
a counter-indication was found.
All three motion types showed that the relative disparity between the foreground
and the background is a main factor in visual discomfort, i.e., visual discomfort
increases with the relative disparity. The gradient of visual discomfort with relative
disparity is highest for the static stimuli, followed by in-depth and then planar
