Image Processing Reference
In-Depth Information
10.3.2.1 Definitions
To analyze the influence of crossed and uncrossed disparity, and the disparity
magnitude of the moving object on visual discomfort, in this study, we use disparity
amplitude and disparity offset to define the motion in stereoscopic videos. The
disparity amplitude d a between the nearest point A and farthest point B can be
expressed by Eq. (1) which represents the range of the disparity of the moving
object.
ϕ B represents the disparity of
point B. The disparity offset d o between the two points A and B can be expressed by
Eq. (2) which represents the center of the angular disparity between the two points.
The static and planar motion stimuli can be characterized by the disparity offset
and the planar velocity, where the disparity amplitude equals zero. The in-depth
motion stimuli can be defined by the disparity amplitude, the disparity offset, and
the in-depth velocity.
ϕ A represents the disparity of point A , and
d a ¼ ϕ A ϕ B
j
j
ð
:
Þ
10
1
1
2 ϕ A þ ϕ B
d o ¼
ð
Þ
ð 10 : 2 Þ
10.3.2.2 Experimental Design
To avoid the complexity of the influence factors contained in 3D natural video
sequences, synthetic stimuli were used in this study allowing for precise control on
the possible influence factors, including motion type, velocity, disparity offset, and
disparity amplitude. In Experiment 1, 36 synthetic video stimuli were used, includ-
ing 15 planar motion stimuli, 5 static stimuli, and 16 in-depth motion stimuli.
For the planar motion stimuli, we selected five angular disparity offset levels
1.3 ) and three velocity levels (slow, medium, and fast with
velocity of 6, 15, and 24 /s). A background is designed to be placed at a fixed
position (
(0,
0.65, and
1.4 ) which is consistent with a typical natural video content where the
background is almost fixed and placed behind the screen. Figure 10.3 shows the
disparities used in the planar motion stimuli and their relationship with the com-
fortable viewing zone.
Fig. 10.3 The relationship of the foreground and the background position and the comfortable
viewing zone in planar motion stimuli
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