
Human senses 69
Screen
IPD
P
DG
Virtual image in
front of the screen
Figure 3.18 Horizontal parallax is defined by the DPG angle
Yei-Yu Yeh and Silverstein (1990) included the criterion of the duration of viewing
the images to examine the limit of merging and the estimation of depth. The limit of
merging is analysed on the basis of different parameters of stimuli displayed on a
cathode screen with active eyeglasses: colour, display time and horizontal parallax.
The results imply that the limit of merging (given in angle of parallax) is very low for
a brief stimulus of 0.2 second, i.e. 27 to 24 minutes of arc compared to a stimulus
of 2 seconds, i.e. 1.5 ...