Signal Processing for Stereoscopic and Multi-View 3D Displays - Signal Processing Systems - page 18

a b c

Fig. 10 Ghosting artifacts: ( a ) color-balanced ghosting, ( b ) color bleeding and ( c ) crosstalk as
function of the observation angle in autostereoscopic displays

a b

Fig. 11 Accommodation-convergence rivalry: ( a ) focal and convergence distance mismatch and
( b ) zones of clear single vision and Percival's zones of comfort (adapted from [ 44 ] )

between the focal and convergence distance prevents the eyes from converging,
causing diplopia . Stereoscopic fusion is possible only for some combinations
between focal distance and convergence distance. The set of focal and convergence
distances which allow fusion define so-called zones of clear single vision , as seen
in Fig. 11 b [ 44 ] . Inside the zones of clear single vision resides a narrower area,
known as Percival's zone of comfort , where the difference between the apparent
and actually focal distance is less than 0.5 diopters. Within the Percival's zone of
comfort A/C rivalry is negligible [ 2 , 44 ] .
Pseudoscopy ( reverse stereo ) is the situation in which the eyes see the opposite
views; i.e. the left eye sees the right view, and vice versa. For example, the
left observer in Fig. 12 a sees proper stereo image, while the observer in the
right experiences pseudoscopy. In a pseudoscopic image the binocular depth cues
contradict the pictorial ones, which results in perceptually disturbing image [ 47 ] .
Another factor which narrows the size of the sweet spots is the stereo-edge. Between
the stereoscopic and pseudoscopic areas there are zones with high crosstalk where
the 3D effect is not visible, as marked with “X” in Fig. 12 b .