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Figure 13.1 Stereoscopic vision from a simple image
Figure 13.2 Positive parallax makes visualising objects behind the screen possible; DIO: Intraocular
Distance 65mm on average
corresponds to a point on the flat surface. The distance between these two points is
called parallax. The parallax creates binocular disparity that gives a stereoscopic effect
of depth with each eye receiving an image similar, but not identical , to that of a real
spatial vision. We emphasize that the images created are not identical and the images
observed by the eyes are only plane images obtained by geometric projection of solids
in space.
These plane projections induce geometric and psychophysical constraints in plane
images that spatial vision does not induce. We will explain these constraints in the fol-
lowing paragraphs. The value of the parallax varies according to the distance between
the object and the screen. We have the following classification:
Positive parallax (not crossed):
When the object observed is located virtually behind the screen, the parallax is positive.
The left and right homologous points are respectively displayed to the left and to the
right (Figure 13.2).
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