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Figure 13.16 Diagram of the principle of depth perception on a sheet
13.4 ANNEXE
13.4.1 3D Perception on a sheet
Depth perception in binocular vision due to stereopsis is possible using a sheet. This
phenomenon is perceptible by controlling one's visual system to be used in an unusual
manner: it is necessary to uncouple the convergence and accommodation of the eyes.
This constraint is the same as when viewing the stereoscopic screen, but in the latter,
it is reduced and only felt by the viewer. On the other hand, for perception of depth
on a sheet, the observer should himself impose this constraint on his eyes. Therefore
it is necessary to squint in front of the sheet (at C) and accommodate to the level of
the sheet (Figure 13.16). It is a habit to be picked up. This exercise requires some time
initially and tires the eyes. It is not advisable to do it for a very long time. Another
solution is possible, without crossing the right and left images, but in this arrangement,
convergence behind the sheet is required.
BIBLIOGRAPHIC REFERENCES
Baker, J. (1987) Generating images for a time-multiplexed stereoscopic computer graphic system.
In: Proceedings of SPIE, volume 761 . pp. 44-52.
Fuchs, P., Ernadotte, D., Maman, D., Laurgeau, C. & Bordas, J. (1995) Téléprésence virtuelle
stéréoscopique. In: Interface des Mondes réels et virtuels . Montpellier. pp. 77-91.
Julesz, B. (1971) Foundation of cyclopean perception . Chicago, IL, University of Chicago Press.
Leroy, L. (2009) Interfaçage visuel stéréoscopique: Diminution de la fatigue visuelle et carac-
térisation de la perception des formes. PhD thesis, Ecole nationale supérieure des Mines de
Paris, Paris.
MacAllister, D. & Hodges, L. (1990) Rotation algorithm artifacts in stereoscopic images.
Optical Engineering , 29 (8), 973-976.
Perrin, J. (1998) Profondeur et binocularité: Algorithmie, étude psychophysique et intérêt pour
l'ergonomie des interfaces stéréoscopiques. Thèse de doctorat, Ecole des Mines de Paris, Paris.
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