STEREO VIEWING OF LENTICULAR FOIL DISPLAYS: A GEOMETRIC
ANALYSIS
O. Waelder, M.F. Buchroithner
manfred.buchroithner@tu-dresden.de
In recent
years the lenticular foil display (LFD) technology has been gaining increasing
importance for the true 3D visualisation of geodata. Despite the fact, that
this glasses-free auto-stereoscopic approach is by far not new, there still
existed a certain vacuum in the actual understanding of its functioning, as far
as both the psychological and physiological depth-cues are concerned. In
particular, the latter ones have been investigated within a recent study
carried out by the authors. It turned out that, in fact, when viewing an LFD,
only very view of the respective stereo-laces of the totality of the interlaced
stereomates are observed by the viewer. Actually, the human perception system
is cheated, making use of the saccadic eye-movement. The observer screens
("scans") an LFD perpendicular to the strike direction of the
micro-lenses, i. e. in the direction of the x-parallax. Thus, due to the
continuous viewing of rapidly changing different small subsets of the entire
stereo-laces, the observer is able to create his truly three-dimensional scene.
Several depictions showing the actual statistics of the viewed image laces
based on rigid geometric calculations serve to proof this concept.