1988-01-12
1989-05-30
Bovernick, Rodney B.
350 365, 350 386, G03H 130
Patent
active
048344761
ABSTRACT:
Methods and devices for recording and projecting holographic stereograms are disclosed. In one aspect of the invention, a concave semi-cylindrical ("alcove") display system is disclosed in which an image is projected in front of the alcove. The display system provides a very wide angle of view approaching 180 degrees (compared to the 30 degrees of a typical flat hologram) that allows the viewer to look around most of the image content. This type of display is particularly useful in computer aided design projects where designers wish to present an overall three-dimensional display of their work. In another aspect of the invention, a holographic printer and procedures for recording a stereogram are disclosed as well as techniques for producing "predistorted" images for the sub-holograms. A digital processing technique is disclosed which effectively predistorts the source two-dimensional image set for the stereogram to compensate for the effects of the display geometry. This predistortion technique relies upon anamorphic ray tracing. A crossed slit model for the holographic optical system is used to determine the direction and origin of the rays of light from which each sub-hologram of the stereogram is made.
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Bovernick Rodney B.
Callaghan Terry S.
Engellenner Thomas J.
Massachusetts Institute of Technology
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