Holographic Stereogram Conversion Process.
Final technical rept.,
NORTHROP RESEARCH AND TECHNOLOGY CENTER HAWTHORNE CALIF
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Practical methods are described for making holographic stereograms from aerialphoto transparencies. The stereograms are viewed in white light without spectacles. They use holography to selectively convey left and right stereoscopic viewpoints to respective eyes of the observer, who subjectively perceives the display as three-dimensional. Left and right pictures are directly overlapped as double-exposure focused-image-plane holograms. Cross-talk between the left and right views is minimized by using a transparent, phase-type, thick-film holographic medium such as dichromated gelatin. Bragg-reflection conditions are satisfied throughout the emulsion, to maximize hologram brightness.
- Cartography and Aerial Photography