Application of Holographic Stereograms to Photographic Interpretation

摘要

Techniques were developed for displaying 3-D images of terrain photography, in an attempt to increase the effectiveness of reconnaissance interpretation by trained and untrained personnel. Two holographic stereogram methods were developed. The first method provides a multi-viewpoint stereogram which appears similar to a classical hologram, but is synthesized from a multitude of component photographs using a ray reconstruction approach. This stereogram is made by an involved process which includes rectification of a number of aerial photos, and subsequent holographic recording of the photos. The multi-viewpoint stereogram is useful for viewing scenes in which features are obscured when viewed from certain directions. The second method developed provides a 3-D holographic stereo-photo-pair display viewable in incoherent illumination. The two-viewpoint stereogram is produced by multiplexing right and left eye views on a focused-image hologram plate. Production is relatively simple, but depends upon efficient phase-type holographic material with good clarity. Major advantages of this stereo-pair display over other devices, such as stereoscopes, are the inherent ease of viewing and the possibility of viewing without any auxiliary equipment in improvised illumination. (Author)