1 research outputs found
The Holographic Stereogram
The holographic stereogram, a hologram synthesized from ordinary
stereoscopic component photographs, is investigated as an alternative to classical
holograms and to previous types of stereograms for three-dimensional perfect
imagery. The process is partly holographic in nature, but it provides images of
naturally illuminated objects, and its application is not limited by the technology
of laser illumination. The pinhole camera stereogram and the fly's eye lens
stereogram are also analyzed, since the principles of their operation are similar.
Pinhole camera stereogram imagery is shown to have several deficiencies, among
which is the necessity for small camera-object distances. The fly's eye lens is
much superior, but is limited in practice by aberrations, a difficulty which the
holographic stereogram overcomes. Also treated are the full-color, the focused type,
and the distortionless-scaled holographic stereogram, and optical spatial
filtering of holographic stereogram images.
The achromatically imaged Fresnel zone plate is analyzed as a technique
of very general applicability which compensates for source incoherency in two-beam
type holographic arrangements. The emphasis is on physical interpretation
rather than mathematical formulation. Two simple graphical mnemonics are
developed for rapid analytical inspection of the effects of, respectively, temporal
and spatial incoherence of the source in any achromatically imaged zone plate
or Gabor in-line type holographic system.
The scalar wave function approximation of physical optics is used
throughout.</p