Method for making secondary holograms from multiplexed holograms or integral photographs wherein the screen effect is eliminated

Abstract

Abstract A METHOD IS DESCRIBED FOR FORMING SECONDARY HOLOGRAMS FROM EITHER A MULTIPLEXED (I.E. SAMPLED) HOLOGRAM OR FROM AN INTEGRAL PHOTOGRAPH WHEREIN THE SCREEN EFFECT NORMALLY PRODUCED BY EITHER THE MULTIPLEXED HOLOGRAM OR THE INTEGRAL PHOTOGRAPH IS ELIMINATED. AN INTEGRAL PHOTOGRAPH IS A PHOTOGRAPHIC RECORDING OF AN OBJECT THROUGH A PLANE ARRAY OF FLY''S EYES LENSES FROM WHICH THREEDIMENSIONS REAL AND VIRTUAL IMAGES CAN BE LATER OBSERVED. A MULTIPLEXED OR SAMPLED HOLOGRAM IS A HOLOGRAM WHICH IS FORMED BY INTERLACING A PLURALITY OF HOLOGRAMS IN A SINGLE EMULSION USING A MASK PLACED IN THE REFERENCE AND/ OR THE INTEGRAL PHOTOGRAPH IS ELIMINATED. AN INTEGRAL PHOTOGRAPH OR HOLOGRAM OF AN INTEGRAL PHOTOGRAPH, A SCREEN OR GRID EFFECT IS PRODUCED DUE TO THE FACT THAT THE FLY''S EYE LENS ARRAY IS DISCONTINUOUS AND THE AREAS BETWEEN THE LENSES IN THE ARRAY DO NOT RECORD ANY INFORMATION. IN OBSERVING THE IMAGE FROM A MULTIPLEXED HOLOGRAM, A SIMILAR SCREEN OR GRID EFFECT DUE TO THE FACT THAT A MASK WAS EMPLOYED IN PRODUCING A MULTIPLEXED HOLOGRAM. IN THE METHOD OF THE PRESENT INVENTION, A SECONDARY HOLOGRAM IS RECORDED IN THE FOURIER TRANSFORM PLANE OF THE IMAGE AND THE SECONDARY HOLOGRAM PLATE IS TRANSLATED IN THE FOURIER PKANE A NUMBER OF TIMES AND A SEPARATE RECORDING OF THE IMAGE IS SUPERIMPOSED FOR EACH TRANSLATION. SINCE THE SECONDARY HOLOGRAM PLATE IS IN THE FOURIER PLANE OF THE IMAGE, THE IMAGE DOES NOT SHIFT DUE TO THE TRANSLATION OF THE PLATE. HOWEVER, SINCE THE SECONDARY HOLOGRAM PLATE IS NOT IN THE FOURIER PLANE OF THE INTEGRAL PHOTOGRAPH OR THE MULTIPLEXED HOLOGRAM AS THE CAUSE MAY BE, THE GRID WILL BE RECORDED AT DIFFERENT LOCATION ON THE SECONDARY HOLOGRAM FOR EACH TRANSLATION, THAT IS, THE GRID WILL SHIFT DUE TO THE TRANSLATION OF THE HOLOGRAM. THE SHIFTING OF THE GRID FOR THE SUCCESSIVE RECORDINGS WILL CAUSE IT TO SMEAR OUT AND WILL NOT BE VIEWABLE IN THE RESULTANT SECONDARY HOLOGRAM.

Inventors

• 👤 Keith S Pennington
• 👤 Robert V Pole

Bibliographic Details