Interactive computation of holograms using a lookup table
Abstract
Several methods of increasing the speed and simplicity of the computation of offaxis transmission holograms are presented, with applications to the realtime display of holographic images. the bipolar intensity approach allows for the realvalued linear summation of interference fringes, a factor of 2 speed increase, and the elimination of image noise caused by object selfinterference. An order of magnitude speed increase is obtained through the use of a precomputed lookup table containing a large array of elemental interference patterns corresponding to point source contributions from each of the possible locations in image space. Results achieved using a dataparallel supercomputer to computer horizontalparallax only holographic patterns containing six megasamples indicate that an image comprised of 10,000 points with arbitrary brightness (gray scale) can be computed in under 1 s. Implemented on a common workstation, the lookup table approach increases computation speed by a factor of 43.
 Publication:

Journal of Electronic Imaging
 Pub Date:
 January 1993
 DOI:
 10.1117/12.133376
 Bibcode:
 1993JEI.....2...28L