Three-dimensional hologram generation method based on space-division

Abstract

The layer-based method for three-dimensional (3D) hologram generation suffers from reconstruction quality decreasing. On the basis of the layer-based method, a new method based on the idea of “space-division” is proposed. The method divides the object into small pieces, named spaces; for spaces with small number of points, the point-based method is used for hologram generation, to ensure the reconstruction quality; for spaces with large number of points, the fast Fourier transform method is used to ensure the computation efficiency. An index named “quality-time ratio” Q is defined, to synthetically evaluate the influence effect of the number of portions, the number of layers and the number of points to the effect of the algorithm. The simulation results show that, the increment of the number of portions improves Q the most effectively, which proves the validity of our method. The method is further tested by computer and optical reconstructions using different objects, and it is proved that the space partitioning method can obtain reconstructed images with the same quality in about 30% fewer time.