COMPUTER-GENERATED HOLOGRAMS IMPROVED BY A GLOBAL ITERATIVE CODING

A global iterative coding method for computer-generated holograms (CGH ) is introduced. The method is based on the iterative correction of a CGH using standard Lee coding. The correction, i.e., the difference be tween the desired and the obtained reconstruction, is coded and added to the current CGH. The coding and weighting factors are introduced to control the speed of convergence and the SNR. Advantages lie in low c omputing time and improvement of the object SNR, the neighborhood SNR, and the background SNR. Reducing the standard deviation of the phase of the reconstructed object also results. A slight improvement of the diffraction efficiency is also observed. The comparison is realized us ing the Lee interferogram method as a reference. This method is tested on binary and complex gray-level objects. Simulation results and opti cal reconstruction are also presented.