抄録
We present a way of using a computer simulation to reconstruct gray-level images from computer-generated Fresnel holograms (Fresnel CGHs) using a two-dimensional (2D) image as an object. The interference fringes formed with spherical object waves emitting from 2D-image pixels and a plane reference wave were recorded as the sum of Fresnel zone plates at a CGH plane. It is assumed that the amplitude of the object wave is proportional to the pixel intensity of the 2D image. Reconstructed images from the Fresnel CGH are obtained by applying the fast Fourier transform algorithm to the Fresnel-Kirchhoff diffraction integral. The simulations were executed by changing parameters such as a bit number for CGH data recordings and a sampling interval of the interference fringes at the CGH plane, and some simulation results are presented; recording data with a resolution of 5 or more bits appears to be the best way to construct high-quality images.
