Abstract
Quality of holographic reconstruction image is seriously affected by undesirable messy fringes in polygon-based computer generated holography. Here, several methods have been proposed to improve the image quality, including a modified encoding method based on spatial-domain Fraunhofer diffraction and a specific LED light source. Fast Fourier transform is applied to the basic element of polygon and fringe-invisible reconstruction is achieved after introducing initial random phase. Furthermore, we find that the image with satisfactory fidelity and sharp edge can be reconstructed by either a LED with moderate coherence level or a modulator with small pixel pitch. Satisfactory image quality without obvious speckle noise is observed under the illumination of bandpass-filter-aided LED. The experimental results are consistent well with the correlation analysis on the acceptable viewing angle and the coherence length of the light source.
Highlights
Three-dimensional (3D) display techniques providing vivid reconstruction of 3D scenes have attracted lots of research interest [1,2,3]
The light field of virtual 3D models, which compose of triangles with texture [4, 5] or points with different intensities [6, 7], can be encoded into computer-generated hologram (CGH) using Rayleigh-Sommerfeld diffraction [8]
We propose a method on encoding the CGH for polygonal model by applying fast Fourier transform (FT) instead of analytical FT
Summary
Three-dimensional (3D) display techniques providing vivid reconstruction of 3D scenes have attracted lots of research interest [1,2,3]. One is known as numerical noise from the random phase introduced in the encoding process of phase-only CGH [14, 15] Another comes from the phase fluctuations of coherent light beam when it transmits through or reflects off a diffusive plane [16]. We propose a method on encoding the CGH for polygonal model by applying fast Fourier transform (FT) instead of analytical FT. Such method enables to avoid the subdivision of each polygon, and as a result, fringes inside the reconstructed triangle are gone and vivid objects with smooth surfaces appear. The experimental results are well consistent with the above analysis
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