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Enhanced method for the generation of binary Fresnel holograms based on grid-cross downsampling

W.K.Cheung  Peter Tsang  T.C.Poon  周常河  
【摘要】:Past research has demonstrated that digital Fresnel holograms can be binarized in a non-iterative manner by downsampling the source image with a grid lattice prior to the hologram generation process.The reconstructed image of a hologram that is binarized with this approach is superior in quality compared with that obtained with direct thresholding,half-toning,and error diffusion.Despite the success,the downsampling mechanism results in a prominent texture of regularly spaced voids in the shaded regions.To alleviate this problem,an enhanced non-iterative method for the generation of binary Fresnel holograms is presented.Our method is based on a multi-direction line-sampling formed by a combined grid and cross lattice,which is capable of preserving a more solid texture in the shaded regions and enhancing the visual quality of the reconstructed image.Computer simulations and optical reconstructions are shown to demonstrate the effectiveness of our proposed technique.

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