Gradual and random binarization of gray-scale holograms

Zhang, E.; Noehte, S.; Dietrich, Christoph H.; Mäenner, R.

doi:10.1364/ao.34.005987

Cited by 31 publications

(17 citation statements)

References 17 publications

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“…Mathematically, the revised frequency spectrum in Fig. 3 can be expressed as (6) whereĨ 3 (ω x , ω y ) andĨ 4 (ω x , ω y ) denote the sequences of replica images of the baseband spectrum along the ±45…”

Section: H(x Y)mentioning

confidence: 99%

“…(6). As the replica images are nonoverlapping, the line samples I 1 (x, y) and I 2 (x, y) corresponding to the first termĨ D (ω x , ω y ) of the equation are retained in the downsampled image I D (x, y).…”

Section: H(x Y)mentioning

confidence: 99%

“…These include the work reported in Refs. [5][6][7][8][9][10][11]. Methods on the generation of binary holograms in an iterative manner have been reported in Refs.…”

mentioning

confidence: 99%

“…Methods on the generation of binary holograms in an iterative manner have been reported in Refs. [12][13][14]. However, to our knowledge, little work has been done on the analysis and generation of binarized Fresnel CGHs in a non-iterative manner.…”

mentioning

confidence: 99%

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

Cheung¹,

Tsang²,

Poon³

et al. 2011

Chin. Opt. Lett.

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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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Section: H(x Y)mentioning

confidence: 99%

Section: H(x Y)mentioning

confidence: 99%

“…These include the work reported in Refs. [5][6][7][8][9][10][11]. Methods on the generation of binary holograms in an iterative manner have been reported in Refs.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

Cheung¹,

Tsang²,

Poon³

et al. 2011

Chin. Opt. Lett.

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show abstract

“…In the past there were investigations to address the distortions caused by quantization of holograms. These include, for example, the early works of Krishna and Naidu [6], Zhang et al [7], Zhao and Surrel [8], and more recently, Mills and Yamaguchi [9] on phase-shifting holography, Cable et al [10] on binary Fourier holograms, and Nozaki and Chen [11] and Moreno et al [12] on kinoform and detour phase holograms. Methods for generation of a binary hologram in an iterative manner have been reported in [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Computer generation of binary Fresnel holography

et al. 2011

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Binarization of Fresnel holograms by direct thresholding based on the polarity of the fringe pattern is studied. It is found that if the hologram is binarized (i.e., for black and white hologram pixels) in this manner, only the edges of the object are preserved in the reconstructed image. To alleviate the errors caused by binarization, the use of error diffusion has been routinely employed. However, the reconstructed image using such standard technique is heavily contaminated with random noise. In this paper, we propose a novel noniterative method for generating Fresnel holograms that are suitable for binarization. Our method is capable of preserving good visual quality on the reconstructed images.

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Production of binary holograms with laser punch

Iwai

Nakajima

2001

Electron Comm Jpn Pt II

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SUMMARYA method for fabrication of binary holograms with a laser punch is proposed. In the present method, the hologram pattern is first computed in a computer so that a given reconstruction image can be obtained. This hologram pattern is binarized by a newly proposed algorithm. Based on the binary hologram pattern, laser illumination and motion of the stage with a film attached are computer controlled. In this way, holes with a fixed diameter are punched into the film to form binary holograms. Further, in order to verify the methods effectiveness, it is confirmed that excellent reconstruction images can be obtained from the holograms fabricated by the proposed method. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 84(10): 1723, 2001

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Gradual and random binarization of gray-scale holograms

Cited by 31 publications

References 17 publications

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

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

Computer generation of binary Fresnel holography

Production of binary holograms with laser punch

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