Advanced 360-Degree Integral-Floating Display Using a Hidden Point Removal Operator and a Hexagonal Lens Array

Erdenebat, Munkh-Uchral; Dashdavaa, Erkhembaatar; Piao, Yan; Yoo, Kwan‐Hee; Baasantseren, Ganbat; Kim, Young‐Min; Kim, Nam

doi:10.3807/josk.2014.18.6.706

Cited by 10 publications

(3 citation statements)

References 23 publications

(23 reference statements)

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“…In addition, the data amount for a given field of view in curved hologram is smaller than a planar hologram [2]. Furthermore, cylindrical geometry has proved efficient in 3D volumetric imaging, such as computed tomography, magnetic resonance images, and integral-floating display [3]. However, the heavy computation load is one of the issues.…”

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confidence: 99%

Fast calculation method of computer-generated cylindrical hologram using wave-front recording surface

Zhao

Piao

et al. 2015

Opt. Lett.

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Fast calculation method for a computer-generated cylindrical hologram (CGCH) is proposed. The method consists of two steps: the first step is a calculation of a virtual wave-front recording surface (WRS), which is located between the 3D object and CGCH. In the second step, in order to obtain a CGCH, we execute the diffraction calculation based on the fast Fourier transform (FFT) from the WRS to the CGCH, which are in the same concentric arrangement. The computational complexity is dramatically reduced in comparison with direct integration method. The simulation results confirm that our proposed method is able to improve the computational speed of CGCH.

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confidence: 99%

Fast calculation method of computer-generated cylindrical hologram using wave-front recording surface

Zhao

Piao

et al. 2015

Opt. Lett.

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“…There are many research efforts implemented for this technique, such as the extension of the depth of field (DOF) [5,6] , the enlarging of the viewing angle [7][8][9] , the highly efficient computer-generated encryption image method [10] , and the improvement of resolution [11,12] . On the base of the above-mentioned studies, it can be concluded that II has the potential to realize the floating 3D effect [13] . According to the primary aberration theory, lens distortion seriously deteriorates the 3D image quality.…”

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confidence: 99%

Distortion correction for the elemental images of integral imaging by introducing the directional diffuser

Sang

Gao

et al. 2018

Chin. Opt. Lett.

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A distortion correction method for the elemental images of integral imaging (II) by utilizing the directional diffuser is demonstrated. In the traditional II, the distortion originating from lens aberration wraps elemental images and degrades the image quality severely. According to the theoretical analysis and experiments, it can be proved that the farther the three-dimensional image is displayed from the lens array, the more serious the distortion is. To analyze the process of eliminating lens distortion, one lens and its corresponding elemental image are separated from the traditional II. By introducing the directional diffuser, the aperture stop of the separated optical system changes from the eye's pupil to the lens. In terms of contrast experiments, the distortion of the improved display system is corrected effectively. In the experiment, when the distance between the reconstructed image and lens array is equal to 120 mm, the largest lens distortion is decreased from 46.6% to 3.3%.

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“…Advanced glass lenses are important components to many modern technologies [1][2][3][4][5]. A lithography process in the semiconductor industry, for example, relies on the quality of its optical system [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Precision glass molding: Toward an optimal fabrication of optical lenses

Zhang

Liu

2017

Front. Mech. Eng.

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It is costly and time consuming to use machining processes, such as grinding, polishing and lapping, to produce optical glass lenses with complex features. Precision glass molding (PGM) has thus been developed to realize an efficient manufacture of such optical components in a single step. However, PGM faces various technical challenges. For example, a PGM process must be carried out within the super-cooled region of optical glass above its glass transition temperature, in which the material has an unstable non-equilibrium structure. Within a narrow window of allowable temperature variation, the glass viscosity can change from 10 5 to 10 12 Pa$s due to the kinetic fragility of the super-cooled liquid. This makes a PGM process sensitive to its molding temperature. In addition, because of the structural relaxation in this temperature window, the atomic structure that governs the material properties is strongly dependent on time and thermal history. Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected changes in density and refractive index. This review will discuss some of the central issues in PGM processes and provide a method based on a manufacturing chain consideration from mold material selection, property and deformation characterization of optical glass to process optimization. The realization of such optimization is a necessary step for the Industry 4.0 of PGM.

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Advanced 360-Degree Integral-Floating Display Using a Hidden Point Removal Operator and a Hexagonal Lens Array

Cited by 10 publications

References 23 publications

Fast calculation method of computer-generated cylindrical hologram using wave-front recording surface

Fast calculation method of computer-generated cylindrical hologram using wave-front recording surface

Distortion correction for the elemental images of integral imaging by introducing the directional diffuser

Precision glass molding: Toward an optimal fabrication of optical lenses

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