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【Kohei Suzuki】
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Advanced Imaging
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Diffraction, Gratings, and Holography
Real-time gradation-expressible amplitude-modulation-type electroholography based on binary-weighted computer-generated hologram
Download:549次
Ren Noguchi
1
Kohei Suzuki
1
Yoshiki Moriguchi
1
Minoru Oikawa
2
[ ... ]
Naoki Takada
2,*
Author Affiliations
Abstract
1
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2
Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3
Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
In amplitude-modulation-type electroholography, the binary-weighted computer-generated hologram (BW-CGH) facilitates the gradation-expressible reconstruction of three-dimensional (3D) objects. To realize real-time gradation-expressible electroholography, we propose an efficient and high-speed method for calculating bit planes consisting of BW-CGHs. The proposed method is implemented on a multiple graphics processing unit (GPU) cluster system comprising 13 GPUs. The proposed BW-CGH method realizes eight-gradation-expressible electroholography at approximately the same calculation speed as that of conventional electroholography based on binary computer-generated holograms. Consequently, we were able to successfully reconstruct a real-time electroholographic 3D video comprising approximately 180,000 points expressed in eight gradations at 30 frames per second.
gradation-expressible electroholography
binary-weighted computer-generated hologram
digital micromirror device
computer-generated hologram
PDF全文
Full Text
Chinese Optics Letters
2021, 19(11): 110501
Visual Optics and Displays
High-speed playback of spatiotemporal division multiplexing holographic 3D video stored in a solid-state drive using a digital micromirror device
Download:643次
Kohei Suzuki
1
Minori Tao
2
Yuki Maeda
1
Hirotaka Nakayama
3
[ ... ]
Naoki Takada
4,*
Author Affiliations
Abstract
1
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2
Faculty of Science, Kochi University, Kochi 780-8520, Japan
3
National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
4
Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
5
Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
We propose a high-speed playback method for the spatiotemporal division multiplexing electroholographic three-dimensional (3D) video stored in a solid-state drive (SSD) using a digital micromirror device. The spatiotemporal division multiplexing electroholography prevents deterioration in the reconstructed 3D video from a 3D object comprising many object points. In the proposed method, the stored data is remarkably reduced using the packing technique, and the computer-generated holograms are played back at high speed. Consequently, we successfully reconstructed a clear 3D video of a 3D object comprising approximately 1,100,000 points at 60 frames per second by reducing the reading time of the stored data from an SSD.
spatiotemporal division multiplexing electroholography
digital micromirror device
computer-generated hologram
high-speed playback
PDF全文
Full Text
Chinese Optics Letters
2021, 19(9): 093301
Holography
Real-time spatiotemporal division multiplexing electroholography for 1,200,000 object points using multiple-graphics processing unit cluster
Download:792次
Hiromi Sannomiya
1
Naoki Takada
2,*
Kohei Suzuki
1
Tomoya Sakaguchi
1
[ ... ]
Tomoyoshi Ito
4
Author Affiliations
Abstract
1
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2
Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3
National Astronomical Observatory of Japan, Mitaka 181-8588, Japan
4
Graduate School of Engineering, Chiba University, Inage-ku 263-8522, Japan
Computationally, the calculation of computer-generated holograms is extremely expensive, and the image quality deteriorates when reconstructing three-dimensional (3D) holographic video from a point-cloud model comprising a huge number of object points. To solve these problems, we implement herein a spatiotemporal division multiplexing method on a cluster system with 13 GPUs connected by a gigabit Ethernet network. A performance evaluation indicates that the proposed method can realize a real-time holographic video of a 3D object comprising ~1,200,000 object points. These results demonstrate a clear 3D holographic video at 32.7 frames per second reconstructed from a 3D object comprising 1,064,462 object points.
real-time electroholography
multiple-graphics processing unit cluster
graphics processing unit
spatiotemporal division multiplexing electroholography
PDF全文
Full Text
Chinese Optics Letters
2020, 18(7): 070901
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