• Chinese Optics Letters
  • Vol. 19, Issue 11, 110501 (2021)
Ren Noguchi1, Kohei Suzuki1, Yoshiki Moriguchi1, Minoru Oikawa2, Yuichiro Mori2, Takashi Kakue3, Tomoyoshi Shimobaba3, Tomoyoshi Ito3, and Naoki Takada2、*
Author Affiliations
  • 1Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
  • 2Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
  • 3Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
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    Binary PWM sequence patterns corresponding to gray levels 76, 127, and 255.
    Fig. 1. Binary PWM sequence patterns corresponding to gray levels 76, 127, and 255.
    Light intensities of object points reconstructed from BW-CGHs and conventional binary CGH.
    Fig. 2. Light intensities of object points reconstructed from BW-CGHs and conventional binary CGH.
    Assignment of the object points of the 3D object to the bit planes.
    Fig. 3. Assignment of the object points of the 3D object to the bit planes.
    Simple method for calculating the respective bit planes B0, B1, and B2.
    Fig. 4. Simple method for calculating the respective bit planes B0, B1, and B2.
    Proposed method for calculating bit planes B0, B1, and B2 by grouping the gradation values of the object points.
    Fig. 5. Proposed method for calculating bit planes B0, B1, and B2 by grouping the gradation values of the object points.
    Bit-plane flags in the respective groups.
    Fig. 6. Bit-plane flags in the respective groups.
    Multi-GPU cluster electroholography system with a single SLM.
    Fig. 7. Multi-GPU cluster electroholography system with a single SLM.
    Pipeline processing for real-time gradation-expressible electroholography based on BW-CGH.
    Fig. 8. Pipeline processing for real-time gradation-expressible electroholography based on BW-CGH.
    Eight-gradation holographic 3D video reproduction using bit plans B0, B1, and B2 on a DMD.
    Fig. 9. Eight-gradation holographic 3D video reproduction using bit plans B0, B1, and B2 on a DMD.
    Eight-gradation holographic 3D video reproduction using the bit planes B0, B1, and B2 on a DMD.
    Fig. 10. Eight-gradation holographic 3D video reproduction using the bit planes B0, B1, and B2 on a DMD.
    Optical setup used in the evaluation experiment.
    Fig. 11. Optical setup used in the evaluation experiment.
    Gradation values of 3D model “Jack-o’-lantern” and “Stanford bunny.”
    Fig. 12. Gradation values of 3D model “Jack-o’-lantern” and “Stanford bunny.”
    Snapshot of a reconstructed 3D video “Jack-o’-lantern” (Data File 1).
    Fig. 13. Snapshot of a reconstructed 3D video “Jack-o’-lantern” (Data File 1).
    Snapshot of a reconstructed 3D video “Stanford bunny” (Data File 2).
    Fig. 14. Snapshot of a reconstructed 3D video “Stanford bunny” (Data File 2).
    Measured light intensities obtained from the snapshots of the reconstructed 3D videos (Data File 1 and Data File 2).
    Fig. 15. Measured light intensities obtained from the snapshots of the reconstructed 3D videos (Data File 1 and Data File 2).
    CPUIntel Core i7 7800X (Clock speed: 3.5 GHz)
    Main memoryDDR4-2666 16 GB
    OSLinux (CentOS 7.6 x86_64)
    SoftwareNVIDIA CUDA 10.1 SDK, OpenGL, MPICH 3.2
    GPU boardNVIDIA GeForce GTX 1080 Ti
    Table 1. Specifications of the Personal Computers Comprising the Multi-GPU Cluster System
     Number of Object Points
    Jack-o’-LanternStanford Bunny
    B096,96054,302
    B1100,84052,758
    B297,91221,857
    Group 728,4887380
    Group 626,56031,969
    Group 623,51211,285
    Group 519,3523668
    Group 423,0642414
    Group 222,72810,995
    Group 121,896778
    Table 2. Number of the Object Points of 3D Models for the Duplicate Calculation and the Proposed Methods
     Display Time Interval [ms]Speed-up
    Duplicate Calculation MethodProposed Method
    Jack-o’-lantern591.18335.951.76
    Stanford bunny264.15141.531.87
    Table 3. Comparison of the Display Time Interval using a PC with a Single GPU
     Display Time Interval [ms]Speed-up
    Duplicate Calculation MethodProposed Method
    Jack-o’-lantern57.2129.891.91
    Stanford bunny29.8713.492.21
    Table 4. Comparison of the Display Time Interval using the Multi-GPU Cluster System
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    Ren Noguchi, Kohei Suzuki, Yoshiki Moriguchi, Minoru Oikawa, Yuichiro Mori, Takashi Kakue, Tomoyoshi Shimobaba, Tomoyoshi Ito, Naoki Takada. Real-time gradation-expressible amplitude-modulation-type electroholography based on binary-weighted computer-generated hologram[J]. Chinese Optics Letters, 2021, 19(11): 110501
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    Category: Diffraction, Gratings, and Holography
    Received: May. 7, 2021
    Accepted: Sep. 14, 2021
    Posted: Sep. 15, 2021
    Published Online: Oct. 14, 2021
    The Author Email: Naoki Takada (ntakada@is.kochi-u.ac.jp)