Computer-generated holograms (CGHs) are used in holographic three-dimensional (3D) displays and holographic projections. The quality of the reconstructed images using phase-only CGHs is degraded because the amplitude of the reconstructed image is difficult to control. Iterative optimization methods such as the Gerchberg–Saxton (GS) algorithm are one option for improving image quality. They optimize CGHs in an iterative fashion to obtain a higher image quality. However, such iterative computation is time-consuming, and the improvement in image quality is often stagnant. Recently, deep learning-based hologram computation has been proposed. Deep neural networks directly infer CGHs from input image data. However, it is limited to reconstructing images that are the same size as the hologram. In this study, we use deep learning to optimize phase-only CGHs generated using scaled diffraction computations and the random phase-free method. By combining the random phase-free method with the scaled diffraction computation, it is possible to handle a zoomable reconstructed image larger than the hologram. In comparison to the GS algorithm, the proposed method optimizes both high quality and speed.
Ishii, Y, Shimobaba, T, Blinder, D, Birnbaum, T, Schelkens, P, Kakue, T & Ito, T 2022, 'Optimization of phase-only holograms calculated with scaled diffraction calculation through deep neural networks', Appl. Phys. B, vol. 128, no. 2, 22, pp. 1-11. https://doi.org/10.1007/s00340-022-07753-7
Ishii, Y., Shimobaba, T., Blinder, D., Birnbaum, T., Schelkens, P., Kakue, T., & Ito, T. (2022). Optimization of phase-only holograms calculated with scaled diffraction calculation through deep neural networks. Appl. Phys. B, 128(2), 1-11. Article 22. https://doi.org/10.1007/s00340-022-07753-7
@article{b1b3b3a6b3a44477871c25a2fb38f0c5,
title = "Optimization of phase-only holograms calculated with scaled diffraction calculation through deep neural networks",
abstract = "Computer-generated holograms (CGHs) are used in holographic three-dimensional (3D) displays and holographic projections. The quality of the reconstructed images using phase-only CGHs is degraded because the amplitude of the reconstructed image is difficult to control. Iterative optimization methods such as the Gerchberg–Saxton (GS) algorithm are one option for improving image quality. They optimize CGHs in an iterative fashion to obtain a higher image quality. However, such iterative computation is time-consuming, and the improvement in image quality is often stagnant. Recently, deep learning-based hologram computation has been proposed. Deep neural networks directly infer CGHs from input image data. However, it is limited to reconstructing images that are the same size as the hologram. In this study, we use deep learning to optimize phase-only CGHs generated using scaled diffraction computations and the random phase-free method. By combining the random phase-free method with the scaled diffraction computation, it is possible to handle a zoomable reconstructed image larger than the hologram. In comparison to the GS algorithm, the proposed method optimizes both high quality and speed.",
author = "Yoshiyuki Ishii and Tomoyoshi Shimobaba and David Blinder and Tobias Birnbaum and Peter Schelkens and Takashi Kakue and Tomoyoshi Ito",
note = "Funding Information: This work was partially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 19H04132 and 19H1097, the joint JSPS-FWO scientific cooperation program (VS07820N) and the Research Foundation—Flanders (FWO), Junior postdoctoral fellowship (12ZQ220N). Publisher Copyright: {\textcopyright} 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. Copyright: Copyright 2022 Elsevier B.V., All rights reserved.",
year = "2022",
month = feb,
doi = "10.1007/s00340-022-07753-7",
language = "English",
volume = "128",
pages = "1--11",
journal = "Appl. Phys. B",
issn = "0946-2171",
publisher = "Springer Verlag",
number = "2",
}