Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram
1
Photonics and Information Lab, Department of Electrical Engineering, National Yunlin University of Science and Technology, Douliu Yunlin 64002, Taiwan
2
Graduate Institute of Color and Illumination Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
*
Author to whom correspondence should be addressed.
Photonics 2020, 7(1), 1; https://doi.org/10.3390/photonics7010001
Received: 12 November 2019
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Revised: 12 December 2019
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Accepted: 17 December 2019
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Published: 18 December 2019
(This article belongs to the Section Optical Communication and Network)
We propose an angle multiplexing method for optics-based image encryption using a phase-only computer-generated hologram (POCGH) in the tilted Fresnel transform (TFrT) domain. Modified Gerchberg-Saxton algorithms, based on the three types of rotation manipulation in both the hologram and reconstruction planes, are used with their corresponding TFrT parameters to extract the phase-only functions (POFs) of the target images. All the extracted POFs are then phase-modulated and summed to obtain the final POCGH, which is capable of multiplexing and avoiding overlap in the reconstructed images. The computer simulation results show that the images corresponding to the various rotation manipulations at the hologram and image reconstruction planes can be successfully restored with high correlation coefficients. Due to the encrypted nature of the multiplexed images, a higher system security level can be achieved, as the images can only be correctly displayed when all the required parameters in the TFrT are available. The angle sensitivity on the image quality for each manipulation is also investigated.
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Keywords:
angle multiplexing; optical image encryption; computer generated hologram; phase retrieval; tilted Fresnel transform
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MDPI and ACS Style
Chang, H.T.; Wang, Y.-T.; Chen, C.-Y. Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram. Photonics 2020, 7, 1. https://doi.org/10.3390/photonics7010001
AMA Style
Chang HT, Wang Y-T, Chen C-Y. Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram. Photonics. 2020; 7(1):1. https://doi.org/10.3390/photonics7010001
Chicago/Turabian StyleChang, Hsuan T., Yao-Ting Wang, and Chien-Yu Chen. 2020. "Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram" Photonics 7, no. 1: 1. https://doi.org/10.3390/photonics7010001
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