Computer-generated hologram using binary phase with an aperture

Chen, Wen

doi:10.1364/ao.56.009126

Cited by 10 publications

(3 citation statements)

References 52 publications

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“…The effectiveness and flexibility of the proposed cryptosystem have been validated by the numerical simulation results. In the future, the cylindrical diffraction might be applied to the optical image authentication [38,39].…”

Section: Discussionmentioning

confidence: 99%

Double‐image asymmetric cryptosystem using cylindrical diffraction and spectrum fusion and compression

Liu

Chen

et al. 2020

IET Optoelectronics

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A double-image asymmetric cryptosystem is proposed by using cylindrical diffraction and spectrum fusion and compression in the zigzag-scanned domain of discrete cosine transform (DCT). First, each plaintext of double image is converted into spectrum coefficients (SCs) by DCT, and the SCs are zigzag scanned. Second, the first 1/4 of SCs is resized to two low-frequency images, the second 1/4 of SCs is resized to two high-frequency images, while the last 1/2 of SCs is discarded. Third, the two low-frequency and two high-frequency images are fused and merged into three rounds of encryption process by using the complex combination, random phase encoding, and phase reserving-truncation in the cylindrical diffraction transform domain. Finally, the plaintexts of the double image are successfully encrypted into a ciphertext and three private keys with each only 1/8 and totally 1/2 of the size of the plaintext, which gains a high compression efficiency. In the proposed cryptosystem, the quality of the reconstructed image is improved due to the compression in the zigzag-scanned DCT domain, and the security is improved owing to the asymmetric cylindrical diffraction and spectrum-fusion algorithm. The effectiveness and flexibility of the proposed cryptosystem have been validated by the numerical simulation results. Proposed asymmetric cryptosystem PRT in CDT domainAccording to the cylindrical diffraction theory in [32,33], the object and the observation surfaces are concentric cylindrical surfaces. Figs. 1a and b show the two, inside-out propagation (IOP)

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Section: Discussionmentioning

confidence: 99%

Double‐image asymmetric cryptosystem using cylindrical diffraction and spectrum fusion and compression

Liu

Chen

et al. 2020

IET Optoelectronics

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“…The 1D intensity points generated by correlated photon imaging are hidden into phase-only masks for optical watermarking. The proposed approach provides a promising strategy for optical information security [32][33][34][35][36][37][38][39].…”

Section: Discussionmentioning

confidence: 99%

Computer-generated hologram marked by correlated photon imaging

Chen

2018

Appl. Opt.

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The computer-generated hologram (CGH) has been studied for many applications. In this paper, CGH is watermarked by correlated photon imaging. An input image is encoded into two cascaded phase-only masks by using the CGH principle. Subsequently, two different marks are independently encoded into one-dimensional (1D) intensity points by using correlated photon imaging (or ghost imaging), and the recorded 1D intensity points are embedded into the extracted phase masks for optical watermarking. During the decoding, the input is recovered by using two watermarked phase masks. To verify copyright of the recovered input image, information embedded in two phase-only masks is retrieved and used to decode the hidden marks. The decoded marks do not visually render clear information due to only a few measurements and, instead, are authenticated. It is illustrated that the quality of the recovered input image is high, and a different imaging approach can be applied in the CGH system for optical watermarking. The proposed approach provides a promising strategy for optical information security.

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“…Besides traditional image information security, [1,2] optical information security also has a lot of room to develop. Different kinds of optical information processing technologies have been put into application to realize more efficient security systems, such as phase retrieval algorithms, double random phase encoding (DRPE) technique, [3][4][5][6] digital holography, [7][8][9] phaseshifting interferometry, [10][11][12] ghost imaging, [13][14][15][16][17][18][19] aperture movement, [20] and sparse-phase multiplexing. [21] Phase retrieval is a typical technology for optical encryption and authentication, which usually encodes the information of the secret image into one or several pseudo-random phase masks.…”

Section: Introductionmentioning

confidence: 99%

Phase retrieval algorithm for optical information security*

et al. 2019

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As a typical technology for optical encryption, phase retrieval algorithms have been widely used in optical information encryption and authentication systems. This paper presents three applications of two-dimensional (2D) phase retrieval for optical encryption and authentication: first, a hierarchical image encryption system, by which multiple images can be hidden into cascaded multiple phase masks; second, a multilevel image authentication system, which combines (t, n) threshold secret sharing (both t and n are positive integers, and t ≤ n ) and phase retrieval, and provides both high-level and low-level authentication; and finally, a hierarchical multilevel authentication system that combines the secret sharing scheme based on basic vector operations and the phase retrieval, by which more certification images can be encoded into multiple cascaded phase masks of different hierarchical levels. These three phase retrieval algorithms can effectively illustrate phase-retrieval-based optical information security. The principles and features of each phase-retrieval-based optical security method are analyzed and discussed. It is hoped that this review will illustrate the current development of phase retrieval algorithms for optical information security and will also shed light on the future development of phase retrieval algorithms for optical information security.

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Computer-generated hologram using binary phase with an aperture

Cited by 10 publications

References 52 publications

Double‐image asymmetric cryptosystem using cylindrical diffraction and spectrum fusion and compression

Double‐image asymmetric cryptosystem using cylindrical diffraction and spectrum fusion and compression

Computer-generated hologram marked by correlated photon imaging

Phase retrieval algorithm for optical information security*

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