Phase-only optical image encryption and hiding based on normalization and orthogonalization phase-shifting algorithm

Jiaosheng Li; Xiaoxu Lu; Qinnan Zhang; Jindong Tian; Liyun Zhong

doi:10.1117/12.2548749

20 December 2019 Phase-only optical image encryption and hiding based on normalization and orthogonalization phase-shifting algorithm

Jiaosheng Li, Xiaoxu Lu, Qinnan Zhang, Jindong Tian, Liyun Zhong

Author Affiliations +

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 112092Z (2019) https://doi.org/10.1117/12.2548749
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

Optical encryption technology using phase-shifting interferometry (PSI) is widely used in many security fields, showing the advantages of parallel processing and the high security due to the information can be encrypted in multiple dimensions. The traditional PSI- based encryption methods are realized by the traditional multi-step phase-shifting algorithms (PSAs), although they are fast and accurate, the phase shifts deviation (PSD) caused by phase shifter detuning often affect the performance of the above methods. In order to solve this problem, a phase-only encryption method combining a normalization and orthogonalization phase-shifting algorithm (NOPSA) is proposed to eliminate the influence of PSD on the effective on decryption. First, the original image is phase encoded and encrypted by a phase key loaded on a liquid crystal spatial light modulator (SLM). Subsequently, the modulated reference light will be overlapped with the object wave to form interference pattern. Finally, the encrypted image hiding can be implemented based on NOPSA. Compared with the current PSI- based encryption methods, its obvious advantage is that when the phase shifts are not accurate or unknown, the proposed method can still achieve high quality encryption and hiding, which broadens the working conditions of PSI- based encryption methods.

Citation Download Citation

Jiaosheng Li, Xiaoxu Lu, Qinnan Zhang, Jindong Tian, and Liyun Zhong "Phase-only optical image encryption and hiding based on normalization and orthogonalization phase-shifting algorithm", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112092Z (20 December 2019); https://doi.org/10.1117/12.2548749

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KEYWORDS

Phase shifts

Image encryption

Optical image encryption

Charge-coupled devices

Image quality

Spatial light modulators

Lithium

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