Journal
OPTICS AND LASERS IN ENGINEERING
Volume 77, Issue -, Pages 191-202Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2015.09.002
Keywords
Optical encryption; Color image; Coherent diffractive imaging
Categories
Funding
- National Natural Science Foundation of China [61505091]
- Nanyang Normal University [QN2015013]
- Fundamental and Cutting-edge Technology Research Program of Henan Province [142300410454]
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By introducing the theta modulation technique into the diffractive-imaging-based optical scheme, we propose a novel approach for color image encryption. For encryption, a color image is divided into three channels, i.e., red, green and blue, and thereafter these components are appended by redundant data before being sent to the encryption scheme. The carefully designed optical setup, which comprises of three 4f optical architectures and a diffractive-imaging-based optical scheme, could encode the three plaintexts into a single noise-like intensity pattern. For the decryption, an iterative phase retrieval algorithm, together with a filter operation, is applied to extract the primary color images from the diffraction intensity map. Compared with previous methods, our proposal has successfully encrypted a color rather than grayscale image into a single intensity pattern, as a result of which the capacity and practicability have been remarkably enhanced. In addition, the performance and the security of it are also investigated. The validity as well as feasibility of the proposed method is supported by numerical simulations. (c) 2015 Elsevier Ltd. All rights reserved.
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