Chen Wen, Chen Xudong, Sheppard Colin J R
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
Opt Express. 2012 Feb 13;20(4):3853-65. doi: 10.1364/OE.20.003853.
We propose a new method using coherent diffractive imaging for optical color-image encryption and synthesis in the Fresnel domain. An optical multiple-random-phase-mask encryption system is applied, and a strategy based on lateral translations of a phase-only mask is employed during image encryption. For the decryption, an iterative phase retrieval algorithm is applied to extract high-quality decrypted color images from diffraction intensity maps (i.e., ciphertexts). In addition, optical color-image synthesis is also investigated based on coherent diffractive imaging. Numerical results are presented to demonstrate feasibility and effectiveness of the proposed method. Compared with conventional interference methods, coherent diffractive imaging approach may open up a new research perspective or can provide an effective alternative for optical color-image encryption and synthesis.
我们提出了一种在菲涅尔域中使用相干衍射成像进行光学彩色图像加密与合成的新方法。应用了一种光学多随机相位掩模加密系统，并且在图像加密过程中采用了基于纯相位掩模横向平移的策略。对于解密，应用迭代相位恢复算法从衍射强度图（即密文）中提取高质量的解密彩色图像。此外，还基于相干衍射成像对光学彩色图像合成进行了研究。给出了数值结果以证明所提方法的可行性和有效性。与传统干涉方法相比，相干衍射成像方法可能会开辟一个新的研究视角，或者为光学彩色图像加密与合成提供一种有效的替代方案。
