Abuturab Muhammad Rafiq
Appl Opt. 2014 Oct 10;53(29):6719-28. doi: 10.1364/AO.53.006719.
A new optical interference-based multiple-image encryption using spherical wave illumination and gyrator transform is proposed. In this proposal, each secret color image is divided into normalized red, green, and blue component images and independently encoded into corresponding phase-only component images. Then each phase-only component image of all the images are combined together to produce a single-phase-only component image as an input component image, which is bounded with a random phase mask to form a complex image. The two phase-only masks are analytically obtained from the inverse Fourier transformation of the complex image. The host image is chosen as the first phase-only mask, and the complex image hidden in the host image is regarded as the second phase-only mask. The spherical wave is generated to simultaneously illuminate phase-only masks. Then two modulated masks are gyrator transformed. The corresponding transformed images are phase truncated to obtain encrypted images and amplitude truncated to construct decryption keys. The decryption keys, angles of gyrator transform, wavelength and radius of the spherical wave, and individual decryption keys for authorized users are sensitive keys, which enhance the security layers of the system. The proposed system can be implemented by using optoelectronic architecture. Numerical simulation results demonstrate the flexibility of the system.
提出了一种基于光学干涉的多图像加密方法，该方法采用球面波照明和旋转器变换。在该方法中，每个秘密彩色图像被分割为归一化的红、绿、蓝分量图像，并独立编码为相应的纯相位分量图像。然后，将所有图像的每个纯相位分量图像组合在一起，生成一个单一的纯相位分量图像作为输入分量图像，该图像与随机相位掩模相结合形成一个复图像。通过对复图像进行傅里叶逆变换，解析得到两个纯相位掩模。将宿主图像选为第一个纯相位掩模，隐藏在宿主图像中的复图像视为第二个纯相位掩模。生成球面波以同时照明纯相位掩模。然后对两个调制掩模进行旋转器变换。对相应的变换图像进行相位截断以获得加密图像，并进行幅度截断以构建解密密钥。解密密钥、旋转器变换角度、球面波的波长和半径以及授权用户的个人解密密钥均为敏感密钥，这增强了系统的安全层。所提出的系统可以通过光电架构来实现。数值模拟结果证明了该系统的灵活性。
