基于光场成像原理和混沌系统的多图像加密方法

Multiple Image Encryption Method Based on Light Field Imaging Theory and Chaotic System

针对现有光学加密方法对加密系统要求高、受器件性能限制、加密效率低、解密图像易失真的局限性,提出一种基于光场成像原理和混沌系统的多图像加密方法.该方法利用混沌系统随机生成光场成像系统的个数与系统参数,并在计算机中构造出相应的多个光场成像系统;将多幅待加密图像拼接后置于光场成像系统中依次计算得到光场图像,通过提取光场图像的多幅子孔径图像并进行拼接,实现多幅图像的快速加密.解密过程为加密过程的逆过程.该方法将计算成像的方式引入加密过程,使加密不受硬件条件的限制,易于实现.实验结果表明,提出的算法密钥复杂度低,易于传输;对噪声有较好的鲁棒性,密钥空间大,密钥敏感度高,安全性好;加密效率高,解密图像无损失.在需要大量图像进行安全传输的领域具有广泛的应用前景.

In order to overcome the limitations of the existing optical encryption methods on high encryption system requirements,limited device performance,low encryption efficiency,and easy distortion of decrypted images,a multi-image encryption method based on the light field imaging principle and chaotic system was proposed.The method first generates random numbers through a chaotic system,and these numbers are used as the number of the light field imaging systems and the parameters of each system.Then multiple light field imaging systems are built according to the generated numbers in the computer.The images to be encrypted are spliced to a big image,and placed into the constructed light field imaging systems sequentially to obtain the corresponding light field images.By extracting and splicing the sub-aperture images of each light field image,the encryption of multiple images are achieved fast.The decryption process is the reverse of the encryption.The proposed method introduces the computing imaging technology into the encryption,which can avoid the limitation of real optical decives,and is easy to be achieved.The experimental results show that the proposed algorithm has low complexity of secure keys which can be transmitted easily.And it has good robustness to noise,large key space and high sensitivity of keys,which can provide high security.It also has high efficiency.The proposed method has widely potential uses in the fields of requiring plenty of images transmission with security.