CAJ | 학술논문

针对二维图像加密系统的安全性问题，本文提出一种融合分数傅里叶变换和图像置换技术的光学图像加密方案。首先，使用jigsaw变换算法将原始图像分解成若干子图，并随机平移子图；然后，利用Arnold变换对图像像素进行置乱；最后，采用分数傅里叶变换加密置乱图像，并迭代重复这些过程。将jigsaw排列指标、Arnold频率和分数傅里叶阶等参数组成一个密钥空间，通过仿真实验在光学实现方面评估算法性能。实验结果表明，本文提出的方案具有很好的灵活性和鲁棒性。
침대이유도상가밀계통적안전성문제，본문제출일충융합분수부리협변환화도상치환기술적광학도상가밀방안。수선，사용jigsaw변환산법장원시도상분해성약간자도，병수궤평이자도；연후，이용Arnold변환대도상상소진행치란；최후，채용분수부리협변환가밀치란도상，병질대중복저사과정。장jigsaw배렬지표、Arnold빈솔화분수부리협계등삼수조성일개밀약공간，통과방진실험재광학실현방면평고산법성능。실험결과표명，본문제출적방안구유흔호적령활성화로봉성。
For the security issue of two-dimensional image encryption, an optical image fusion fractional Fouri-er transform and image replacement techniques of encryption scheme is proposed. Firstly, jigsaw transform algo-rithm is used to decompose the original image into several sub graphs, shifting subgraph randomly. Then, Arnold transform (ART) is used to scramble pixel of image. Finally, scrambling image by using fractional Fourier transform, and repeat the process of iteration. The jigsaw array index, Arnold frequency and fractional Fourier order parameters constitute a key space. Through the simulation in the optical implementation evaluation of the performance of algo-rithm, experimental results show that proposed scheme has better flexibility and robustness.