摘要
研究了位于菲涅耳衍射区的随机相位掩模板对光学图像的置乱.在系统中不需要透镜,完全利用菲涅耳衍射进行图像加密,并利用分别放置在输入平面和变换平面的两块与统计无关的随机相位模板,将原始图像加密成随机噪声.单色平面波的波长λ,传播距离z1、z2和两块相位板及其排列顺序都可作为加密的密钥,既简化了系统又提高了安全性.
Random-phase marks in the Fresnel domain to scramble optical image are proposed. The system needn＇t any lens and image encryption in the system is completely achieved by Fresnel diffraction. The method can encrypt an original image to random noise by using two statistically independent random-phase masks put respectively in the input and transformed planes. The wavelength of monochrome plane wave, the distance of propagation and the phase codes, are used as secret code keys to encrypt the original image. The system is simplified and higher security is achieved.
出处
《上海理工大学学报》
EI
CAS
北大核心
2007年第2期179-182,共4页
Journal of University of Shanghai For Science and Technology
关键词
随机相位模板
菲涅耳变换
信息安全
图像置乱
random-phase marks
Fresnel transform
information security
image scrambler
