基于多波长光源计算鬼成像的光学加密

Optical encryption scheme based on computational ghost imaging with multiple wavelength light source

提出了一种新的基于多波长光源计算鬼成像的光学加密方案.方案使用红绿蓝三色光产生多个随机散斑,将散斑序列的相位掩膜矩阵调制成随机Toeplitz矩阵,散斑的对应波长是随机三色光波长,相位掩膜和波长同时作为光学加密的两个密钥.所有散斑经过相同的轴向距离到达物体后,最终利用压缩感知技术恢复物体图像.数值仿真表明,方案在双密钥全部已知条件下能完全恢复物体图像,密钥窃取率低于60%不能获得物体图像信息.获得同等质量的图像,方案所需的测量次数和传输密钥量仅是基于计算鬼成像的双密钥光学加密方案的1/3.

A new optical encryption(OE) scheme based on multiple wavelength light source for computational ghost imaging(CGI) is proposed. In the scheme, using red-green-blue three color light to generate multiple random speckles, the phase mask matrix of speckles sequence is modulated into a random Toeplitz matrix.The corresponding wavelengths of speckles are random three color light wavelengths. The phase mask and wavelength are simultaneously used as two keys for optical encryption. After all speckles arrive at an object at the same axial distance, the compressed sensing technology is used to restore the object image. Numerical simulation shows that the scheme can completely restore the object image under all known conditions of the dual key, and the key stealing rate is less than 60%, which can not get the image information of the object. To get the same quality image, the number of measurement and transmission key is only 1/3 based on the double key optical encryption scheme of ghost imaging.