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提出了全数字全息术在计算机图像信息隐藏中的应用。待隐藏的秘密信息以及公开的承载信息均为灰度级静止图像。首先对待隐藏的计算机信息图进行全息变换,即通过计算全息图的制作步骤制作出全息图的图像文件,然后再进行Arnold对称性变换。在此基础上,将秘密图像嵌入到承载图像的DCT域的中频系数中。全数字全息术的引入进一步增强了隐藏图像的透明性,通过控制制作全息图时的参数可起到加密的作用,相当于增加了一把秘密钥匙,具有较高的保密性和稳健性。
The application of digital holography in computer image information hiding is proposed. The secret information to be hidden and the publicly carried information are all gray-level still images. First, the hidden computer information map for holographic transformation, that is, by calculating the hologram production steps to create a hologram image file, and then Arnold symmetry transformation. On this basis, the secret image is embedded into the IF coefficients of the DCT domain carrying the image. The introduction of all-digital holography further enhances the transparency of the hidden image. The parameters of the hologram can be encrypted by controlling the parameters, which is equivalent to adding a secret key with high confidentiality and robustness.