提出了一种制作加密的傅里叶变换全息图像的方法,通过光学系统或计算机系统将原始数字图像经过双随机相位模板调制并与参考光干涉生成加密的傅里叶变换全息图像。将加密的傅里叶变换全息图像作为水印可以叠加隐藏在载体数字图像中,用于证明载体数字图像的版权。通过打印和扫描实验证明了含水印数字图像,可以通过普通的印刷技术印制在证件中；印刷品中的含水印载体数字图像,可以通过扫描输入计算机变换生成数字图像,通过盲检测技术可以从中提取所含数字水印,从而证明印刷品的真实性,提高了防伪能力。

A method to fabricate encrypted Fourier transform holographs is provided. With optical system or computer, the original digital image is modulated by double random phase plates and interferes with the reference light, and then the encrypted Fourier transform holograph is created, which can be regarded as the watermark and hidden in a host image to guarantee the copyright authentication. The printing and scanning experiments prove that the digital images with watermark can be printed on the certificates with ordinary printing technology. The digital images with watermark can be scanned and input into the computer, and the digital watermark can be extracted with blind detection technology. The credibility of the printed matter is proved, and the anti-fake performance is improved.