数字全息水印在印刷半色调图像中的应用

在印刷半色调图像中嵌入特定信息可用于印刷品的保护和认证。设计了一种新颖的应用于非数字形式印刷半色调图像中的信息隐藏算法,将原始水印信息制成菲涅耳全息图,以此作为水印信息,利用离散小波变换算法嵌入到宿主图像中,以实现信息隐藏。该算法利用全息图独特的不可撕毁性来增强水印的鲁棒性。实验结果表明,该算法对图像半色调化攻击具有较好的鲁棒性。

Application of Digital Hologram Watermark in Printing Halftone Image

Printed halftone image embedded with specific information can be used for protection and authentication of the print. A novel information hiding algorithm for printing halftone image was designed, which transform original watermarking information into Fresnel hologram; the Fresnel hologram was then embedded into the host image as watermarking information with discrete wavelet transform algorithm to realize information hiding. The algorithm used unique hologram to enhance the robustness of watermark. The experimental results showed that the algorithm has better robustness to image halftone attack.