中文摘要：

目的 可逆数字水印技术在遥感、医学、军事等众多领域有着广泛应用,而现有大数可逆水印算法需要依赖于附加信息,严重影响了嵌入容量,为此提出一种无附加信息的大容量可逆水印算法.方法 首先设计了一种类似双线性插值原理的图像放大方法,并利用该方法将载体图像放大为原来的4倍,放大图中有1/4的插值点保留了原始图像信息,其余插值点均可嵌入水印.为了在插值的同时同步嵌入水印,先利用随机函数选取水印嵌入位置,再由嵌入水印信息决定理论插值的最终取值,实现水印嵌入.结果 该方法保证了水印的均匀分布,而且最大限度地降低了嵌入水印对插值的影响,同时还提高了算法效率和水印安全性.与经典插值算法相比,生成的含水印图像质量较好,且对任何载体图像嵌入率均能达到0.75 bit/pixel.结论 大量实验结果表明,算法隐蔽性好、安全性高、嵌入率高、实用性强.

英文摘要：

Objective Reversible digital watermarking technology has been widely applied in many fields. Concerning most of the existing reversible watermarking algorithms need a lot of additional information; this paper presents a high capacity reversible watermarking algorithm, which does not need any additional information. This algorithm depends on the image in- terpolation space. Method First, we design a similar bilinear interpolation image amplification method, and enlarge the cover image by four times its original size. 1/4 pixels of the magnification image retain the original image information, and the other pixels can be embed the watermarking. During the interpolation process. We use a random function to select water- mark-embedding position first and then determine the rounding mode and achieve watermark embedding by the watermarking information and the theoretical value. Result This method ensures a uniform distribution of the watermarking and it also min- imizes the effect of the interpolation, while improving the security. Compared with the classical interpolation algorithms, the last image is better, and embedding rate can reach around 0. 75 bit/pixel. Conclusion Theoretical analysis and experimen- tal results show that the algorithm is reversible and effective and secure.