Research And Implementation Of Robust Watermarking Hybrid Algorithm

With the rapid development of Internet technology in recent years,it has become extremely convenient to obtain various digital media resources from the Internet,which has also brought about copyright attribution issues such as illegal copying and random distribution of digital works.As an important branch of information hiding,digital watermark technology embeds copyright information into digital works without affecting the use value of digital works,which provides a basis for the certification of digital works 'copyright attribution.There are many types of digital watermarking algorithms.However,most algorithms only focus on a specific attack or a certain type of attack,and the robustness against other attacks is generally even poor.The digital products may be subject to various unintentional or intentional attacks in the process of dissemination.It is difficult to ensure that the embedded watermarks are not removed,and often the effective watermark information cannot be extracted,resulting in copyright disputes.In this paper,a hybrid watermarking algorithm is proposed for this problem.A variety of robust watermarking algorithms are used to embed the same watermark image in different parts of a single carrier image.Simulation experiments verify that the algorithm has good robustness to many possible attacks.The following is the main work done in this article:(1)Four image watermarking algorithms are designed and implemented.These four algorithms are based on DWT_SVD domain,DCT domain,spatial domain,and generating hologram embedded watermark images.These algorithms have certain complementary characteristics in terms of robustness.Some of them exhibit strong robustness to noise attacks,some can resist geometric attacks such as rotation,scaling,and flipping,and some can resist strong attacks.Some can effectively resist histogram adjustment attacks and can realize the blind extraction of watermarks.(2)A hybrid watermarking algorithm for gray-scale image segmentation is proposed.The carrier image is divided into four blocks,and the four robust sub-watermarking algorithms implemented above are used to embed the same watermark image into four blocks of a single carrier image.The experimental results show that,compared with the four-seed algorithm,the block multi-watermarking algorithm can resist more types and higher-strength attacks,and can realize the blind extraction of watermarks.It solves the problem that most robust watermarking algorithms are only robust to certain types of attacks,and improves the practicality of digital watermarking algorithms.(3)In order to solve the blocking problem of the robust watermarking hybrid algorithm for gray-scale image partitioning,and achieve transparent embedding,a multi-watermark hybrid algorithm for color images is proposed for color images.It uses the DWT_SVD sub-algorithm,DCT sub-algorithm,and hologram-based sub-algorithm to embed the same watermark image into the R,G,and B components of a single carrier image.Experimental results show that the algorithm has good invisibility and no blocking.It can resist more kinds of attacks and higher-strength attacks than sub-algorithms,and can realize blind extraction of watermarks.