Research Of Watermark-based Digital Image Features Authentication

In recent years,The continuous development of image authentication has been hotspot in academia and engineering community.The traditional encryption and digital signature technology both can apply to the image authentication,But they both have some drawbacks,such as:data redundancy and the increased amount of data management.The image authentication based on watermarking is the important direction to solve these problems,it has strong research and application value,it is not only could embed the watermark information into redundant space,but also protect the data after decryption. In this paper, we major in research of watermark-based digital image features authentication,we choose digital image as the research target, we first introduce the basic theory of digital watermarking,then carried on the preliminary exploration in the image authentication based on watermarking.Following are our works:In the first,we have proposed a perceptual image hashing based on robust entropies features and Zernike moments. This approach calculates the reference orientation by Zernike moment and calculates the entropies of equal area ring and angle as perceptual feature. Then get the hash sequence by Quantization. We use euclidean distance to measure pictures' similarity. The experimental results show that the proposed algorithm has good robustness on additive noise?JPEG compression? Geometric Attacks and have good discrimination for different images.It has clear advantage on the gamma correction performance than the NMF and R&ASCH.Then we have proposed a semi-fragile watermarking algorithm based on DCT transform.we divided the image into same area and same angel,after this step the image has been divided into many fans,then do the DCT transform and the watermark embedding to these fans.The experimental results show that the proposed algorithm has good invisibility and has good robustness on JPEG compression and rotation,it also has good vulner ability during a vicious attack.In this paper,Around the theme of image authentication based on watermarking, first proposed a new image hashing algorithm, experiments showed that the algorithm is efficient and has a certain practicality; then semi-fragile watermark has been implemented, it lay the foundation for the design of related applications. I believe our works will contribute to the further development of image authentication technology based on wartermarking.