The Research Of Robust Image Watermarking Algorithm

With the rapid development of multimedia and network, we can get information more and more convenient. But when the development of technology brings convenience to us, it also brings in some difficulties to solve. For example, when we send data file or writings through network, illegal individual or community may copy or spread the copyrightable works easily without permission of the author. How to availably prevent illegal copying and spreading is an important problem in copyright protection. Recently Digital watermarking is noticed broadly because of its behavior in the protection of multimedia copyright.This paper mainly researches into the image watermarking, as following.1. In the research of the behavior of SVM and the second generation watermarking, a new robust blind watermarking scheme based on SVM is proposed. Firstly, the Multi-scale Harris- Laplace detector is utilized to extract feature points, and then the local characteristic regions are adaptively constructed according to the characteristic scale theory, select some points from the regions as embedded points. The watermarking embedding and extraction achieve by using a preoperational technique based on support vector regression model to adjust the values of the selected pixels. The model is trained by learning the relationship between the selected pixel and statistical feathers of neighboring area. Experimental results show that the presented scheme has good image perceptual quality and high watermark robustness to common image processing operation and resynchronization attacks, specially, to JPEG compression.2. In the domain of confine detecting watermarking, we more concern to prevent others unscrambling the meanings of the watermarking. It is necessary to solve the restraint problem in the watermarking embedding and detecting meanly the secure of the watermarking. This comes up with higher secure demand to watermarking algorithm. So A more secure image watermarking scheme is proposed using the Visual Cryptography in the pretreatment of watermarking. Firstly, the Visual Cryptography is utilized to hide the watermarking into certain pictures and one of encriptive pictures is chosen as final watermarking. Then, some suitable blocks selected by fuzzy cluster from the deoriginal image are made Contourlet transforming. The watermarking is embedded on the maximal singular values of the coefficients. The watermarking detection is achieved just by superposing the detected information and the certain pictures. The procession needn't a great deal of operations and lots of Cryptography knowledge. Experimental results show that the presented scheme also has high watermark robustness to clipping and common image processing operation such as noise adding, filtering, JPEG compressing.