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With the development of multimedia technology and the Internet, multimedia digital watermarking technology to protect digital information security as an effective means to become a research hotspot. Image watermarking is author information or other copyright information to images, text, or other forms of digital sequence embedded into the original carrier image, so as to achieve the digital image copyright protection and so on. Transform domain image watermarking due to good invisibility and robustness characteristics favored by researchers. Curvelet than a more sparse wavelet transform representation of the image can be more effectively represent the edges and curves content. In 1999, the first generation of Qu Bo transform ridge wavelet transform theory is constructed on the basis of its implementation process need to go through a series of smooth, segmentation, normalization and other operations to implement complex, high redundancy. 2002, the second generation curvelet transform that quickly transform Bo (Fast Discrete Curvelet Transform, FDCT) theory produce, FDCT inherited Curvelet first generation multi-directional and anisotropic characteristics, but the implementation process than the first generation Qu Bo transform simple, fast, low redundancy. Qu Bo has been transformed in recent years, denoising, integration, enhancement, watermarks and other fields are widely used, this paper focuses on the robustness curvelet domain image watermarking algorithm is studied, the main work is as follows: (a) describes the image Digital watermarking technology research background, significance and research status, describes the emergence and development of Qu Bo transform the background. Further introduced the concept of digital watermarking technology, the basic framework, characteristics, classification and application, as well as typical image digital watermarking technology, citing image watermarking system evaluation criteria. (2) for multi-scale geometric analysis theory are briefly analyzed. Focuses on the second generation curvelet transform theory and implementation methods, on this basis, using the examples of analysis of the characteristics of Qu Bo transform summarized Bo transform applied to image digital watermarking technology has the advantages and need to involve key technologies. (3) proposed a novel fast curvelet transform based multi-resolution image watermarking algorithm, the binary watermark image curvelet transform, and then embedded into the same image resolution curvelet coefficients, the experimental results show that the algorithm is simple and feasible, with good invisibility, and the JPEG compression, noise, filtering, cropping, rotating attack with a good robustness. (4) proposed a similar quantitative Bo transform based robust image watermarking algorithm. First, the use of rapid Bo transform the original carrier image multi-resolution decomposition, and treat the embedded watermark image on Arnold; Then, according to human visual characteristics and Qu Bo coefficient distribution characteristics of the watermark information is embedded into the original image in high frequency coefficients. Experimental results show that the algorithm has good invisibility and security, the noise, cut, filtering, JPEG compression, a good robustness to attacks.
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