Research On Digital Watermaking Based On Transform Domain Algorithm

With the rapid development of Internet, more and more digital products such as: text, images, audio, video, spread rapidly through the Internet. And the Internet's information can easily be copied and modified, so the network infringement intensified. Therefore, there is growing attention to the issue of copyright protected works, so the digital watermarking technology has come into being.Firstly, analysis of digital watermarking technology, historical background and significance of the dynamic digital watermarking research and development status; introduced the basic concept of digital watermarking and framework, the basic characteristics and classification, and the typical digital watermarking algorithm, the final analysis presented the application of digital watermarking.Then, DCT transform theoretical principles of research, described in detail the definition of DCT transform and principle of the DCT transform in digital watermarking. Also introduced pre-processing of digital watermarking technologies, in particular the analysis of Arnold transform introduced, and the order given under different two-dimensional Arnold transformation cycle. By scrambling the watermark transform preprocessing, frequency domain DCT coefficients of the exchange to complete the embedding.Second, the principle of DWT transform theory, described in detail the definition of DWT transform and principle of the DWT transform in digital watermarking. Given based on DWT domain watermarking algorithm, the algorithm using the human visual characteristics, the wavelet decomposition of high-frequency part of the diagonal embedding watermark.Finally, the use of DWT and DCT transforms a combination of the two algorithms to transform the original image information, and using Arnold transform to preprocess the watermark information, and according to human visual characteristics by making full use of the characteristics of DCT and DWT transform the watermark embedded into the original image.