Research On Digital Watermark Algorithms Of Audio Content's Protection

Recently, with the rapid development of digital techniques, multimedia products such as image, video, audio, have been popularized and applied increasingly and widely, the efficiency and correction of communication have been improved clearly. But the side effect with it is that, some persons and organizations can easily copy, edit and transmit the content without the permission of the copyright ownership. So, how to take measures to enable copyright protection and information safety in the network, has become a problem that should be solved immediately. Digital watermarking technique is the most effective method to solve copyright ownership. But the current watermark algorithms applied widely are related with image and video. With the popularity of the new compression model mp3, more importance must be put on the copyright of audio. This dissertation selects two-dimension binary image as watermark information, and selects audio as embedding object, and embed the watermark in the coefficient of the DFT domain, the DCT domain, the DWT domain. The main research work and contributions of the dissertation are as follows:(1) This dissertation reviews the relative issues and current research status of fragile digital watermark.(2) This paper introduces some quantification methods for fragile digital watermark.(3) In the discrete cosine domain, the watermark is embedded by quantifying the coefficient of the DCT domain and watermark can be extracted without the original audio. It improves the security of fragile watermark applying Arnold transform for watermark.(4) In the discrete wavelet transform domain, the watermark information is embedded by quantifying the coefficient of the transform domain andthe watermark can be extracted without the original audio. The experimental results indicate that the performance of the watermark algorithm is great. Multipurpose watermark that robust watermark and fragile watermark are embedded by mean quantification in the DWT domain at the same time can realize the protection of copyright and content.(5) The fragile watermark algorithm can be studied by combining the discrete wavelet transform with the discrete cosine transform.