Research and realization of digital watermarking for image and acoustic wave

The wavelet SVD (singular value decomposition) method of digital watermark was introduced. This method can protect the copyright of multimedia information. The digital watermark technique is based on information hiding. Image and audio file formats were analyzed. The experimental results of watermark embedding and detecting on image and audio file were given. The relation between the coefficients in the wavelet SVD method and the generation of watermark was described. How to select the proper watermark was elucidated.