The Research Of Multiple Watermarking Based Of Wavelet Packet Transform In Digital Image

With the development of digital and network, the image digital watermarking technology becomes a new technology in order to protect image copyright. It's an important branch of information hiding and digital watermarking technology. This paper discusses the theory of digital image watermarking in depth.A lot of papers research of single digital image watermarking technology, but this paper focuses of multiple image watermarking technology. We can reference single digital watermarking technology which has mature theory when research multiple digital image technology.Firstly this paper explains the information hiding and digital watermarking technology. Secondly, it proposes a dual digital image watermarking algorithm based of wavelet packet transform. The algorithm embedded dual watermark using complementary approach in wavelet packet modulation field. The first watermarking is semi-fragile watermarking, the other is robust watermarking. It selects the area of wavelet packet, the main reasons:1) wavelet packet decomposition was detail divided, but wavelet transform don't divide the high-frequent domain. So it increase the range of options embedded watermarking; 2) wavelet packet transform is adaptive. According to the optimal entropy, choose the embedding field. In the Matlab simulation environment, we can see this watermarking algorithm is feasible and robustness, but also it can improve the embedding capacity. Finally, it proposes a multiple digital image watermark embedding algorithm based of wavelet packet.