Comparative Study of Hybrid Transform Based Digital Watermarking Technique

in order to conceal certain specific information, a digital watermark is added in a signal. It is typically used to identify ownership or copyright of any signal. There are widely two domains in which digital watermarking is divided: spatial domain and transform domain. Few disadvantages of the spatial domain are that it alters the host image and cannot tolerate lossy compression. Hence transform domain digital watermarking is more popular. There are several method in transform domain like: Discrete Cosine Transform (DCT), Discrete wavelet Transform (DWT) and Singular Value Decomposition (SVD). In order to improve the robustness of digital watermarking, a novel method of DWT-SVD was introduced. This method helps in utilizing the advantages of both methods together. The results show that performance of DWT-SVD is better than performance of DWT and SVD alone. The method along with algorithm and results is discussed in the paper. Future work can be directed in order to reduce the computational complexity of this method.