General schemes for blind watermark

Digital watermark is a very active research area that has received a considerable amount of attention in many multimedia applications. For most watermark applications, it is often desired to retrieve the embedded information without reference to the host data; this is known as blind watermark. Some of previous blind watermark schemes either suffer significantly from host data interference or require expensive cost of storage. In this paper, we attempt to resolve the question. Here, we present three general schemes for blind watermark. The first two based on lattice principle and property of periodic function, respectively. The host data interference is eliminated by only a little of cost of storage in the third scheme. They have considerable advantages over previous proposed schemes.