Multiple Watermarking Based on the Principle of Orthogonality

Abstract

The idea of orthogonal space is introduced into multiple watermarking, and a new type of multiple watermarking method based on the principle of orthogonality is summarized. Two different subclasses are introduced, while in one subclass, the watermarks are made to be orthogonal to each other before embedded, and in the other subclass, the watermarks are embedded into the cover vectors which are orthogonal to each other and extracted from the original cover. The performances of the two subclasses are compared and analyzed, and the analytic results show that the multiple watermarking method based on the principle of orthogonality has very good performances, such as the capacity of singular watermark and the number of watermarks that can be embedded, and what's more, it can avoid the interference of one watermark signal with another.