Enlargement of Balanced-Incomplete-Block-Designs-Based Watermarks

Large number of watermarks is crucial for some real watermarking applications, such as transaction tracking. The purpose of this paper is to enlarge the structured watermarks based on balanced incomplete block designs (BIBD). An approach is proposed to generate new structured watermarks by combining existing BIBD-based watermarks. The corresponding recognition rules for the new set of watermarks are designed based on the structure information contained. Experimental results show the properties of the proposed watermarks based on true positive and false positive rates under Gaussian noise.