In this book, we present a number of example watermarking systems to illustrate and test some of the main points. Discussions of test results provide additional insights and lead to subsequent sections.

Each investigation begins with a preamble. If a new watermarking system is being used, a description of the system is provided. Experimental procedures and results are then described.

The watermark embedders and watermark detectors that make up these systems are given names and are referred to many times throughout the book. The naming convention we use is as follows: All embedder and detector names are written in sans serif font to help set them apart from the other text. Embedder names all start with E_ and are followed by a word or acronym describing one of the main techniques illustrated by an algorithm. Similarly, detector names begin with D_ followed by a word or acronym. For example, the embedder in the first system is named E_BLIND (it is an implementation of blind embedding), and the detector is named D_LC (it is an implementation of linear correlation detection).

Each system used in an investigation consists of an embedder and a detector. In many cases, one or the other of these is shared with several other systems. For example, in Chapter 3, the D_LC detector is paired with the E_BLIND embedder in System 1 and with the E_FIXED_LC embedder in System 2. In subsequent chapters, this same detector appears...