AWGN Watermark in Images and E-Books - Optimal Embedding Strength

One important watermarking algorithms class is based on spread spectrum technique (Cox et al., 1997, 2008; Feng et al., 2005, 2006; Mora-Jimenez & Navia-Vazquez, 2000; Perez-Freire & Perez-Gonzalez, 2009; Ruanaidh & Pun, 1998; Ruanaidh & Csurka, 1999) – embedding by spreading the information about each message bit across several image pixels, or across the whole image. Watermark embedding in such manner is usually performed by adding of some pseudorandom data vector to the image.