ABSTRACT
This chapter provides an important technique from the compressed-feature-based class. It describes a family of reversible watermarking algorithms that has very high capacity and causes low distortion in the image. Watermarking valuable and sensitive images such as artwork and military and medical images presents a major challenge to most watermarking algorithms. The chapter introduces the Generalized Reversible Integer Transform (GRIT), which is the base of a family of high-capacity, reversible watermarking algorithms and the difference expansion and the least-significant-bit embedding in the GRIT domain. J. Tian introduced a high-capacity, reversible watermarking technique that uses a simple integer wavelet transform. The difference between the original image and the embedded image increases with every application of the algorithm. Test results of the spatial dyad-based, triplet-based, and quad-based algorithms indicate that the amount of data that one can embed into an image depends highly on the nature of the image.
