Reversible Watermarking Mechanisms - a New Paradigm in Image Security

This paper, discuss the features and concepts pertaining to the three popular visible reversible watermarking algorithms and analyze them to evaluate with metrics such as MSE and PSNR values based on implementation i.e. a) Wavelet based watermarking technique b) Tian's difference expansion technique c) LSB-prediction error expansion technique. It is recommended to adopt new reversible data-embedding technique called Least Significant Bit prediction-error expansion which exploits the correlation inherent in the neighborhood of a pixel and provides an effective method for data embedding than the difference-expansion wavelet based schemes. Reversibility aspect ensures image verification, security , lossless embedding and also extraction of images during the damage of source images itself (i.e., image recovery process).