A Survey Paper on Reversible Image Data Hiding

Reversible data hiding (RDH) has been intensively studied in the community of signal processing. Also referred as invertible or lossless data hiding, RDH is to embed a piece of information into a host signal to generate the marked one, from which the original signal can be exactly recovered after extracting the embedded data. The earlier algorithm enhances the contrast of a host image to improve its visual quality, instead of trying to keep the PSNR value high. The highest two bins in the histogram are selected for data embedding so that histogram equalization can be performed by repeating the process. The original image is completely recoverable; the side information is embedded along with the message bits into the host image.