On Duplicating of the Elements Representing the Image

The aim of this work is to consider the digital image representation and to find which of their items can be replicated for watermarking. We introduce two schemes for spatial and frequency domain watermarking. We discuss the errors that arise from the round data when a watermarked image is stored in a lossless graphical format for sending to user. The results obtained are illustrated with practical examples of digital watermarking sheet.