Digital Image Authentication by DCT and RPM Based Watermarking

Digital watermarking has been proposed as a viable clarification to the necessity of copyright protection and authentication of multimedia system information in a networked environment, since it makes possible to identify the author, owner, distributor or approved client of a document. This paper elaborates quality of discrete cosine transform for image watermarking, DCT based image watermarking technique, classification and analysis of discrete cosine transform primarily based watermarking techniques. Discrete cosine transform and wavelet based mostly image watermarking ways that. It'll be useful for researchers to implement effective image watermarking methodology .the propose algorithmic program to supply information privacy and additional authentication. Watermark embedding into host image. Propose algorithmic program also have good performance in hardiness, reliable and computing complexity. Keywords-Watermarking, Visibility, Security, Robustness, Discrete cosine transform, Reversible data hiding.