A Novel Digital Image Watermarking Scheme for Medical Image

Different types of image watermarking schemes have been proposed over the years to come up with a more robust image watermarking algorithm. This paper presents a novel digital image watermarking scheme for medical image. The proposed improved watermarking scheme for medical image utilizes R, G, and B color channels of the color image. RGB cover image is fist decomposed into R, G, B channels, then Discrete Wavelet Transform (DCT) is applied on R channel, Discrete Cosine Transform (DCT) on G channel and List Significant Bit (LSB) on B channel, Medical image is processed with Arnold Scrambling before being embedded. With combination of conventional and widely used watermarking algorithms such as LSB, DWT and DCT and application of Arnold scrambling technique the new watermarking scheme proves to be more robust as it is evident from the experimental result. In order to measure performance of the proposed scheme Normalized Correlation and Peak Signal to Noise Ratio are chosen.