ROBUST AND SECURE IMAGE WATERMARKING USING DWT-SVD-PCA WITH RANDOM KEY ENCRYPTION

A watermark is a form of image or text that is impressed onto the paper that provides evidence of its authenticity. Although various watermarking techniques have been developed studied in literature and it's a valuable tool for copyright protection, information hiding and data integrity. Watermarking may be done in spatial domain or transform domain such as DCT or wavelet. We choose to insert the mark in DWT domain because this is domain still used by many algorithms and have advantages over DCT standard. We use DES algorithm to encrypt the watermark image and transform ciphers are used to transform the text watermark. This method is useful to achieve certain level of quality. The performance of our proposed system is evaluating by calculating PSNR and MSE values of original and watermark image. The results prove that the algorithm is robust enough to handle the various types of attacks. Our system can preserve the appropriate level of quality. By embedding the watermark into DWT is far better than embedding the watermark in DCT domain. The Proposed research aims to develop an improved Watermarking approach which is based on DWT and SVD along with encryption. Of color images with higher imperceptibility/quality, large capacity/payload and better in robustness/resistance to attacks. Images as well as text messages can be hide within the images using sequential and random methods. It will incorporate cryptography to achieve high security and random pixel embedding to attain high immunity to attacks. Performance of the same had been analyzed by calculating normalized correlation (NC), peak signal to noise ratio(PSNR) men square error (MSE) for various attacks. Moreover the performance of had been compared with Tapas etal Algorithm, DSAWM Algorithm. Here we have tested this system on 50 different images. Maximum observed values of the proposed system for PSNR is 68.41 without attaks and 58.94 with attacks. Minimun MSE values of the existing test cases comes out to be 0.0018992. whereas value of NC is evaluated as 0.9984. These values are far better than that of existing systems. In the proposed system a new technique is developed to watermark the images after encryption process. In addition to DES algorithm we use DWT and SVD to apply the watermark. Proposed system is also tested on various types of attacks on the watermarked images to check the robustness of the system