Lossless Watermarking for Image Authentication

Data integrity and source origin authentication are essential topics for real-time multimedia systems. But the traditional methods are not very applicable to overcome the distortion introduced in multimedia data transportation. In this paper few security schemes are proposed, which rely on authentication rather than on encryption methods. The highly asymmetric architectures found in ubiquitous computing applications are exploited to provide a protection of the transmitted multimedia data by means of well known digital watermarking techniques. The advocatedapproach exemplifies the basic concept of watermarking and presents a vivid picture of various watermarking techniques. The various watermarking techniques are compared by their Peak Signal to Noise Ratio (PSNR) and provides a report of the highest PSNR in proposed Dual tree DWT(Discrete Wavelet Transform) method.