A Robust Source Coding Watermark Technique Based on Magnitude DFT Decomposition

Image watermarking is considered a powerful tool forCopyright protection, Content authentication, Fingerprintingand for protecting intellectual property. We present in thispaper a watermarking algorithm based on block wise changingmagnitude of DFT domain. This algorithm can be used as anapplication for copyright protection. To provide multi-levelsecurities we have first used best self-synchronizing T-codes toencode the watermark. The encoded watermark is thenembedded into the cover image using a stego-key. We haveanalyzed our algorithm against noise such as Salt and Pepper,Gaussian and Speckle.