Comparison of digital watermarking techniques

Digital watermarking is one of the effective methods for preventing illegal copyright of digital media. It is the process of hiding digital data in any form of multimedia data such as image, audio, video, etc. This paper performs a comparative analysis of different image watermarking techniques. The watermarking techniques based on DCT and SVD, DWT and SVD and a combination of DCT and DWT is implemented. The DCT+DWT method is also experimented by dividing the cover image and watermark into four equal parts and then performing the embedding technique. Different attacks are applied on the watermarked image in order to analyze the robustness of each algorithm.