Image Watermarking using Triple Transform (DCT- DWT-SVD) to Improve Copyright Protection Performance

摘要

One popular security technique used to protect copyright ownership in digital images is image watermarking. Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) are techniques that are widely studied in the development of watermarking methods. The combination of the two transformations successfully proved to be able to survive well from attacks. But the problem that often arises in the methods used in watermarking is contradictory imperceptibility and robustness. Singular Value Decomposition (SVD) can optimize the robustness and imperceptibility aspects. So in this research watermarking technique is proposed with a combination of the DCT-DWT-SVD method with the aim of optimizing robustness and imperceptibility. The stages that differentiate in this study are the DCT process that is carried out before DWT, while the SVD transformation is done last both in the host and watermark images. It was proven from the results of the experiment that the proposed method was able to withstand various attacks as evidenced by robustness measurements using NC and imperceptibility measurements as evidenced by satisfactory PSNR and MSE results.