Rahardi, Majid, Afrig Aminuddin, Ferian Fauzi Abdulloh, Nafiatun Sholihah, and Ferda Ernawan. 2025. “Optimizing Imperceptibility and Robustness Using Selective DCT Coefficients for Image Copyright Protection”. Engineering, Technology & Applied Science Research 15 (4). Greece:24825-31. https://doi.org/10.48084/etasr.10241.