Sinaga, Daurat, and Cahaya Jatmoko. “WATERMARKING CITRA GRAYSCALE MENGGUNAKAN DICRETE COSINE TRANSFORM”. Proceeding SENDI_U (July 28, 2021): 468-473. Accessed April 14, 2025. https://www.unisbank.ac.id/ojs/index.php/sendi_u/article/view/8636.