Khalifa, Farhad M., and Mohammed G. Saeed. “Image Watermarking Using All Phase Discrete Cosine Biorthogonal Transform in Selected Pixel Blocks”. Polytechnic Journal 10, no. 1 (June 30, 2020): 68-73. Accessed May 4, 2024. https://journals.epu.edu.iq/index.php/polytechnic/article/view/134.