Anam, Syaiful, Zuraidah Fitriah, Nur Shofianah, and Ratno Bagus Edy Wibowo. 2019. “Fundus Image Enhancement Using White Top Hat Operation and Perona-Malik Diffusion Filter”. International Journal of Engineering & Technology 7 (4): 5758-66. https://doi.org/10.14419/ijet.v7i4.18769.