Badrol, M.A. and Ramli, M.F. (2024) “The Comparative Study Between the Grid Size of Image Frame Using Image Subtraction and Pixel Expansion Cue for Free Obstacle Region Detection”, Progress in Aerospace and Aviation Technology, 4(1), pp. 57–71. Available at: https://penerbit.uthm.edu.my/ojs/index.php/paat/article/view/16825 (Accessed: 11 March 2026).