Mat Saat, Az-Aiman Fariq, and Nur Anida Jumadi. “Development of Watermelon Ripeness Grading System Based on Colour Histogram”. Evolution in Electrical and Electronic Engineering 1, no. 1 (October 11, 2020): 253–259. Accessed April 7, 2026. https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/180.