Cheang, Kah Ying, and Siti Hawa Ruslan. “Performance Optimization of Face Detection Algorithm”. Evolution in Electrical and Electronic Engineering 1, no. 1 (October 12, 2020): 145–152. Accessed July 1, 2022. https://publisher.uthm.edu.my/periodicals/index.php/eeee/article/view/80.