Radha, P., and T. Shanthi. “Improving the Performance of Face Recognition Technique Using Brightness Preserving and Contrast Limited Bi-Histogram Equalization”. International Journal of Engineering and Technology 7, no. 4.25 (November 30, 2018): 278–282. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/26938.