Segmentation of blood vessels in colposcopic images using polarized light and Sauvola thresholding - Phan Ngoc Khuong, Cat; Tran Van, Tien; Nguyen Ngoc, Quynh; Ly Anh, Tu; Tu Tuyet, Dung; Vu Quoc, Anh (VNUHCM Journal of Engineering and Technology, 2020)