Nerat, Andrej, Damjan Strnad, Eva Zupančič, and Borut Žalik. “Extended Algorithm to Construct a Quadtree from Freeman Chain Code in Four Directions”. Image Analysis and Stereology 38, no. 3 (December 13, 2019): 227–235. Accessed April 30, 2025. http://233.ablak.arnes.si/ojs/index.php/IAS/article/view/2095.