Automatic UAV-based counting of seedlings in sugar-beet field and extension to maize and strawberry. - Abel Barreto; Philipp Lottes; Facundo Ramón Ispizua Yamati; Stephen Baumgarten; Nina Anastasia Wolf; Cyrill Stachniss; Anne-Katrin Mahlein; Stefan Paulus (Comput. Electron. Agric., 2021)