An illustration of Feature Pyramid Network, where feature maps are indicated by blue outlines and thicker outlines denote semantically stronger features (Lin et al. 2017).

 
  Part of: Younis S, Schmidt M, Weiland C, Dressler S, Seeger B, Hickler T (2020) Detection and annotation of plant organs from digitised herbarium scans using deep learning. Biodiversity Data Journal 8: e57090. https://doi.org/10.3897/BDJ.8.e57090