Datensatz

Zusammenfassung

CorDeep is a machine-learning based web application to extract visual elements from historical sources and to classify pages that contain numerical and alphanumerical tables. It locates and classifies visual elements into the following categories: “Content Illustrations,” “Initials,” “Decorations,” and “Printers's Marks”. CorDeep is trained on the Sphaera corpus, which is a collection of 359 early modern treatises containing about 78,000 pages, 30,000 visual elements, and 10,000 pages containing tables. The collection is constituted by early modern textbooks on geocentric cosmology (https://sphaera.mpiwg-berlin.mpg.de). The visual elements were manually annotated with bounding boxes and semantic labels whereas the pages with tables were identified semiautomatically by an incrementally improved model supervised by a human expert. CorDeep reaches an average precision of up to 98% concerning the detection of visual elements and an accuracy of 94% concerning the classification of pages containing tables. These values might change depending on the style, content, and quality of inputted images.