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This paper provides the first thorough documentation of a high qualitydigitization process applied to an early printed book from the incunabulumperiod (1450-1500). The entire OCR related workflow including preprocessing,layout analysis and text recognition is illustrated in detail using the exampleof 'Der Heiligen Leben', printed in Nuremberg in 1488. For each step therequired time expenditure was recorded. The character recognition yieldedexcellent results both on character (97.57%) and word (92.19%) level.Furthermore, a comparison of a highly automated (LAREX) and a manual (Aletheia)method for layout analysis was performed. By considerably automating thesegmentation the required human effort was reduced significantly from over 100hours to less than six hours, resulting in only a slight drop in OCR accuracy.Realistic estimates for the human effort necessary for full text extractionfrom incunabula can be derived from this study. The printed pages of thecomplete work together with the OCR result is available online ready to beinspected and downloaded.

Case Study of a highly automated Layout Analysis and OCR of an incunabulum: 'Der Heiligen Leben' (1488)