@inproceedings{vidal-gorene-kindt-2026-patrologia,
    title = "The Patrologia Graeca Corpus: {OCR}, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic {G}reek Editions",
    author = "Vidal-Gor{\`e}ne, Chahan  and
      Kindt, Bastien",
    editor = "Piperidis, Stelios  and
      Bel, N{\'u}ria  and
      van den Heuvel, Henk  and
      Ide, Nancy  and
      Krek, Simon  and
      Toral, Antonio",
    booktitle = "Proceedings of the Fifteenth Language Resources and Evaluation Conference",
    month = may,
    year = "2026",
    address = "Palma de Mallorca, Spain",
    publisher = "ELRA Language Resource Association",
    url = "https://preview.aclanthology.org/test-year-match/2026.lrec-1.517/",
    doi = "10.63317/2gvtaxwvjtc7",
    pages = "6519--6527",
    abstract = "We present the Patrologia Graeca Corpus, the first large-scale open OCR and linguistic resource for nineteenth-century editions of Ancient Greek. The collection covers the remaining undigitized volumes of the Patrologia Graeca (PG), printed in complex bilingual (Greek{--}Latin) layouts and characterized by highly degraded polytonic Greek typography. Through a dedicated pipeline combining YOLO-based layout detection and CRNN-based text recognition, we achieve a character error rate (CER) of 1.05{\%} and a word error rate (WER) of 4.69{\%}, largely outperforming existing OCR systems for polytonic Greek. The resulting corpus contains around six million lemmatized and part-of-speech tagged tokens, aligned with full OCR and layout annotations. Beyond its philological value, this corpus establishes a new benchmark for OCR on noisy polytonic Greek and provides training material for future models, including LLMs."
}