Computer Science > Computer Vision and Pattern Recognition
arXiv:2603.09470 (cs)
[Submitted on 10 Mar 2026]
Title:The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions
View a PDF of the paper titled The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions, by Chahan Vidal-Gor\`ene (CJM and 2 other authors
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Abstract:We present the Patrologia Graeca Corpus, the first large-scale open OCR and linguistic resource for nineteenthcentury 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.
| Subjects: | Computer Vision and Pattern Recognition (cs.CV) |
| Cite as: | arXiv:2603.09470 [cs.CV] |
| (or arXiv:2603.09470v1 [cs.CV] for this version) | |
| https://doi.org/10.48550/arXiv.2603.09470
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| Journal reference: | Language Resources and Evaluation Conference, May 2026, Palma De Majorque, Spain |
Submission history
From: Chahan Vidal-Gorene [view email] [via CCSD proxy][v1] Tue, 10 Mar 2026 10:21:54 UTC (7,365 KB)
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View a PDF of the paper titled The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions, by Chahan Vidal-Gor\`ene (CJM and 2 other authors
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