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    <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.</abstract>
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%0 Conference Proceedings
%T The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions
%A Vidal-Gorène, Chahan
%A Kindt, Bastien
%Y Piperidis, Stelios
%Y Bel, Núria
%Y van den Heuvel, Henk
%Y Ide, Nancy
%Y Krek, Simon
%Y Toral, Antonio
%S Proceedings of the Fifteenth Language Resources and Evaluation Conference
%D 2026
%8 May
%I ELRA Language Resource Association
%C Palma de Mallorca, Spain
%F vidal-gorene-kindt-2026-patrologia
%X 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.
%R 10.63317/2gvtaxwvjtc7
%U https://aclanthology.org/2026.lrec-1.517/
%U https://doi.org/10.63317/2gvtaxwvjtc7
%P 6519-6527

Markdown (Informal)

[The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions](https://aclanthology.org/2026.lrec-1.517/) (Vidal-Gorène & Kindt, LREC 2026)

• The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions (Vidal-Gorène & Kindt, LREC 2026)

ACL

• Chahan Vidal-Gorène and Bastien Kindt. 2026. The Patrologia Graeca Corpus: OCR, Annotation, and Open Release of Noisy Nineteenth-Century Polytonic Greek Editions. In Proceedings of the Fifteenth Language Resources and Evaluation Conference, pages 6519–6527, Palma de Mallorca, Spain. ELRA Language Resource Association.