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Best-practices zur Erkennung alter Drucke
Tobias Hodel (Walter Benjamin Kolleg, Digital Humanities)
dhd 2020, Uni Paderborn, 5. März 2020
und Handschriften
Twitter:
@thist_be
2
Fokus auf
Handschriftenerkennung
Transkribus als Virtuelle
Research Infrastruktur (VRE)
Erfahrung mit large-scale
Projekten
Project READ
Recognition and Enrichmend of Archival
Documents
3
1) «perfekter» text
2) Identifikation von Textteilen
(«Textregionen»)
3) Suche innerhalb eines Text
(-korpus)
Transkribus (als Beispiel)
Best-practices: Ziel der Texterkennung
4
Welcher «Text»?
5
1) «perfekter» Text
Ziel: Hohe Erkenngenauigkeit
6
5'000 Wörter, 1'000 Zeilen:
Validierungsseiten: 7% CER
Texterkennung:
Karolingische Minuskel
7
48'000 Wörter, 6'450 Zeilen:
Validierungsseiten: 2,5% CER
Texterkennung:
Frühneuzeitliche Briefe
8
77'000 Wörter, 3'500 Zeilen:
Validierungsseiten: 4,8% CER
Texterkennung:
Mittelalterliche Urkunden
9
148'000 Wörter, 31'000 Zeilen:
2,5% CER
Texterkennung:
Protokolle aus dem 19. Jh.
10
- Iterativer Ansatz (Erstellung
von Trainingsmaterial)
- Zeitintensiv: Transkription
einer Hand
- Hilfreich: «base model»
Best case Handschrift:
2-3% CER
1) «Perfekter» text
Goal: Hohe Erkenngenauigkeit
Best case Druck: 0.5% CER
11
2) Identifikation von Textteilen
Ziel: Textregionen finden
12
Visual Feature Recognition
13
Visual Feature Recognition
14
- Fokus auf Annotation
- Zeitintensiv: Annotation der
Regionen + Korrektur der
Transkription
Best case Handschrift: 95%
korrekt identifizierter Regionen
2) Identifikation von Textteilen
Ziel: Textregionen finden
- P2Pala: in Transkribus (UPVLC)
- dhSegment (EPFL)
15
3) Suche innerhalb eines Textes
Ziel: Hoher Recall bei der Identifikation
von Fundstellen
16
17
18
19
- Fokus auf die Identifikation
eines passenden Models
- Zeitintensiv: Durchsicht der
Treffer
Best case: Eigenes Modell ist
nicht notwendig
3) Suche innerhalb eines Textes
Ziel: Hoher Recall bei der Identifikation
von Fundstellen
20
Vorgehensweisen
21
HTR-Modelle sind zentral für
Resultat.
Definition von Trainings- (90%)
und Validierungsset (10%).
Beurteilung von Modellen
Interpretation von Trainingskurven
22
Interpretation von Trainingskurven
Trainings- und Validierungskurve divergiert
23
Interpretation von Trainingskurven
Kurven nähern sich bis Ende einem tieferen
Wert: Austrainieren
24
Interpretation von Trainingskurven
Austrainiertes/optimales Netz
25
Weitere Informationen: read.transkribus.eu
Vielen Dank

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Best-practices zur Erkennung alter Drucke und Handschriften – Die Nutzung von Transkribus large- und small-scale