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+# Preprocessing
+
+The preprocessing pipeline that is developed at the 
+[Berlin State Library](http://staatsbibliothek-berlin.de/) 
+comprises the following steps:
+
+### Layout Analysis & Textline Extraction
+
+Layout Analysis & Textline Extraction @[sbb_textline_detector](https://github.com/qurator-spk/sbb_textline_detector)
+
+``INPUT ``: image file
+
+``OUTPUT``: [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML) file with bounding boxes for regions and text lines  
+
+### OCR & Word Segmentation
+
+OCR is based on [OCR-D](https://github.com/OCR-D)'s [ocrd_tesserocr](https://github.com/OCR-D/ocrd_tesserocr) which requires [Tesseract](https://github.com/tesseract-ocr/tesseract) **>= 4.1.0**. The [GT4HistOCR_2000000](https://ub-backup.bib.uni-mannheim.de/~stweil/ocrd-train/data/GT4HistOCR_2000000.traineddata) model, which is [trained](https://github.com/tesseract-ocr/tesstrain/wiki/GT4HistOCR) on the [GT4HistOCR](https://zenodo.org/record/1344132) corpus, is used. Further details are available in the [paper](https://arxiv.org/abs/1809.05501).
+
+``INPUT ``: [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML) file with bounding boxes for regions and text lines 
+
+``OUTPUT``: [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML) file with bounding boxes for words and the contained text
+
+### TSV Transformation
+
+A simple [Python tool](https://github.com/qurator-spk/neath/tree/master/tools) is used for the [transformation](https://github.com/qurator-spk/neath/tree/master/tools) of [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML) to [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format).
+
+``INPUT ``: [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML) file with bounding boxes for words and the contained text 
+
+``OUTPUT``: [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format) file in the desired format for [neath](https://github.com/qurator-spk/neath)
+
+### Tokenization
+
+For tokenization, [SoMaJo](https://github.com/tsproisl/SoMaJo) is used.
+
+``INPUT ``: [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format) file in the desired format for [neath](https://github.com/qurator-spk/neath)
+
+``OUTPUT``: [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format) file with tokenization
+
+### Named Entity Recognition
+
+For Named Entity Recognition, a [BERT-Base](https://github.com/google-research/bert) model was trained for noisy OCR texts with historical spelling variation. [sbb_ner](https://github.com/qurator-spk/sbb_ner) is using a combination of unsupervised training on a large (~2.3m pages) [corpus of German OCR](https://zenodo.org/record/3257041) in combination with supervised training on a small (47k tokens) [annotated corpus](https://github.com/EuropeanaNewspapers/ner-corpora/tree/master/enp_DE.sbb.bio). Further details are available in the [paper](https://corpora.linguistik.uni-erlangen.de/data/konvens/proceedings/papers/KONVENS2019_paper_4.pdf).
+
+``INPUT ``: [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format) file obtained after [Tokenization](https://github.com/qurator-spk/neath/blob/master/docs/Preprocessing.md#tokenization) and postprocessing
+
+``OUTPUT``: [TSV](https://github.com/qurator-spk/neath/blob/master/docs/User_Guide.md#data-format) file with automatically recognized named entities added