This repository provides the Ground Truth data for the OCR-D Quiver back end. This data serves as a basis for benchmarking the performance and accuracy of different OCR-D workflows for different types of input data.
This project is maintained by tboenig
The GT data has been labeled. The labeling is based on an ontology defined by the Pattern Recognition and Image Analysis Research Lab (PRImA-Research-Lab) at the University of Salford. This normalized and semantic description of the OCR-GT data can be found in the METS metadata file. The labeling metadata is created for each available page. The following labeling metadata is available for the complete collection.
Here you will find a description and explanation of the labeling metadata.
Description: In computer vision, document layout analysis is the process of identifying and categorizing the regions of interest in the scanned image of a text document. A reading system requires the segmentation of text zones from non-textual ones and the arrangement in their correct reading order. Examples: Page layout analysis (segmentation into regions, classification into text, graphic, table etc.) Related: "OCR": Often used as a synonym for layout analysis and text recognition, but strictly only the text recognition component.
Description:
Description: Translation of any kind of depicted symbols to machine readable format Examples: OCR Mathematical equation recognition Related: Text processing (separate category) Table recognition Map reading
Description: Part of preceeding or succeeding object included (e.g. other page)
Description: Visible page curl (e.g. book scanning)
Description: Perspective distortions (e.g. due to camera-based acquisition)
Description: Ink from facing page was transferred to this page
Description: Annotations regarding the content
Description: E.g. XML
Description: Corpus: a collection of written texts, especially the entire works of a particular author or a body of writing on a particular subject. Examples: A text corpus, An image database
Description: Description coming soon.
Description: Description coming soon.
Description: Description coming soon.
Description: Description coming soon.
Description: Titles repeated each page
Description: Drap capitals (large capitals at beginning of paragraph)
Description: More than one font size used
Description: More than one typeface used
Description: Antiqua font (more modern)
Description: Blackletter, gothic, Fraktur
Description: More than one language used
Description: Description coming soon.
Description: Description coming soon.
Description: Region, zone, block
Description: Description coming soon.
Description: Word or partial word, if separated by line break, for example
Description: Description coming soon.
You can download the complete data here. They contain a zip file in which the components of the collection are also in zip files. Metadata for the complete collection and the components are in METS format.
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| TextLine | Page | TxtRegion | GraphRegion | SepRegion | MusicRegion | NoiseRegion |
|---|---|---|---|---|---|---|
| 215 | 8 | 63 | 4 | 11 | 4 | 2 |