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https://github.com/UB-Mannheim/ocr-fileformat
Validate and transform various OCR file formats (hOCR, ALTO, PAGE, FineReader)
https://github.com/UB-Mannheim/ocr-fileformat
alto finereader hocr ocr ocr-d page-xml transformation validation
Last synced: 18 days ago
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Validate and transform various OCR file formats (hOCR, ALTO, PAGE, FineReader)
- Host: GitHub
- URL: https://github.com/UB-Mannheim/ocr-fileformat
- Owner: UB-Mannheim
- License: mit
- Created: 2016-04-08T14:43:58.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2024-08-01T09:42:55.000Z (3 months ago)
- Last Synced: 2024-08-05T01:07:27.980Z (3 months ago)
- Topics: alto, finereader, hocr, ocr, ocr-d, page-xml, transformation, validation
- Language: JavaScript
- Homepage: https://digi.bib.uni-mannheim.de/ocr-fileformat/
- Size: 805 KB
- Stars: 176
- Watchers: 20
- Forks: 23
- Open Issues: 35
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# ocr-fileformat
[](https://app.codacy.com/gh/UB-Mannheim/ocr-fileformat/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
[](https://github.com/UB-Mannheim/ocr-fileformat/actions/workflows/ci.yml)
[](https://github.com/UB-Mannheim/ocr-fileformat/releases)
[](https://hub.docker.com/r/ubma/ocr-fileformat)
Validate and transform between OCR file formats (hOCR, ALTO, PAGE, FineReader)
* [Installation](#installation)
* [Docker](#docker)
* [System-wide](#system-wide)
* [Usage](#usage)
* [CLI](#cli)
* [GUI](#gui)
* [API](#api)
* [Transformation](#transformation)
* [Transformation CLI](#transformation-cli)
* [Transformation GUI](#transformation-gui)
* [Transformation API](#transformation-api)
* [Supported Transformations](#supported-transformations)
* [Validation](#validation)
* [Validation CLI](#validation-cli)
* [Validation GUI](#validation-gui)
* [Validation API](#validation-api)
* [Supported Validation Formats](#supported-validation-formats)
* [License](#license)
## Installation
### Docker
You can run the [command line scripts](#cli) and [web interface](#gui) as a
[Docker container](https://hub.docker.com/r/ubma/ocr-fileformat), you only need
Docker installed.
To start the web interface on [http://localhost:8080](http://localhost:8080):
```sh
docker run --rm -it -p 8080:8080 ubma/ocr-fileformat
```
To run the command line scripts, mount the directory containing your input
files into the container's `/data` directory:
```sh
docker run --rm -it -v "$PWD":/data ubma/ocr-fileformat ocr-transform alto2.0 hocr somefile.alto
```
### System-wide
To install system-wide to `/usr/local`:
```sh
sudo make install
```
To install without `sudo` to your home directory:
```sh
make install PREFIX=$HOME/.local
```
If `$HOME/.local/bin` is not in your `PATH`, add this to your shell startup file (e.g. `~/.bashrc` or `~/.zshrc`):
```
export PATH="$HOME/.local/bin $PATH"
```
The web application has a PHP backed. You can deploy it on any PHP-capable
server by copying the [`web`](./web) folder somewhere below the document root
of your server, e.g. `/var/www/html` for Apache on Debian/Ubuntu:
```
sudo -u www-data cp -r web /var/www/html/ocr-fileformat
```
In this example the GUI would be available under [http://localhost/ocr-fileformat/](http://localhost/ocr-fileformat/).
## Usage
The project offers two functionalities, which can be accessd via a command line
script (CLI), using a web interface (GUI) or in you own tools (API)
### CLI
* [`ocr-transform`](./bin/ocr-transform.sh): Transformation of OCR output between OCR formats
* [`ocr-validate`](./bin/ocr-validate.sh): Validation of OCR output against OCR format schemas
### GUI
The web interface is for testing validation and transformations. You can upload
a file or select an input file by URL.
### API
* [`$PREFIX/share/ocr-fileformat/xslt`](./xslt) - XSLT stylesheets
* [`$PREFIX/share/ocr-fileformat/xsd`](./xsd) - XSD schemas
* [`$PREFIX/share/ocr-fileformat/script/transform`](./script/transform) - Transformation scripts
* [`$PREFIX/share/ocr-fileformat/script/validate`](./script/validate) - Validation scripts
## Transformation
### Transformation CLI
```
Usage: ocr-transform [-dl] [ []] [-- ]
```
For example, you can transform an ALTO XML to a hOCR file with:
```sh
ocr-transform alto hocr sample.xml sample.hocr
```
Or convert from ALTO XML (version 2.1) to hOCR with:
```sh
ocr-transform alto2.1 hocr sample.alto sample.hocr
```
You can also pass arguments directly to the Saxon CLI by passing them after a double dash (`--`). For example, to set the `foo` parameter to `bar`:
```sh
ocr-transform alto hocr sample.xml sample.hocr -- foo=bar
```
Try `ocr-transform -h` to get an overview:
```
Usage:
ocr-transform [OPTIONS] [ []] [-- ]
ocr-transform [OPTIONS] --help-args Show script-args, and exit
ocr-transform [OPTIONS] -h|--help Show this help, and exit
ocr-transform [OPTIONS] -v|--version Show version, and exit
ocr-transform [OPTIONS] -L|--list List available from/to, and exit
Options:
--debug -d Increase debug level by 1, can be repeated
Transformations:
abbyy hocr
abbyy page
alto hocr
alto page
alto text
alto2.0 alto3.0
alto2.0 alto3.1
alto2.0 hocr
alto2.1 alto3.0
alto2.1 alto3.1
alto2.1 hocr
alto4.2 alto2.1
gcv alto
gcv hocr
gcv page
hocr alto
hocr alto2.0
hocr alto2.1
hocr alto3.0
hocr alto4.0
hocr page
hocr tei
hocr text
mybib alto3.0
page alto
page alto_legacy
page hocr
page page2019
page text
tei hocr
textract page
```
### Transformation GUI
Select the `Transform` menu option. Choose a URL, an input and an output
format. Click `Transform`.
### Transformation API
The stylesheets are installed in `$PREFIX/share/ocr-fileformat/xslt` and can be
used directly in your scripts and software. You will need to use an XSLT 2.0
capable stylesheet transformer.
### Supported Transformations
| From ╲ To | hOCR | ALTO | PAGEXML | TEI | Text |
| ---: | --- | --- | --- | --- | --- |
| hOCR | - | ✓ | ✓ | ✓ | ✓ |
| ALTO | ✓ | ✓ | ✓ | - | ✓ |
| PAGEXML | ✓ | ✓ | ✓ | - | ✓ |
| ABBYY FineReader | ✓ | - | ✓ | - | - |
| Google Cloud Vision | ✓ | ✓ | ✓ | - | - |
| Amazon AWS Textract | - | - | ✓ | - | - |
| TEI | ✓ | - | - | - | - |
## Validation
```
Usage:
ocr-validate [OPTIONS] []
ocr-validate [OPTIONS] -h|--help Show this help, and exit
ocr-validate [OPTIONS] -v|--version Show version, and exit
ocr-validate [OPTIONS] -L|--list List available schemas, and exit
Options:
--debug -d Increase debug level by 1, can be repeated
Schemas:
hocr
alto-1-0 alto-1-1 alto-1-2 alto-1-3 alto-1-4 alto-2-0 alto-2-1 alto-2-2-draft alto-3-0 alto-3-1 alto-3-2-draft alto-4-0 alto-4-1 alto-4-2 alto-4-3
abbyy-6-schema-v1 abbyy-8-schema-v2 abbyy-9-schema-v1 abbyy-10-schema-v1
page-2009-03-16 page-2010-01-12 page-2010-03-19 page-2013-07-15 page-2016-07-15 page-2017-07-15 page-2018-07-15 page-2019-07-15
```
### Validation CLI
For example, to validate an XML file against the ALTO 3.1 schema:
```
ocr-validate alto-3-1 myFile.alto
```
### Validation GUI
Select the `Validate` menu option. Choose a URL and an schema. Click `Validate`.
### Validation API
The XSD files are installed under `$PREFIX/share/ocr-fileformat/xsd`
### Supported Validation Formats
| | hOCR | ALTO | PAGEXML | FineReader | Google Cloud Vision | Amazon AWS Textract |
| ---: | --- | --- | --- | --- | --- | --- |
| Validation | ✓ | ✓ | ✓ | ✓ | - | - |
## License
This is free software. You may use it under the terms of the [MIT License](LICENSE).
During the installation process several projects are included (in [`./vendor`](./vendor)). These projects have different licenses:
* [Saxon HE 9.7](http://saxon.sourceforge.net/#F9.7HE), [`MPL`](https://www.mozilla.org/MPL/).
* [ALTOXML schema](https://github.com/altoxml/schema), ["Open Source"](https://github.com/altoxml/schema/issues/37#issuecomment-218730230) for ALTO <= 3.1, [`CC BY SA 4.0`](https://creativecommons.org/licenses/by-sa/4.0/legalcode) since ALTO 4.0
* [PAGE schemas](http://www.primaresearch.org/schema/PAGE/gts/pagecontent/), `?`
* [xsd-validator](https://github.com/kba/xsd-validator) by Adrian Mouat [@amouat](https://github.com/amouat), `Apache 2.0`
* ABBYY FineReader XSD, `?`
* [hOCR-to-ALTO](https://github.com/filak/hOCR-to-ALTO) by Filip Kriz [@filak](https://github.com/filak), [`MIT`](https://github.com/filak/hOCR-to-ALTO/blob/master/LICENSE.txt)
* [hocr-spec](https://github.com/kba/hocr-spec-python) by Konstantin Baierer [@kba](https://github.com/kba), [`MIT`](https://github.com/kba/hocr-spec-python/blob/master/LICENSE)
* [gcv2hocr](https://github.com/dinosauria123/gcv2hocr) by Endo Michiaki, [`CC BY 4.0`](https://creativecommons.org/licenses/by/4.0/legalcode)
* [format-converters](https://github.com/OCR-D/format-converters) by OCR-D, [`Apache 2.0`](https://github.com/OCR-D/format-converters/blob/master/LICENSE)
* [prima-page-converter](https://github.com/PRImA-Research-Lab/prima-page-converter/) by PRImA Research Lab , [`Apache 2.0`](https://github.com/PRImA-Research-Lab/prima-page-converter/blob/master/LICENSE)
* [page-to-alto](https://github.com/kba/page-to-alto/) by Konstantin Baierer @kba, [`Apache 2.0`](https://github.com/kba/page-to-alto/blob/master/LICENSE)
* [textract2page](https://github.com/slub/textract2page/) by Arne Rümmler @rue-a, [`Apache 2.0`](https://github.com/slub/textract2page/blob/master/LICENSE)