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97 lines
4.9 KiB
Markdown
97 lines
4.9 KiB
Markdown
# Eynollah
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> Document Layout Analysis (segmentation) using pre-trained models and heuristics
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[](https://pypi.org/project/eynollah/)
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[](https://circleci.com/gh/qurator-spk/eynollah)
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[](https://github.com/qurator-spk/eynollah/actions/workflows/test-eynollah.yml)
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[](https://opensource.org/license/apache-2-0/)
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## Features
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* Support for up to 10 segmentation classes:
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* background, [page border](https://ocr-d.de/en/gt-guidelines/trans/lyRand.html), [text region](https://ocr-d.de/en/gt-guidelines/trans/lytextregion.html#textregionen__textregion_), [text line](https://ocr-d.de/en/gt-guidelines/pagexml/pagecontent_xsd_Complex_Type_pc_TextLineType.html), [header](https://ocr-d.de/en/gt-guidelines/trans/lyUeberschrift.html), [image](https://ocr-d.de/en/gt-guidelines/trans/lyBildbereiche.html), [separator](https://ocr-d.de/en/gt-guidelines/trans/lySeparatoren.html), [marginalia](https://ocr-d.de/en/gt-guidelines/trans/lyMarginalie.html), [initial](https://ocr-d.de/en/gt-guidelines/trans/lyInitiale.html), [table](https://ocr-d.de/en/gt-guidelines/trans/lyTabellen.html)
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* Support for various image optimization operations:
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* cropping (border detection), binarization, deskewing, dewarping, scaling, enhancing, resizing
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* Text line segmentation to bounding boxes or polygons (contours) including for curved lines and vertical text
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* Detection of reading order
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* Output in [PAGE-XML](https://github.com/PRImA-Research-Lab/PAGE-XML)
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* [OCR-D](https://github.com/qurator-spk/eynollah#use-as-ocr-d-processor) interface
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## Installation
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Python versions `3.7-3.10` with Tensorflow `>=2.4` are currently supported.
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For (limited) GPU support the [matching](https://www.tensorflow.org/install/source#gpu) CUDA toolkit `>=10.1` needs to be installed.
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You can either install via
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```
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pip install eynollah
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```
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or clone the repository, enter it and install (editable) with
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```
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git clone git@github.com:qurator-spk/eynollah.git
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cd eynollah; pip install -e .
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```
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Alternatively, you can run `make install` or `make install-dev` for editable installation.
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## Models
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Pre-trained models can be downloaded from [qurator-data.de](https://qurator-data.de/eynollah/).
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In case you want to train your own model to use with Eynollah, have a look at [sbb_pixelwise_segmentation](https://github.com/qurator-spk/sbb_pixelwise_segmentation).
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## Usage
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The command-line interface can be called like this:
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```sh
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eynollah \
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-i <image file> \
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-o <output directory> \
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-m <path to directory containing model files> \
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[OPTIONS]
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```
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The following options can be used to further configure the processing:
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| option | description |
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|----------|:-------------|
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| `-fl` | full layout analysis including all steps and segmentation classes |
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| `-light` | lighter and faster but simpler method for main region detection and deskewing |
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| `-tab` | apply table detection |
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| `-ae` | apply enhancement (the resulting image is saved to the output directory) |
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| `-as` | apply scaling |
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| `-cl` | apply countour detection for curved text lines instead of bounding boxes |
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| `-ib` | apply binarization (the resulting image is saved to the output directory) |
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| `-ep` | enable plotting (MUST always be used with `-sl`, `-sd`, `-sa`, `-si` or `-ae`) |
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| `-ho` | ignore headers for reading order dectection |
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| `-di <directory>` | process all images in a directory in batch mode |
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| `-si <directory>` | save image regions detected to this directory |
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| `-sd <directory>` | save deskewed image to this directory |
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| `-sl <directory>` | save layout prediction as plot to this directory |
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| `-sp <directory>` | save cropped page image to this directory |
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| `-sa <directory>` | save all (plot, enhanced/binary image, layout) to this directory |
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If no option is set, the tool will perform layout detection of main regions (background, text, images, separators and marginals).
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The tool produces better quality output when RGB images are used as input than greyscale or binarized images.
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#### Use as OCR-D processor
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Eynollah ships with a CLI interface to be used as [OCR-D](https://ocr-d.de) processor.
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In this case, the source image file group with (preferably) RGB images should be used as input like this:
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```
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ocrd-eynollah-segment -I OCR-D-IMG -O SEG-LINE -P models
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```
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Any image referenced by `@imageFilename` in PAGE-XML is passed on directly to Eynollah as a processor, so that e.g.
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```
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ocrd-eynollah-segment -I OCR-D-IMG-BIN -O SEG-LINE -P models
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```
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uses the original (RGB) image despite any binarization that may have occured in previous OCR-D processing steps
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