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https://github.com/mauvilsa/tesseract-recognize

Tool that does layout analysis and/or text recognition using tesseract and outputs the result in Page XML format
https://github.com/mauvilsa/tesseract-recognize

cli docker-image document-recognition ocr optical-character-recognition pagexml tesseract text-detection

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Tool that does layout analysis and/or text recognition using tesseract and outputs the result in Page XML format

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# NAME



tesseract-recognize - A tool that does layout analysis and/or text recognition using tesseract and outputs the result in Page XML format.



[![Docker Automated build](https://img.shields.io/docker/build/mauvilsa/tesseract-recognize.svg)]()



# Requirements (Ubuntu 18.04 & 20.04 & 22.04)



## Build



- make

- cmake

- g++

- libtesseract-dev

- libgs-dev

- libxslt1-dev



## Runtime



- tesseract-ocr

- ghostscript

- libxslt1.1



# Installation and usage



To compile from source follow the instructions here. If you only want the tool

it might be simpler to use docker as explained in the next section.



    git clone --recursive https://github.com/mauvilsa/tesseract-recognize

    mkdir tesseract-recognize/build

    cd tesseract-recognize/build

    cmake -DCMAKE_INSTALL_PREFIX:PATH=$HOME ..

    make install

    

    tesseract-recognize --help

    tesseract-recognize IMAGE1 IMAGE2 -o OUTPUT.xml

    tesseract-recognize INPUT.xml -o OUTPUT.xml



# Installation and usage (docker)



The latest docker images are based on Ubuntu 22.04 and use the version of

tesseract from the default package repositories (see the respective [docker hub

page](https://hub.docker.com/r/mauvilsa/tesseract-recognize/)).



To install first pull the docker image of your choosing, using a command such

as:



    TAG="SELECTED_TAG_HERE"

    docker pull mauvilsa/tesseract-recognize:$TAG



The basic docker image only includes language files for recognition of English,

so for additional languages you need to provide to the docker container the

corresponding tessdata files. There is also an additional docker image that can

be used to create a volume that includes all languages from the tesseract-ocr-*

ubuntu packages. To create this volume run the following:



    docker pull mauvilsa/tesseract-recognize-langs:ubuntu22.04-pkg

    docker run \

      --rm \

      --mount source=tesseract-ocr-tessdata,destination=/usr/share/tesseract-ocr/4.00/tessdata \

      -it mauvilsa/tesseract-recognize-langs:ubuntu22.04-pkg



Then there are two possible ways of using the tesseract-recognize docker image,

through a command line interface or through a REST API, as explained in the next

two sections.



## Command line interface



First download the

[https://github.com/omni-us/docker-command-line-interface](docker-cli), put it

in some directory in your path and make it executable, for example:



    wget -O $HOME/.local/bin https://raw.githubusercontent.com/omni-us/docker-command-line-interface/master/docker-cli

    chmod +x $HOME/.local/bin/docker-cli



As an additional step, you could look at `docker-cli --help` and read about how

to configure bash completion.



After installing docker-cli, the tesseract-recognize tool can be used like any

other command, i.e.



    docker-cli \

      --ipc=host \

      -- mauvilsa/tesseract-recognize:$TAG \

      tesseract-recognize IMAGE -o OUTPUT.xml



To recognize other languages using the tessdata volume mentioned previously can

be done as follows



    docker-cli \

      --ipc=host \

      --mount source=tesseract-ocr-tessdata,destination=/usr/share/tesseract-ocr/4.00/tessdata \

      -- mauvilsa/tesseract-recognize:$TAG \

      tesseract-recognize IMAGE -o OUTPUT.xml



For convenience you could setup an alias, i.e.



    alias tesseract-recognize-docker="docker-cli --ipc=host --mount source=tesseract-ocr-tessdata,destination=/usr/share/tesseract-ocr/4.00/tessdata -- mauvilsa/tesseract-recognize:$TAG tesseract-recognize"

    tesseract-recognize-docker --help



## API interface



The API interface uses a python flask sever that can be accessed through port

5000 inside the docker container. For example the server could be started as:



    docker run --rm -t -p 5000:5000 mauvilsa/tesseract-recognize:$TAG 



The API exposes the following endpoints:



Method | Endpoint                          | Description                      | Parameters (form fields)

------ | --------------------------------- | -------------------------------- | ------------------------

GET    | /tesseract-recognize/version      | Returns tool version information | -

GET    | /tesseract-recognize/help         | Returns tool help                | -

GET    | /tesseract-recognize/swagger.json | The swagger json                 | -

POST   | /tesseract-recognize/process      | Recognize given images or xml    | **images (array, required):** Image files with names as in page xml. **pagexml (optional):** Page xml file to recognize. **options (optional):** Array of strings with options for the tesseract-recognize tool.



For illustration purposes the curl command can be used. Processing an input

image with a non-default layout level would be using a POST such as



    curl -o output.xml -F [email protected] -F options='["--layout", "word"]' http://localhost:5000/tesseract-recognize/process



To process a page xml file, both the xml and the respective images should be

included in the request, that is for example



    curl -o output.xml -F [email protected] -F [email protected] -F pagexml=input.xml http://localhost:5000/tesseract-recognize/process



The API is implemented using Flask-RESTPlus which allows that once the server is

started, you can use a browser to get a more detailed view of the exposed

endpoints by going to http://localhost:5000/tesseract-recognize/swagger.



# Viewing results



The results can be viewed/edited using the Page XML editor available at

https://github.com/mauvilsa/nw-page-editor or using other tools that support

this format such as http://www.primaresearch.org/tools and

https://transkribus.eu/Transkribus/ .



# Contributing



If you intend to contribute, before any commits be sure to first execute

githook-pre-commit to setup (symlink) the pre-commit hook. This hook takes care

of automatically updating the tool version.



# Copyright



The MIT License (MIT)



Copyright (c) 2015-present, Mauricio Villegas