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Implemented OCR Functionality

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Ray Smith (lead developer) <theraysmith@gmail.com>
Ahmad Abdulkader
Rika Antonova
Nicholas Beato
Jeff Breidenbach
Samuel Charron
Phil Cheatle
Simon Crouch
David Eger
Sheelagh Huddleston
Dan Johnson
Rajesh Katikam
Thomas Kielbus
Dar-Shyang Lee
Zongyi (Joe) Liu
Robert Moss
Chris Newton
Michael Reimer
Marius Renn
Raquel Romano
Christy Russon
Shobhit Saxena
Mark Seaman
Faisal Shafait
Hiroshi Takenaka
Ranjith Unnikrishnan
Joern Wanke
Ping Ping Xiu
Andrew Ziem
Oscar Zuniga
Community Contributors:
Zdenko Podobný (Maintainer)
Jim Regan (Maintainer)
James R Barlow
Stefan Brechtken
Thomas Breuel
Amit Dovev
Martin Ettl
Shree Devi Kumar
Noah Metzger
Tom Morris
Tobias Müller
Egor Pugin
Robert Sachunsky
Raf Schietekat
Sundar M. Vaidya
Robin Watts
Stefan Weil
Nick White
Alexander Zaitsev

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# Tesseract OCR
[![Coverity Scan Build Status](https://scan.coverity.com/projects/tesseract-ocr/badge.svg)](https://scan.coverity.com/projects/tesseract-ocr)
[![CodeQL](https://github.com/tesseract-ocr/tesseract/workflows/CodeQL/badge.svg)](https://github.com/tesseract-ocr/tesseract/security/code-scanning)
[![OSS-Fuzz](https://img.shields.io/badge/oss--fuzz-fuzzing-brightgreen)](https://issues.oss-fuzz.com/issues?q=is:open%20title:tesseract-ocr)
\
[![GitHub license](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](https://raw.githubusercontent.com/tesseract-ocr/tesseract/main/LICENSE)
[![Downloads](https://img.shields.io/badge/download-all%20releases-brightgreen.svg)](https://github.com/tesseract-ocr/tesseract/releases/)
## Table of Contents
* [Tesseract OCR](#tesseract-ocr)
* [About](#about)
* [Brief history](#brief-history)
* [Installing Tesseract](#installing-tesseract)
* [Running Tesseract](#running-tesseract)
* [For developers](#for-developers)
* [Support](#support)
* [License](#license)
* [Dependencies](#dependencies)
* [Latest Version of README](#latest-version-of-readme)
## About
This package contains an **OCR engine** - `libtesseract` and a **command line program** - `tesseract`.
Tesseract 4 adds a new neural net (LSTM) based [OCR engine](https://en.wikipedia.org/wiki/Optical_character_recognition) which is focused on line recognition, but also still supports the legacy Tesseract OCR engine of Tesseract 3 which works by recognizing character patterns. Compatibility with Tesseract 3 is enabled by using the Legacy OCR Engine mode (--oem 0).
It also needs [traineddata](https://tesseract-ocr.github.io/tessdoc/Data-Files.html) files which support the legacy engine, for example those from the [tessdata](https://github.com/tesseract-ocr/tessdata) repository.
Stefan Weil is the current lead developer. Ray Smith was the lead developer until 2018. The maintainer is Zdenko Podobny. For a list of contributors see [AUTHORS](https://github.com/tesseract-ocr/tesseract/blob/main/AUTHORS)
and GitHub's log of [contributors](https://github.com/tesseract-ocr/tesseract/graphs/contributors).
Tesseract has **unicode (UTF-8) support**, and can **recognize [more than 100 languages](https://tesseract-ocr.github.io/tessdoc/Data-Files-in-different-versions.html)** "out of the box".
Tesseract supports **[various image formats](https://tesseract-ocr.github.io/tessdoc/InputFormats)** including PNG, JPEG and TIFF.
Tesseract supports **various output formats**: plain text, hOCR (HTML), PDF, invisible-text-only PDF, TSV, ALTO and PAGE.
You should note that in many cases, in order to get better OCR results, you'll need to **[improve the quality](https://tesseract-ocr.github.io/tessdoc/ImproveQuality.html) of the image** you are giving Tesseract.
This project **does not include a GUI application**. If you need one, please see the [3rdParty](https://tesseract-ocr.github.io/tessdoc/User-Projects-%E2%80%93-3rdParty.html) documentation.
Tesseract **can be trained to recognize other languages**.
See [Tesseract Training](https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html) for more information.
## Brief history
Tesseract was originally developed at Hewlett-Packard Laboratories Bristol UK and at Hewlett-Packard Co, Greeley Colorado USA between 1985 and 1994, with some more changes made in 1996 to port to Windows, and some C++izing in 1998. In 2005 Tesseract was open sourced by HP. From 2006 until November 2018 it was developed by Google.
Major version 5 is the current stable version and started with release
[5.0.0](https://github.com/tesseract-ocr/tesseract/releases/tag/5.0.0) on November 30, 2021. Newer minor versions and bugfix versions are available from
[GitHub](https://github.com/tesseract-ocr/tesseract/releases/).
Latest source code is available from [main branch on GitHub](https://github.com/tesseract-ocr/tesseract/tree/main).
Open issues can be found in [issue tracker](https://github.com/tesseract-ocr/tesseract/issues),
and [planning documentation](https://tesseract-ocr.github.io/tessdoc/Planning.html).
See **[Release Notes](https://tesseract-ocr.github.io/tessdoc/ReleaseNotes.html)**
and **[Change Log](https://github.com/tesseract-ocr/tesseract/blob/main/ChangeLog)** for more details of the releases.
## Installing Tesseract
You can either [Install Tesseract via pre-built binary package](https://tesseract-ocr.github.io/tessdoc/Installation.html)
or [build it from source](https://tesseract-ocr.github.io/tessdoc/Compiling.html).
Before building Tesseract from source, please check that your system has a compiler which is one of the [supported compilers](https://tesseract-ocr.github.io/tessdoc/supported-compilers.html).
## Running Tesseract
Basic **[command line usage](https://tesseract-ocr.github.io/tessdoc/Command-Line-Usage.html)**:
tesseract imagename outputbase [-l lang] [--oem ocrenginemode] [--psm pagesegmode] [configfiles...]
For more information about the various command line options use `tesseract --help` or `man tesseract`.
Examples can be found in the [documentation](https://tesseract-ocr.github.io/tessdoc/Command-Line-Usage.html#simplest-invocation-to-ocr-an-image).
## For developers
Developers can use `libtesseract` [C](https://github.com/tesseract-ocr/tesseract/blob/main/include/tesseract/capi.h) or
[C++](https://github.com/tesseract-ocr/tesseract/blob/main/include/tesseract/baseapi.h) API to build their own application. If you need bindings to `libtesseract` for other programming languages, please see the
[wrapper](https://tesseract-ocr.github.io/tessdoc/AddOns.html#tesseract-wrappers) section in the AddOns documentation.
Documentation of Tesseract generated from source code by doxygen can be found on [tesseract-ocr.github.io](https://tesseract-ocr.github.io/).
## Support
Before you submit an issue, please review **[the guidelines for this repository](https://github.com/tesseract-ocr/tesseract/blob/main/CONTRIBUTING.md)**.
For support, first read the [documentation](https://tesseract-ocr.github.io/tessdoc/),
particularly the [FAQ](https://tesseract-ocr.github.io/tessdoc/FAQ.html) to see if your problem is addressed there.
If not, search the [Tesseract user forum](https://groups.google.com/g/tesseract-ocr), the [Tesseract developer forum](https://groups.google.com/g/tesseract-dev) and [past issues](https://github.com/tesseract-ocr/tesseract/issues), and if you still can't find what you need, ask for support in the mailing-lists.
Mailing-lists:
* [tesseract-ocr](https://groups.google.com/g/tesseract-ocr) - For tesseract users.
* [tesseract-dev](https://groups.google.com/g/tesseract-dev) - For tesseract developers.
Please report an issue only for a **bug**, not for asking questions.
## License
The code in this repository is licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
**NOTE**: This software depends on other packages that may be licensed under different open source licenses.
Tesseract uses [Leptonica library](http://leptonica.com/) which essentially
uses a [BSD 2-clause license](http://leptonica.com/about-the-license.html).
## Dependencies
Tesseract uses [Leptonica library](https://github.com/DanBloomberg/leptonica)
for opening input images (e.g. not documents like pdf).
It is suggested to use leptonica with built-in support for [zlib](https://zlib.net),
[png](https://sourceforge.net/projects/libpng) and
[tiff](http://www.simplesystems.org/libtiff) (for multipage tiff).
## Latest Version of README
For the latest online version of the README.md see:
<https://github.com/tesseract-ocr/tesseract/blob/main/README.md>