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100 lines
5.8 KiB
Markdown
100 lines
5.8 KiB
Markdown
# Tesseract OCR
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[](https://travis-ci.org/tesseract-ocr/tesseract)
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[](https://ci.appveyor.com/project/zdenop/tesseract/)
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[](https://scan.coverity.com/projects/tesseract-ocr)
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[](https://insight.io/github.com/tesseract-ocr/tesseract)
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## About
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This package contains an **OCR engine** - `libtesseract` and a **command line program** - `tesseract`.
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The lead developer is Ray Smith. The maintainer is Zdenko Podobny.
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For a list of contributors see [AUTHORS](https://github.com/tesseract-ocr/tesseract/blob/master/AUTHORS)
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and GitHub's log of [contributors](https://github.com/tesseract-ocr/tesseract/graphs/contributors).
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Tesseract has **unicode (UTF-8) support**, and can **recognize more than 100 languages** "out of the box".
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Tesseract supports **various output formats**: plain-text, hocr(html), pdf, tsv, invisible-text-only pdf.
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You should note that in many cases, in order to get better OCR results, you'll need to **[improve the quality](https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality) of the image** you are giving Tesseract.
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This project **does not include a GUI application**. If you need one, please see the [3rdParty](https://github.com/tesseract-ocr/tesseract/wiki/User-Projects-%E2%80%93-3rdParty) wiki page.
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Tesseract **can be trained to recognize other languages**. See [Tesseract Training](https://github.com/tesseract-ocr/tesseract/wiki/TrainingTesseract) for more information.
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## Brief history
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Tesseract was originally developed at Hewlett-Packard Laboratories Bristol and
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at Hewlett-Packard Co, Greeley Colorado between 1985 and 1994, with some
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more changes made in 1996 to port to Windows, and some C++izing in 1998.
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In 2005 Tesseract was open sourced by HP. Since 2006 it is developed by Google.
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The latest stable version is **[3.05.01](https://github.com/tesseract-ocr/tesseract/releases/tag/3.05.01)**, released on June 1, 2017. Latest source code for 3.05 is available from [3.05 branch on github](https://github.com/tesseract-ocr/tesseract/tree/3.05).
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Source code for the new **[LSTM based 4.00.00alpha version](https://github.com/tesseract-ocr/tesseract)** is available from the master branch on github. Please note this branch is under active development.
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See **[Release Notes](https://github.com/tesseract-ocr/tesseract/wiki/ReleaseNotes)** and **[Change Log](https://github.com/tesseract-ocr/tesseract/blob/master/ChangeLog)** for more details of the releases.
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## Installing Tesseract
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You can either [Install Tesseract via pre-built binary package](https://github.com/tesseract-ocr/tesseract/wiki) or [build it from source](https://github.com/tesseract-ocr/tesseract/wiki/Compiling).
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Supported Compilers are:
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* GCC 4.8 and above
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* Clang 3.4 and above
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* MSVC 2015, 2017
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Other compilers might work, but are not officially supported.
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## Running Tesseract
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Basic **[command line usage](https://github.com/tesseract-ocr/tesseract/wiki/Command-Line-Usage)**:
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tesseract imagename outputbase [-l lang] [--oem ocrenginemode] [--psm pagesegmode] [configfiles...]
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For more information about the various command line options use `tesseract --help` or `man tesseract`.
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## For developers
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Developers can use `libtesseract` [C](https://github.com/tesseract-ocr/tesseract/blob/master/api/capi.h) or [C++](https://github.com/tesseract-ocr/tesseract/blob/master/api/baseapi.h) API to build their own application. If you need bindings to `libtesseract` for other programming languages, please see the [wrapper](https://github.com/tesseract-ocr/tesseract/wiki/AddOns#tesseract-wrappers) section on AddOns wiki page.
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Documentation of Tesseract generated from source code by doxygen can be found on [tesseract-ocr.github.io](http://tesseract-ocr.github.io/).
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## Support
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Before you submit an issue, please review **[the guidelines for this repository](https://github.com/tesseract-ocr/tesseract/blob/master/CONTRIBUTING.md)**.
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For support, first read the [Wiki](https://github.com/tesseract-ocr/tesseract/wiki), particularly the [FAQ](https://github.com/tesseract-ocr/tesseract/wiki/FAQ) to see if your problem is addressed there. If not, search the [Tesseract user forum](https://groups.google.com/d/forum/tesseract-ocr), the [Tesseract developer forum](https://groups.google.com/d/forum/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.
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Mailing-lists:
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* [tesseract-ocr](https://groups.google.com/d/forum/tesseract-ocr) - For tesseract users.
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* [tesseract-dev](https://groups.google.com/d/forum/tesseract-dev) - For tesseract developers.
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Please report an issue only for a **bug**, not for asking questions.
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## License
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The code in this repository is licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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**NOTE**: This software depends on other packages that may be licensed under different open source licenses.
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## Latest Version of README
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For the latest online version of the README.md see:
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https://github.com/tesseract-ocr/tesseract/blob/master/README.md
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