react-native-tesseract-ocr

react-native-tesseract-ocr is a react-native wrapper for Tesseract OCR using base on

tess-two for Android
Tesseract-OCR-iOS for iOS (Not implemented yet)

Getting started

$ npm install react-native-tesseract-ocr --save

$ yarn add react-native-tesseract-ocr

Mostly automatic installation

$ react-native link react-native-tesseract-ocr

Don't forget to ...

add v3.04 trained data files to the appropriate folder
*add on android/build.gradle ... implementation 'com.android.support:multidex:1.1.0' // use latest version ...
install CocoaPods in your react-native project and add the following line to your Podfile then run pod install (iOS only)
```
pod 'TesseractOCRiOS', '4.0.0'
```

Manual installation

iOS

In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
Go to node_modules ➜ react-native-tesseract-ocr and add RNTesseractOcr.xcodeproj
In XCode, in the project navigator, select your project. Add libRNTesseractOcr.a to your project's Build Phases ➜ Link Binary With Libraries
Run your project (Cmd+R)<

Android

Open up android/app/src/main/java/[...]/MainActivity.java

Add import com.reactlibrary.RNTesseractOcrPackage; to the imports at the top of the file
Add new RNTesseractOcrPackage() to the list returned by the getPackages() method

Append the following lines to android/settings.gradle:

include ':react-native-tesseract-ocr'
project(':react-native-tesseract-ocr').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-tesseract-ocr/android')

Insert the following lines inside the dependencies block in android/app/build.gradle:
```
  compile project(':react-native-tesseract-ocr')
```
v3.04 Trained data files for a language must be extracted in android/app/src/main/assets/tessdata.

Usage

import RNTesseractOcr from 'react-native-tesseract-ocr';


/**
 * @param {string} imgPath - The path of the image.
 * @param {string} lang - The language you want to process.
 * @param {object} tessOptions - Tesseract options.
 */
 const tessOptions = {
  whitelist: null, 
  blacklist: '1234567890\'!"#$%&/()={}[]+*-_:;<>'
};
RNTesseractOcr.recognize(imgPath, lang, tessOptions)
  .then((result) => {
    this.setState({ ocrResult: result });
    console.log("OCR Result: ", result);
  })
  .catch((err) => {
    console.log("OCR Error: ", err);
  })
  .done();

NOTE: The method startOcr is deprecated. Instead, use recognize

Supported languages

LANG_AFRIKAANS
LANG_AMHARIC
LANG_ARABIC
LANG_ASSAMESE
LANG_AZERBAIJANI
LANG_BELARUSIAN
LANG_BOSNIAN
LANG_BULGARIAN
LANG_CHINESE_SIMPLIFIED
LANG_CHINESE_TRADITIONAL
LANG_CROATIAN
LANG_DANISH
LANG_ENGLISH
LANG_ESTONIAN
LANG_FRENCH
LANG_GALICIAN
LANG_GERMAN
LANG_HEBREW
LANG_HUNGARIAN
LANG_ICELANDIC
LANG_INDONESIAN
LANG_IRISH
LANG_ITALIAN
LANG_JAPANESE
LANG_KOREAN
LANG_LATIN
LANG_LITHUANIAN
LANG_NEPALI
LANG_NORWEGIAN
LANG_PERSIAN
LANG_POLISH
LANG_PORTUGUESE
LANG_RUSSIAN
LANG_SERBIAN
LANG_SLOVAK
LANG_SPANISH
LANG_SWEDISH
LANG_TURKISH
LANG_UKRAINIAN
LANG_VIETNAMESE

If you want to use your own trained data file

LANG_CUSTOM

Locate your own trained data file as custom.traineddata into android/app/src/main/assets/tessdata.

Example

Try the included TesseractOcrSample:

git clone git@github.com:jonathanpalma/react-native-tesseract-ocr.git
cd react-native-tesseract-ocr/tesseractOcrSample/
npm install or yarn

NOTE: Don't forget to ...

add v3.04 trained data files to the appropriate folder
install CocoaPods in your react-native project and add the following line to your Podfile then run pod install (iOS only)
```
pod 'TesseractOCRiOS', '4.0.0'
```

TODOS

Check the project boards

Contribution

Contributions are welcome 🙌

License

This repository is distributed under MIT license

Tesseract OCR - maintained by Google, is distributed under Apache 2.0 license
tess-two is distributed under Apache 2.0 license
Tesseract-OCR-iOS is distributed under MIT license

aristech/react-native-tesseract-ocr