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

Mostly automatic installation

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

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'
  

Manual installation

iOS

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

Android

1. 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

2. 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')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-tesseract-ocr')
   

4. 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.
 */
RNTesseractOcr.startOcr(imgPath, lang)
  .then((result) => {
    this.setState({ ocrResult: result });
    console.log("OCR Result: ", result);
  })
  .catch((err) => {
    console.log("OCR Error: ", err);
  })
  .done();

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 [email protected]:jonathanpalma/react-native-tesseract-ocr.git
• cd react-native-tesseract-ocr/tesseractOcrSample/
• npm install

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

• Add iOS support
• Optimize ocr for large images

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