Android, OCR Library, Image -> Text

- language data file download
https://github.com/tesseract-ocr/tessdata


- Gradle

dependencies {
    ...
    compile 'com.rmtheis:tess-two:5.4.1'}

- Permission

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

- language data file
1. set langage data file in assets
2. copy language data file to external storage (in code)
(must under subfolder tessdata)

val tdataPath = File(dataFolder.absoluteFile.toString() + "/eng.traineddata")

val input = assets.open("eng.traineddata");
val output = FileOutputStream(tdataPath)

try{
    input.copyTo(output)
}catch(e : Exception){}

- module init

mTess.init(datafolder, "eng")


datafolder : set folder path exist tessdata folder

ref : https://qiita.com/Nunocky/items/35770ffc719d55ba0078