Wednesday, March 18, 2020

Monday, March 2, 2020

[Android] OCR - 使用 Tesseract


[參考資料]





[需要權限]

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

[Gradle]
build.gradle (Module:app)
implementation 'com.rmtheis:tess-two:9.0.0'
[使用方式]

public String runOcr( Bitmap bmp){

    final TessBaseAPI ocrApi = new TessBaseAPI();
    ocrApi.init( pathTessBase, "chi_tra");
    ocrApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_AUTO);
    ocrApi.setImage(bmp);
    String resString = ocrApi.getUTF8Text();

    ocrApi.clear();
    ocrApi.end();
    return  resString;
}



[註]
1. 訓練資料檔 chi_tra.traineddata 必須放在 pathThessBase/tessdata 資料夾下.

2. PageSegmentationMode = TessBaseAPI.PageSegMode.PSM_SINGLE_LINE 只可辨識單行文字

    PageSegmentationMode = TessBaseAPI.PageSegMode.PSM_AUTO 可辨識多行文字

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 [Reference]  https://www.qnap.com/zh-tw/how-to/faq/article/%E7%82%BA%E4%BB%80%E9%BA%BC%E7%84%A1%E6%B3%95%E5%9C%A8-phpmyadmin-%E5%AD%98%E5%8...