Android OCR使用Tesseract

Question

I am trying to built an OCR Application in android using Tesseract Library.

Here is the code attached:

public class TessOCR {
    private TessBaseAPI mTess;

public TessOCR() {
    // TODO Auto-generated constructor stub

    mTess = new TessBaseAPI();
    String datapath = Environment.getExternalStorageDirectory() + "/tesseract/";
    String language = "sseg";
    File dir = new File(datapath + "tessdata/");
    if (!dir.exists())
        dir.mkdirs();
    mTess.init(datapath, language);


}

public String getOCRResult(Bitmap bitmap) {

    mTess.setImage(bitmap);
    String result = mTess.getUTF8Text();

    return result;
}

public void onDestroy() {
    if (mTess != null)
        mTess.end();
}

When I am calling new TessOCR() in my MainAcitivity It gives me the error

09-02 16:10:56.677 14225-14225/com.example.pulkitmital.swipetabtoolbar E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.pulkitmital.swipetabtoolbar, PID: 14225 java.lang.IllegalArgumentException: Data path must contain subfolder tessdata! at com.googlecode.tesseract.android.TessBaseAPI.init(TessBaseAPI.java:344) at com.googlecode.tesseract.android.TessBaseAPI.init(TessBaseAPI.java:317) at com.example.pulkitmital.swipetabtoolbar.TessOCR.(TessOCR.java:22) at com.example.pulkitmital.swipetabtoolbar.Tab1.doOCR(Tab1.java:326) at com.example.pulkitmital.swipetabtoolbar.Tab1.access$000(Tab1.java:42) at com.example.pulkitmital.swipetabtoolbar.Tab1$3.onClick(Tab1.java:168) at android.view.View.performClick(View.java:4785) at android.view.View$PerformClick.run(View.java:19884) at android.os.Handler.handleCallback(Handler.java:746) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5343) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700 )

But the folder is already there.

Please help me to get rid of this problem.

Answer 1

Replace this line :

mTess.init(datapath, language);

with :

mTess.init(datapath + "tessdata/", language);

Answer 2

Basically Error is due to I forget to add permission to read from external storage in manifest file.

<uses-permission
        android:name="android.permission.READ_EXTERNAL_STORAGE"
        android:maxSdkVersion="18" />

Just Add this line to your AndroidManifest and it will get resolved.

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