Please pardon any bad English as this is my first time posting question on stackoverflow.
I would like to create a OCR Android Application using tesseract OCR engine and faced the following error, I have tried to search around but however did not find any solution, would appreciate your help. Thanks.
Codes I am trying:
TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(Environment.getExternalStorageDirectory().toString()+"/", `"eng");`
I have already created a tessdata folder in my device root with the eng.traineddata file inside, but I was prompted the following error when I access the function.
Could not initialize Tesseract API with language=eng!
I am using Android 6.0.1, API 23
Would appreciate any help! Thanks in advance~
Try this code out . It allows you to take a picture and displays the text .There are minor bugs in this code .Try this code on letters typed in notepad Ignore the various files being placed in the tessdata folder . I am trying to read maths equation hence i need those . I have commented out the other files, it shouldn't bother you. If you are willing to try , try Mobile Vision API. Hope this helps :)
public class MainActivity extends AppCompatActivity {
String imgPath;
Bitmap imgBitmap;
Uri imgUri;
InputStream trainDataInputStream;
OutputStream trainDataOutputStream;
AssetManager assetManager;
String externalDataPath;
TextView t;
String[] fileToBeCopied = {"eng.cube.bigrams", "eng.cube.fold", "eng.cube.lm", "eng.cube.nn", "eng.cube.params", "eng.cube.size", "eng.cube.word-freq", "eng.tesseract_cube.nn", "eng.traineddata","equ.traineddata"};
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
t = (TextView) findViewById(R.id.text);
new CopyFile().execute();
//placeFileFromAssetsToExternalStorage();
takePicture();
}
class CopyFile extends AsyncTask {
@Override
protected void onPreExecute() {
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Fetching image...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Object doInBackground(Object[] objects) {
//placeFileFromAssetsToExternalStorage(fileToBeCopied[0]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[1]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[2]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[3]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[4]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[5]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[6]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[7]);
placeFileFromAssetsToExternalStorage(fileToBeCopied[8]);
//placeFileFromAssetsToExternalStorage(fileToBeCopied[9]);
return null;
}
@Override
protected void onPostExecute(Object o) {
pDialog.dismiss();
}
}
private void takePicture() {
File photoFile = null;
Intent iPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (iPicture.resolveActivity(getPackageManager()) != null) {
try {
photoFile = createImageFile();
} catch (Exception e) {
e.printStackTrace();
}
//if photo file is created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(getApplicationContext(), "com.scorpio.fileprovider", photoFile);
System.out.println(imgPath);
iPicture.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(iPicture, 1);
}
}
}
private File createImageFile() {
File imgFile = null;
String fileStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File storageDir = Environment.getExternalStorageDirectory();
try {
imgFile = File.createTempFile(fileStamp, ".jpeg", storageDir);
} catch (IOException e) {
e.printStackTrace();
}
imgPath = imgFile.getAbsolutePath();
return imgFile;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1 && resultCode == RESULT_OK) {
galleryAddPic();
}
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(imgPath);
System.out.println("Image path ->" + imgPath);
Uri contentUri = Uri.fromFile(f);
imgUri = contentUri;
System.out.println("Image uri " + imgUri);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
ocrImage();
}
public void ocrImage() {
try {
//getting image for ocr
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 4;
imgBitmap = BitmapFactory.decodeFile(imgPath, options);
} catch (Exception e) {
e.printStackTrace();
}
ExifInterface exif = null;
try {
exif = new ExifInterface(imgPath);
} catch (IOException e) {
e.printStackTrace();
}
int exifOrientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
int rotate = 0;
switch (exifOrientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
}
if (rotate != 0) {
int w = imgBitmap.getWidth();
int h = imgBitmap.getHeight();
// Setting pre rotate
Matrix mtx = new Matrix();
mtx.preRotate(rotate);
// Rotating Bitmap & convert to ARGB_8888, required by tess
imgBitmap = Bitmap.createBitmap(imgBitmap, 0, 0, w, h, mtx, false);
}
imgBitmap = imgBitmap.copy(Bitmap.Config.ARGB_8888, true);
TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(externalDataPath, "eng");
baseApi.setImage(imgBitmap);
String ocrResult = baseApi.getUTF8Text();
System.out.println(ocrResult);
baseApi.end();
t.setText(ocrResult);
}
public void placeFileFromAssetsToExternalStorage(String filename) {
System.out.println("Running DataRunnable class ");
assetManager = getResources().getAssets();
externalDataPath = Environment.getExternalStorageDirectory() + "/tessdata";
System.out.println("external data path " + externalDataPath);
//creating eng.trainedData
File f = new File(externalDataPath);
try {
if (!f.exists()) {
f.mkdir();
}
externalDataPath = externalDataPath + "/" + filename;
f = new File(externalDataPath);
if (!f.exists())
f.createNewFile();
externalDataPath = Environment.getExternalStorageDirectory().toString();
trainDataInputStream = assetManager.open(filename);
trainDataOutputStream = new FileOutputStream(f);
byte[] buffer = new byte[1024];
int read;
while ((read = trainDataInputStream.read(buffer)) != -1) {
trainDataOutputStream.write(buffer, 0, read);
}
trainDataOutputStream.flush();
trainDataOutputStream.close();
trainDataInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}