Android Bitmap Fatal signal 11 (SIGSEGV)

Question

I am developing an Android application and take a picture and recognize it.
I get this error once and sometimes without changing the code,

ERROR: 01-08 20:41:59.940: A/libc(10967): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1)

I have a method that crop the image so that the user selects the text:

 private void performCrop(){ File file = new File(_path); Uri outputFileUri = Uri.fromFile(file); try{ //call the standard crop action intent (the user device may not support it) Intent cropIntent = new Intent("com.android.camera.action.CROP"); cropIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); //indicate image type and Uri cropIntent.setDataAndType(picUri, "image/*"); //set crop properties cropIntent.putExtra("crop", "true"); //indicate aspect of desired crop cropIntent.putExtra("aspectX", 5); cropIntent.putExtra("aspectY", 1); //indicate output X and Y cropIntent.putExtra("outputX", 500); cropIntent.putExtra("outputY", 100); //retrieve data on return cropIntent.putExtra("return-data", true); //start the activity - we handle returning in onActivityResult startActivityForResult(cropIntent, 2); }catch(ActivityNotFoundException anfe){ //display an error message String errorMessage = "Whoops - your device doesn't support the crop action!"; Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT); toast.show(); } catch (Exception ex) { Log.v(TAG, ex.toString()); } } 

and here is the method that runs OCR:

 protected void onPhotoTaken() { _taken = true; BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 2; Bitmap bitmap = BitmapFactory.decodeFile(_path, options); try { ExifInterface exif = new ExifInterface(_path); int exifOrientation = exif.getAttributeInt( ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); Log.v(TAG, "Orient: " + exifOrientation); 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; } Log.v(TAG, "Rotation: " + rotate); if (rotate != 0) { // Getting width & height of the given image. int w = bitmap.getWidth(); int h = bitmap.getHeight(); // Setting pre rotate Matrix mtx = new Matrix(); mtx.preRotate(rotate); // Rotating Bitmap bitmap = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, false); } // Convert to ARGB_8888, required by tess bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true); } catch (IOException e) { Log.e(TAG, "Couldn't correct orientation: " + e.toString()); } // _image.setImageBitmap( bitmap ); Log.v(TAG, "Before baseApi"); TessBaseAPI baseApi = new TessBaseAPI(); baseApi.setDebug(true); baseApi.init(DATA_PATH, lang); baseApi.setImage(bitmap); String recognizedText = baseApi.getUTF8Text(); baseApi.end(); // You now have the text in recognizedText var, you can do anything with it. // We will display a stripped out trimmed alpha-numeric version of it (if lang is eng) // so that garbage doesn't make it to the display. Log.v(TAG, "OCRED TEXT: " + recognizedText); if ( lang.equalsIgnoreCase("eng") ) { recognizedText = recognizedText.replaceAll("[^a-zA-Z0-9]+", " "); } recognizedText = recognizedText.trim(); if ( recognizedText.length() != 0 ) { _field.setText(_field.getText().toString().length() == 0 ? recognizedText : _field.getText() + " " + recognizedText); _field.setSelection(_field.getText().toString().length()); } // Cycle done. } 

Answer 1

One suggestion is the problem of initializing ExifInterface.

The ExifInterface constructor has a serious error. It will not check if the string of the filename argument is zero or not, and no exception will be thrown, so the JNI results for SIGSEGV fail.

The next post will help you (sorry, this post is in Japanese ...) http://alpha.mixi.co.jp/2013/11572/ http://alpha.mixi.co.jp/images/android-compat-jni -crash-exif.png

So, you should check the value of _path before initializing the ExifInterface object.