title: Unable to load classifier in OpenCV for Android
body: <p>I want to use face and eye classifiers in my application. The concept is to copy the contents of the classifiers xml files you have under Resources.Raw and add them to some folder under the application using <code>InputStream</code> and <code>OutputStream</code>, then try to load these classifiers from that folder to use them in the app. I'm using the code available here for this purpose, </p>
  
  <p><a href="http://romanhosek.cz/android-eye-detection-updated-for-opencv-2-4-6/" rel="nofollow">http://romanhosek.cz/android-eye-detection-updated-for-opencv-2-4-6/</a></p>
  
  <p>Here is the code portion that loads the classifiers: </p>
  
  <pre><code> try {
                  // load cascade file from application resources
                  InputStream is = getResources().openRawResource(
                          R.raw.lbpcascade_frontalface);
                  File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);
                  mCascadeFile = new File(cascadeDir,
                          "lbpcascade_frontalface.xml");
                  FileOutputStream os = new FileOutputStream(mCascadeFile);
  
                  byte[] buffer = new byte[4096];
                  int bytesRead;
                  while ((bytesRead = is.read(buffer)) != -1) {
                      os.write(buffer, 0, bytesRead);
                  }
                  is.close();
                  os.close();
  
                  // --------------------------------- load left eye
                  // classificator -----------------------------------
                  InputStream iser = getResources().openRawResource(
                          R.raw.haarcascade_lefteye_2splits);
                  File cascadeDirER = getDir("cascadeER",
                          Context.MODE_PRIVATE);
                  File cascadeFileER = new File(cascadeDirER,
                          "haarcascade_eye_right.xml");
                  FileOutputStream oser = new FileOutputStream(cascadeFileER);
  
                  byte[] bufferER = new byte[4096];
                  int bytesReadER;
                  while ((bytesReadER = iser.read(bufferER)) != -1) {
                      oser.write(bufferER, 0, bytesReadER);
                  }
                  iser.close();
                  oser.close();
  
                  mJavaDetector = new CascadeClassifier(
                          mCascadeFile.getAbsolutePath());
                  if (mJavaDetector.empty()) {
                      Toast.makeText(getApplicationContext(), "face classifier error", Toast.LENGTH_LONG).show();
                      Log.e(TAG, "Failed to load cascade face classifier");
                      mJavaDetector = null;
                  } else
                      Log.i(TAG, "Loaded cascade classifier from "
                              + mCascadeFile.getAbsolutePath());
  
                  mJavaDetectorEye = new CascadeClassifier(
                          cascadeFileER.getAbsolutePath());
                  if (mJavaDetectorEye.empty()) {
                      Toast.makeText(getApplicationContext(), "eye classifer error", Toast.LENGTH_LONG).show();
                      Log.e(TAG, "Failed to load cascade eye classifier");
                      mJavaDetectorEye = null;
                  } else
                      Log.i(TAG, "Loaded cascade classifier from "
                              + mCascadeFile.getAbsolutePath());
  
  
  
                  cascadeDir.delete();
  
              } catch (IOException e) {
                  e.printStackTrace();
                  Log.e(TAG, "Failed to load cascade. Exception thrown: " + e);
              }
  </code></pre>
  
  <p>When running the app I get these two error messages in the logcat: </p>
  
  <pre><code>Failed to load cascade face classifier
  
  Failed to load cascade eye classifier
  </code></pre>
  
  <p>As can be seen from the code, these are only generated if there is a problem loading the classifiers. </p>
  
  <p>I use <strong>Android Studio, and OpenCV for Android V 3.1</strong>. I have also tried to download the latest SDK build tools, but that didn't solve the problem. project. </p>
  
  <p>Can anyone please tell me how to solve this problem? </p>
  
  <p>Thanks. </p>