hello i am trying to detect the aruco marker but i am getting error No implementation found for long org.opencv.aruco.Aruco.getPredefinedDictionary based on my code
public class MainActivity extends Activity implements CameraBridgeViewBase.CvCameraViewListener2 {
private static final String TAG = "MainActivity";
private CameraBridgeViewBase mOpenCvCameraView;
private Dictionary mDictionary;
private MatOfInt mIds;
private List<Mat> mCorners;
private boolean isDetecting = false;
private Button btnDetectMarker;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
Log.i(TAG, "OpenCV loaded successfully");
mOpenCvCameraView.enableView();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
mOpenCvCameraView = findViewById(R.id.camera_view);
mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
btnDetectMarker = findViewById(R.id.btn_detect_marker);
btnDetectMarker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isDetecting = true;
}
});
mDictionary = Aruco.getPredefinedDictionary(Aruco.DICT_5X5_50);
mIds = new MatOfInt();
mCorners = new ArrayList<>();
}
@Override
protected void onResume() {
super.onResume();
if (OpenCVLoader.initDebug()) {
Log.d(TAG, "OpenCV initialization succeeded");
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
} else {
Log.d(TAG, "OpenCV initialization failed");
Toast.makeText(this, "OpenCV initialization failed", Toast.LENGTH_LONG).show();
}
}
@Override
protected void onPause() {
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public void onCameraViewStarted(int width, int height) {
}
@Override
public void onCameraViewStopped() {
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
Mat frame = inputFrame.rgba();
if (isDetecting) {
Mat gray = inputFrame.gray();
mIds = new MatOfInt();
mCorners.clear();
// Detect markers
Aruco.detectMarkers(gray, mDictionary, mCorners, mIds);
// Draw markers and measure width and height
if (mIds.total() > 0) {
Aruco.drawDetectedMarkers(frame, mCorners, mIds, new Scalar(255, 0, 0));
for (Mat corners : mCorners) {
if (corners.rows() == 1 && corners.cols() == 4) {
for (int i = 0; i < 4; i++) {
Imgproc.line(frame,
new org.opencv.core.Point(corners.get(0, i)),
new org.opencv.core.Point(corners.get(0, (i + 1) % 4)),
new Scalar(0, 255, 0), 2);
}
double width = Math.sqrt(Math.pow(corners.get(0, 0)[0] - corners.get(0, 1)[0], 2) +
Math.pow(corners.get(0, 0)[1] - corners.get(0, 1)[1], 2));
double height = Math.sqrt(Math.pow(corners.get(0, 1)[0] - corners.get(0, 2)[0], 2) +
Math.pow(corners.get(0, 1)[1] - corners.get(0, 2)[1], 2));
Log.d(TAG, "Width: " + width + ", Height: " + height);
}
}
}
// Reset the flag
isDetecting = false;
}
return frame;
}
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