wr43th13's profile - activity

Yeah this fixes it. Not sure why opencv doc page doesn't assign anything to the params (i.e. Ptr<aruco::DetectorParam

In the code below, similar to the one found in this opencv (ch)aruco board detection doc, i get a segmentation fault from lines involving the DetectorParameters (except the declaration) data structure. Commenting the lines params->cornerRefinementMethod = aruco::CORNER_REFINE_NONE; and aruco::detectMarkers(image, dictionary, corners, ids, params); results in no segmentation fault when executing. I can see the images from the camera (without detecting markers of course).

// charuco board generation
    Ptr<aruco::CharucoBoard> board = aruco::CharucoBoard::create(
        5, 
        7, 
        0.04, 
        0.02, 
        dictionary);
    Mat boardImage;
    board->draw({640, 480}, boardImage, 10, 1);
    imwrite("ArucoBoard.png", boardImage);


    //detection
    VideoCapture inputVideo(0);

    if(!inputVideo.isOpened())  // check if we succeeded
    {        
        cout << "Camera Init Fail\n";
        return -1;
    }

    cout<<"\nAfter check"<<endl;

    Ptr<aruco::DetectorParameters> params;
    params->cornerRefinementMethod = aruco::CORNER_REFINE_NONE;

    cout<<"\nBefore while"<<endl;

    while (inputVideo.grab()) {

        Mat image, imageCopy;
        inputVideo.retrieve(image);
        image.copyTo(imageCopy);

        cout<<"\nCopied image"<<endl;

        vector<int> ids;
        vector<vector<Point2f>> corners;
        aruco::detectMarkers(image, dictionary, corners, ids, params);

        cout<<"\nDetected markers"<<endl;

        // if at least one marker detected
        if (ids.size() > 0) {
            aruco::drawDetectedMarkers(imageCopy, corners, ids);
            vector<Point2f> charucoCorners;
            vector<int> charucoIds;
            aruco::interpolateCornersCharuco(corners, ids, image, board, charucoCorners, charucoIds);
            // if at least one charuco corner detected
            if(charucoIds.size() > 0)
                aruco::drawDetectedCornersCharuco(imageCopy, charucoCorners, charucoIds, Scalar(255, 0, 0));
        }
        imshow("out", imageCopy);
        char key = (char) waitKey(25);
        if (key == 27)
            break;

Yeah this fixes it. Not sure why opencv doc page doesn't assign anything to the params. Thanks, begginer's mistake.

Segmentation fault from DetectorParameters In the code below, similar to the one found in this opencv (ch)aruco board de

Segmentation fault from DetectorParameters In the code below, similar to the one found in this opencv (ch)aruco board de

Segmentation fault from DetectorParameters In the code below, similar to the one found in this opencv (ch)aruco board de

Segmentation fault from DetectorParameters In the code below, similar to the one found in this opencv (ch)aruco detectio

Segmentation fault from DetectorParameters In the code below, similar to the one found in this opencv (ch)aruco detectio