Hi.. i'm new to opencv and trying shape detection. I have faced the following error "Unhandled exception (opencv_imgproc243d.dll) in ShapeDetection.exe " Can anyone knows how to solve this???

asked Nov 17 '16

shoebtamboli
1

updated Nov 17 '16

berak
32993 ●7 ●81 ●312

My program,

int main()
{
    //cv::Mat src = cv::imread("polygon.png");
    cv::Mat src;
    cv::Mat gray;
    cv::Mat bw;
    cv::Mat dst;

    std::vector<cv::Point> approx;
    std::vector<std::vector<cv::Point>> contours;

    VideoCapture capture(0);
    int q;

    while (cvWaitKey(30) != 'q')
    {
        capture >> src;
        if (true)
        {
            // Convert to grayscale
            cv::cvtColor(src, gray, CV_BGR2GRAY);

            // Use Canny instead of threshold to catch squares with gradient shading
            blur(gray, bw, Size(3, 3));
            cv::Canny(gray, bw, 80, 240, 3);
            cv::imshow("bw", bw);
            //cv::bitwise_not(bw, bw);

            // Find contours
            cv::findContours(bw.clone(), contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

            src.copyTo(dst);

            for (int i = 0; i < contours.size(); i++)
            {
                // Approximate contour with accuracy proportional
                // to the contour perimeter
                cv::approxPolyDP(cv::Mat(contours[i]), approx, cv::arcLength(cv::Mat(contours[i]), true)*0.02, true);

                // Skip small or non-convex objects
                if (std::fabs(cv::contourArea(contours[i])) < 100 || !cv::isContourConvex(approx))
                    continue;
..................

Facing the problem in the for loop when i=1 and breaks at point cv::approxPolyDP().

Comments

any chance, you're using debug dlls with release build ?

berak (Nov 17 '16)edit

Just saying, OpenCV 2.4.3 is already too old by now. Either upgrade to 2.4.13, or directly move to 3.x branch (3.1?)

LorenaGdL (Nov 17 '16)edit

can we see the rest of the while loop ?

berak (Nov 17 '16)edit

Rest of the while loop...

if (approx.size() == 3) { setLabel(dst, "TRI", contours[i]); // Triangles } else if (approx.size() >= 4 && approx.size() <= 6) { // Number of vertices of polygonal curve int vtc = approx.size();

                    // Get the cosines of all corners
                    std::vector<double> cos;
                    for (int j = 2; j < vtc + 1; j++)
                        cos.push_back(angle(approx[j%vtc], approx[j - 2], approx[j - 1]));

                    // Sort ascending the cosine values
                    std::sort(cos.begin(), cos.end());

                    // Get the lowest and the highest cosine
                    double mincos = cos.front();
                    double maxcos = cos.back();

                    // Use the degrees obtained above and the number of vertices
                    // to determine the shape of the contour
                    if (vtc == 4)
                        setLabel

shoebtamboli (Nov 17 '16)edit

// to determine the shape of the contour if (vtc == 4) setLabel(dst, "RECT", contours[i]); else if (vtc == 5) setLabel(dst, "PENTA", contours[i]); else if (vtc == 6) setLabel(dst, "HEXA", contours[i]); } else { // Detect and label circles double area = cv::contourArea(contours[i]); cv::Rect r = cv::boundingRect(contours[i]); int radius = r.width / 2;

                    if (std::abs(1 - ((double)r.width / r.height)) <= 0.2 &&
                        std::abs(1 - (area / (CV_PI * (radius*radius)))) <= 0.2)
                        setLabel(dst, "CIR", contours[i]);
                }
            }
        cv::imshow("src", src);
        cv::imshow("dst", dst);

    }

shoebtamboli (Nov 17 '16)edit

Also i'll upgrade opencv and test it.... thanks for the reply

shoebtamboli (Nov 17 '16)edit

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Hi.. i'm new to opencv and trying shape detection. I have faced the following error "Unhandled exception (opencv_imgproc243d.dll) in ShapeDetection.exe " Can anyone knows how to solve this???

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Hi.. i'm new to opencv and trying shape detection. I have faced the following error "Unhandled exception (opencv_imgproc243d.dll) in ShapeDetection.exe " Can anyone knows how to solve this???