圆hough中心坐标

Question

在opencv中，我使用Hough变换来查找圆，这里是代码

HoughCircles (diff, circles, CV_HOUGH_GRADIENT, 2, src.cols / 5, 200, 80, 20, 62);    
for (size_t i = 0; i < circles.size(); i++ )
{
    //if(circles[i][2]<62)
    {
        Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
        int radius = cvRound(circles[i][2]);
        // draw the green circle center
        circle( src, center, 3, Scalar(0,255,255), -1, 8, 0 );
        // draw the blue circle outline
        circle(src, center, radius, Scalar(0,255,0), 3, 8, 0 );
    }
}

我面临的问题是，有时在它找到3个圆的情况下，第三个圆心坐标是分数，而不是整数。如果它找到4个圆，它会给出这个错误

xyz.exe中0x75ebc41f处未处理的异常：Microsoft C++异常：cv:：内存位置0x002df08c出现异常。。

如果我尝试cout中心坐标。

Answer 1

嗯，这很有趣。我运行了你的代码，并在之前和之后填写了，没有任何问题。老实说，我只在linux和mac机器上测试过。这是我的全长代码，试试看会发生什么。此外，请在此处查看此解决方案。

int main(int argc, char* argv[]) {
VideoCapture capture(0);
if (!capture.isOpened()) {
    LOG(FATAL) << "COULD NOT OPEN CAPTURE";
}
Mat frame;
capture >> frame;
if (frame.empty()) {
    LOG(FATAL) << "FRAME IS EMPTY!";
}
char key;
while ((int)key != 27) {
    capture >> frame;
    Mat gray;
    cvtColor(frame, gray, CV_BGR2GRAY);
    GaussianBlur(gray, gray, Size(9, 9), 2, 2);
    vector<Vec3f> circles;
    HoughCircles(gray, circles, CV_HOUGH_GRADIENT, 2, gray.cols/5,200,80,20,62);
    for (size_t i = 0; i < circles.size(); ++i) {
        Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
        int radius = cvRound(circles[i][2]);
        // draw the green circle center
        circle(frame, center, 3, Scalar(0,255,255), -1, 8, 0 );
        // draw the blue circle outline
        circle(frame, center, radius, Scalar(0,255,0), 3, 8, 0 );
    }
    imshow("frame", frame);
    key = waitKey(1);
}
return 0;
}