我正在尝试将轮廓转换为一组多边形曲线,但是当我尝试使用 approxPolyDP 函数时我被卡住了。首先我测试了 findContours 是否正常工作并尝试在我的图像中绘制轮廓 - 它适用于 contourIdx = 0。然后我尝试使用 approxPolyDp,如示例所示:http ://docs.opencv.org/doc/tutorials/imgproc/ shapedescriptors/bounding_rects_circles/bounding_rects_circles.html
但是在执行过程中,我遇到了与向量类和函数大小()相关的错误“访问冲突”。这是我的代码:
IplImage* image = cvLoadImage("F:\\triangle.png");
waitKey(5000);
//Mat img = imread("triangle.png");
Mat img(image,true);
if(!img.data)
{
cout <<"image file not found";
cv::waitKey(5000);
return -1;
}
//namedWindow( "window", 0 );
//imshow( "window", img );
cvNamedWindow("window");
cvShowImage("window",image);
Mat imgGray;
Mat imgEdges;
cvtColor(img,imgGray,CV_BGR2GRAY);
blur(imgGray,imgGray,Size(3,3));
threshold(imgGray,imgEdges,128,255,CV_THRESH_BINARY);
Mat canny_output;
vector<vector<Point>> contours;
vector<Vec4i> hierarchy;
/// Detect edges using canny
Canny( imgGray, canny_output,100, 100*2, 3 );
/// Find contours
findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
/// Draw contours
RNG rng(12345);
Mat drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
if (drawing.type() != CV_8UC3)
{
cout << "Error: image type different then CV_8UC3";
}
Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
drawContours( drawing, contours, 0, color, 2, 8, hierarchy, 0, Point() );
IplImage img3 = drawing;
cvNamedWindow( "Contours", CV_WINDOW_AUTOSIZE );
cvShowImage( "Contours", &img3 );
vector<vector<Point>> contoursOUT/*(contours.size())*/;
approxPolyDP(Mat(contours[0]),contoursOUT,3,true );
waitKey(0);
return 0;
有谁知道这里有什么问题?