Opencv異常fillconvexppoly

Question

我想將一段代碼從python移植到C++。我需要繪製黑色的圖像（多邊形）的一部分。

在python中，我有點的列表，然後我調用fillconvexpolygon來做到這一點。 我試着在相同C++，但我得到這個異常：

OpenCV Error: Assertion failed (points.checkVector(2, CV_32S) >= 0) in fillConvexPoly, file /home/user/template_matching/repositories/opencv/modules/core/src/drawing.cpp, line 2017 
terminate called after throwing an instance of 'cv::Exception' 
    what(): /home/user/template_matching/repositories/opencv/modules/core/src/drawing.cpp:2017: error: (-215) points.checkVector(2, CV_32S) >= 0 in function fillConvexPoly 

我能畫在圖像上線，我在用多邊形輪廓點列表點：

drawMatches(img_object, TSMART_BANKNOTE[i].kp, img_orig, BankNote_t.kp, 
      good, img_matches, Scalar::all(-1), Scalar::all(-1), 
      vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS); 
line(img_matches, scene_corners[0] + Point2f(img_object.cols, 0), 
         scene_corners[1] + Point2f(img_object.cols, 0), 
                Scalar(0, 255, 0), 4); //Left side 

line(img_matches, scene_corners[2] + Point2f(img_object.cols, 0), 
         scene_corners[3] + Point2f(img_object.cols, 0), 
                Scalar(0, 255, 0), 4); //right side 

line(img_matches, scene_corners[1] + Point2f(img_object.cols, 0), 
         scene_corners[2] + Point2f(img_object.cols, 0), 
                Scalar(0, 255, 0), 4); //Down line 

line(img_matches, scene_corners[3] + Point2f(img_object.cols, 0), 
         scene_corners[0] + Point2f(img_object.cols, 0), 
                Scalar(0, 255, 0), 4);  //Up line 

    vector<Point2f> pt; 
pt.push_back(Point2f(scene_corners[0].x + img_object.cols, 
         scene_corners[1].y)); 

pt.push_back(Point2f(scene_corners[2].x + img_object.cols, 
         scene_corners[3].y)); 

pt.push_back(Point2f(scene_corners[1].x + img_object.cols, 
         scene_corners[2].y)); 

pt.push_back(Point2f(scene_corners[3].x + img_object.cols, 
         scene_corners[0].y)); 
std::cout << "PT POINTS: " << pt.size() <<"\r\n"; 

    //fillConvexPoly(img_matches, pt, pt.size(), Scalar(1,1,1), 16, 0); 

    fillConvexPoly(img_matches, pt, cv::Scalar(255), 16, 0); 
    //-- Show detected matches 
std::cout <<"H5\r\n"; 
imshow("Good Matches & Object detection", img_matches); 
    waitKey(0); 

在文檔中，我找到了一個fillconvexpoly函數，它接收向量的大小。我似乎不接受這一點。我正在使用opencv 2.4.6

Answer 1

異常說它正在檢查CV_32S類型（有符號整數），其中您的點是浮點類型。

更換你

std::vector<cv::Point2f> pt; 

與

std::vector<cv::Point2i> pt;