我正在尝试编写用于Blob检测的代码,我在这里遵循教程 https://www.learnopencv.com/blob-detection-using-opencv-python-c/ 我刚刚复制并粘贴了代码
Mat im = imread("blob.jpg", IMREAD_GRAYSCALE);
// Set up the detector with default parameters.
SimpleBlobDetector detector;
// Detect blobs.
std::vector<KeyPoint> keypoints;
detector.detect(im, keypoints);
// Draw detected blobs as red circles.
// DrawMatchesFlags::DRAW_RICH_KEYPOINTS flag ensures the size of the circle corresponds to the size of blob
Mat im_with_keypoints;
drawKeypoints(im, keypoints, im_with_keypoints, Scalar(0, 0, 255), DrawMatchesFlags::DRAW_RICH_KEYPOINTS);
// Show blobs
imshow("keypoints", im_with_keypoints);
当我运行它时,我收到错误
drawKeypoints(im, keypoints, im_with_keypoints, Scalar(0, 0, 255), DrawMatchesFlags::DRAW_RICH_KEYPOINTS);
说“未处理的异常”,:Microsoft C ++:cv :: Exception
我该如何解决这个问题?
答案 0 :(得分:1)
在没有编码的情况下完成本教程后,我已经意识到在本文开头发布的代码没有指定探测器的参数。指定它们后,程序现在正常工作。这是完整的代码:
#include "opencv2\opencv.hpp"
using namespace cv;
``int main() {
//LOAD THE IMAGE
Mat im = imread("../data/blob.jpg", IMREAD_GRAYSCALE);
// Setup SimpleBlobDetector parameters.
SimpleBlobDetector::Params params;
// Change thresholds
params.minThreshold = 10;
params.maxThreshold = 200;
// Filter by Area.
params.filterByArea = true;
params.minArea = 1500;
// Filter by Circularity
params.filterByCircularity = true;
params.minCircularity = 0.1;
// Filter by Convexity
params.filterByConvexity = true;
params.minConvexity = 0.87;
// Filter by Inertia
params.filterByInertia = true;
params.minInertiaRatio = 0.01;
// Storage for blobs
vector<KeyPoint> keypoints;
Ptr<SimpleBlobDetector> detector = SimpleBlobDetector::create(params);
// Detect blobs
detector->detect(im, keypoints);
// Draw detected blobs as red circles.
// DrawMatchesFlags::DRAW_RICH_KEYPOINTS flag ensures
// the size of the circle corresponds to the size of blob
Mat im_with_keypoints;
drawKeypoints(im, keypoints, im_with_keypoints, Scalar(0, 0, 255), DrawMatchesFlags::DRAW_RICH_KEYPOINTS);
// Show blobs
imshow("keypoints", im_with_keypoints);
waitKey(0);
return 0;
}