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#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/features2d.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int main()
{
//! [Algorithm]
Ptr<Feature2D> sbd = SimpleBlobDetector::create();
FileStorage fs_read("SimpleBlobDetector_params.xml", FileStorage::READ);
if (fs_read.isOpened()) // if we have file with parameters, read them
{
sbd->read(fs_read.root());
fs_read.release();
}
else // else modify the parameters and store them; user can later edit the file to use different parameters
{
fs_read.release();
FileStorage fs_write("SimpleBlobDetector_params.xml", FileStorage::WRITE);
sbd->write(fs_write);
fs_write.release();
}
Mat result, image = imread("../data/detect_blob.png", IMREAD_COLOR);
vector<KeyPoint> keypoints;
sbd->detect(image, keypoints, Mat());
drawKeypoints(image, keypoints, result);
for (vector<KeyPoint>::iterator k = keypoints.begin(); k != keypoints.end(); ++k)
circle(result, k->pt, (int)k->size, Scalar(0, 0, 255), 2);
imshow("result", result);
waitKey(0);
//! [Algorithm]
const char * vertex_names[4] {"0", "1", "2", "3"};
//! [RotatedRect_demo]
Mat test_image(200, 200, CV_8UC3, Scalar(0));
RotatedRect rRect = RotatedRect(Point2f(100,100), Size2f(100,50), 30);
Point2f vertices[4];
rRect.points(vertices);
for (int i = 0; i < 4; i++)
{
line(test_image, vertices[i], vertices[(i+1)%4], Scalar(0,255,0), 2);
putText(test_image, vertex_names[i], vertices[i], FONT_HERSHEY_SIMPLEX, 1, Scalar(255,255,255));
}
Rect brect = rRect.boundingRect();
rectangle(test_image, brect, Scalar(255,0,0), 2);
imshow("rectangles", test_image);
waitKey(0);
//! [RotatedRect_demo]
{
//! [TickMeter_total]
TickMeter tm;
tm.start();
// do something ...
tm.stop();
cout << "Total time: " << tm.getTimeSec() << endl;
//! [TickMeter_total]
}
{
const int COUNT = 100;
//! [TickMeter_average]
TickMeter tm;
for (int i = 0; i < COUNT; i++)
{
tm.start();
// do something ...
tm.stop();
}
cout << "Average time per iteration in seconds: " << tm.getAvgTimeSec() << endl;
cout << "Average FPS: " << tm.getFPS() << endl;
//! [TickMeter_average]
}
return 0;
}
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