opencv 마우스 이벤트와 빠르게 그리기

마우스 이벤트에서 마우스 위치를 저장하고

메인 루프에서 imshow와 rectangle을 이용해서

다시 그리게 하는데 영 느리길래.. 속도를 어떻게 하면 올릴수 있을까 고민중..

[링크 : http://answers.opencv.org/question/5163/how-to-use-callback-to-draw-a-rectangle-in-a-video/]

$ cat mousecb.cpp #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> using namespace std; using namespace cv; Point mpos(0,0); void CallBackFunc(int event, int x, int y, int flags, void* userdata) { cout << "pos (" << x << "," << y << ") "; mpos.x = x; mpos.y = y; switch(event) { case EVENT_MOUSEMOVE: cout << "EVENT_MOUSEMOVE" << endl; break; case EVENT_LBUTTONDOWN: cout << "EVENT_LBUTTONDOWN" << endl; break; case EVENT_LBUTTONUP: cout << "EVENT_LBUTTONUP" << endl; break; case EVENT_RBUTTONDOWN: cout << "EVENT_RBUTTONDOWN" << endl; break; case EVENT_RBUTTONUP: cout << "EVENT_RBUTTONUP" << endl; break; case EVENT_MBUTTONDOWN: cout << "EVENT_MBUTTONDOWN" << endl; break; case EVENT_MBUTTONUP: cout << "EVENT_MBUTTONUP" << endl; break; case EVENT_LBUTTONDBLCLK: cout << "EVENT_LBUTTONDBLCLK" << endl; break; case EVENT_RBUTTONDBLCLK: cout << "EVENT_RBUTTONDBLCLK" << endl; break; case EVENT_MBUTTONDBLCLK: cout << "EVENT_MBUTTONDBLCLK" << endl; break; /* case EVENT_MOUSEWHEEL: cout << "EVENT_MOUSEWHEEL" << endl; break; case EVENT_MOUSEHWHEEL: cout << "EVENT_MOUSEHWHEEL" << endl; break; */ } } int main(int argc, char** argv) { // Read image from file Mat img = imread("MyPic.JPG"); //if fail to read the image if ( img.empty() ) { cout << "Error loading the image" << endl; return -1; } //Create a window namedWindow("My Window", 1); //set the callback function for any mouse event setMouseCallback("My Window", CallBackFunc, NULL); //show the image imshow("My Window", img); for(;;) { rectangle(img, Point(mpos.x - 10, mpos.y - 10), Point(mpos.x + 10, mpos.y + 10), Scalar(0,0,0),2,8,0); imshow("My Window", img); // Wait until user press some key if(waitKey(30) >= 0) break; } return 0; }

+

CV_EXPORTS_W int waitKey(int delay = 0);

delay를 msec 단위로 주는거라.. 이녀석을 줄이면 좀 나아지긴 한다.

thread로 구분해서 하는 예제

[링크 : http://answers.opencv.org/.../waitkey1-timing-issues-causing-frame-rate-slow-down-fix/]