《OpenCV：鼠標操作（繪製直線、矩形、圓）簡單示例》

  #include<opencv2/opencv.hpp> #include<iostream> void on_mouse(int event, int x, int y, int flags, void* ustc); void drawRectangle(cv::Mat src, cv::Point pt1, cv::Point pt2); void drawCircle(cv::Mat

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