如何在 C++ 中使用 OpenCV 處理滑鼠事件?


滑鼠事件是 OpenCV 中最實用的功能之一。在 OpenCV 中,我們可以追蹤滑鼠指標的位置以及點選(右鍵、左鍵和中鍵)。OpenCV 在機器人學和計算機視覺中有著廣泛的應用。在機器人學和計算機視覺中,追蹤滑鼠指標和點選被廣泛使用。

本文將瞭解如何在影像上追蹤滑鼠指標的位置和點選。

以下程式展示瞭如何追蹤滑鼠指標的位置和點選。

示例

#include<iostream>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
void locator(int event, int x, int y, int flags, void* userdata){ //function to track mouse movement and click//
   if (event == EVENT_LBUTTONDOWN){ //when left button clicked//
      cout << "Left click has been made, Position:(" << x << "," << y << ")" << endl;
   } else if (event == EVENT_RBUTTONDOWN){ //when right button clicked//
      cout << "Rightclick has been made, Position:(" << x << "," << y << ")" << endl;
   } else if (event == EVENT_MBUTTONDOWN){ //when middle button clicked//
      cout << "Middleclick has been made, Position:(" << x << "," << y << ")" << endl;
   } else if (event == EVENT_MOUSEMOVE){ //when mouse pointer moves//
      cout << "Current mouse position:(" << x << "," << y << ")" << endl;
   }
}
int main() {
   Mat image = imread("bright.jpg");//loading image in the matrix//
   namedWindow("Track");//declaring window to show image//
   setMouseCallback("Track", locator, NULL);//Mouse callback function on define window//
   imshow("Track", image);//showing image on the window//
   waitKey(0);//wait for keystroke//
   return 0;
}

輸出

更新於: 10-Mar-2021

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