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通过鼠标回调,实现一个简单功能:
鼠标左键点击图片任何一点,显示该点坐标及像数值。
代码如下:
#include <opencv2/opencv.hpp>
#include <iostream>
//鼠标回调
void onMouse(int event,int x,int y,int flags,void* param)
{
cv::Mat* im = reinterpret_cast<cv::Mat*>(param);
switch (event) { //调度事件
case CV_EVENT_LBUTTONDOWN: //鼠标左键按下
//显示像数值(x,y)
std::cout << "at (" << x << "," << y << ") pixel value is: "
<< static_cast<int>(im->at<uchar>(cv::Point(x,y))) << std::endl;
break;
}
}
int main(int argc, char** argv) {
cv::Mat src, dst;
src = cv::imread("D:/VS2015_Projects/opencv_workspace/img/opencvtest.jpg");
if(src.empty())
{
std::cout << "image load failed!" << std::endl;
return -1;
}
imshow("input image", src);
//注册鼠标回调函数
cv::setMouseCallback("input image", onMouse, reinterpret_cast<void*>(&src));
cv::waitKey(0);
return 0;
}
效果如下: