c – 在OpenCV中是否有类似MATLAB的’impixelinfo()’功能？

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;

Mat img;

void
CallBackFunc(int event,int x,int y,int flags,void* userdata)
{
   if(event==EVENT_MOUSEMOVE){
      cout << "Pixel (" << x << "," << y << "): " << img.at<Vec3b>(y,x) << endl;
   }
}

int main()
{
   // Read image from file 
   img=imread("demo.jpg");

   // Check it loaded
   if(img.empty()) 
   { 
      cout << "Error loading the image" << endl;
      exit(1);
   }

   //Create a window
   namedWindow("ImageDisplay",1);

   // Register a mouse callback
   setMouseCallback("ImageDisplay",CallBackFunc,nullptr);

   // Main loop
   while(true){
      imshow("ImageDisplay",img);
      waitKey(50);
   }
}

作为有用的评论的结果,我(希望)改进了代码并且现在处理灰度图像,并且还将RGB排序设置为更类似于非OpenCV爱好者可能期望的 – 即RGB而不是BGR.更新的功能如下：

void
CallBackFunc(int event,void* userdata)
{
   if(event==EVENT_MOUSEMOVE){
      // Test if greyscale or color
      if(img.channels()==1){
         cout << "Grey Pixel (" << x << "," << y << "): " << (int)img.at<uchar>(y,x) << endl;
      } else {
         cout << "RGB Pixel (" << x << "," << y << "): " << (int)img.at<Vec3b>(y,x)[2] << "/" << (int)img.at<Vec3b>(y,x)[1] << "/" << (int)img.at<Vec3b>(y,x)[0] << endl;
      }
   }
}