c++ - OpenCV Display Pixels Value -

i have below code. when run program, unknown characters instead of pixel values comes screen. want display pixel values. how do this? thank you.

#include <opencv2/opencv.hpp> #include <opencv2/highgui.hpp> #include <opencv2/highgui/highgui.hpp> #include <iostream>  using namespace cv; using namespace std;  int main() {     mat image = imread("/home/fd/baby.jpg");     for( int = 0 ; < image.rows ; i++)     {         for( int j = 0 ; j < image.cols ; j++ )         {             if(image.type() == cv_8uc1)             {                 image.at<uchar>(i,j) = 255;             }             else if(image.type() == cv_8uc3)             {                 cout << image.at<vec3b>(i,j)[0] << " " << image.at<vec3b>(i,j)[1] << " " << image.at<vec3b>(i,j)[2] << endl;                  image.at<vec3b>(i,j)[0] = 255;                 image.at<vec3b>(i,j)[1] = 255;                 image.at<vec3b>(i,j)[2] = 255;                  cout << image.at<vec3b>(i,j)[0] << " " << image.at<vec3b>(i,j)[1] << " " << image.at<vec3b>(i,j)[2] << endl;             }             else             {                 cout << "anknown image format" << endl;                 return 0;             }         }     }     imshow("result İmage", image);     waitkey(0); } 

this result screen:

cast each of outputs integer

<< image.at<vec3b>(i,j)[0] ... 

change to

<< (int)image.at<vec3b>(i,j)[0] ... 

you printing char (or unsigned char) printed through stream single character (which @ 255 looks see). cast int forces display numerical representation of value.

the other answers changing image.at<type> changes how raw data interpreted; don't that. must interpreted properly.