access_to_pixel_by_oepncv.cpp

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

using namespace cv;
using namespace std;

int main(){
    Mat sourceImg =imread("/Users/clsrn1581/Desktop/sample.png", CV_LOAD_IMAGE_GRAYSCALE);
    
    for(int y = 0 ;y < sourceImg.rows; y++){
        for(int x = 0; x < sourceImg.cols; x++){
            printf("%3d ", (int)sourceImg.at<unsigned char>(y,x));
        }
        printf("\n");
    }
    return 0;
}