#include <iostream>
#include <vector> 
#include <opencv2/opencv.hpp>
#include <opencv2/highgui.hpp>
using namespace std;
using namespace cv;

int main() {
    Mat img = imread("resources/dog.jpg",IMREAD_GRAYSCALE);
    Mat dest;
    threshold(img,dest,30,30,THRESH_TOZERO);
    imshow("dest",dest);
    waitKey();
    return 0;
}