1 #include<opencv2\opencv.hpp>
 2 #include <iostream>
 3 using namespace cv;
 4 using namespace std;
 5 int main()
 6 {
 7 
 8     //int threshval = 100;
 9     Mat img = imread("33.jpg");
10     img = img >230;
11     namedWindow("Img", 1);
12     imshow("Img", img);
13     waitKey(0);
14     return 0;
15 }