How I can transform image to black and white (0 or 1) ?

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C

Visual-Studio

OpenCV

I using visual studio 2010 and open CV library , in C language
my question is how I ca transform image pgm to pbm for example after put like *file and read the image only in binary 0 or 1 ?
thnk u

What I have tried:

this to convert image to greyscale
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "iostream"

using namespace cv;
using namespace std;

int main( )
{

Mat image;
image = imread("lena.jpg", CV_LOAD_IMAGE_COLOR);

if(! image.data )
{
cout << "Could not open or find the image" << std::endl ;
return -1;
}

// Create a new matrix to hold the gray image
Mat gray;

// convert RGB image to gray
cvtColor(image, gray, CV_BGR2GRAY);

namedWindow( "Display window", CV_WINDOW_AUTOSIZE );
imshow( "Display window", image );

namedWindow( "Result window", CV_WINDOW_AUTOSIZE );
imshow( "Result window", gray );

waitKey(0);
return 0;
}