How to fill Matrix with zeros in OpenCV?

Question

The code below causes an exception. Why?

#include 
#include 

using namespace cv;
using namespace std;

void mai         


        

Answer 1

Mat img;

img=Mat::zeros(size of image,CV_8UC3);

if you want it to be of an image img1

img=Mat::zeros(img1.size,CV_8UC3);