CODEWITHSUNDEEP
c++opencvmat
user2351428
user2351428

Reputation: 111

How to inialize and access the entries in Mat scalars matrix in openCV using C++ interface?

I am trying to do some basic algebraic operations on matrices. I would like to use the class Mat from openCV. I used the following simple code which wouldn't work:

void main()
{
  float data[2][5] = {{1,2,3,4,5},{7,8,9,10,11}}; 
  Mat H = Mat(2, 5, CV_8UC1, data); 
  cout << H.at<float>(0,0);
  //OR:
  cout << H;
}

Now I have already encountered a similar problem in loading an image by the imread function. I've overcomed it by starting from C and then pass to C++:

IplImage* Csrc = cvLoadImage("D:/picture.jpg");
Mat src(Csrc);

which did work. Could anyone help with the scalars matrices? How could I print the entries for example ? Thank you.

Upvotes: 0

Views: 212

Answers (1)

Saikat
Saikat

Reputation: 1219

Main problem of your code is that data[2][5] is a float matrix and H is a matrix of unsined character.

Declare the matrix H as -

Mat H=Mat(2,5,CV_32FC1,data);

Your second problem is very simple

To read a image as a cvMat object and display it, just do -

Mat M = imread("/home/Pictures/image.png",1);
imshow("IMAGE",M);
waitKey(0);

Upvotes: 1

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