Print out the values of a (Mat) matrix in OpenCV C++

http://stackoverflow.com/questions/7970988/print-out-the-values-of-a-mat-matrix-in-opencv-c

 

I want to dump the values of a matrix in OpenCV to the console using cout. I quickly learned that I do not understand OpenvCV's type system nor C++ templates well enough to accomplish this simple task.

Would a reader please post (or point me to) a little function or code snippet that prints a Mat?

Regards, Aaron

PS: Code that uses the newer C++ Mat interface as opposed to the older CvMat interface is preferential.

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See the first answer to Accesing a matrix element in the "Mat" object (not the CvMat object) in OpenCV C++
Then just loop over all the elements in cout << M.at<double>(0,0); rather than just 0,0

Or better still with the new C++ interface (thanks to SSteve)

cv::Mat M;

cout << "M = "<< endl << " "  << M << endl << endl;

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#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <iostream>
#include <iomanip>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    double data[4] = {-0.0000000077898273846583732, -0.03749374753019832, -0.0374787251930463, -0.000000000077893623846343843};
    Mat src = Mat(1, 4, CV_64F, &data);
    for(int i=0; i<4; i++)
        cout << setprecision(3) << src.at<double>(0,i) << endl;

    return 0;
}

 

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