C++ OpenCV cv::trace()














































C++ OpenCV cv::trace()




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Description::
This is a C++ program to show the use of trace funtion which is inbuilt in the opencv library. Trace function takes 1 parameter. Parameter is mat object for image.This function returns the sum of diagonal elements of matrix
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Program::

#include <opencv2/opencv.hpp>
using namespace cv;
#include <iostream>
using namespace std;

int main( int argc, char** argv )
{
  char* imageName = argv[1];         //image file
  Mat image; //mat object for storing data
  image = imread( imageName, IMREAD_COLOR );          //read file
  if( argc != 2 || !image.data )
  {
    printf( " No image data \n " );
    return -1;
  }
Scalar obj;
obj=trace(image);      
cout<<obj<<endl;
namedWindow( imageName, WINDOW_NORMAL );
  imshow( imageName, image );         //show window containing images
waitKey(0);       //to exit
return 0;
} 

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Commands to run program on terminal::
g++ -ggdb `pkg-config --cflags filename` -o `basename filename .cpp` filename `pkg-config --libs opencv`

$ ./cvopen filename
---------------------------------------------------------------------------------------------------------------
Output::

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