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I am trying to extract contour from gray label image. My interest is I want to access/show numerical value of chain code. How can I do this? Here is my code segment.

int main(..)
{
  Mat src_gray;
  //read src_gray;
  Mat canny_output;
  vector<vector<Point> > contours;
  vector<Vec4i> hierarchy;
  int thresh=100; 

  /// Detect edges using canny
  Canny( src_gray, canny_output, thresh, thresh*2, 3 );
  /// Find contours
  findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_CODE, Point(0, 0) );

  ///Want to see chain code of contour here/How to access chain code value?

}

I am trying to extract contour from gray label image. My interest is I want to access/show numerical value of chain code. How can I do this? Here is my code segment.

int main(..)
{
  Mat src_gray;
  //read src_gray;
  Mat canny_output;
  vector<vector<Point> > contours;
  vector<Vec4i> hierarchy;
  int thresh=100; 

  /// Detect edges using canny
  Canny( src_gray, canny_output, thresh, thresh*2, 3 );
  /// Find contours
  findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_CODE, Point(0, 0) );

  ///Want to see chain code of contour here/How to access chain code value?

}