opencv - OpenCV の過剰な 2 つの画像

Question

私はopencvを初めて使用し、検出された輪郭を単一のウィンドウで元の画像に重ねようとしましたが、うまくいきません。この 2 つの画像を 1 つのウィンドウに重ねることは可能ですか。もしそうなら、どのように？

 #include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace cv;
using namespace std;

Mat src; Mat src_gray;
int thresh = 20;
int max_thresh = 20;
RNG rng(12345);

// Function header
void thresh_callback(int, void* );

/** @function main */
 int main( int argc, char** argv )
{
  // Load source image and convert it to gray
  src = imread( "image18.jpg", 1 );

  // Convert image to gray and blur it
  cvtColor( src, src_gray, CV_BGR2GRAY );
   blur( src_gray, src_gray, Size(31,31) );

  // Create Window
   char* source_window = "Source";
  namedWindow( source_window, CV_WINDOW_AUTOSIZE );
  imshow( source_window, src );

   createTrackbar( " Canny thresh:", "Source", &thresh, max_thresh, thresh_callback );
   thresh_callback( 0, 0 );

   waitKey(0);
   return(0);
   }

/** @function thresh_callback */
void thresh_callback(int, void* )
{
  Mat canny_output;
  vector<vector<Point> > contours;
  vector<Vec4i> hierarchy;

  // 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_APPROX_SIMPLE, Point(0, 0) );

  // Draw contours
  Mat drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
  for( int i = 0; i< contours.size(); i++ )
     {
       Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
       drawContours( drawing, contours, i, color, 0.5, 1, hierarchy, 0, Point() );
      }

   // Show in a window
   namedWindow( "Contours", CV_WINDOW_AUTOSIZE );
   imshow( "Contours", drawing );
    }