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debug assertion failed vc\include\vector vector iterator + offset out of range in chamferMatching Opencv

asked 2013-10-04 08:33:42 -0600

prakashjoshi gravatar image

updated 2013-10-05 01:13:16 -0600

I am stuck with the problem while implementing chamfer matching program in OpenCV

Following is the code it is reading template image

and test image

, I am using VS 2008 and OpenCV2.4.6

#include "stdafx.h"
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/contrib/contrib.hpp>
#include <iostream>
using namespace cv;
using namespace std;

int main( int argc, char** argv )
IplImage *src;
src = cvLoadImage("C:\\Users\\JOSHI\\Desktop\\Images\\logo_in_clutter.png",1);      
Mat img=cvarrToMat(src);  

src = cvLoadImage("C:\\Users\\JOSHI\\Desktop\\Images\\logo.png",1);  
Mat tpl=cvarrToMat(src);  
Mat cimg;

// if the image and the template are not edge maps but normal grayscale images,
// you might want to uncomment the lines below to produce the maps. You can also
// run Sobel instead of Canny.    
 Canny(img, img, 5, 50, 3);
 Canny(tpl, tpl, 5, 50, 3);    
vector<vector<Point> > results;
vector<float> costs;
int best = chamerMatching( img, tpl, results, costs );
if( best < 0 )
    cout << "not found;\n";
    return 0;
size_t i, n = results[best].size();
for( i = 0; i < n; i++ )
    Point pt = results[best][i];
    if( pt.inside(Rect(0, 0, cimg.cols, cimg.rows)) )<Vec3b>(pt) = Vec3b(0, 255, 0);
imshow("result", cimg);

return 0;

this is the error image

can you suggest me why I am getting this error as I am new to OpenCV and Image Processing

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answered 2013-10-05 06:12:04 -0600

Guanta gravatar image

I guess the reason is that you load your images as color images, not as grayscale. I also suggest you to use the newer C++ interface (i.e. imread instead of loadImage) as also used in the example, see also

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Hi Guanta, Can you look into ? I hit this issue with OpenCV 2.4.9 with the sample program: chamfer.cpp. I also used logo_in_clutter.png and logo.png.

unixer gravatar imageunixer ( 2014-07-20 08:28:32 -0600 )edit

ping... please help me..

unixer gravatar imageunixer ( 2014-07-21 03:06:14 -0600 )edit

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Asked: 2013-10-04 08:33:42 -0600

Seen: 1,973 times

Last updated: Oct 05 '13