Hough lines tansform opencv program breaks - memory

Question

I am trying to use houghlines transform. The function is working well but program breaks after imshow("detected lines",cdst) somewhere in free.c file in free_base function.
please help me out
Here is my code:
#include<opencv\cv.h>
#include<opencv/cxcore.h>
#include<opencv/highgui.h>
#include<opencv2\imgproc\imgproc.hpp>
#include<iostream>
#include<vector>
#include<math.h>
#include <string>
using namespace cv;
using namespace std;
void help()
{
cout << "\nThis program demonstrates line finding with the Hough transform.\n"
"Usage:\n"
"./houghlines <image_name>, Default is pic1.jpg\n" << endl;
}
int houghline(String filename)
{
//const char* filename = argc >= 2 ? argv[1] : "Release\\D.bmp.bmp";
Mat src = imread(filename, 0);
if(src.empty())
{
help();
cout << "can not open " << filename << endl;
return -1;
}
Mat dst, cdst;
Canny(src, dst, 50, 200, 3);
cvtColor(dst, cdst, CV_GRAY2BGR);
/*
vector<Vec2f> lines;
HoughLines(dst, lines, 1, CV_PI/180, 100, 0, 0 );
float aaa=lines[1][0];
for( size_t i = 0; i < lines.size(); i++ )
{
float rho = lines[i][0], theta = lines[i][1];
Point pt1, pt2;
double a = cos(theta), b = sin(theta);
double x0 = a*rho, y0 = b*rho;
pt1.x = cvRound(x0 + 1000*(-b));
pt1.y = cvRound(y0 + 1000*(a));
pt2.x = cvRound(x0 - 1000*(-b));
pt2.y = cvRound(y0 - 1000*(a));
line( cdst, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
}
*/
vector<Vec4i> lines;
HoughLinesP(dst, lines, 1, CV_PI/180, 10, 25, 2 );
/*
with the arguments:
dst: Output of the edge detector. It should be a grayscale image (although in fact it is a binary one)
lines: A vector that will store the parameters (x_{start}, y_{start}, x_{end}, y_{end}) of the detected lines
rho : The resolution of the parameter r in pixels. We use 1 pixel.
theta: The resolution of the parameter \theta in radians. We use 1 degree (CV_PI/180)
threshold: The minimum number of intersections to “detect” a line
minLinLength: The minimum number of points that can form a line. Lines with less than this number of points are disregarded.
maxLineGap: The maximum gap between two points to be considered in the same line
*/
for( size_t i = 0; i < lines.size(); i++ )
{
Vec4i l = lines[i];
line( cdst, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(255,0,0), 1, CV_AA);
imshow("detected lines", cdst);
waitKey();
}
imshow("source", src);
imshow("detected lines", cdst);
}
int main(int argc, char** argv)
{
//for(char alpha='A';alpha<='Z';alpha++)
//String filename="C:\\Users\\Abhinav\\Documents\\Visual Studio 2012\\Projects\\Classes\\Release\\Microsoft Sans Serif\\"+to_string(alpha)+".bmp";
try{houghline("C:\\Users\\Abhinav\\Documents\\Visual Studio 2012\\Projects\\Classes\\Release\\Microsoft Sans Serif\\A.bmp");}
//houghline("C:\\Users\\Abhinav\\Documents\\Visual Studio 2012\\Projects\\Classes\\Release\\Microsoft Sans Serif\\B.bmp");
catch(Exception e){cout<<e.err;}
waitKey();
return 0;
}

Answer 1

It seems that your function "int houghline(String filename)" has no return statement.
Please add "return 0;" at the end of the function and see if it works.