m_ahmadi's profile - activity

hi there

when i use findcontours function in vs2010, i get "access violation reading location... "error when i try to compile it, but when i compile same code in linux ubuntu it is run perfectly, is there any problem with opencv&vs2010?

here is the code:

#include "highgui.h"
#include "cv.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace cv;
using namespace std;
Mat src; Mat src_gray;
int thresh = 100;
int max_thresh = 255;
RNG rng(12345);
/// Function header
void thresh_callback(int, void* );
/** @function main */
int main(  )
{
/// Load source image and convert it to gray
src = imread( "lena.bmp",1 );
if ( src.empty() )
{
    cerr << "you owe me one!" << endl;
    return -1;
}
/// Convert image to gray and blur it
cvtColor( src, src_gray, CV_BGR2GRAY );
cvtColor( src, src_gray, CV_BGR2GRAY );
blur( src_gray, src_gray, Size(3,3) );
/// 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);
}
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, 2, 8, hierarchy, 0, Point() );
}
/// Show in a window
namedWindow( "Contours", CV_WINDOW_AUTOSIZE );
imshow( "Contours", drawing );
}

and the error is: Unhandled exception at 0x52b01f91 in test_test.exe: 0xC0000005: Access violation reading location 0x00000e1c.

the line that error occure:findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

project in Debug or Release mod, the error is still happening. and its nothing with finding image, check the code please.

image is load correctly, the problem is with findcontours.

#include "highgui.h"
#include "cv.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace cv;
using namespace std;
Mat src; Mat src_gray;
int thresh = 100;
int max_thresh = 255;
RNG rng(12345);
/// Function header
void thresh_callback(int, void* );
/** @function main */
int main( )
{
/// Load source image and convert it to gray
src = imread( "lena.bmp",1 );
if ( src.empty() )
{
    cerr << "you owe me one!" << endl;
    return -1;
}
namedWindow( "input_img", CV_WINDOW_AUTOSIZE );
imshow( "input_img", src );
waitKey(0);
/// Convert image to gray and blur it

//cvtColor( src, src_gray, CV_BGR2GRAY );
//
//blur( src_gray, src_gray, Size(3,3) );
///// 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);
}
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, 2, 8, hierarchy, 0 ...