opencv 3.0 findContours函数在窗口中不起作用

我使用的是visual studio 15，在opencv 3.0中工作，我的代码中出现了访问违规错误，甚至这个函数也不能使用opencv中给出的示例代码。

#include"stdafx.h"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <math.h>
#include <iostream>
using namespace cv;
using namespace std;
static void help()
{
    cout
        << "nThis program illustrates the use of findContours and drawContoursn"
        << "The original image is put up along with the image of drawn contoursn"
        << "Usage:n"
        << "./contours2n"
        << "nA trackbar is put up which controls the contour level from -3 to 3n"
        << endl;
}
const int w = 500;
int levels = 3;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;
static void on_trackbar(int, void*)
{
    Mat cnt_img = Mat::zeros(w, w, CV_8UC3);
    int _levels = levels - 3;
    drawContours(cnt_img, contours, _levels <= 0 ? 3 : -1, Scalar(128, 255, 255),
        3, LINE_AA, hierarchy, std::abs(_levels));
    imshow("contours", cnt_img);
}
int main(int argc, char**)
{
    Mat img = Mat::zeros(w, w, CV_8UC1);
    if (argc > 1)
    {
        help();
        return -1;
    }
    //Draw 6 faces
    for (int i = 0; i < 6; i++)
    {
        int dx = (i % 2) * 250 - 30;
        int dy = (i / 2) * 150;
        const Scalar white = Scalar(255);
        const Scalar black = Scalar(0);
        if (i == 0)
        {
            for (int j = 0; j <= 10; j++)
            {
                double angle = (j + 5)*CV_PI / 21;
                line(img, Point(cvRound(dx + 100 + j * 10 - 80 * cos(angle)),
                    cvRound(dy + 100 - 90 * sin(angle))),
                    Point(cvRound(dx + 100 + j * 10 - 30 * cos(angle)),
                        cvRound(dy + 100 - 30 * sin(angle))), white, 1, 8, 0);
            }
        }
        ellipse(img, Point(dx + 150, dy + 100), Size(100, 70), 0, 0, 360, white, -1, 8, 0);
        ellipse(img, Point(dx + 115, dy + 70), Size(30, 20), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 185, dy + 70), Size(30, 20), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 115, dy + 70), Size(15, 15), 0, 0, 360, white, -1, 8, 0);
        ellipse(img, Point(dx + 185, dy + 70), Size(15, 15), 0, 0, 360, white, -1, 8, 0);
        ellipse(img, Point(dx + 115, dy + 70), Size(5, 5), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 185, dy + 70), Size(5, 5), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 150, dy + 100), Size(10, 5), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 150, dy + 150), Size(40, 10), 0, 0, 360, black, -1, 8, 0);
        ellipse(img, Point(dx + 27, dy + 100), Size(20, 35), 0, 0, 360, white, -1, 8, 0);
        ellipse(img, Point(dx + 273, dy + 100), Size(20, 35), 0, 0, 360, white, -1, 8, 0);
    }
    //show the faces
    namedWindow("image", 1);
    imshow("image", img);
    //Extract the contours so that
    //vector<vector<Point> > contours0;
    vector<cv::Mat> coutours;
    findContours(img, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);
    contours.resize(contours.size());
    for (size_t k = 0; k < contours.size(); k++)
        approxPolyDP(Mat(contours[k]), contours[k], 3, true);
    namedWindow("contours", 1);
    createTrackbar("levels+3", "contours", &levels, 7, on_trackbar);
    on_trackbar(0, 0);
    waitKey();
    return 0;
}

我使用x64体系结构，并链接了所有库.lib和d.lib（调试库）。