刚刚接触opencv，将图像阈值化之后取轮廓总是发生中断，显示
代码如下：
#include <iostream>
#include<stdio.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
Mat src, src_gray, dst, result, dst_open, dst_open_gray;
int thresh;
int ElementSize = 3;
void Process();
void ElementSizeChange(int, void *);
int Otsu(Mat&image);
int main()
{
src = imread("1.jpg");
//检查图片是否读入
if (!src.data)
{
cout << "读取图片错误！" << endl;
return false;
}
namedWindow("原图");
imshow("原图", src);
//转换为灰度图
cvtColor(src, src_gray, COLOR_RGB2GRAY);
thresh = Otsu(src_gray);
printf("\n\n\n\n\n由最大类间方差得到的最佳阈值为：%d\n\n\n\n\n", thresh);
threshold(src_gray, dst, thresh, 255, THRESH_BINARY);
namedWindow("Otsu效果图");
imshow("Otsu效果图", dst);
//开运算
Mat element = getStructuringElement(MORPH_RECT, Size(2 * ElementSize + 1, 2 * ElementSize + 1), Point(ElementSize, ElementSize));
erode(dst, result, element);
dilate(result, dst_open, element);
namedWindow("开运算效果");
imshow("开运算效果", dst_open);
//创建轨迹条
createTrackbar("内核尺寸", "开运算效果", &ElementSize, 21, ElementSizeChange);
//寻找轮廓、绘制轮廓
RNG rng(12345);
vector<vector<Point>>contours;
vector<Vec4i>hierarchy;
findContours(dst_open_gray, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0));
Mat dst_contours = Mat::zeros(dst_open_gray.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(dst_contours, contours, i, color, 2, 8, hierarchy, 0, Point());
}
imshow("轮廓图", dst_contours);
waitKey(0);
return 0;
}
运行红色代码时就会中断，显示上图的错误，纠结了很久，求问大神们应该怎么改？
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这就是完整代码吗
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？我帮你调试
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dst_open_gray根本没赋值，为空。不崩溃才怪
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崩溃的时候在弹出的对话框按相应按钮进入调试，按Alt+7键查看Call Stack即“调用堆栈”里面从上到下列出的对应从里层到外层的函数调用历史。双击某一行可将光标定位到此次调用的源代码或汇编指令处，看不懂时双击下一行，直到能看懂为止。