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[求助] opencv创建(腐蚀膨胀)滑动条,总是在调用函数时报错,望大家帮忙看看,谢谢解答

#include<opencv2\opencv.hpp>
#include<opencv2\highgui\highgui.hpp>
using namespace cv;
using namespace std;

void on_erode(int,void*);
void on_dilate(int,void*);
Mat srcImage,erodeImage,dilateImage;
Mat Elment;
int a=3;

int main()
{
       
        srcImage=imread("1.jpg";
        namedWindow("膨胀";
        namedWindow("腐蚀";
       
       
        createTrackbar("n_erode","腐蚀",&a,10,on_erode);
        createTrackbar("n_dilate","膨胀",&a,10,on_dilate);
        on_erode(a,0);
        on_dilate(a,0);

        waitKey(0);
       
       

}
void on_erode(int,void*)
{
        Elment=getStructuringElement(MORPH_RECT,Size(a,a));
        erode(srcImage,erodeImage,Elment);
        imshow("腐蚀",erodeImage);
       
}
void on_dilate(int,void*)
{
        Elment=getStructuringElement(MORPH_RECT,Size(a,a),Point(a,a));
        dilate(srcImage,dilateImage,Elment);
}
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