拉普拉斯变换 （有问题）

#include<cv.h>
#include<highgui.h>
#include<iostream>
#include<opencv2/opencv.hpp>

using namespace std;

int main()

{
IplImage * src, *dst ;


src = cvLoadImage("D:\\123\\2\\3.jpg",1);
dst = cvCreateImage(cvGetSize(src),IPL_DEPTH_8U,1) ;


cvNamedWindow("src",CV_WINDOW_AUTOSIZE) ;
cvShowImage("src",src);


cvNamedWindow("Laplace",CV_WINDOW_AUTOSIZE) ;
cvLaplace(src,dst,3) ;
cvShowImage("Laplace",dst);


cvWaitKey(0) ;


cvReleaseImage(&src);
cvReleaseImage(&dst);
cvDestroyWindow("src");
    cvDestroyWindow("Laplace");


return 0;


}