opencv:canny边缘检测

#include "StdAfx.h"
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
int main( int argc, char** argv )
{
//声明IplImage指针
IplImage* img = NULL;
IplImage* cannyImg = NULL;
char *filename;
filename="lena.png";
img=cvLoadImage(filename,1);
//载入图像，强制转化为Gray
if((img = cvLoadImage(filename, 0)) != 0 )
{
//为canny边缘图像申请空间
cannyImg = cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);
//canny边缘检测
cvCanny(img, cannyImg, 50, 150, 3);
//创建窗口
cvNamedWindow("src", 1);
cvNamedWindow("canny",1);
//显示图像
cvShowImage( "src", img );
cvShowImage( "canny", cannyImg );
cvWaitKey(0); //等待按键
//销毁窗口
cvDestroyWindow( "src" );
cvDestroyWindow( "canny" );
//释放图像
cvReleaseImage( &img );
cvReleaseImage( &cannyImg );
return 0;
}
return -1;
}