opencv切割图片并用帧差法比较

#include "cv.h"
#include "highgui.h"

int main()
{
 IplImage* img0=cvLoadImage("E:\\导出图片\\10000f.bmp");
 IplImage* img1=cvLoadImage("E:\\导出图片\\11020f.bmp");

 CvMat* Mat0 = NULL;
 CvMat* Mat1 = NULL;

 CvRect rect0,rect1;
 rect0.x=0;
 rect0.y=400;
 rect0.height=300;
 rect0.width=200;

 rect1.x=0;
 rect1.y=400;
 rect1.height=300;
 rect1.width=200;

 cvSetImageROI( img0, rect0 );
 cvSetImageROI( img0, rect1 );

 

 cvNamedWindow( "tem image" );
 cvShowImage("tem image",img0);///显示pImg大小为48*48
 cvNamedWindow( "tem image1" );
 cvShowImage("tem image1",img1);///显示pImg大小为48*48
 
 IplImage *selimg0=cvCreateImage(cvSize(rect0.width,rect0.height),IPL_DEPTH_8U,1);
 selimg0=(IplImage*)cvClone(img0);
 IplImage *selimg1=cvCreateImage(cvSize(rect1.width,rect1.height),IPL_DEPTH_8U,1);
 selimg1=(IplImage*)cvClone(img1);

 Mat0 = cvCreateMat(selimg0->height, selimg0->width, CV_32FC1);
 Mat1 = cvCreateMat(selimg1->height, selimg1->width, CV_32FC1);
 
 cvCvtColor(img0, selimg0, CV_BGR2GRAY);  
 cvConvert(selimg0, Mat0);//图像转为矩阵

 cvCvtColor(img1, selimg1, CV_BGR2GRAY);  
 cvConvert(selimg1, Mat1);//图像转为矩阵

 double t = cvNorm(Mat0,Mat1,CV_RELATIVE_L2,NULL);
 

 //cvNamedWindow( "select pImage");//可以看到selimg->width,selimg->height还是原图大小
 //cvShowImage("select pImage",selimg);///显示pImg大小为48*48
// cvSaveImage("hello2.jpg",selimg);
 cvResetImageROI(img0);
 cvResetImageROI(img1);
 printf("%d\n",t);
 system("PAUSE");
 cvWaitKey(0);
 return 0;
}