对称变换

#include <opencv\cv.h>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
using namespace cv ;
using namespace std ;
int main()
{
    Mat now ,result;
    now=imread("girl.jpg") ;
    if(now.empty())
        return -1 ;
    //printf("%d  %d\n",now.cols ,now.rows) ;
    imshow("mygirl",now) ;
    waitKey(0) ;
    int N=now.rows ;
    int M=now.cols ;
    result.create(N,M,now.type()) ;
    for(int i=0;i<N;i++)
        for(int j=0;j<M;j++){
            result.at<Vec3b>(i,j)[0]=now.at<Vec3b>(i,M-1-j)[0] ;
            result.at<Vec3b>(i,j)[1]=now.at<Vec3b>(i,M-1-j)[1] ;
            result.at<Vec3b>(i,j)[2]=now.at<Vec3b>(i,M-1-j)[2] ;
    }
    imshow("girl2",result) ;
    imwrite("girl2.jpg",result) ;
    waitKey(0) ;
    return 0;
}