double d=cv::norm<int,3,1>(cv::Vec3i(2,3,4));double calc_norm(int a,int b,int c)

#include <stdio.h>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/nonfree/nonfree.hpp"
#ifndef _DEBUG
#pragma  comment(lib,"IlmImf.lib")   
#pragma  comment(lib,"libjasper.lib")    
#pragma  comment(lib,"libjpeg.lib")   
#pragma  comment(lib,"libpng.lib")       
#pragma  comment(lib,"libtiff.lib")  
#pragma  comment(lib,"zlib.lib")   
#pragma  comment(lib,"opencv_calib3d2411.lib")
#pragma  comment(lib,"opencv_contrib2411.lib")
#pragma  comment(lib,"opencv_core2411.lib")
#pragma  comment(lib,"opencv_features2d2411.lib")
#pragma  comment(lib,"opencv_flann2411.lib")
#pragma  comment(lib,"opencv_gpu2411.lib")
#pragma  comment(lib,"opencv_highgui2411.lib")
#pragma  comment(lib,"opencv_imgproc2411.lib")
#pragma  comment(lib,"opencv_legacy2411.lib")
#pragma  comment(lib,"opencv_ml2411.lib")
#pragma  comment(lib,"opencv_nonfree2411.lib")
#pragma  comment(lib,"opencv_objdetect2411.lib")
#pragma  comment(lib,"opencv_ocl2411.lib")
#pragma  comment(lib,"opencv_photo2411.lib")
#pragma  comment(lib,"opencv_stitching2411.lib")
#pragma  comment(lib,"opencv_superres2411.lib")
#pragma  comment(lib,"opencv_ts2411.lib")
#pragma  comment(lib,"opencv_video2411.lib")
#pragma  comment(lib,"opencv_videostab2411.lib")
#else
#pragma  comment(lib,"zlibd.lib")
#pragma  comment(lib,"IlmImfd.lib")
#pragma  comment(lib,"libjasperd.lib")
#pragma  comment(lib,"libjpegd.lib")
#pragma  comment(lib,"libpngd.lib")
#pragma  comment(lib,"libtiffd.lib")
#pragma  comment(lib,"opencv_calib3d2411d.lib")
#pragma  comment(lib,"opencv_contrib2411d.lib")
#pragma  comment(lib,"opencv_core2411d.lib")
#pragma  comment(lib,"opencv_features2d2411d.lib")
#pragma  comment(lib,"opencv_flann2411d.lib")
#pragma  comment(lib,"opencv_gpu2411d.lib")
#pragma  comment(lib,"opencv_highgui2411d.lib")
#pragma  comment(lib,"opencv_imgproc2411d.lib")
#pragma  comment(lib,"opencv_legacy2411d.lib")
#pragma  comment(lib,"opencv_ml2411d.lib")
#pragma  comment(lib,"opencv_nonfree2411d.lib")
#pragma  comment(lib,"opencv_objdetect2411d.lib")
#pragma  comment(lib,"opencv_ocl2411d.lib")
#pragma  comment(lib,"opencv_photo2411d.lib")
#pragma  comment(lib,"opencv_stitching2411d.lib")
#pragma  comment(lib,"opencv_superres2411d.lib")
#pragma  comment(lib,"opencv_ts2411d.lib")
#pragma  comment(lib,"opencv_video2411d.lib")
#pragma  comment(lib,"opencv_videostab2411d.lib")
#endif




using namespace cv;


static void help()
{
    printf("\nThis program demonstrates using features2d detector, descriptor extractor and simple matcher\n"
            "Using the SURF desriptor:\n"
            "\n"
            "Usage:\n matcher_simple <image1> <image2>\n");
getchar();
}


int main0(int argc, char** argv)
{
    //////if(argc != 3)
    //////{
    //////    help();
    //////    return -1;
    //////}


    Mat img1 = imread(argv[1], CV_LOAD_IMAGE_GRAYSCALE);
    Mat img2 = imread(argv[2], CV_LOAD_IMAGE_GRAYSCALE);
    if(img1.empty() || img2.empty())
    {
        printf("Can't read one of the images\n");
        return -1;
    }


    // detecting keypoints
    SurfFeatureDetector detector(400);
    vector<KeyPoint> keypoints1, keypoints2;
    detector.detect(img1, keypoints1);
    detector.detect(img2, keypoints2);


    // computing descriptors
    SurfDescriptorExtractor extractor;
    Mat descriptors1, descriptors2;
    extractor.compute(img1, keypoints1, descriptors1);
    extractor.compute(img2, keypoints2, descriptors2);


    // matching descriptors
    BFMatcher matcher(NORM_L2);
    vector<DMatch> matches;
    matcher.match(descriptors1, descriptors2, matches);


    // drawing the results
    namedWindow("matches", 1);
    Mat img_matches;
    drawMatches(img1, keypoints1, img2, keypoints2, matches, img_matches);
    imshow("matches", img_matches);
    waitKey(0);


    return 0;
}
double calc_norm(int a,int b,int c)
{
double d=a*a+b*b+c*c;
d=sqrt(d);
return d;
}


int main(int argc, char** argv)
{ 
double d=cv::norm<int,3,1>(cv::Vec3i(2,3,4));
int i=static_cast<int>(d);
printf("d=%lf(%lf)\ni=%d\n",d,calc_norm(2,3,4),i);
return 0;
}


//d=5.385165(5.385165)
//i=5

//请按任意键继续. . .