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samples/gpu/matcher_simple.cpp

-#include <iostream>
-
-#include <opencv2/core/core.hpp>
-#include <opencv2/features2d/features2d.hpp>
-#include <opencv2/highgui/highgui.hpp>
-#include <opencv2/gpu/gpu.hpp>
-
-using namespace std;
-using namespace cv;
-using namespace cv::gpu;
-
-void help()
-{
-    cout << "\nThis program demonstrates using SURF_GPU features detector, descriptor extractor and BruteForceMatcher_GPU" << endl;
-    cout << "\nUsage:\n\tmatcher_simple_gpu <image1> <image2>" << endl;
-}
-
-int main(int argc, char* argv[])
-{
-    if (argc != 3)
-    {
-        help();
-        return -1;
-    }
-
-    GpuMat img1(imread(argv[1], CV_LOAD_IMAGE_GRAYSCALE));
-    GpuMat img2(imread(argv[2], CV_LOAD_IMAGE_GRAYSCALE));
-    if (img1.empty() || img2.empty())
-    {
-        cout << "Can't read one of the images" << endl;
-        return -1;
-    }
-
-    SURF_GPU surf;
-
-    // detecting keypoints & computing descriptors
-    GpuMat keypoints1GPU, keypoints2GPU;
-    GpuMat descriptors1GPU, descriptors2GPU;
-    surf(img1, GpuMat(), keypoints1GPU, descriptors1GPU);
-    surf(img2, GpuMat(), keypoints2GPU, descriptors2GPU);
-
-    // matching descriptors
-    BruteForceMatcher_GPU< L2<float> > matcher;
-    GpuMat trainIdx, distance;
-    matcher.matchSingle(descriptors1GPU, descriptors2GPU, trainIdx, distance);
-    
-    // downloading results
-    vector<KeyPoint> keypoints1, keypoints2;
-    vector<float> descriptors1, descriptors2;
-    vector<DMatch> matches;
-    SURF_GPU::downloadKeypoints(keypoints1GPU, keypoints1);
-    SURF_GPU::downloadKeypoints(keypoints2GPU, keypoints2);
-    SURF_GPU::downloadDescriptors(descriptors1GPU, descriptors1);
-    SURF_GPU::downloadDescriptors(descriptors2GPU, descriptors2);
-    BruteForceMatcher_GPU< L2<float> >::matchDownload(trainIdx, distance, matches);
-
-    // drawing the results
-    Mat img_matches;
-    drawMatches(img1, keypoints1, img2, keypoints2, matches, img_matches);
-    imshow("matches", img_matches);
-    waitKey(0);
-
-    return 0;
-}