csp256's profile - activity

I get this same error when my webcam crashes and stops supplying video. Are you certain that you are getting good data from your avi file?

It was really that simple. Please resubmit as answer.

I just compiled OpenCV 3.1.0 from source on Ubuntu 15.10. I disabled CUDA but kept everything else default.

Detected FAST features do not align with my image. Tellingly, when I rotate my camera, the keypoints move at a speed greater than the camera's rotation.

Here is a video.

    vector<KeyPoint> keypoints_1, keypoints_2;
    FAST(img_1, keypoints_1, 28);
    FAST(img_2, keypoints_2, 28);

    Mat descriptors_1, descriptors_2;
    Ptr<ORB> orb = ORB::create();
    orb->compute( img_1, keypoints_1, descriptors_1 );
    orb->compute( img_2, keypoints_2, descriptors_2 );

    BFMatcher matcher;
    vector<vector<DMatch> > knnMatches;
    matcher.knnMatch(descriptors_1, descriptors_2, knnMatches, 2 );

    vector< DMatch > good_matches;
    for( int i = 0; i < descriptors_1.rows; i++ ) {
      if( knnMatches[i][0].distance / knnMatches[i][1].distance <= 0.9 ) {
          good_matches.push_back( knnMatches[i][0]);
      }
    }

    Mat img_matches;
    drawMatches( img_1, keypoints_1, img_2, keypoints_2,
               good_matches, img_matches, Scalar::all(-1), Scalar::all(-1),
               vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
    imshow( "Matches", img_matches );

Really looking forward to figuring out how I managed to mess this up... thanks everyone.