Opencv DMatch距离超出范围

Opencv DMatch distance out of range

本文关键字：范围 距离 DMatch Opencv      更新时间：2023-10-16

我根据http://opencv.itseez.com/doc/tutorials/features2d/feature_homography/feature_homography.html#feature-单应性。每当它运行这行"double-dist=matches[I].ddistance；"时，我都会得到错误"vector subscript out-of-range"，有人能帮上忙吗？我被困在这里很长一段时间了。。

int minHessian = 400;
  SurfFeatureDetector detector( minHessian );
  std::vector<KeyPoint> keypoints_object, keypoints_scene;
  detector.detect( img_object, keypoints_object );
  detector.detect( img_scene, keypoints_scene );
  //-- Step 2: Calculate descriptors (feature vectors)
  SurfDescriptorExtractor extractor;
  Mat descriptors_object, descriptors_scene;
  extractor.compute( img_object, keypoints_object, descriptors_object );
  extractor.compute( img_scene, keypoints_scene, descriptors_scene );
  //-- Step 3: Matching descriptor vectors using FLANN matcher
  FlannBasedMatcher matcher;
  std::vector< DMatch > matches;
  matcher.match( descriptors_object, descriptors_scene, matches );
  double max_dist = 0; double min_dist = 100;
  //-- Quick calculation of max and min distances between keypoints
  for( int i = 0; i < descriptors_object.rows; i++ )
  { double dist = matches[i].distance;
    if( dist < min_dist ) min_dist = dist;
    if( dist > max_dist ) max_dist = dist;
  }
  printf("-- Max dist : %f n", max_dist );
  printf("-- Min dist : %f n", min_dist );

您想要使用这个：

vector< vector<DMatch> > matches;

这是DMatch的矢量！

也许您无法从图像中获得足够的功能？检查关键点的大小。

如果你从未解决过这个问题，请确保你使用了正确类型的向量——第一个应该是std::vector，而第二个是cv::vector。因此，如果你不使用任何名称空间，它应该是这样的：

std::vector<cv::vector<cv::DMatch>> matches;

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