Question

我有一个程序可以将模板图像中的特征点与视频源中显示的特征点进行匹配。当我运行程序时，我收到以下错误：

OpenCV Error: Assertion failed (i1 >= 0 && i1 < static_cast<int>(keypoints1.size())) in drawMatches, file bin/opencv-2.4.7/modules/features2d/src/draw.cpp, line 207
terminate called after throwing an instance of 'cv::Exception'
  what():  bin/opencv-2.4.7/modules/features2d/src/draw.cpp:207: error: (-215) i1 >= 0 && i1 < static_cast<int>(keypoints1.size()) in function drawMatches

Aborted

这是上面提到的函数drawMatches：

drawMatches(img_1, templateKeypoints, frames, keypoints_1, good_matches, img_matches, cv::Scalar::all(-1), cv::Scalar::all(-1), std::vector<char>(), cv::DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS);

从我读过的内容来看，我认为问题在于如果视频中找到的要素点与模板图像中的要素点不匹配，那么程序就会中止。

min_dist = 100;      
for(int i = 0; i < img_descriptors_1.rows; i++) {
        if(matches[i].distance <= 3 * min_dist) {
          good_matches.push_back(matches[i]);
        }
      }

我正在寻找即使没有匹配也能持续运行的视频供稿。

编辑：

我注意到如果我反复尝试运行该程序，我有时会收到另一条错误消息：

OpenCV Error: Assertion failed (npoints >= 0 && points2.checkVector(2) == npoints && points1.type() == points2.type()) in findHomography, file /home/colin/bin/opencv-2.4.7/modules/calib3d/src/fundam.cpp, line 1074
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/colin/bin/opencv-2.4.7/modules/calib3d/src/fundam.cpp:1074: error: (-215) npoints >= 0 && points2.checkVector(2) == npoints && points1.type() == points2.type() in function findHomography

Aborted

Answer 1

在以下之后：

extractor.compute(img_1, keypoints_1, descriptors_1);
extractor.compute(frame, keypoints_2, descriptors_2);

请添加：

if ((descriptors_1.empty()) || (descriptors_2.empty()))
continue;

由于在特定帧中没有找到关键点，因此应该转到下一次迭代并检查新帧。这解决了我的问题。

OpenCV - 匹配SURF点运行时错误

1 个答案: