_keypoints.insert(_keypoints.end(), keypoints.begin(), keypoints.end());
时间: 2024-05-25 13:16:55 浏览: 10
This line of code is used to insert the keypoints from one vector (keypoints) at the end of another vector (_keypoints).
The function used is insert(), which takes three arguments:
1. The position where the insertion should happen, in this case, the end of the _keypoints vector. The end() function returns an iterator pointing to the last element in the vector.
2. The iterator to the beginning of the source vector (keypoints.begin()).
3. The iterator to the end of the source vector (keypoints.end()).
This line of code is useful when we want to concatenate two vectors in C++. In this case, it allows us to add the keypoints detected in a single image to the keypoints detected in previous images, creating a larger dataset for further analysis.
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