The following is my code.
std::vector<KeyPoint> keypoints_object, keypoints_scene;
detector.detect( img_object, keypoints_object );
detector.detect( img_scene, keypoints_scene );
I'm trying to get the coordinate in the keypoints_object & keypoints_scene to store in another variable. Does someone know how to do it? (PS:My opencv version is 2.4.2)
And if you have matched object keypoints with scene keypoints you do it like this to get the matches coordinates:
match_in_object = keypoints_object[ match[i].trainIdx ].pt;
match_in_scene = keypoints_scene[ match[i].queryIdx ].pt;
One of the fields of KeyPoint object is 'pt', which is the coordinate of this key point. Its type is Point2f. So you can access the coordinates like this:
Point2f p = keypoints_object[i].pt;
Or like this
float x = keypoints_object[i].pt.x;
float y = keypoints_object[i].pt.y;
See here for more information about fields of KeyPoint.
Asked: 2012-09-17 09:34:30 -0600
Seen: 23,013 times
Last updated: Mar 25 '13
